UIButton选择的图像不工作

Question

我有一个问题与UIButton，当它被选中。代码在Swift 3:

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radioButton.isSelected = true选中时，不显示图像

Answer 1

您可以尝试添加这样一个目标

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

，在方法中你像这样改变图像:

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

Answer 2

您可能应该使用自定义按钮类型而不是系统类型。试试这个:

    let radioButton = UIButton(type: .Custom)

代替

    let radioButton = UIButton(type: .system)