iOS7 NavigationBar覆盖内容解决

//判断设备是否4寸屏幕

#define iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640,1136), [[UIScreen mainScreen] currentMode].size) : NO)

//判断设备是否iOS7

#define IOS7   ( [[[UIDevice currentDevice] systemVersion] compare:@"7.0"] != NSOrderedAscending )

iOS7 NavigationBar覆盖内容

 self.navigationController.navigationBar.translucent = NO;

self.tabBarController.tabBar.translucent = NO;