我正在尝试使用一个警报 Controller ,其中包括多个警报显示功能和一个关闭功能。但我有 this warning在我的控制台和我的其他警报不显示。我想知道为什么?以及解决方案。
这是我的警报 Controller
import UIKit
class MyAlertViewController: UIViewController {
var myAlertController : UIAlertController!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func displayLoadingAlert(viewController: UIViewController?) -> UIAlertController {
var controllerToPresent = viewController
if controllerToPresent == nil {
controllerToPresent = self
}
//create an alert controller
myAlertController = UIAlertController(title: "Loading...", message: “We are receiving data,please wait“, preferredStyle: .ActionSheet)
controllerToPresent!.presentViewController(myAlertController, animated: true, completion: nil)
return myAlertController
}
func connectionErrorAlert(viewController: UIViewController?) -> UIAlertController {
var controllerToPresent = viewController
if controllerToPresent == nil {
controllerToPresent = self
}
//create an alert controller
myAlertController = UIAlertController(title: "Not Connected", message: “No internet Connection”, preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Default,handler:nil)
myAlertController.addAction(defaultAction)
controllerToPresent!.presentViewController(myAlertController, animated: true, completion: nil)
return myAlertController
}
func requestTimeOutErrorAlert(viewController: UIViewController?) -> UIAlertController {
var controllerToPresent = viewController
if controllerToPresent == nil {
controllerToPresent = self
}
//create an alert controller
myAlertController = UIAlertController(title: "Request Time Out", message: “Please Click Retry”, preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Default,handler:nil)
myAlertController.addAction(defaultAction)
controllerToPresent!.presentViewController(myAlertController, animated: true, completion: nil)
return myAlertController
}
func dismissLoadingAlert(){
myAlertController.dismissViewControllerAnimated(true, completion: nil)
}
}
当我从 API 获得结果时,我曾经执行 dismissLoadingAlert()
。但是,当我没有从 API 获得结果时。我过去常常从我的协议(protocol)中执行这个委托(delegate)方法。
func didNotReceiveAPIResults(results: Bool,error:NSError){
dispatch_async(dispatch_get_main_queue(), {
// This condition will be enter if we dont get the results and show user with alert.
if (results) {
// I have done dismiss first data receiving alert,what do i doing wrong?
self.myAlertController.dismissLoadingAlert()
if error.localizedDescription == "The Internet connection appears to be offline."{
self.myAlertController.connectionErrorAlert(self)
self.carTableView.hidden=true
self.retryButton?.hidden=false
self.retryButton?.enabled=true
}
if error.localizedDescription == "Request Time Out."{
self.myAlertController.requestTimeOutErrorAlert(self)
self.carTableView.hidden=true
self.retryButton?.hidden=false
self.retryButton?.enabled=true
}
}else{
self.myAlertController.displayLoadingAlert(self)
self.retryButton?.hidden=true
self.retryButton?.enabled=false
self.carTableView.hidden=false
self.carTableView.reloadData()
}
})
}
最佳答案
你走错了路。您不应该子类化该 Controller 。
The UIAlertController class is intended to be used as-is and does not support subclassing. The view hierarchy for this class is private and must not be modified.
如果您需要一个方便的类,请使用呈现动态 UIAlertController
实例的 NSObject
子类进行重构。
关于ios - 无法完全关闭我以前的 alertcontroller,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30840235/