【iOS Tips】锁屏/解锁事件监听的优化-优快云博客

本文介绍如何使用Objective-C在iOS应用中监测设备的锁屏和解锁事件。通过注册特定的通知并实现回调函数来更新应用状态，确保相关事件只被处理一次。

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定义两个宏：

//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

- (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

@property (nonatomic, assign)BOOL stateChanged;

定义AppDelegate的单例，以便在回调函数中调用stateChanged

//定义AppDelegate单例
+ (AppDelegate *)sharedDelegate{
    return (AppDelegate *)[UIApplication sharedApplication].delegate;
    
}

实现通知回调函数：

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");
        }
    }
    
}