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Objective-C常用的宏定义

2016-03-08 10:02 387 查看

首先宏定义学习传送门：宏定义的黑魔法 - 宏菜鸟起飞手册

然后介绍一些开发中常用到的宏定义，个人总结，欢迎补充：

快速weak：

#define WEAKOBJ(weakObj)  __weak __typeof(&*weakObj)weak_##weakObj = weakObj;
#define WEAKSELF(weakSelf)  __weak __typeof(&*self)weakSelf = self;

颜色：

#define UIColorFromRGBA(rgbValue, alphaValue) \
[UIColor \
colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \
green:((float)((rgbValue & 0x00FF00) >> 8))/255.0 \
blue:((float)(rgbValue & 0x0000FF))/255.0 \
alpha:alphaValue]

屏幕宽高：

#define SCREEN_WIDTH                    ([UIScreen mainScreen].bounds.size.width)
#define SCREEN_HEIGHT                   ([UIScreen mainScreen].bounds.size.height)

系统版本：

#define CURRENT_IOS_VERISON [[[UIDevice currentDevice] systemVersion] floatValue]
#define NAVIGATIONBAR_HEIGHT (CURRENT_IOS_VERISON >= 7 ? 64.0f:44.0f)

#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)

#define IS_OS_5_OR_LATER                            SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"5.0")
#define IS_OS_6_OR_LATER                            SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"6.0")
#define IS_OS_7_OR_LATER                            SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")

图片：

//读取本地图片
#define LOADIMAGE(file,ext) [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:file ofType:ext]]
//定义UIImage对象
#define IMAGE(A) [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:A ofType:nil]]
//定义UIImage对象
#define ImageNamed(_pointer) [UIImage imageNamed:_pointer]
//可拉伸的图片
#define ResizableImage(name,top,left,bottom,right) [[UIImage imageNamed:name] resizableImageWithCapInsets:UIEdgeInsetsMake(top,left,bottom,right)]
#define ResizableImageWithMode(name,top,left,bottom,right,mode) [[UIImage imageNamed:name] resizableImageWithCapInsets:UIEdgeInsetsMake(top,left,bottom,right) resizingMode:mode]

当前语言：

#define CurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])

字符串拼接：

#define GETSTRING_WITH(x,y) [NSString stringWithFormat:@"%@%@",x,y]

TODO:

/// 转成字符串
#define STRINGIFY(S) #S
// 需要解两次才解开的宏
#define DEFER_STRINGIFY(S) STRINGIFY(S)
#define PRAGMA_MESSAGE(MSG) _Pragma(STRINGIFY(message(MSG)))

// 为warning增加更多信息
#define FORMATTED_MESSAGE(MSG) "[TODO-" DEFER_STRINGIFY(__COUNTER__) "] " MSG " \n" DEFER_STRINGIFY(__FILE__) " line " DEFER_STRINGIFY(__LINE__)
// 使宏前面可以加@
#define KEYWORDIFY try {} @catch (...) {}
// 最终使用的宏
#define TODO(MSG) KEYWORDIFY PRAGMA_MESSAGE(FORMATTED_MESSAGE(MSG))

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