在iOS7上区分屏幕锁定和主屏幕按钮

问题描述

我需要在 applicationDidEnterBackground 中执行一些操作。但我需要区分哪个用户操作导致输入背景：屏幕锁定或主页按钮。

我使用这个代码，这是从：

  UIApplicationState state = [application applicationState]; 
 if（state == UIApplicationStateInactive）{
 NSLog（@通过锁定屏幕发送到后台）; 
} else if（state == UIApplicationStateBackground）{
 NSLog（@通过主页按钮发送到后台/切换到其他应用程序）; 
} 
  

在iOS6上可以正常工作。但在iOS7（设备和模拟器）上，我总是得到 UIApplicationStateBackground ，无论用户是点击home还是lock按钮。

有人知道什么可能导致这种情况吗？ iOS 7更新多任务后台处理？

还有其他解决方案吗？

解决方案

这可以帮助你在iOS6& iOS7：）。

当用户按下锁定按钮时，您会得到一个 com.apple.springboard.lockcomplete 通知。

  // new way 
 //将这放入 - （BOOL）应用程序：（UIApplication *）application didFinishLaunchingWithOptions： （NSDictionary *）launchOptions 
 CFNotificationCenterAddObserver（CFNotificationCenterGetDarwinNotifyCenter（），
 NULL，
 displayStatusChanged，
 CFSTR（com.apple.springboard.lockcomplete），
 NULL， 
 CFNotificationSuspensionBehaviorDeliverImmediately）; 
 
 //将此函数放在AppDelegate中
 static void displayStatusChanged（CFNotificationCenterRef center，
 void * observer，
 CFStringRef name，
 const void * object， 
 CFDictionaryRef userInfo）{
 if（name == CFSTR（com.apple.springboard.lockcomplete））{
 [[NSUserDefaults standardUserDefaults] setBool：YES forKey：@kDisplayStatusLocked] ; 
 [[NSUserDefaults standardUserDefaults] synchronize]; 
} 
} 
 
 //放在onAppEnterBackground 
 UIApplicationState state = [[UIApplication sharedApplication] applicationState]; 
 if（state == UIApplicationStateInactive）{
 NSLog（@通过锁定屏幕发送到后台）; 
} else if（state == UIApplicationStateBackground）{
 if（！[[NSUserDefaults standardUserDefaults] boolForKey：@kDisplayStatusLocked]）{
 NSLog（@切换到其他应用程序）; 
} else {
 NSLog（@通过锁定屏幕发送到后台）; 
} 
} 
 
 //将这个放在 - （void）applicationWillEnterForeground：（UIApplication *）application 
 [[NSUserDefaults standardUserDefaults] setBool：NO forKey：@ kDisplayStatusLocked]; 
 [[NSUserDefaults standardUserDefaults] synchronize]; 
  

b

I need to do something in applicationDidEnterBackground. But I need to differentiate which user action causes the "enter background": screen lock or home button press.

I was using this code, which is from this post - How to differentiate between screen lock and home button press on iOS5?:

UIApplicationState state = [application applicationState];
if (state == UIApplicationStateInactive) {
    NSLog(@"Sent to background by locking screen");
} else if (state == UIApplicationStateBackground) {
    NSLog(@"Sent to background by home button/switching to other app");
}

It works fine on iOS6. but on iOS7 (both device and simulator), I always get UIApplicationStateBackground, whether the user clicks the home or the lock button.

Does someone have an idea about what could cause this? iOS 7 updates to multi-task background handling? Or some setting of my app (my app's background mode is off)?

And is there an alternative solution?

解决方案

This can help you both on iOS6 & iOS7 :).

When user press lock button you will get a com.apple.springboard.lockcomplete notification.

//new way
//put this in - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),
                                    NULL,
                                    displayStatusChanged,
                                    CFSTR("com.apple.springboard.lockcomplete"),
                                    NULL,
                                    CFNotificationSuspensionBehaviorDeliverImmediately);

//put this function in AppDelegate
static void displayStatusChanged(CFNotificationCenterRef center,
                                 void *observer,
                                 CFStringRef name,
                                 const void *object,
                                 CFDictionaryRef userInfo) {
    if (name == CFSTR("com.apple.springboard.lockcomplete")) {
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"kDisplayStatusLocked"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }
}

//put this in onAppEnterBackground
UIApplicationState state = [[UIApplication sharedApplication] applicationState];
    if (state == UIApplicationStateInactive) {
        NSLog(@"Sent to background by locking screen");
    } else if (state == UIApplicationStateBackground) {
        if (![[NSUserDefaults standardUserDefaults] boolForKey:@"kDisplayStatusLocked"]) {
            NSLog(@"Sent to background by home button/switching to other app");
        } else {
            NSLog(@"Sent to background by locking screen");
        }
    }

//put this in - (void)applicationWillEnterForeground:(UIApplication *)application
[[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"kDisplayStatusLocked"];
[[NSUserDefaults standardUserDefaults] synchronize];

这篇关于在iOS7上区分屏幕锁定和主屏幕按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！