按鈕與圖像，圖像消失點擊按鈕時iOS 10

Question

@IBAction func btnPrimaryAction(_ sender: Any) { 
     btnPrimary.setImage(UIImage(named : "checkbox_on.png") , for: UIControlState.normal) 
     btnSecondary.setImage(UIImage(named : "checkbox_off.png"), for: UIControlState.normal) 
     btnNewAdd.setImage(UIImage(named : "checkbox_off.png") , for: UIControlState.normal) 
     payType = 1 
    } 

我正在使用此代碼來更改按鈕圖像時單擊按鈕。但按鈕的圖像消失的iOS 10.單擊按鈕時

請幫我這個 謝謝你是進步

Answer 1

我認爲這是使用UIButton國家有效的方式。 UIButton有多個狀態，如UIControlState.normal,UIControlState.selected,UIControlState.highlighted等。 您可以使用UIButton的UIControlState輕鬆解決您的問題。 首先你需要像這樣設置圖像到你的按鈕。 在viewDidLoad方法。

// if you have add the "checkbox_off.png and checkbox_on.png" in Images.xcassets then get the image you need to write as below 
//UIImage(named : "checkbox_off") no need to add extention like ".png" 

btnPrimary.setImage(UIImage(named : "checkbox_off.png") , for: UIControlState.normal) 
btnSecondary.setImage(UIImage(named : "checkbox_off.png"), for: UIControlState.normal) 
btnNewAdd.setImage(UIImage(named : "checkbox_off.png") , for: UIControlState.normal) 

// Selected  
btnPrimary.setImage(UIImage(named : "checkbox_on.png") , for: UIControlState.selected) 
btnSecondary.setImage(UIImage(named : "checkbox_on.png"), for: UIControlState.selected) 
btnNewAdd.setImage(UIImage(named : "checkbox_on.png") , for: UIControlState.selected) 

現在在你的函數只是改變了按鈕的狀態

@IBAction func btnPrimaryAction(_ sender: Any) { 
    btnPrimary.selected = true 
    btnSecondary.selected = false 
    btnNewAdd.selected = false 
    payType = 1 
}