ios - swift 等待用户响应

Question

我创建了一个提醒:

var a = 0 // default
let userAction = UIAlertController(title: "Select", message: "Select an action", preferredStyle: UIAlertControllerStyle.alert)

userAction.addAction(UIAlertAction(title: "action 1", style: .default, handler: { (action: UIAlertAction!) in
    a = 1
}))

userAction.addAction(UIAlertAction(title: "action 2", style: .cancel, handler: { (action: UIAlertAction!) in
    a = 2
}))

present(userAction, animated: true, completion: nil)

let resp = Just.get("http://localhost/\(a)").text
return resp

在这段代码之后，我发送了一个带有参数 (a) 的请求，但请求是在选择操作之前发送的。我怎样才能等到用户选择并从警报中采取行动？

Answer 1

删除 present 调用下方的调用函数。将它移到您的警报按钮操作关闭

var a = 0 // default
let userAction = UIAlertController(title: "Select", message: "Select an 
 action", preferredStyle: UIAlertControllerStyle.alert)

userAction.addAction(UIAlertAction(title: "action 1", style: .default, 
handler: { (action: UIAlertAction!) in
    a = 1
    // Call function here
}))

userAction.addAction(UIAlertAction(title: "action 2", style: .cancel, 
handler: { (action: UIAlertAction!) in
    a = 2
    // Call function here
}))

present(userAction, animated: true, completion: nil)