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A Comprehensive Guide to Building An eLearning Platform Like Udemy or Coursera

eLearning Platform Like Udemy or Coursera

It’s critical to have a decent education. Traditional education systems, on the other hand, are becoming increasingly costly these days. The College Board has reported a 3% yearly rise in private and public college tuition fees during the previous two years. This has prompted many people to seek alternatives for high-quality learning via online courses offered by Udemy or Coursera. In response, there has been a trend toward developing eLearning Platform Like Udemy or Coursera that offer low-cost or no-cost high-quality education.

How to Develop An eLearning Platform Like Udemy or Coursera

The ongoing COVID-19 crisis has hugely impacted several industries and has rendered them a standstill. However, e-learning is one of the few industries that have opened brighter avenues for people amidst these challenging times. While people are indoors, they are looking forward to these services. This makes the learning market a lucrative prospect for entrepreneurs and you are right if you are thinking of developing an eLearning site.

Originally, the word ‘learning was first introduced in 1999 at the CBT systems seminar narrating online lessons. Since then, learning evolved into the concept of MOOC (Massive Open Online Courses) gradually, providing people all over the opportunity to study courses at world-class Univer, and eLearning sites and also obtain degrees.

Initially, distance education was free of cost. However, with an increase in the popularity of distance courses as well as the number of renowned universities and teachers joining the MOOC platforms, the payment system was included. The MOOC platforms have so far proven themselves to be quite profitable. Udemy and Coursera are some of the most popular representatives of MOOC providers. By now, there are over 50 MOOC platforms present that are functioning in 23 countries around the globe.

eLearning Growth Outlook

Online learning and education systems are clearly becoming more popular. There’s no denying that the growing need for online training and education systems is driving up. But you must look at the numbers to validate your concept in practice. According to Statista, the worldwide eLearning market will reach $243 billion in 2022.

By 2025, North America alone is forecasted to constitute about 40% of the entire $120 billion eLearning market. Technologies such as AR, VR, Artificial Intelligence, big data, and machine learning are helping with the growth of the eLearning market. All of this makes the idea to develop an eLearning site a brilliant one.

However, establishing an eLearning successful eLearning site like Udemy or Coursera is not a child’s play. It requires thorough and continual efforts to turn your idea into a full-fledged launched marketplace. So, what goes into making a learning platform a successful one? You will get all your answers here.

Types of eLearning Platform Solutions

Types of e-Learning Solutions

Fundamentally, there are two major types of e-Learning solutions which are as described below:

-Synchronous

This is real-time learning where the teacher and the learners are online and interact with each other at the same time from different locations. The delivery and receiving modes of the learning resources are mobile, Internet, video conference, or chat. Here, the participants can interact, share their ideas and get detailed solutions to their queries during the session. This type of e-learning is getting popular all over because of enhanced technology and internet bandwidth capabilities.

Learning from the sources of:

  • Audio and Video Conferencing
  • Chat
  • Virtual Classroom
  • Application Sharing
  • Webinars
  • Instant Messaging

-Asynchronous

This is a pause-and-resume kind of learning where the teacher and the learner cannot be online at the same time. This type of e-learning may use technologies such as blogs, emails, eBook’s CDs, DVDs, discussion forums, etc. Here, learners can learn at any time, download the documents provided to them, and interact with teachers as well as with co-learners. Many learners usually prefer asynchronous learning rather than synchronous because learners can take up online courses at their favorable time without affecting their other daily commitments.

Learning from the sources of:

  • Message boards
  • Self-paced online courses
  • Discussion forums and groups

Udemy and Coursera represent these two types of eLearning platforms. While Coursera majorly cooperates with universities and colleges (Synchronous), Udemy works with individual teachers who upload the content on the platform (Asynchronous).

Key Features to Build an Extensive eLearning Platform like Coursera

The success of your eLearning website is going to be determined largely by its core features. It is thus very important to choose and implement the right features carefully to your website. To develop an online e-learning platform like Udemy or Coursera, you can divide the key features into three main segments – the common features, the student profile features, and the teacher profile features.

Common Features of eLearning Platform

These are the features that will be useful to anyone who is using the website. The common features are going to be used both by the teachers as well as the students on your platform.

-Account Creation

This feature is a must-have feature that will assist the teachers and the students to create their accounts on the website and also to personalize their experience on the platform. This feature would assist the users in managing the various courses that they join and upload, and also assist the students to learn without any obstruction.

