禁用时如何使 UIBarButton 不灰显？

Question

我有一个UIBarButton saveBarButton屏幕图像保存到相机胶卷。当用户按下saveBarButton图像被保存并且UIBarButton saveBarButton改变UIImage doneIcon为 1.2 秒时，向用户表明图像已被保存。当saveBarButton显示doneIconI disable 时saveBarButton。但是，当我这样做时，它saveBarButton会变灰。

我的问题是：如何阻止UIBarButton禁用时变灰？

我的代码：

//create UIBarButton saveBarButton
override func viewDidLoad() {    
    let saveBarButton = UIBarButtonItem(image: UIImage(named: "saveIcon"), style: .Plain, target: self, action: "save:")
    saveBarButton.tintColor = colorGreyDark
}

//save function called when press saveBarButton
func save(sender: UIBarButtonItem) {
    //save image
    deselectShape()
    let window: UIWindow! = UIApplication.sharedApplication().keyWindow
    let windowImage = capture(window)
    UIImageWriteToSavedPhotosAlbum(windowImage
        , nil, nil, nil)

    //Change saveBarButton to indicate to user that image was saved 
    sender.image = UIImage(named: "doneIcon")
    sender.enabled = false //disable saveBarButton
    self.performSelector("canSaveAgain:", withObject: sender, afterDelay: 1.2)
}

//Change saveBarButton to original icon to indicate to user that can save another image
func canSaveAgain(sender: UIBarButtonItem){
    sender.image = UIImage(named: "saveIcon")
    sender.enabled = true //enable saveBarButton
}

看看我在说什么。

Answer 1

一种方法是 create UIBarButtonItemwithcustomView和 useuserInteractionEnabled代替enabled。

let saveBarButton = UIBarButtonItem(customView: saveButton)
saveBarButton.customView?.userInteractionEnabled = false