如何选择一个按钮？

Question

我想创建一个使用AVPlayer的循环按钮。当用户点击一个按钮（循环）时，我希望它保持选中状态，直到用户再次点击它以取消选择它为止。我有以下代码，但它似乎并没有工作。谢谢！

@IBAction func didTapLoopButton(_ sender: Any) { 
    guard let loopButton = sender as? UIButton else { 
     return 
    } 

    if loopButton.state == .selected { 
     print("selected") 


    } else { 
     print("deselected") 
    } 
} 

Answer 1

试试这个：

@IBAction func didTapLoopButton(_ sender: Any) { 
    guard let loopButton = sender as? UIButton else { 
     return 
    } 

    let selected = !loopButton.isSelected 

    if selected { 
     print("selected") 
    } else { 
     print("deselected") 
    } 

    loopButton.isSelected = selected 
} 

Answer 2

从问题结合以上回答：

@IBAction func didTapLoopButton(_ sender: Any) { 
    guard let loopButton = sender as? UIButton else { 
     return 
    } 

    loopButton.isSelected = !loopButton.isSelected 

    if loopButton.state == .selected { 
     print("selected") 


    } else { 
     print("deselected") 
    } 
}