iOS开发中宏判断&宏方法&各目录路径获取

1. 判断是否是iPad 
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) 

2. iOS版本判断 
#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_5_1 
    [navigationController.navigationBar addSubview:imageView]; 
#else 
    [navigationController.navigationBar insertSubview:imageView atIndex:0]; 
#endif 

3. 自定log 调试用 
#define showLogInfo 1 
#if showLogInfo 
#    define DLog(...) NSLog(__VA_ARGS__) 
#else 
#    define DLog(...) 
#endif 

4. 各目录路径获取 

 // 获取沙盒主目录路径
 NSString *homeDir = NSHomeDirectory();

 // 获取Documents目录路径
 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *docDir = [paths objectAtIndex:0];

 // 获取Caches目录路径
 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
 NSString *cachesDir = [paths objectAtIndex:0];

 // 获取tmp目录路径
 NSString *tmpDir =  NSTemporaryDirectory();