iOS 快速獲取沙盒下任意文件夾的路徑

    NSLog(@"%@", NSHomeDirectory());//沙盒主目錄
    NSLog(@"%@", NSTemporaryDirectory());//沙盒中tmp文件夾的路徑
    NSLog(@"%@", [[NSBundle mainBundle] bundlePath]);//沙盒中*.app包的路徑
    NSLog(@"%@", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]);//沙盒中document文件夾的路徑