如何检查Cocoa和Objective-C中是否存在文件夹？

import Foundation

// 创建一个具有根路径的URL对象
let directoryURL: URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!

// 检查根目录下是否存在一个名为"folderName"的文件夹
if FileManager.default.fileExists(atPath: directoryURL.absoluteString + "/" + "folderName") {
    print("文件夹存在")
} else {
    print("文件夹不存在")
}

#import<Foundation/Foundation.h>

NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSURL *documentsDirectoryURL = [fileManager urlsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask appropriateForURL:nil create:YES error:&error];
NSURL *directoryURL = [documentsDirectoryURL URLByAppendingPathComponent:@"folderName"];
BOOL isExists = [fileManager fileExistsAtPath:[directoryURL absoluteString]];
    
if (isExists) {
    NSLog(@"文件夹存在");
} else {
    NSLog(@"文件夹不存在");
}