访问UIAlertControllers textField

Question

我想,我在处理程序操作中访问UIAlertController的textField时遇到了麻烦.我已经用Google搜索了错误,但没有从中得到太多.我正在使用Swift和Xcode 6.0.1.这是错误:

'[AnyObject]?' does not have a member named 'subscript'

@IBAction func addPressed(sender: UIBarButtonItem) {
    var alert = UIAlertController(title: "New Event", message: "Name of the event?", preferredStyle: .ActionSheet)
    alert.addTextFieldWithConfigurationHandler(){
        textField in
        textField.placeholder = "Christmas"
        textField.becomeFirstResponder()
    }
    alert.addAction(UIAlertAction(title: "Save", style: .Default, handler: {
        action in
        var text = alert.textFields[0].text // <-- cant access alert? The exclamation mark appears here
    }))

}

使用((alert.textFields[0] as UITextField).text)给了我完全相同的错误.

Answer 1

您需要做的就是解开UITextFields数组,然后将其转换为UITextField,因为它实际上是AnyObject数组.

这是代码应该是什么样子:

var text = (alert.textFields![0] as UITextField).text