1.debug模式和release模式的NSLog打印
#ifdef DEBUG
#define LRLog(...) NSLog(@"%s 第%d行 \n %@\n\n",__func__,__LINE__,[NSString stringWithFormat:__VA_ARGS__])
#else
#define LRLog(...)#endif
2.弱引用/强引用
#define YSWeakSelf(type) __weak typeof(type) weak##type = type;
#define YSStrongSelf(type) __strong typeof(type) type = weak##type;
3.判断真机还是模拟器
#if TARGET_OS_IPHONE //iPhone Device
#endif
#if TARGET_IPHONE_SIMULATOR //iPhone Simulator
#endif
4.沙盒目录文件
//获取temp
#define kPathTemp NSTemporaryDirectory()
//获取沙盒 Document#define kPathDocument
[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]
//获取沙盒 Cache#define kPathCache
[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]