-Profile Management

This is the next common feature that you require for your online eLearning platform site. The users who create their profile using the appropriate information would be able to use the profile management feature for managing those details, adding or removing the courses, managing the certificates, and also following the teachers. This feature should be as seamless as possible for easy and smooth navigation.

-Customer Support

Just like any other service, customer support is going to be extremely crucial for your eLearning website. This feature will allow the users to contact customer support whenever they face any issue with the website, their account or to upload a course. 24/7 customer support will enhance the user-friendliness of your website.

-Business Collaboration

Online education websites such as Coursera have benefited a lot from using this particular feature. Big organizations and companies collaborate with online learning sites to introduce their organization-specific courses. This helps them to train their employees in a centralized manner and also track the progress data.

Through this feature, you would be able to work in collaboration and also earn generous revenue as well. If you build your eLearning platform site with popular business organizations, it will also help to increase the popularity of your website.

Student Profile

This will make a better experience for the students who will sign up on your website to learn. Here are some of the crucial student profile features you will require for your website:

-Search, Category, and Filtering

Many courses are available on the website, and students want a feature that will assist them in organizing and selecting the right course for them. A search, categorization, and filtering functionality are required to meet this demand.

The search option will assist users in finding a particular course based on specific keywords. The category feature will sort out the available courses according to a subject, certification type, expertise level, pricing, and other criteria. The filtering option allows students to filter their way through the various categories in order to locate the course they’re looking for.

-Recommendations

This feature will show the users the relevant courses they have already enrolled in. The recommendation feature will help them in discovering more courses to advance their skill set.

-Tag

This is yet another part of discovering new course features. This way the students on your website can follow tags that are relevant to their field. Whenever there are new courses added with that tag, it will be visible to the students on their recommendations page or the homepage.

-Easy Payment Options

There are going to be some paid courses on your website. The user thus will require a secure payment option to pay for these paid courses. The payment option integrated on your website should be easy to handle, and most importantly, a secure one.

Teacher Profile

In order to make your website functional like Coursera, you will require teachers who will upload new courses and content on a regular basis. For this, the teachers would require some crucial profile features. Below are the two most crucial teacher profile features you will require for your eLearning website:

-Course Creation and Updates

This one is the first and most important feature. The teacher should be able to create a course as per their expertise and skills. In addition to this, the feature also lets the teacher update the course with new content.

-Dashboard

This feature includes courses’ updated list, performance, insights, and revenue. The teachers must keep track of the courses that they have uploaded on the profile, the total number of users who have enrolled for their courses, the total revenue amount generated as well as an overall insight of all their activities on the website.

Factors to Consider While Developing an eLearning App Like Coursera

Building a renowned eLearning app like Udemy or Coursera demands a rigorous analysis into the possible factors that can have an influence on the development process as well as the outcome.

Here are a few important factors to consider in eLearning App:

-Optimum UX/UI Design

Do you realize that after an unpleasant experience, 88 percent of users will never return to a website? The design of your eLearning platform has a significant bearing on how long your audience stays. As a result, collaborating with professionals to strategize the complete UX/UI design is critical. It must have the correct balance of simplicity and high performance. Some of the consequences of excellent UX design are as follows: Ensure that your eLearning website provides all of these necessary efficiencies to its consumers.

-Ease of Maintenance

Irrespective of how perfect you get something like the Coursera app from your developers, it will encounter issues in the future. This is not because of any shortcomings in the development process, but this is how everything works. eLearning platforms require regular support and maintenance in order to ensure their seamless and steady functionality.

Usually, all the companies that provide Coursera mobile app development provide constant support and maintenance after the project has been delivered.

-Data Security and Compliance

Can a website ever work well without keeping its data secure? It takes just 3 days for an app to fail. The inefficiency of a platform to secure the personal data of the users can bring the app to an end abruptly without any warning.

This makes it very important for any business to check the PCI-DSS compliance on their very own. Ensure that you have the license to integrate payment gateways. Furthermore, while developing an eLearning application, all the app store rules, and other industry guidelines must be stringently followed.

-Scalability

The eLearning platform that you are getting developed by an app development company must be able to scale up with the future requirements. When you hire an app developer, it is important to ask them about their efficiency on the same. A proficient developer will be able to build a scalable eLearning app that will be able to accommodate their increased traffic as well as workload.

