警报完成不完全正常

Question

我有一个警报,在显示警报后,我想呈现一个不同的viewFinder.触发doSomething()函数,打印"TEST",但不显示新的取景器.我错过了什么？

警报

let alert = UIAlertController(title: "Sorry", message: "Booked out.",
preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style:
UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: self.doSomething)

content func doSomething()

print("TEST")
let details = storyboard?.instantiateViewController(withIdentifier: "ViewLimo2")
details?.transitioningDelegate = slideAnimatorRight
present(details!, animated: true, completion: nil)

Answer 1

取消视图控制器时,视图控制器上的完成块不会触发.它在视图控制器完成呈现时触发(例如,它已完成viewDidAppear).

老实说,我希望这会崩溃,因为你正试图在警报仍然存在时出现.

在任何情况下,您需要等到解除UIAlertController之前尝试呈现下一个View Controller.

您可以在操作的处理程序中执行此OK操作:

    let alert = UIAlertController(title: "Sorry", message: "Booked out.",
                                  preferredStyle: UIAlertControllerStyle.alert)
    alert.addAction(UIAlertAction(title: "OK", style:
        UIAlertActionStyle.default, handler: doSomething))
    self.present(alert, animated: true, completion: nil)

...

func doSomething(action:UIAlertAction) {
    /// present the next VC here
}