敲击（以编程方式）时，UIButton更改背景

Question

I have a custom UIButton but I am not able to make changing background or text color based on a quick tap. If something works, it's only on long press:

    buton.isUserInteractionEnabled = true
    buton.setTitle("text_normal", for: .normal)
    buton.setTitle("text_highlighted", for: .highlighted)
    buton.setTitle("text_selected", for: .selected)
    buton.setTitle("text_focused", for: .focused)

The only text I can get is "text_highlighted" after holding the button ~1 second. But nothing happens on short tap.

But the action is triggered correctly:

let tap2 = UITapGestureRecognizer(target: self, action: #selector(handleTap))
buton.addGestureRecognizer(tap2)


@objc func handleTap(sender: UITapGestureRecognizer) {
    print("click")
}

What I tried: Adding custom

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
...

which is also triggered later. And combining with tocuhesEnded didn't change the color temporarily as well (maybe it was too quick).

I can't use UIButton(type: .system) as well - it's not system styled button.

Similar as with changing text this is not working as well:

    self.setTitleColor(UIColor.gray, for: .normal)
    self.setTitleColor(UIColor.yellow, for: .selected)
    self.setTitleColor(UIColor.yellow, for: .highlighted)
    self.setTitleColor(UIColor.yellow, for: .focused)

I can see yellow only when long pressed. I am looking for something like this, but it needs to work on quick tap as well.

Custom button is modifying layoutSubviews(), but not colors. Custom button contains default image and label. Whole button has rounded corners. But overall nothing special is in there.

I am not using any storyboard or XIB - everything is in Swift 4 programatically. The button is supposed to lead to another ViewController, but I want to see the immediate feedback on click. Something like when created from storyboard: https://youtu.be/lksW12megQg?t=3m25s - not even simple alpha change works for me right now.

Answer 1

检查uibutton的isselected属性是否被选中，然后更改按钮的背景色

Answer 2

Jen Jose was right - there was a problem with my parent class which was 'eating up' my touches. I confirmed this when moving it to different ViewController + I had the same issue with table, which couldn't handle touch events ( https://stackoverflow.com/a/9248827/1317362 )

EDIT:

To be precise - this button was in a UIScrollView.

Adding scrollView.delaysContentTouches = NO; solved the issue completely.

Details: https://stackoverflow.com/a/16650610/1317362