按下时 UIButton 不会改变文本颜色

Question

以编程方式创建的 UIButton 在按下时不会改变颜色，就像使用 Interface Builder 创建的所有其他按钮一样。

我的按钮创建如下：

        let cableDetailsButton = UIButton(type: UIButtonType.System)
        cableDetailsButton.frame = CGRectMake(8, 8, 42, 21)
        cableDetailsButton.setTitle("Title", forState: UIControlState.Normal)
        cableDetailsButton.setTitleColor(self.view.tintColor, forState: .Normal)
        cableDetailsButton.setTitleColor(UIColor.blackColor(), forState: UIControlState.Highlighted)
        cableDetailsButton.addTarget(self, action: #selector(FuseDetailsViewController.cableButtonPressed), forControlEvents: .TouchUpInside)

我想补充一点，tintColor 是 iOS 的默认颜色（蓝色）

我的目标是以编程方式创建与从 Interaface Builder 列表中拖放的按钮相同的（默认！）按钮。我希望我的按钮在按下时改变颜色/alpha。

我正在使用 Swift 2.3

不幸的是，如此简单的任务让我不知所措，以至于我不得不寻求帮助。提前感谢您的帮助。

更新：按钮是 UISCrollView 的一部分

Answer 1

代替

let cableDetailsButton = UIButton(type: UIButtonType.system)

您需要将UIButtonType 更改为.custom

let cableDetailsButton = UIButton(type: UIButtonType.custom)

如果您使用的是 Swift3，那么语法也不正确。在下面找到更正的语法

let cableDetailsButton = UIButton(type: UIButtonType.custom)
cableDetailsButton.frame = CGRect(x: 8, y: 8, width: 42, height: 21)
cableDetailsButton.setTitle("Dane o przewodach", for: UIControlState.normal)
cableDetailsButton.setTitleColor(self.view.tintColor, for: .normal)
cableDetailsButton.setTitleColor(UIColor.black, for: UIControlState.highlighted)
cableDetailsButton.addTarget(self, action: #selector(self.cableButtonPressed), for: .touchUpInside)

Answer 2

这对我有用。

    let cableDetailsButton = UIButton(type: .Custom)
    cableDetailsButton.frame = CGRect(x: 68, y: 68, width: 100, height: 70)
    cableDetailsButton.setTitle("Some button", forState: .Normal)
    cableDetailsButton.setTitleColor(self.view.tintColor, forState: .Normal)
    cableDetailsButton.setTitleColor(UIColor.blackColor(), forState: .Highlighted)
    view.addSubview(cableDetailsButton)

或者我没有完全理解你的问题。

Answer 3

高亮按钮有两种方法

方法 1

   let cableDetailsButton = UIButton(type: UIButtonType.System)
    cableDetailsButton.frame = CGRectMake(20, 50, self.view.frame.size.width - 32, 50)
    cableDetailsButton.setTitle("Title", forState: UIControlState.Normal)
    cableDetailsButton.addTarget(self, action: #selector(cableButtonPressed(_:)), forControlEvents: UIControlEvents.TouchUpInside)
    cableDetailsButton.backgroundColor = UIColor.whiteColor()
    self.view.addSubview(cableDetailsButton)

    func cableButtonPressed(sender: UIButton){
        dispatch_async(dispatch_get_main_queue(), {

            if self.isHighLighted == false{
                sender.highlighted = true;
                self.isHighLighted = true
            }else{
                sender.highlighted = false;
                self.isHighLighted = false
            }
        });
    }

方法 2

    let cableDetailsButton = UIButton(type: UIButtonType.System)
    cableDetailsButton.frame = CGRectMake(20, 50, self.view.frame.size.width - 32, 50)
    cableDetailsButton.setTitle("Title", forState: UIControlState.Normal)
    cableDetailsButton.setTitleColor(UIColor.greenColor(), forState: UIControlState.Normal)
    cableDetailsButton.setTitleColor(UIColor.orangeColor(), forState: UIControlState.Highlighted)
    cableDetailsButton.addTarget(self, action: #selector(cableButtonPressed(_:)), forControlEvents: UIControlEvents.TouchUpInside)
    self.view.addSubview(cableDetailsButton)


  func cableButtonPressed(sender: UIButton){
        if sender.selected {
            // set selected
            sender.selected = true
        } else {
            // set deselected
            sender.selected = false
        }

    }

Answer 4

1. 在你的视图控制器中实现一个标志

   var buttonSelected = false
   

2. 保留按钮的代码，但删除一行

   let cableDetailsButton = UIButton(type: UIButtonType.System)
   cableDetailsButton.frame = CGRectMake(8, 8, 42, 21)
   cableDetailsButton.setTitle("Title", forState: UIControlState.Normal)
   cableDetailsButton.setTitleColor(self.view.tintColor, forState: .Normal)
   cableDetailsButton.addTarget(self, action: #selector(FuseDetailsViewController.cableButtonPressed), forControlEvents: .TouchUpInside)
   

3. 在您的目标函数中添加以下内容

   func cableButtonPressed() {
       if buttonSelected {
          cableDetailsButton.setTitleColor(self.view.tintColor, forState: .Normal)
          buttonSelected = !buttonSelected
          //do whatever else you need to do
       } else {
          cableDetailsButton.setTitleColor(UIColor.blackColor(), forState: .Normal)
          buttonSelected = !buttonSelected
          //do whatever else you need to do
       }
       //do whatever else you need to do
   }