//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;
iOS7 NavigationBar覆盖内容解决
原文：http://www.cnblogs.com/spiderdzl/p/3964649.html
