[英]How to detect all touches in Swift 2
I'm trying to create a timeout function for an app I'm develop using Swift 2 but in swift 2, you can put this code in the app delegate and it works but it does not detect any keyboard presses, button presses, textfield presses, and etc: 我正在尝试为我正在使用Swift 2开发的应用程序创建超时功能,但在swift 2中,您可以将此代码放在应用程序委托中并且它可以工作,但它不会检测到任何键盘按下,按钮按下,文本字段按下, 等等:
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
super.touchesBegan(touches, withEvent: event);
let allTouches = event!.allTouches();
if(allTouches?.count > 0) {
let phase = (allTouches!.first as UITouch!).phase;
if(phase == UITouchPhase.Began || phase == UITouchPhase.Ended) {
//Stuff
timeoutModel.actionPerformed();
}
}
}
Before swift 2, I was able to have the AppDelegate subclass UIApplication and override sendEvent: like this: 在swift 2之前,我能够拥有AppDelegate子类UIApplication并覆盖sendEvent:像这样:
-(void)sendEvent:(UIEvent *)event
{
[super sendEvent:event];
// Only want to reset the timer on a Began touch or an Ended touch, to reduce the number of timer resets.
NSSet *allTouches = [event allTouches];
if ([allTouches count] > 0) {
// allTouches count only ever seems to be 1, so anyObject works here.
UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
if (phase == UITouchPhaseBegan || phase == UITouchPhaseEnded)
[[InactivityModel instance] actionPerformed];
}
}
The code above works for every touch but the swift equivalent only works when a view does not exist above that UIWindow's hierarchy? 上面的代码适用于每次触摸,但只有在UIWindow的层次结构之上不存在视图时,swift等效项才有效吗?
Does anyone know a way to detect every touch in the application? 有没有人知道检测应用程序中每一次触摸的方法?
As I have something similar in my application, I just tried to fix it: 由于我在我的应用程序中有类似的东西,我只是试图解决它:
sendEvent
in UIWindow
- doesn't work UIWindow
sendEvent
- 不起作用 sendEvent
in delegate - doesn't work sendEvent
- 不起作用 So the only way is to provide custom UIApplication
subclass. 所以唯一的方法是提供自定义
UIApplication
子类。 My code so far (works on iOS 9) is: 到目前为止,我的代码(适用于iOS 9)是:
@objc(MyApplication) class MyApplication: UIApplication {
override func sendEvent(event: UIEvent) {
//
// Ignore .Motion and .RemoteControl event
// simply everything else then .Touches
//
if event.type != .Touches {
super.sendEvent(event)
return
}
//
// .Touches only
//
var restartTimer = true
if let touches = event.allTouches() {
//
// At least one touch in progress?
// Do not restart auto lock timer, just invalidate it
//
for touch in touches.enumerate() {
if touch.element.phase != .Cancelled && touch.element.phase != .Ended {
restartTimer = false
break
}
}
}
if restartTimer {
// Touches ended || cancelled, restart auto lock timer
print("Restart auto lock timer")
} else {
// Touch in progress - !ended, !cancelled, just invalidate it
print("Invalidate auto lock timer")
}
super.sendEvent(event)
}
}
Why there's @objc(MyApplication)
. 为什么有
@objc(MyApplication)
。 That's because Swift mangles names in a different way then Objective-C and it just says - my class name in Objective-C is MyApplication
. 那是因为Swift以与Objective-C不同的方式破坏了名称 - 它只是说 - 我在Objective-C中的类名是
MyApplication
。
To make it working, open your info.plist and add row with Principal class key and MyApplication
value ( MyApplication
is what's inside @objc(...)
, not your Swift class name). 要使其工作,请打开info.plist并添加具有Principal类键和
MyApplication
值的行( MyApplication
是@objc(...)
内部的@objc(...)
,而不是您的Swift类名称)。 Raw key is NSPrincipalClass
. 原始密钥是
NSPrincipalClass
。
UIWindow
also has a sendEvent
method that you can override. UIWindow
还有一个可以覆盖的sendEvent
方法。 That would allow you to track the time since the last screen touch. 这样您就可以跟踪自上次触摸屏幕以来的时间。 Swift 4:
斯威夫特4:
class IdlingWindow: UIWindow {
/// Tracks the last time this window was interacted with
var lastInteraction = Date.distantPast
override func sendEvent(_ event: UIEvent) {
super.sendEvent(event)
lastInteraction = Date()
}
}
If you're using a storyboard, you can load it in didFinishLaunchingWithOptions
: 如果您正在使用故事板,则可以在
didFinishLaunchingWithOptions
加载它:
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: IdlingWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = IdlingWindow(frame: UIScreen.main.bounds)
window?.rootViewController = UIStoryboard.init(name: "Main", bundle: nil).instantiateInitialViewController()
window?.makeKeyAndVisible()
return true
}
:
}
extension UIApplication {
/// Conveniently gets the last interaction time
var lastInteraction: Date {
return (keyWindow as? IdlingWindow)?.lastInteraction ?? .distantPast
}
}
Now elsewhere in your app, you can check for inactivity like this: 现在您的应用程序中的其他位置,您可以检查不活动,如下所示:
if UIApplication.shared.lastInteraction.timeIntervalSinceNow < -2 {
// the window has been idle over 2 seconds
}
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