在Swift中写入设置包

Question

I have created an app with settings bundle in it and the app configuration can be changed. Reading from Settings bundle is done. I am using below code.

    let defs: NSUserDefaults = NSUserDefaults.standardUserDefaults()
    defs.synchronize()

    var settingsBundle: NSString = NSBundle.mainBundle().pathForResource("Settings", ofType: "bundle")!
    if(settingsBundle.containsString("")){
        NSLog("Could not find Settings.bundle");
        return;
    }
    var settings: NSDictionary = NSDictionary(contentsOfFile: settingsBundle.stringByAppendingPathComponent("Root.plist"))!
    var preferences: NSArray = settings.objectForKey("PreferenceSpecifiers") as! NSArray
    var defaultsToRegister: NSMutableDictionary = NSMutableDictionary(capacity: preferences.count)

    for prefSpecification in preferences {
        if (prefSpecification.objectForKey("Key") != nil) {
            let key: NSString = prefSpecification.objectForKey("Key")! as! NSString
            if !key.containsString("") {
                let currentObject: AnyObject? = defs.objectForKey(key as! String)
                if currentObject == nil {
                    // not readable: set value from Settings.bundle
                    let objectToSet: AnyObject? = prefSpecification.objectForKey("DefaultValue")

                    var objectKey : String = key as! String
                    var finalObject : String = objectToSet as! String

                    defaultsToRegister.setObject(finalObject, forKey: objectKey)
                }else{
                    //already readable: don't touch
                    var objectKey : String = key as! String
                    var finalObject : String = currentObject as! String

                    defaultsToRegister.setObject(finalObject, forKey: objectKey)
                }
            }
        }
    }
    defs.registerDefaults(defaultsToRegister as [NSObject : AnyObject])
    defs.synchronize()

The same settings can be updated the app itself. But how I can write the updated values into the Settings bundle? In this link , the accepted answer says it is possible using NSUserDefaults . But I couldn't, someonce can please help?

EDIT Please check below for more info:

{
PreferenceSpecifiers =     (
            {
        Title = Group;
        Type = PSGroupSpecifier;
    },
            {
        DefaultValue = Test1;
        Key = "multi_values";
        Title = "Multiple Values";
        Titles =             (
            FIrst,
            Second,
            Third
        );
        Type = PSMultiValueSpecifier;
        Values =             (
            FirstValue,
            SecondValue,
            ThirdValue
        );
    }
);
StringsTable = Root;

}

I am having a Settings bundle like above format and I am able to read it in the app. But how can I update this multi values selection as per I make the changes in the app? I used the following code to update the Title value.

     var settings: NSDictionary = NSDictionary(contentsOfFile: settingsBundle.stringByAppendingPathComponent("Root.plist"))!
    var preferences: NSArray = settings.objectForKey("PreferenceSpecifiers") as! NSArray


    preferences.objectAtIndex(1).setValue("MutipleValue is updated", forKey: "Title")

    settings.setValue(preferences, forKey: "PreferenceSpecifiers")

    settings.writeToFile(settingsBundle.stringByAppendingPathComponent("Root.plist"), atomically: false)

Answer 1

In link that you provided has answer to your question

Note that you shouldn't read from the settings bundle directly, as it makes no sense . You should always fetch and set user defaults using NSUserDefaults . When the user makes a change in the settings application, NSUserDefaults will reflect this automatically. They will always be kept in sync.

When you create a new item in settings.bundle , you should set it identifier .

After that, you can get required value with NSUserDefaults by following way:

if let export_enabled = NSUserDefaults.standardUserDefaults().valueForKey("export_enabled") as? Bool
{
    if let export_interval = NSUserDefaults.standardUserDefaults().valueForKey("export_interval") as? Number
    {
        // ...
    }
}

And change:

NSUserDefaults.standardUserDefaults().setValue(true, forKey: "export_enabled")

Update

iOS application on device has the following structure:

AppTitle.app
    AppTitle
    AppTitleIcon.png
    Info.plist
    com.company.apptitle.plist (read/write)
    settings.bundle (readonly)

Settings.bundle intended for forming configuration hierarchy in the default Settings.app . It contains titles of sections and settings types, but settings values are stored in com.company.apptitle.plist .

Because settings.bundle is read-only, you cannot change its structure or section titles. You can only change settings values and this change occurs in com.company.apptitle.plist via NSUserDefaults .