iOS 判断iphone ipad 系统版本

转自： http://my.oschina.net/qianglong/blog/330163

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#define ScreenWidth  ([[UIScreen mainScreen] bounds].size.width)

#define ScreenHeight ([[UIScreen mainScreen] bounds].size.height)

 

#define iOS8 ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)

#define iOS7 ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)

#define iOS6 ([[[UIDevice currentDevice] systemVersion] floatValue] >= 6.0)

 

#define isPad   (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad   ? YES : NO)

#define isPhone (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone ? YES : NO)

#define isRetina ([[UIScreen mainScreen] scale] > 1 ? YES : NO)