-Changing Requirements

Nothing runs smoothly without regular updates. Every now and then, Coursera adds new and complex features. Over the years, their monetization efforts have gone off without a hitch. Is it possible to do so if you don’t have a strong research and development team in place? It’s critical to integrate new sophisticated capabilities as well as strategies to make your eLearning system more useful for users. As a result, continuing research and development are required in order to progress your eLearning platform.

Technical Stack Required to Build An eLearning Platform

Do you know what goes into the making of a perfect education website like Udemy or Coursera and to launch it? Let’s have a look at the tech stack required to build your own amazing eLearning solution. We will discuss the frameworks, tools, and programming languages used by Udemy and Coursera. This will help you to choose the right technologies for your eLearning site.

Tech Stack Used by Udemy

-Backend

There are several programming languages available to choose from when we talk about the server side. At first, Udemy used PHP in collaboration with a custom MVC framework. However, the company later switched to Python and the process is still incomplete.

As for databases, MySQL is the best choice for Udemy. Additionally, Elasticsearch is an amazing tool for search and analytics.

-Frontend

For Udemy, the core front-end technologies have been JavaScript, HTML5, AngularJS, and CSS3.

-Third-Party Tools and Integrations

To achieve various business goals, Udemy makes use of several applications and tools. These include Slack, Dropbox, Zendesk, Salesforce, and Trello.

Tech Stack Used by Coursera

-Backend

The first lines of the Coursera learning platform were written on PHP, which later shifted to Python and Goes for a short period and finally settled upon Scala in collaboration with the Play framework.

Just like Udemy, Coursera uses MySQL to manage relational databases. Additionally, the company uses Nginx as a web server and Cloud Storage such as Amazon S3.

-Frontend

Coursera uses JavaScript, Bootstrap, and ReactJS as client-side technologies.

-Third-Party Tools and Integrations

Coursera makes use of several collaborations and productivity applications such as Slack, Jira, and G Suite.

All About The Latest Trends in The eLearning Industry

So what are the latest trends in the eLearning industry that we can look forward to in the year 2020? Let’s find out here.

Given a large number of trends, we have categorized them into three main sections:

-Elearning Trends that will help to achieve high-performance gain, learner engagement, and behavioral change

  • Personalized learning
  • Mobile learning
  • Mobile apps for learning
  • Performance support tools
  • Digitization of ILT
  • Social learning
  • Informal learning
  • Self-directed learning

-eLearning Trends that will deliver Impact and Immersive Learning Experiences

  • Microlearning
  • AR/VR and MR or Immersive Learning
  • Gamification
  • Video-based learning
  • Curation and User-Generated Content

-An eLearning Trends that will help to access the impact and maximize ROI

  • Learner Analytics
  • Artificial Intelligence (AI) in Learning
  • Learning Experience Platforms (LXPs)

Wrapping Up:

As eLearning has become a significant part of the education industry, developing a unique and renowned online learning website demands rigorous planning and research. If you wish to stand out among the existing players like Coursera or Udemy, you need to deliver an outstanding experience to your audience.

With more than 12 years of experience in mobile app development for various successful global clients, we carry expertise in strategy implementation, development, and deployment of applications for our esteemed clients. We can transform your vision of building an exceptional eLearning website into reality. Connect with our experts today.

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How COVID-19 Challenges are paving the way for mHealth Innovations?

mhealth

Given the extreme situation the world is facing these days due to the COVID-19 pandemic, governments, many companies, as well as citizen movements, are focusing on developing mHealth initiatives so as to keep the people well informed, while also helping to manage the crisis situation.

Healthcare Industry Outlook in The Times of Coronavirus Pandemic

Today the country’s well-developed health system is forced to deal with the new challenges of a pandemic as serious as Coronavirus. Earlier, the health services were all about individual care. However, now they have to start thinking about public health in the context of an outbreak instead.

Bringing about that sort of change in such a short span of time is challenging for any health service. They are required to change the way they think and act – a complete change of approach, in general. Furthermore, a common factor in times of pandemics is the high number of patients who reach the hospitals all at the same time.

This can have a huge impact on even well-progressed healthcare systems as they are not used to coping with such kinds of numbers on a daily basis. Adapting to all this is not an easy task.

