查看当前view tree结构

UIVIew+Tree.h

// Frome http://poolo.iteye.com/blog/1833821
#import <UIKit/UIKit.h>

@interface UIView (Tree)

- (void)logViewTreeForMainWindow;

@end

UIVIew+Tree.m

#import "UIView+Tree.h"

// Frome http://poolo.iteye.com/blog/1833821
@implementation UIView (Tree)

- (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
{
    NSMutableString *outstring = [[NSMutableString alloc] init];
    [self dumpView: self.window atIndent:0 into:outstring];
    return outstring ;
}
// Show the tree
- (void)logViewTreeForMainWindow
{
    //  CFShow([self displayViews: self.window]);
    NSLog(@"The view tree:\n%@", [self displayViews:self.window]);
}

@end