获取IOS下各种路径

//获取家目录路径的函数：
    NSString *homeDir = NSHomeDirectory();
    ///document
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);//程序主目录
    NSString *documentDic = [paths objectAtIndex:0];
    //cache
    NSArray *paths1 = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *cache = [paths1 objectAtIndex:0];
    //获取tmp目录路径的方法：
    NSString *tmpDir = NSTemporaryDirectory();
    //获取应用程序程序包中资源文件路径的方法：例如获取程序包中一个图片资源（apple.png）路径的方法：
    NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"apple" ofType:@"png"];
    UIImage *appleImage = [[UIImage alloc] initWithContentsOfFile:imagePath];