Question

我正在尝试使用以下代码段创建自定义目录，我实际上是从同一应用程序的工作Obj-C代码翻译而来。

class func pathToConfigFolder() -> String {
    let urls: [String] = NSSearchPathForDirectoriesInDomains(.LibraryDirectory, .UserDomainMask, true)
    let libraryPath: String = urls.last!
    let configFolder: String = NSURL(fileURLWithPath: libraryPath).URLByAppendingPathComponent(".conf").absoluteString

    var directory: ObjCBool = ObjCBool(true)
    if !NSFileManager.defaultManager().fileExistsAtPath(configFolder, isDirectory: &directory) {
        do {
            try NSFileManager.defaultManager().createDirectoryAtPath(configFolder, withIntermediateDirectories: false, attributes: nil)
        } catch let error {
            print(" Error thrown... \(error)")
        }
    }
    return configFolder
}

但代码失败并出现以下错误。

Error thrown... Error Domain=NSCocoaErrorDomain Code=4 "The operation couldn’t be completed. (Cocoa error 4.)" UserInfo=0x17526f4c0 {NSFilePath=file:///var/mobile/Containers/Data/Application/44D90AEB-DD7A-4C8C-9AD0-2665147BAAEC/Library/conf, NSUnderlyingError=0x174054c40 "The operation couldn’t be completed. No such file or directory"}

我在设备和运行iOS 9的模拟器上都试过了。

修改 Objective-C代码

+ (NSString*) pathToConfigFolder
{
    NSArray *urls = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,
                                                        NSUserDomainMask, YES);
    NSString *libraryPath = [urls lastObject];

    NSString *configFolder = [libraryPath stringByAppendingPathComponent:@".conf"];

    NSError *error = nil;

    if ( ! [[NSFileManager defaultManager] fileExistsAtPath:configFolder]) {

        [[NSFileManager defaultManager] createDirectoryAtPath:configFolder
                                  withIntermediateDirectories:NO
                                                   attributes:nil
                                                        error:&error];
    }
    return configFolder;
}

Answer 1

你的问题在这里：

let libraryPath: String = urls.last!
let configFolder: String = NSURL(fileURLWithPath: libraryPath).URLByAppendingPathComponent(".conf").absoluteString

absoluteString方法将整个网址作为字符串返回，因此configFolder为file:///var/mobile/Containers/Data/Application/44D90AEB-DD7A-4C8C-9AD0-2665147BAAEC/Library/conf。也就是说，它包含 file://，因此不适合与您使用它的NSFileManager方法一起使用的有效文件路径。

将这些行更改为这样可以解决问题：

let libraryPath: NSString = urls.last!
let configFolder = libraryPath.stringByAppendingPathComponent(".conf")

我在这里使用NSString因为那里定义了stringByAppendingPathComponent。

在iOS Swift 2.2中创建自定义目录

1 个答案: