//判斷設備是否4寸屏幕   #define iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)   //判斷設備是否iOS7   #define IOS7   ( [[[UIDevice currentDevice] systemVersion] compare:@"7.0"] != NSOrderedAscending )     iOS7 NavigationBar覆蓋內容  self.navigationController.navigationBar.translucent = NO; self.tabBarController.tabBar.translucent = NO;