在UIAlertAction中返回int或在UIAlertAction后返回int(return int in UIAlertAction or return int after UIAlertAct

在UIAlertAction中返回int或在UIAlertAction后返回int(return int in UIAlertAction or return int after UIAlertAction)

我想在UIAlertAction中返回一个整数。 现在我收到错误“Int不能转换为Void”。 警报所在的函数应该返回int。

这是我的代码：

func writeSteps() -> Int { var allergies = 0 var severe = UIAlertController(title: "More information", message: "blablabla", preferredStyle: UIAlertControllerStyle.Alert) severe.addAction(UIAlertAction(title: "Yes", style: .Default, handler: { (action: UIAlertAction!) in allergies += 1 return allergies })) severe.addAction(UIAlertAction(title: "No", style: .Default, handler: { (action: UIAlertAction!) in allergies += 2 return allergies })) self.presentViewController(severe, animated: true, completion: nil) }

这可能吗？

如果没有，每当我尝试在uiAlertController之后返回某个东西时，它首先返回，然后出现uialert。 有没有办法让uialert先去，然后返回一个变量？

I would like to return an integer in a UIAlertAction. Right now I get the error 'Int is not convertible to Void.' The function the alert is in is supposed to return int.

Here is my code:

func writeSteps() -> Int { var allergies = 0 var severe = UIAlertController(title: "More information", message: "blablabla", preferredStyle: UIAlertControllerStyle.Alert) severe.addAction(UIAlertAction(title: "Yes", style: .Default, handler: { (action: UIAlertAction!) in allergies += 1 return allergies })) severe.addAction(UIAlertAction(title: "No", style: .Default, handler: { (action: UIAlertAction!) in allergies += 2 return allergies })) self.presentViewController(severe, animated: true, completion: nil) }

Is this possible?

If not, whenever I try to return something after the uiAlertController, it returns that first, and then the uialert appears. Is there a way to make the uialert go first and then return a variable?

最满意答案

如果你只是试图更新allergies的价值，你可以保留一个参考你试图更新的属性（self.allergies），然后你可以在你的行为中增加。

如果需要返回此值，可以在处理程序中调用第二种方法：

severe.addAction(UIAlertAction(title: "No", style: .Default, handler: { (action: UIAlertAction!) in self.returnAllergiesWithVal(2); }))

然后returnAllergiesWithVal方法可以将该值传递到任何需要的地方。

If you are simply trying to update the value in allergies you could keep a reference to the property you're trying to update (self.allergies) which you can then increment in your actions.

If you need to return this value, you could call a second method within your handlers:

severe.addAction(UIAlertAction(title: "No", style: .Default, handler: { (action: UIAlertAction!) in self.returnAllergiesWithVal(2); }))

Where the returnAllergiesWithVal method can then pass that value on to wherever you need it.