我是初级程序员.我正在尝试向Alert上的按钮添加操作,但它不起作用.我只想测试警报按钮选项是否可以更改标签中的文本,但它不起作用.当然,我可以很好地看到警报和按钮,但点击按钮后没有任何反应.
@IBOutlet var statusLabelAlert : UILabel
var alertTest = UIAlertView()
@IBAction func alertButton(sender : AnyObject) {
alertTest.message = "Select one!"
alertTest.addButtonWithTitle("1st")
alertTest.addButtonWithTitle("2nd")
alertTest.addButtonWithTitle("3rd")
alertTest.title = "Test Alert"
alertTest.show()
}
func alertView(alertView: UIAlertView!,clickedButtonAtIndex buttonIndex: Int){
switch buttonIndex{
case 0:
statusLabelAlert.text = "1st"
case 1:
statusLabelAlert.text = "2nd"
case 2:
statusLabelAlert.text = "3rd"
default:
statusLabelAlert.text = "error"
}
}
解决方法
你的clickedButtonAtIndex方法是否正在调用？设置断点并调试代码.
您没有设置alertView的委托.
您没有设置alertView的委托.
@IBOutlet var statusLabelAlert : UILabel
var alertTest = UIAlertView()
alertTest.delegate = self //set the delegate of alertView
@IBAction func alertButton(sender : AnyObject) {
alertTest.message = "Select one!"
alertTest.addButtonWithTitle("1st")
alertTest.addButtonWithTitle("2nd")
alertTest.addButtonWithTitle("3rd")
alertTest.title = "Test Alert"
alertTest.show()
}
func alertView(alertView: UIAlertView!,clickedButtonAtIndex buttonIndex: Int){
switch buttonIndex{
case 0:
statusLabelAlert.text = "1st"
case 1:
statusLabelAlert.text = "2nd"
case 2:
statusLabelAlert.text = "3rd"
default:
statusLabelAlert.text = "error"
}
}