So, the best the healthcare systems do right now is thinking about the different approaches, strategies as well as practices that must be employed when confronting an epidemic like COVID-19.

An early response is the most effective strategy a healthcare must follow in such a time and the key to early response lies in moving beyond centuries-old methods and incorporating advanced strategies that are familiar but are still slow to be adopted in public health. Artificial intelligence, data analytics and smartphone apps today are all making finding and diagnosing people with an infectious disease far more efficient than ever before.

Earlier people who used to develop the typical symptoms of the disease – cough, fever, and shortness of breath, used to physically visit a health care provider or a primary-care doctor. However, that’s the last thing people should do if they are potentially infected with such a highly contagious disease. Rather, the health officials are now pleading with them to connect to a doctor remotely via an app who can triage their symptoms while they are still at their home.

Moreover, clinical brick-and-mortar medicine might be rife with the possibility of virus exposure. Thus, the healthcare industry is urging people to call a telemedicine center and describe their symptoms where the doctors would determine if they require COVID-19 testing without exposing anyone else. Here, comes the significance of mHealth innovations in battling a serious pandemic like Coronavirus.

Growth of mHealth Solutions

– Practicing Medical Distancing:

To fight the coronavirus outbreak, key authorities such as the WHO and CDC have been calling out for ways to diminish any sort of physical contact between healthcare providers and patients, which is known as Medical distancing.

In these efforts to minimize the healthcare-specific transmission of COVID-19, telehealth service is becoming a force these days. The effectiveness of telehealth service has been serving as a promising influence in areas including cardiology, diabetic care, dermatology, etc. This leads to high-quality remote care, while also saving time and physical space.

Although telehealth has proved itself as an amazing measure to support medical distancing, there are still certain obstacles that need to be addressed. There are issues around the characteristics of the patients such as age, educational background, etc., unreliabilities around the legal liabilities, in addition to issues of privacy and confidentiality.

Healthcare app development companies have taken note of such issues and are working to eradicate them.

– Crowdsourced Tracking Apps:

The high occurrence of COVID-19 crises highlights the requirement of tracking the infected on a timely basis as well as their contacts. There are two major and common weaknesses observed in the surveillance systems – Flexibility and timeliness.

Digital health professionals are making it possible to crowdsource disease monitoring through the mode of coronavirus tracing applications. People from across the globe enter their data – travel routes, the prospect of getting infected, etc. for the healthcare experts to track the hotspots as well as the carriers.

– Exchange of Health Information for better interoperability:

Due to the pandemic and the overcrowding of health facilities and patients, a robust health data exchange has become important in the health infrastructure. It has also proved that health data should not just include the medical data of patients, but also a wide data type coming in from the offline and online activity of the individuals.

There will be a lot more HIEs that are going to be observed as well as several portals for the patients and the health departments to access the files.

Market Share of mHealth Solutions

The global mHealth solution market in the present year of 2020 is USD 50.8 billion which is expected to reach USD 213.6 billion by the year 2025, at a high CAGR of 33.3%. Below are some of the factors which play a major role in the increasing demand for mHealth solutions among both patients as well as healthcare professionals:

  • Increasing adoption of smartphones
  • Growing penetration of 3G/4G networks
  • Increasing focus on cost containment in the delivery of healthcare
  • Rising utilization of connected devices and mHealth apps for the management of chronic diseases
  • Increasing focus on patient-centric delivery of healthcare
  • Rising demand for home healthcare services

The mHealth solutions market globally is dominated by North America and will continue to do so during the forecast period of 2020-2025. It is closely followed by Europe, the Asia Pacific, Latin America, and the Middle East and Africa.

5 Ways in Which mHealth is Helping Healthcare Delivery

Combating a pandemic as critical as COVID-19 requires immediate measures and tools that facilitate the delivery of the right treatment in a variety of settings that can smoothly diagnose the cases of coronavirus infection. Digital tools like telehealth, robots, cloud computing, and AI-based chatbots are playing a major role in limiting the outbreak of the virus.

As China commenced its response to the deadly virus, it inclined towards its technological domain, AI (artificial intelligence), data science so as to effectively track and fight the pandemic. Here are some of the ways in which mHealth is tracking and battling the coronavirus pandemic.

