Differentiate between screen lock and home button press on iOS7

Question

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

Answer 1

It doesn't work in Swift, you need to do some modification to make it work in Swift as follow

1.create a objectiveC file named LockNotifierCallback.m as follow:

static void displayStatusChanged(CFNotificationCenterRef center,
                                 void *observer,
                                 CFStringRef name,
                                 const void *object,
                                 CFDictionaryRef userInfo) {
    if ([(__bridge NSString *)name  isEqual: @"com.apple.springboard.lockcomplete"]) {
        NSLog(@"Screen Locked");
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"kDisplayStatusLocked"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }
}

@implementation LockNotifierCallback

+ (void(*)(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo))notifierProc {
return displayStatusChanged;
}

@end

create a head as well: #import

@interface LockNotifierCallback : NSObject


+ (void(*)(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo))notifierProc;


@end

2.bridge this file to swift

3.add function to APPdelegate.swift:

CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), nil, LockNotifierCallback.notifierProc(), "com.apple.springboard.lockcomplete", nil, CFNotificationSuspensionBehavior.DeliverImmediately)

PS:UIApplicationState doesn't work perfectly in here