定义两个宏：
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//监听锁屏事件
#define kNotificationLock CFSTR("com.apple.springboard.lockcomplete")
//监听屏幕状态变化事件
#define kNotificationChange CFSTR("com.apple.springboard.lockstate")
注册达尔文通知：
注意此处CFNotificationCenterAddObserver() 为C的函数，其第三个参数需要传一个回调函数
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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
//监听锁屏事件
CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, screenLockStateChanged, kNotificationLock, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
//监听屏幕状态变化事件
CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, screenLockStateChanged, kNotificationChange, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
return YES;
}
定义一个全局变量stateChaned，用来判断屏幕变化的状态
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@property (nonatomic, assign)BOOL stateChanged;
定义AppDelegate的单例，以便在回调函数中调用stateChanged
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//定义AppDelegate单例
+ (AppDelegate *)sharedDelegate{
return (AppDelegate *)[UIApplication sharedApplication].delegate;
}
实现通知回调函数：
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static void screenLockStateChanged(CFNotificationCenterRef center,void* observer,CFStringRef name,const void* object,CFDictionaryRef userInfo){
NSString* lockstate = (__bridge NSString*)name;
if ([lockstate isEqualToString:(__bridge NSString*)kNotificationLock]) {
[AppDelegate sharedDelegate].stateChanged = YES;
NSLog(@"锁屏");
}
else{
if ([AppDelegate sharedDelegate].stateChanged) {
[AppDelegate sharedDelegate].stateChanged = NO;
}else{
NSLog(@"解锁");
}
}
}
运行效果：
Perfect! 锁屏 解锁只会打印一次。
这样把你的锁屏、解锁时触发的代码放在其中就可以了！