– Use of Telemedicine

The use of telemedicine is making headway as a sustainable solution for the treatment and subsequent prevention of COVID-19. It allows patients to stay at their home and seek medical help virtually from physicians and decrease the spread of the virus. Health services are being encouraged to make use of telemedicine technologies and self-assessment tools so as to provide remote care for patients who do not have urgent medical help.

A number of telemedicine technology companies are expanding their use of telehealth solutions to examine, diagnose and treat patients remotely at home while also providing them with professional guidance, and clinical data and reducing any kind of physical contact so as to avoid the spread of the virus.

– Contact Tracing Apps

Smartphones today are playing a crucial role in monitoring the health of a patient. Apps have been built to monitor the people infected with coronavirus and aimed at tracking the registered individuals with the help of their phone’s GPS.

It allows people to record their movements and match them up to those of known patients with COVID-19, with the help of filtered data given through national departments of public health. Furthermore, the users will also be interrogated about if they are infected, providing an effective way to identify any potential transmission.

Additionally, Apple has also launched an application, Apple COVID-19 to help in screening users. It provides an online screening tool with some guidance on when to opt for the testing of COVID-19. The users will also get answers to their frequently asked queries regarding COVID-19 on this app.

– Use of Drones and Robots For Contactless Delivery

When it comes to providing valuable goods to people who buy online and are quarantined at home, Robots and drones prove to be quite beneficial. These are immune to infection and help in delivering food and supplies. Robots can be used for distribution of drugs and food, disinfection, and assessment of vital signs.

Many tech companies are stepping out to get more robots in force so as to deliver medical supplies within healthcare environments. Drones are also being used to carry out contactless disinfection of areas and spray disinfectants on a large scale.

Drones through thermal sensing, are also assisting crowd control officials and realizing people with elevated body temperatures indicate the potential of infection with the virus.

– AI to Identify, Track, and Diagnose Outbreaks

Expeditious mHealth innovations that include new applications of AI (artificial intelligence) and ML (machine learning) to screen people and assess risks of infection have made AI a significant contributor to recognizing, tracking and diagnosing outbreaks.

Additionally, technology like NLP (Natural Language Processing), ML (Machine Learning) and location monitoring can diagnose the potential places where the outbreak has the possibility to take place.

AI can also combine population, travel, and disease data so as to predict where and how rapidly the infection might spread. Healthcare organizations and governments are making use of this information so as to respond to the disease quickly. This also helps to make better treatment decisions as per medical imaging.

AI can also assist in uncovering new viruses by examining data from any similar kind of viral disease and then using the data to track the types of medicines and vaccines that would be most effective. For instance, data from the chest X-rays of coronavirus patients can serve as the guidance for AI models, so that doctors can provide diagnoses more rapidly.

– Wearables For Remote Monitoring

COVID-19 has taken all of us by surprise and early detection is the absolute key to monitoring the spread of the disease and eventually improving the survival rates.

The popular wearable health devices, such as Garmins and Fitbits, are quite effective in monitoring a range of physical parameters such as body temperature, heart rate, sleep, movement, blood pressure, and oxygen saturation levels. They generate a distinct lack of actionable information. When this data is combined and cross-checked, it gives a more compatible profile of the overall health. It continuously examines and analyzes coughing and respiratory activity in ways that are not possible with traditional monitoring systems.

mHealth in The Post-Coronavirus World

The Post-Coronavirus world is going to be remembered as when medical communications such as the management of several non-communicable diseases or provision to primary care transferred by default to digital mode, as opposed to exceptions. The impact of COVID-19 is going to be huge on the global digital health industry, with the acceptance of digital health as the new normal.

The new world after the pandemic will also likely empower other technologies such as AI, IoT, 5G, video conferencing etc. to help us all connect in an entirely new variety of approaches. We are already witnessing all this happening in real-time in this global pandemic and in a never-imaginable pace.

Primary care has now finally started to embrace telehealth and has been delivering a digital approach so as to manage streaming care to the appropriate places.

Although, there’s a lot still left to be done. There is a dire need for the incorporation of strong governance in the deployment of all these approaches. There should also be strong clinic decision support within the deployments as a rule in place of exceptions.

The next significant modification which can be seen promoting is the adoption of precision health, both in personalized as well as predictive health setup. We will witness the use of digital technology in making people empowered to self-manage themselves.

