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    <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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    1. POCalling web service in viewDidLoad resulting in screen Hang iOS
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    1. USAmar
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    1. COno can't move webservice in viewWillAppear beacuse view will appear call every times so it;s not better solution .
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      1. USJitendra
    2. CO@JitendraDeore A simple flag can ensure that it does not get called every time. I have also suggested with better approach.
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      1. USAmar
    3. COk Amar so webservice get called only once. thats correct now and check out my solution i am also providing better approch for him.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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