iOS开发中宏判断&宏方法

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();