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[英]Checking the value in textfield before alert controller hides - iOS swift
[英]ios Swift 2: extension - Alert with textfield
我正在尝试使用带有扩展名uialertcontroller的文本字段的uialertcontroller创建函数
这是我的代码:
extension UIAlertController{
class func AlertWithTextField(here: String, message1 : String) -> UIAlertController{
var alertController:UIAlertController?
alertController = UIAlertController(title: here,
message: message1,
preferredStyle: .Alert)
alertController!.addTextFieldWithConfigurationHandler(
{(textField: UITextField!) in
textField.placeholder = "Ex: 1"
textField.textAlignment = .Center
textField.delegate = self
textField.keyboardType = UIKeyboardType.NumberPad
})
let action = UIAlertAction(title: "Submit",
style: UIAlertActionStyle.Default,
handler: {[weak self]
(paramAction:UIAlertAction!) in
if let textFields = alertController?.textFields{
let theTextFields = textFields as! [UITextField]
let enteredText = theTextFields[0].text
print("\n\(enteredText)") }
})
let action2 = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil)
alertController?.addAction(action)
alertController?.addAction(action2)
}}
好的,我对“自我”一词有疑问,但我找不到解决方案,这个问题的解决方案是什么?
对于您的第一个自我问题,我建议您做这样的事情
class func AlertWithTextField(here: String, message1 : String, delegate:UITextFieldDelegate?) -> UIAlertController{
var alertController:UIAlertController?
alertController = UIAlertController(title: here,
message: message1,
preferredStyle: .Alert)
alertController!.addTextFieldWithConfigurationHandler(
{(textField: UITextField!) in
textField.placeholder = "Ex: 1"
textField.textAlignment = .Center
textField.delegate = delegate
textField.keyboardType = UIKeyboardType.NumberPad
})
let action = UIAlertAction(title: "Submit",
style: UIAlertActionStyle.Default,
handler: {(paramAction:UIAlertAction!)->Void in
if let textFields = alertController?.textFields {
let theTextFields = textFields
let enteredText = theTextFields[0].text
print("\n\(enteredText)") }
})
let action2 = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil)
alertController?.addAction(action)
alertController?.addAction(action2)
return alertController!
}
您可以在静态方法中接受UITextFieldDelegate对象,然后将其分配给委托,对于第二个问题,您声明弱的self而不在闭包中使用它,因此只需删除该对象,代码就可以正常工作。
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