随笔-IOS 在IOS6中设置navigationBar背景图片 会有一条 黑色阴影 --- 解决方案

//给navigationBar设置背景图片          if ([self.navigationController.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)]) {              [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"nav_bg.png"]   forBarMetrics:UIBarMetricsDefault];          }          self.navigationController.navigationBar.layer.contents = (id)[UIImage imageNamed:@"nav_bg.png"].CGImage;            解决方案 1：            [self.navigationController.navigationBar.layer setMasksToBounds:YES];       // 剪切掉多余的背景    解决方案 2：    self.navigationController.navigationBar.clipsToBounds = YES;    解决方案 3：    CustomNavBar *navBar = (CustomNavBar *)self.navigationController.navigationBar;          [navBar setBackgroundImage:[UIImage imageNamed:@"navigation_bar_gray.png"] forBarMetrics:UIBarMetricsDefault];          navBar.shadowImage = [[UIImage alloc]init]; // this is what acctually removed the shadow under navigation bar