ios - UIButton 选定的图像不起作用

Question

当选择 UIButton 时，我遇到了问题。代码位于 Swift 3 中:

let radioButton = UIButton(type: .system)
radioButton.frame = CGRect(x: 0, y: 0, width: 40, height: 40)
radioButton.setImage(UIImage(named: "buttonUnchecked"), for: .normal)
radioButton.setImage(UIImage(named: "buttonChecked"), for: .selected)
radioButton.setTitle("This is some text.", for: .normal)
radioButton.sizeToFit()

当通过radioButton.isSelected = true选择它时，不显示图像。

Answer 1

您可以尝试添加这样的目标

radioButton.addTarget(self, action: "addMethodName", forControlEvents: UIControlEvents.TouchUpInside)

并在方法中更改图像，如下所示:

radioButton.setImage(UIImage(named: "buttonUnchecked"), for: .normal)