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这是一个有用的例程，您可以在 iOS 应用程序中使用它来遍历视图层次结构，当您想知道正在创建什么以及它要去哪里时。

此例程将视图层次结构转储到NSLog()从传入的视图开始。子视图在 subviews 数组和所有超类中按顺序显示它们的索引，以冒号分隔，最后是帧大小。

要转储应用程序的整个视图层次结构，请调用如下方法：

dumpViews([[UIApplication sharedApplication] keyWindow], @"", @"");

要显示相机视图的层次结构，请在控制器中覆盖此方法：navigationController:willShowViewController:viewController:animated:

并像这样调用转储例程：

dumpViews(self.modalViewController.view, @"", @"");

对于所有其他视图：

dumpViews(myView, @"", @"");


资源

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 < [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];
    }
}




示例相机转储

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}}
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