- (void)viewDidAppear:(BOOL)animated

{

[superviewDidAppear:animated];

NSLog(@"修改前");

[self printViewHierarchy:self.navigationController.navigationBar];

//修改NavigaionBar的高度

self.navigationController.navigationBar.frame=CGRectMake(0, 20, 320, 100);

NSLog(@"\n修改后");

[selfprintViewHierarchy:self.navigationController.navigationBar];

}

- (void)printViewHierarchy:(UIView*)superView

{

staticuintlevel = 0;

for(uinti = 0; i < level; i++){

printf("\t");

}

constchar*className =NSStringFromClass([superViewclass]).UTF8String;

constchar*frame =NSStringFromCGRect(superView.frame).UTF8String;

printf("%s:%s\n", className, frame);

++level;

for(UIView*viewinsuperView.subviews){

[selfprintViewHierarchy:view];

}

--level;

}