Furthermore, we need to understand that this new world of medical infrastructure is going to be quite different from the healthcare world that we are used to. It would need us to remain open as well as adaptive. The one thing which is for sure is that the mHealth world is going to change for the good!

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Lazy Loading in iOS

Lazy Loading in iOS

What is lazy loading:

The phrase “lazy loading” is used to describe the act of downloading pictures in layman’s terms. As a result, the software does not become unresponsive as images are downloaded.

However, from a technological standpoint, it is the ability to define the default procedures that are compiled and loaded into memory when a program is launched. Lazy loading is designed to speed up the startup time of an application by eliminating unused capabilities.

Lazy loading is also known as “dynamic function loading”.

 The challenge of loading images remotely :

If the page requires a large number of static images, this will have little impact on an application’s performance since those pictures are kept locally on the device. When we need to load photos remotely, however, there is a danger that they won’t load appropriately and that the user will become irritated while waiting for them to appear.

 Lazy loading can help :

Lazy loading offers a quick solution for remote loading of images and helps you to provide better performance to the user. When you use it, the images are loaded in an asynchronous manner. What this can do is show some default images to the user and load the images remotely. This will not negatively affect the performance of the app.

 What it adds :

  1. The ability to load a picture from the internet asynchronously (so you can start several loads at once while performing other tasks).
  2. The picture caching feature can be set to Off if you don’t want your servers to be charged for too many requests from the same client for the same photos.
  3. A customizable default image will be displayed as the distant image loads.

 How it works :

The user will be able to see the information rather than having to wait for the pictures to load with a lazy loading design in place. It may be used on various platforms, but I’ll explain how it works in iOS in this post.

It’s possible to use a library or not to use one. So I’ll start with the first option, which is a simple and easy approach to implement lazy image loading in the table view.

Advantages of using a library:

  • Only a few lines are needed to perform this functionality.
  • Code will be managed and making changes in code will be easy.
  • Images will be displayed in visible rows automatically without delay means “Performances”.
  • An asynchronous image downloader
  • An asynchronous memory + disk image caching with automatic cache expiration handling
  • Animated GIF support
  • WebP format support
  • A background image decompression
  • A guarantee that the same URL won’t be downloaded several times
  • A guarantee that bogus URLs won’t be retried again and again
  • A guarantee that the main thread will never be blocked
  • Use GCD and ARC
  • Arm64 support

To implement lazy loading using a third-party library, you need to follow certain steps:

lazy loading using a third-party library

  • Download the SDWebImage library from the link.
  • To integrate this library into your project, make a folder (named LIB) in the application bundle and go to File Inspector. Select the folder image that says “none” from the drop-down menu. “Select your application from the xcode window, then click “New Folder” and give it the same name (called LIB) as you did in the bundle (do not use lowercase letters). After that, open Finder and select “Show in Finder” from right-click menu on the folder (named LIB) inside the app package. The steps above will move you to the folder present in Finder. Paste your library from downloads into the Finder folder. Drag and drop the library from the Finder folder onto the application bundle directory (note: don’t choose copy). This will add the library to your codebase. If you do not follow these procedures, you need not be concerned; you may use any approach to add an external library to your codebase.

Programming Part:

#import <SDWebImage/UIImageView+WebCache.h>      //1
...
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{...
// Here we use the new provided setImageWithURL: method to load the web image
[cell.imageView setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"]
placeholderImage:[UIImage imageNamed:@"placeholder.png"]]; //2
...
return cell;
}

By adding the above changes to your code, you will really see great performance from the application and your users will not feel frustrated. This works really well for most of the apps where we deal with images loading remotely.

As you can see only two lines of code make a great difference while loading images remotely. These are described below :

  • Import <SDWebImage/UIImageView+WebCache.h> in your file.
  • Use the “setImageWithURL” method that performs two functionalities it downloads images from URL and during the time interval it shows the default image. If any case image is not able to download due to any issue it shows the default image in ImageView instead of blank ImageView.

Closure

It is feasible to write customized code if you do not wish to utilize an external library, but keep in mind that we have a limit on the number of pictures that may be downloaded remotely each time. Consider that you have 1,000 photographs to download but that you are limited to a certain number (for example, 10 or other) so that it may only grab 10 images at once instead of 1000. It’s possible that the table view has visible rows. To know how to download images asynchronously using a number limit you can refer to 

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Happy Coding!