ios获取Document文件夹路径

NSFileManager *fileManager = [NSFileManager defaultManager];  
    NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,                                                                          NSUserDomainMask, YES);  
    NSString *documentsDirectory = [paths objectAtIndex:0];  
    NSString *filePath2 = [documentsDirectory stringByAppendingPathComponent:@"Screenshot.png"];