如何在Swift中按下時更改條形按鈕的圖標？

我在Swift中創建了一個秒錶，並且我想將按鈕按下時啓動秒錶的時間圖標更改爲用於條形按鈕的暫停圖標。你怎麼做到這一點？如何在Swift中按下時更改條形按鈕的圖標？

2015-06-10 Faiz Surani

這是我做到了斯威夫特3：

var favoritesBarButtonOn: UIBarButtonItem! 
var favoritesBarButtonOFF: UIBarButtonItem! 

favoritesBarButtonOn = UIBarButtonItem(image: #imageLiteral(resourceName: "TabBarIconSettingsOff"), style: .plain, target: self, action: #selector(didTapFavoritesBarButtonOn)) 
favoritesBarButtonOFF = UIBarButtonItem(image: #imageLiteral(resourceName: "TabBarIconSettingsOn"), style: .plain, target: self, action: #selector(didTapFavoritesBarButtonOFF)) 

self.navigationItem.rightBarButtonItems = [self.rightNavBarButton, self.favoritesBarButtonOn] 

func didTapFavoritesBarButtonOn() { 
    self.navigationItem.setRightBarButtonItems([self.rightNavBarButton, self.favoritesBarButtonOFF], animated: false) 
    print("Show Favorites") 
} 

func didTapFavoritesBarButtonOFF() { 
    self.navigationItem.setRightBarButtonItems([self.rightNavBarButton, self.favoritesBarButtonOn], animated: false) 
    print("Show All Chat Rooms") 
}

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2017-03-26 08:52:50

在運行期間，您不能更改UIBarButtonItem的樣式。您必須刪除UIBarButtonItem，然後添加您想要的UIBarButtonItem。

@IBOutlet weak var toolBar: UIToolbar! 
var pauseButton = UIBarButtonItem() 
var playButton = UIBarButtonItem() 
var arrayOfButtons = [AnyObject]() 

override func viewDidLoad() { 
    super.viewDidLoad() 
    pauseButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Pause, target: self, action: "pauseButtonTapped") 
    playButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Play, target: self, action: "playButtonTapped") 

    arrayOfButtons = self.toolBar.items! 
    arrayOfButtons.insert(playButton, atIndex: 0) // change index to wherever you'd like the button 
    self.toolBar.setItems(arrayOfButtons, animated: false) 
} 

func playButtonTapped() { 
    arrayOfButtons = self.toolBar.items! 
    arrayOfButtons.removeAtIndex(0) // change index to correspond to where your button is 
    arrayOfButtons.insert(pauseButton, atIndex: 0) 
    self.toolBar.setItems(arrayOfButtons, animated: false) 
} 

func pauseButtonTapped() { 
    arrayOfButtons = self.toolBar.items! 
    arrayOfButtons.removeAtIndex(0) // change index to correspond to where your button is 
    arrayOfButtons.insert(playButton, atIndex: 0) 
    self.toolBar.setItems(arrayOfButtons, animated: false) 
}

UIBarButtonItem Class Reference

來源

2015-06-11 01:04:09

我相信你已經找到了你的問題的解決方案，但我會在任何人的情況下仍然需要它離開這個。

UIBarButtonItem不是UIControl，但是你可以用自定義視圖初始化它，即自定義UIButton程序如下：

let playButton = UIButton(frame: CGRectMake(0, 0, 30, 30)) 
playButton.addTarget(self, action: "togglePlay:", forControlEvents: .TouchUpInside) 
playButton.setImage(UIImage(named: "play-active"), forState: .Normal) 
playButton.setImage(UIImage(named: "play-inactive"), forState: .Selected) 
let rightButton = UIBarButtonItem(customView: playButton) 
self.navigationItem.setRightBarButtonItems([rightButton], animated: true)

想法來自Custom "Pressed" UIBarButtonItem Backgrounds

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2015-11-17 18:44:45

如何在Swift中按下時更改條形按鈕的圖標？

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