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Swift UI学习之UIAlertController(变得麻烦了)
在代码中使用了UIAlertView,由于没有智能的提示，编译没有问题，但当触发时，就会崩溃，而且没有
出现任何提示，不知道是什么错误，大家如果遇到同样的情况，就知道怎么解决了。
这里写了一个扩展，这样更方便使用了
import Foundation
import UIKit
extension UIAlertController {
class func showAlert(
presentController: UIViewController!,
title: String!,
message: String!,
cancelButtonTitle: String? = "cancel",
okButtonTitle: String? = "ok") {
let alert = UIAlertController(title: title!, message: message!, preferredStyle: UIAlertControllerStyle.Alert)
if cancelButtonTitle {
alert.addAction(UIAlertAction(title: cancelButtonTitle!, style: UIAlertActionStyle.Default, handler: nil))// do not handle cancel, just dismiss
}
if okButtonTitle {
alert.addAction(UIAlertAction(title: okButtonTitle!, style: UIAlertActionStyle.Default, handler: nil))// do not handle cancel, just dismiss
}
presentController!.presentViewController(alert, animated: true, completion: nil)
}
class func showAlert(
presentController: UIViewController!,
title: String!,
message: String!,
cancelButtonTitle: String? = "cancel",
okButtonTitle: String? = "ok",
okHandler: ((UIAlertAction!) -> Void)!) {
let alert = UIAlertController(title: title!, message: message!, preferredStyle: UIAlertControllerStyle.Alert)
if cancelButtonTitle {
alert.addAction(UIAlertAction(title: cancelButtonTitle!, style: UIAlertActionStyle.Default, handler: nil))// do not handle cancel, just dismiss
}
if okButtonTitle {
alert.addAction(UIAlertAction(title: okButtonTitle!, style: UIAlertActionStyle.Default, handler: okHandler))// do not handle cancel, just dismiss
}
presentController!.presentViewController(alert, animated: true, completion: nil)
}
}
调用来测试
func onButtonClick(sender: UIButton!) {
println("clicked button")
// UIAlertController.showAlert(self, title: "title", message: "message")
// UIAlertController.showAlert(self, title: "title", message: "message", cancelButtonTitle: "cancel", okButtonTitle: "ok")
UIAlertController.showAlert(self, title: "title", message: "message", cancelButtonTitle: "cancel", okButtonTitle: "ok", okHandler: {
(UIAlertAction) in
println("no nothing")
})
// do not use below
//alert.show()
// create UIAlertView
// let alertView = UIAlertView(title: "alertView", message: "clickedButton event", delegate: self, cancelButtonTitle: "cancel", otherButtonTitles: "ok")
// alertView.show()
}
最后更新：2017-04-03 07:56:58