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POTraversing the View Hierarchy on the iPhone
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  1. POTraversing the View Hierarchy on the iPhone
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    copied!<p>Here is a helpful routine you can use on the iPhone to traverse the view hierarchy when you want to know what's being created and where it's going. </p> <p>This routine dumps the view hierarchy to NSLog starting at the view passed in. Subviews show their index in the subviews array and all super classes in order separated by a colon with the frame size at the end. </p> <p>To dump the entire view hierarchy of your application, call the method like this:</p> <pre><code>dumpViews([[UIApplication sharedApplication] keyWindow], @"", @""); </code></pre> <p>To display the hierarchy of the the camera view, override this method in your controller:</p> <pre><code>navigationController:willShowViewController:viewController:animated </code></pre> <p>and call the dump routine like this:</p> <pre><code>dumpViews(self.modalViewController.view, @"", @""); </code></pre> <p>For all other views:</p> <pre><code>dumpViews(myView, @"", @""); </code></pre> <p><br /> </p> <h2>Source</h2> <pre><code>void dumpViews(UIView* view, NSString *text, NSString *indent) { Class cl = [view class]; NSString *classDescription = [cl description]; while ([cl superclass]) { cl = [cl superclass]; classDescription = [classDescription stringByAppendingFormat:@":%@", [cl description]]; } if ([text compare:@""] == NSOrderedSame) NSLog(@"%@ %@", classDescription, NSStringFromCGRect(view.frame)); else NSLog(@"%@ %@ %@", text, classDescription, NSStringFromCGRect(view.frame)); for (NSUInteger i = 0; i &lt; [view.subviews count]; i++) { UIView *subView = [view.subviews objectAtIndex:i]; NSString *newIndent = [[NSString alloc] initWithFormat:@" %@", indent]; NSString *msg = [[NSString alloc] initWithFormat:@"%@%d:", newIndent, i]; dumpViews(subView, msg, newIndent); [msg release]; [newIndent release]; } } </code></pre> <p><br /><br> <br /> </p> <h2>Example Camera Dump</h2> <pre> UIView:UIResponder:NSObject {{0, 0}, {320, 480}} 0: PLCameraView:UIView:UIResponder:NSObject {{0, 0}, {320, 480}} 0: UIView:UIResponder:NSObject {{0, 0}, {320, 427}} 1: UIImageView:UIView:UIResponder:NSObject {{10000, 10000}, {320, 480}} 2: UIView:UIResponder:NSObject {{0, 427}, {320, 53}} 3: PLCropOverlay:UIView:UIResponder:NSObject {{0, 0}, {320, 480}} 0: UIImageView:UIView:UIResponder:NSObject {{0, 20}, {320, 96}} 1: PLCropLCDLayer:UIView:UIResponder:NSObject {{0, 20}, {320, 96}} 2: TPBottomDualButtonBar:TPBottomButtonBar:TPBottomBar:UIView:UIResponder:NSObject {{0, 384}, {320, 96}} 0: TPPushButton:UIThreePartButton:UIPushButton:UIControl:UIView:UIResponder:NSObject {{22, 26}, {128, 47}} 1: TPCameraPushButton:TPPushButton:UIThreePartButton:UIPushButton:UIControl:UIView:UIResponder:NSObject {{170, 26}, {128, 47}} 0: UIImageView:UIView:UIResponder:NSObject {{51, 12}, {26, 19}} </pre>
 

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