Ios 检测系统警报视图何时出现/何时解除
我想检测系统警报视图(如应用内购买确认警报)何时出现在屏幕上。 我正在尝试向UIApplication添加键值观察者,但它不起作用Ios 检测系统警报视图何时出现/何时解除,ios,swift,uialertview,key-value-observing,Ios,Swift,Uialertview,Key Value Observing,我想检测系统警报视图(如应用内购买确认警报)何时出现在屏幕上。 我正在尝试向UIApplication添加键值观察者,但它不起作用 UIApplication.sharedApplication().addObserver(self, forKeyPath: "windows", options: NSKeyValueObservingOptions.allZeros, context: &myContext) 查看UIAlertViewDelegate文档。有一些方法,如willPr
UIApplication.sharedApplication().addObserver(self, forKeyPath: "windows", options: NSKeyValueObservingOptions.allZeros, context: &myContext)
查看
UIAlertViewDelegate
文档。有一些方法,如willPresentAlertView:
,didPresentAlertView:
,alertView:willDismissWithButtonIndex:
,和alertView:didDismissWithButtonIndex:
查看UIAlertViewDelegate
文档。有一些方法,如:willPresentAlertView:,didPresentAlertView:
,alertView:willDismissWithButtonIndex:
,和alertView:didDismissWithButtonIndex:
,这不是我想要的,但对我来说很有用
NotificationCenter.addObserver(self, selector: "applicationWillResignActive", name: UIApplicationWillResignActiveNotification, object: nil)
NotificationCenter.addObserver(self, selector: "applicationDidBecomeActive", name: UIApplicationDidBecomeActiveNotification, object: nil)
func applicationDidBecomeActive()
{
if Library.isPurchasing
{
Application.networkActivityIndicatorVisible = true
}
}
func applicationWillResignActive()
{
if Library.isPurchasing
{
Application.networkActivityIndicatorVisible = false
}
}
这不是我想要的,但对我来说很有用
NotificationCenter.addObserver(self, selector: "applicationWillResignActive", name: UIApplicationWillResignActiveNotification, object: nil)
NotificationCenter.addObserver(self, selector: "applicationDidBecomeActive", name: UIApplicationDidBecomeActiveNotification, object: nil)
func applicationDidBecomeActive()
{
if Library.isPurchasing
{
Application.networkActivityIndicatorVisible = true
}
}
func applicationWillResignActive()
{
if Library.isPurchasing
{
Application.networkActivityIndicatorVisible = false
}
}
更有可能的原因是iOS 8不再使用UIAlertView,因此警报不再有单独的窗口。我想问一下,您是否需要了解系统警报的具体原因?像这样监视系统弹出窗口是非常不规则的。我想开始设置微调器的动画,当警报弹出窗口停止设置动画时。看看这个:也许它可以帮助您:[[1]:更有可能是因为iOS 8不再使用UIAlertView,因此警报不再有单独的窗口。我想问一下,您是否有任何特定的原因需要了解系统警报?像这样监视系统弹出窗口是非常不规则的。我想开始设置微调器动画,并在警报弹出窗口停止动画时设置动画。拍摄看看这个:也许它可以帮助您:[[1]:在swift 5:NotificationCenter.default.addObserver(self,selector:#selector(applicationWillResignActive),name:UIApplication.WillResignActification,object:nil)在swift 5:NotificationCenter.default.addObserver(self,selector:#selector(applicationWillResignActive),name:UIApplication.WillResignActification,object:nil),名称:UIApplication.willResignActiveNotification,对象:nil)