Question

I believe something has changed within Swift 2, because no tutorials on how to read and write to property lists seem to be working.

Can anyone whose developing for iOS 9 share their method of R/W to Plists using Swift 2 on Xcode 7?

Answer 1

这适用于iOS 9和Xcode 7：

let filePath = NSBundle.mainBundle().pathForResource("FileName", ofType: "plist")!    
let stylesheet = NSDictionary(contentsOfFile:filePath)

唯一的结果是NSDictionary而不是Dictionary。

Answer 2

希望这很有用 - 没有代码就很难回答。

让我失望的变化是，当将plist文件复制到文档目录时，方法stringByAppendingPathComponent不再可用。你必须使用NSURL。

如果你有一个preparePlistForUseMethod，它现在应该是这样的。

let rootPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, .UserDomainMask, true)[0]
        let url = NSURL(string: rootPath)
        plistPathInDocument = (url?.URLByAppendingPathComponent("plistfilename.plst").absoluteString)!

if !NSFileManager.defaultManager().fileExistsAtPath(plistPathInDocument){
            let plistPathInBundle = NSBundle.mainBundle().pathForResource("plistfilename.plst", ofType: "plist")!

            do{
            try NSFileManager.defaultManager().copyItemAtPath(plistPathInBundle, toPath: plistPathInDocument)
                print("plist copied")
            }
            catch{
                print("error copying plist!")
            }
        }
        else{
            print("plst exists \(plistPathInDocument)")
    }
}

Answer 3

为了在PLIST上阅读，我将逻辑封装在Singleton中。就我而言，我想阅读文件URLs.plist。

    /// <summary>
    /// Parses a continuous hex stream from a string.
    /// </summary>
    public static byte[] ParseHexBytes(this string s)
    {
        if (s == null)
            throw new ArgumentNullException("s");

        if (s.Length == 0)
            return new byte[0];

        if (s.Length % 2 != 0)
            throw new ArgumentException("Source length error", "s");

        int length = s.Length >> 1;
        byte[] result = new byte[length];
        for (int i = 0; i < length; i++)
        {
            result[i] = Byte.Parse(s.Substring(i * 2, 2), NumberStyles.HexNumber);
        }
        return result;
    }

只要您需要访问其中一个网址，就可以：

class URLs {

    class var sharedInstance: URLs {
        struct Singleton {
            static let instance = URLs()
        }
        return Singleton.instance
    }

    private var urls: NSDictionary!

    required init() {
        let filePath = NSBundle.mainBundle().pathForResource("URLs", ofType: "plist")!
        self.urls = NSDictionary(contentsOfFile:filePath)
    }

    var backendBaseUrl: String {
        get {
            return urls["BackendBaseUrl"] as! String
        }
    }

    var locationEndpoint: String {
        get {
            return urls["LocationEndpoint"] as! String
        }
    }

}

这适用于Xcode 7.1和Swift 2.1。

Swift 2 iOS 9: Plist Reading and Writing

3 个答案: