NSString
以@方式生成的字符串，会作为字符串常量，在程序过程中，会一直存在，占用着内存。
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| #define STR(str) [NSString stringWithCString:(str) encoding:NSUTF8StringEncoding]
#define STR(str)[[NSString alloc] initWithUTF8String:str];
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IOS7判断
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| #define IOS7 [[[UIDevice currentDevice]systemVersion] floatValue]>=7.0
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屏幕宽高
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| #define kScreenWidth [[UIScreen mainScreen] bounds].size.width
#define kScreenHeight [[UIScreen mainScreen] bounds].size.height
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颜色
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| //RGB
#define RGBA(R, G, B, A) [UIColor colorWithRed:R/255.0f green:G/255.0f blue:B/255.0f alpha:A]
//（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]
//透明色
#define CLEARCOLOR [UIColor clearColor]
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图片
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| //读取本地图片
#define LOADIMAGE(file,type) [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:file ofType:type]]
//定义UIImage对象
#define IMAGE(A) [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:A ofType:nil]]
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weakSelf
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| #define WS(weakSelf) __weak __typeof(&*self)weakSelf = self;
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重写NSLog,Debug模式下打印日志和当前行数
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| #if DEBUG
#define NSLog(FORMAT, ...) fprintf(stderr,"\nfunction:%s line:%d content:%s\n", __FUNCTION__, __LINE__, [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]);
#else
#define NSLog(FORMAT, ...) nil
#endif
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判断是真机还是模拟器
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| #if TARGET_OS_IPHONE
//iPhone Device
#endif
#if TARGET_IPHONE_SIMULATOR
//iPhone Simulator
#endif
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