遍历iPhone或iPad上的视图层次结构

Question

这是一个有用的例程,当您想知道正在创建的内容以及它的位置时,您可以在iOS应用程序中使用该例程来遍历视图层次结构.

此例程将视图层次结构转储到NSLog()从传入的视图开始.子视图在子视图数组中显示它们的索引,所有超类按顺序用冒号分隔,最后是帧大小.

要转储应用程序的整个视图层次结构,请调用以下方法:

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

要显示摄像机视图的层次结构,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, @"", @"");

对于所有其他观点:

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}}