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POhow does one make a subview firstResponder
 

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  1. POhow does one make a subview firstResponder
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    <p>i am trying to get a subview to become firstResponder. my understanding is that this is done in its viewDidAppear method, like so:</p> <pre><code>- (void)viewDidAppear { [self becomeFirstResponder]; } </code></pre> <p>while overriding canBecomeFirstResponder to return YES:</p> <pre><code>- (BOOL)canBecomeFirstResponder { return YES; } </code></pre> <p>however, when i insert the subview in its parent view's viewDidLoad method:</p> <pre><code>- (void)viewDidLoad { subViewController = [[SubViewController alloc] init]; [self.view insertSubview: subViewController.view atIndex: 0]; [subViewController viewDidAppear: NO]; [super viewDidLoad]; </code></pre> <p>}</p> <p>(i call viewDidAppear manually, because it does not get triggered automatically), the subview does not become firstResponder.</p> <p>why does the subview not become firstResponder? and how can i make it firstResponder?</p> <p>thanks,</p> <p>mbotta</p> <p>btw, this is a rewrite of my original question:</p> <p>i am trying to build an iphone app where a rootviewcontroller object manages two subviews, one of which should react to a user shaking his iphone.</p> <p>after some digging, i concluded the subview must be made firstResponder in its view controller's viewDidAppear method. moreover, the canBecomeFirstResponder method should be modified to return YES.</p> <p>so here's what happens: i instantiate the rootviewcontroller in the app delegate. in its viewDidLoad method, i tell it to addSubView firstViewController. all of this works just beautifully.</p> <p>however, firstViewController does not react to any shaking. i sprinkled some NSLogs around and found that while we DO tell firstViewController in canBecomeFirstResponder to return YES, and while we DO tell it to [self becomeFirstResponder] in viewDidAppear, in actual fact, it is <em>not</em> the firstResponder.</p> <p>so, my questions are: 1) does a subview actually need to be firstResponder in order to react to shaking? a) if not, how does one make a subview react without being firstResponder? 2) how does one make a subview firstResponder?</p> <p>what makes this interesting is that if i perform the same sequence (canBecomeFirstResponder, [self firstResponder], motionBegan:) in a different project with only one view controller, it all works flawlessly. clearly, i must be hitting a design flaw of my own making.</p> <p>thanks,</p> <p>mbotta</p>
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