UIView的层次结构--code

    [self logViewTreeForMainWindow];

// Recursively travel down the view tree, increasing the indentation level for children

- (void)dumpView:(UIView *)aView atIndent:(int)indent into:(NSMutableString *)outstring

{

    for (int i = 0; i < indent; i++) [outstring appendString:@"--"];

    [outstring appendFormat:@"[%2d] %@\n", indent, [[aView class] description]];

    for (UIView *view in [aView subviews])

        [self dumpView:view atIndent:indent + 1 into:outstring];

}

// Start the tree recursion at level 0 with the root view

- (NSString *) displayViews: (UIView *) aView

{

    

    UIWindow *window = [UIApplication sharedApplication].keyWindow;

    

    NSMutableString *outstring = [[NSMutableString alloc] init];

    [self dumpView: window atIndent:0 into:outstring];

    return outstring;

}

// Show the tree

- (void)logViewTreeForMainWindow

{

    //  CFShow([self displayViews: self.window]);

    UIWindow *window = [UIApplication sharedApplication].keyWindow;

    NSLog(@"The view tree:\n%@", [self displayViews:window]);

}

具体用法就是在你想知道你的view的层次的时候，调用一下这个logViewTreeForMainWindow函数就可以了。

比方说：下面这个就是我的打印结果。非常清晰明了！

[ 0] UIWindow

--[ 1] UILayoutContainerView

----[ 2] UINavigationTransitionView

------[ 3] UIViewControllerWrapperView

--------[ 4] UIView                 -----rootViewController

----------[ 5] UITableView

------------[ 6] ServerViewCell_iphone

--------------[ 7] UITableViewCellContentView

------------[ 6] ServerViewCell_iphone

--------------[ 7] UITableViewCellContentView

----[ 2] UINavigationBar

------[ 3] UINavigationBarBackground

------[ 3] UILabel

------[ 3] UIButton

--------[ 4] UIImageView

--------[ 4] UIImageView

--[ 1] UIView                  ----backView

--[ 1] UITransitionView

----[ 2] UIView                ----CameraPlayerView.

------[ 3] UIView              for zoom.--frameView.

--------[ 4] UIImageView

------[ 3] UIImageView

------[ 3] UILabel

--------[ 4] UIImageView

------[ 3] UIImageView

------[ 3] UINavigationBar

--------[ 4] UINavigationBarBackground

--------[ 4] UINavigationItemView

----[ 2] UILayoutContainerView

------[ 3] UINavigationTransitionView   -----recordVideoView

--------[ 4] UIViewControllerWrapperView

----------[ 5] UIView

------------[ 6] UITableView

--------------[ 7] UIImageView

--------------[ 7] UIImageView

------------[ 6] UIToolbar

--------------[ 7] _UIToolbarBackground

--------------[ 7] UISegmentedControl

------[ 3] UINavigationBar

--------[ 4] UINavigationBarBackground

--------[ 4] UILabel

--------[ 4] UIButton

----------[ 5] UIImageView

----------[ 5] UIButtonLabel