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copied!<p>Move web service call to <code>viewWillAppear</code> or <code>viewDidAppear</code>, so call will initiate after controller view appears on screen. </p> <p>Ideally you should perform the web service call in the background i.e. not on the main thread. Use <a href="https://developer.apple.com/library/ios/DOCUMENTATION/Cocoa/Reference/NSOperation_class/Reference/Reference.html#//apple_ref/doc/uid/TP40004591" rel="nofollow"><code>NSOperation</code></a> and <a href="https://developer.apple.com/library/ios/DOCUMENTATION/Cocoa/Reference/NSOperationQueue_class/Reference/Reference.html" rel="nofollow"><code>NSOperationQueue</code></a> or <a href="https://github.com/AFNetworking/AFNetworking" rel="nofollow"><code>AFNetworking</code></a> or <a href="https://developer.apple.com/library/ios/documentation/Performance/Reference/GCD_libdispatch_Ref/Reference/reference.html" rel="nofollow">Grand Central Dispatch</a>. You can then initiate the call in <code>viewDidLoad</code> itself.</p> <p>Here are a few links that can get you started.</p> <ol> <li><a href="http://www.raywenderlich.com/19788/how-to-use-nsoperations-and-nsoperationqueues" rel="nofollow">How To Use NSOperations and NSOperationQueues</a></li> <li><a href="http://mobile.tutsplus.com/tutorials/iphone/ios-sdk_afnetworking/" rel="nofollow">Networking Made Easy With AFNetworking</a></li> <li><a href="http://mobile.tutsplus.com/tutorials/iphone/ios-quick-tip-interacting-with-web-services/" rel="nofollow">iOS Quick Tip: Interacting with Web Services</a> - for using GCD</li> </ol> <p>Hope that helps!</p>

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