标签：
宏定义在很多语言里面都可以看到它的影子，C# ，C++，C等，尤其是系统API里面很多宏定义，看着很唬人。合理的利用宏定义，可以让自己的代码看着更规范，更方便，尤其在特定的某些地方。使用宏定义还可以让自己的代码看着高大上有木有！
本文改引自http://www.cnblogs.com/ios8/p/ios-hong.html
网上对IOS的宏定义比较多，我总结了一些最常用的宏，后续还会继续补上。
1.首次启动判断：
#define First_Launched @"firstLaunch"
2.ios7系统判断：
#define IsIOS7 ([[[UIDevice currentDevice] systemVersion] floatValue] >=7.0 ? YES : NO)
3.判断是否Retina屏、是否IPhone5、是否IPad
#define isRetina ([UIScreen instancesRespondToSelector:
@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960),
[[UIScreen mainScreen] currentMode].size) : NO)
#define iPhone5 ([UIScreen instancesRespondToSelector:
@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136),
[[UIScreen mainScreen] currentMode].size) : NO)
#define isPad (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
4.加载图片宏：
#define LOADIMAGE(file,type) [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:file ofType:type]]
5.rgb颜色转换（16进制->10进制）
#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
6.设置颜色RGB
#define COLOR(R, G, B, A)
[UIColor colorWithRed:R/255.0 green:G/255.0 blue:B/255.0 alpha:A]
7.去除"-(id)performSelector:(SEL)aSelector withObject:(id)object;"的警告
#define SuppressPerformSelectorLeakWarning(Stuff) \
do { \
_Pragma("clang diagnostic push") \
_Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"") \
Stuff; \
_Pragma("clang diagnostic pop") \
} while (0)
8.圆周运动时角度与弧度的转换。
9.获取屏幕 宽度、高度
#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)//----------------------系统----------------------------// 是否iPad#define isPad (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)// 是否iPad#define someThing (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)? ipad: iphone//获取系统版本#define IOS_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]#define CurrentSystemVersion [[UIDevice currentDevice] systemVersion]//获取当前语言#define CurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])//判断是否 Retina屏、设备是否%fhone 5、是否是iPad#define isRetina ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)#define iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)#define isPad (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)//判断设备的操做系统是不是ios7#define IOS7 ([[[UIDevice currentDevice].systemVersion doubleValue] >= 7.0]//判断当前设备是不是iphone5#define kScreenIphone5 (([[UIScreen mainScreen] bounds].size.height)>=568)//获取当前屏幕的高度#define kMainScreenHeight ([UIScreen mainScreen].applicationFrame.size.height)//获取当前屏幕的宽度#define kMainScreenWidth ([UIScreen mainScreen].applicationFrame.size.width)//定义一个define函数#define TT_RELEASE_CF_SAFELY(__REF) { if (nil != (__REF)) { CFRelease(__REF); __REF = nil; } }//判断是真机还是模拟器#if TARGET_OS_IPHONE//iPhone Device#endif#if TARGET_IPHONE_SIMULATOR//iPhone Simulator#endif//检查系统版本#define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)#define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)标签：
原文地址：http://www.cnblogs.com/lvchenhao/p/4234785.html
