一、简单的通知
发送方：仅仅发送通知，不包含发送数据
[[NSNotificationCenter defaultCenter] postNotificationName:@"getTargetJid" object:self];
接受方：开启监听通知
[[NSNotificationCenter defaultCenter] addObserver: self
selector: @selector(AddFriendAndGetrlyOnline)
name: @"getTargetJid"
object: nil];
二、通知加传值
情况一：数据简单
发送方：发送通知，包含发送数据
[[NSNotificationCenter defaultCenter] postNotificationName:@"getIsOnlineInfo" object:self userInfo:@{@"isOnline":@"yesOnline"}];
接受方：开启监听通知
[[NSNotificationCenter defaultCenter] addObserver: self
selector: @selector(getIsOnlineInfo:)
name: @"getIsOnlineInfo"
object: nil];
接收方：提取数据
-(void)getIsOnlineInfo:(NSNotification*)notification
{
NSDictionary *nameDictionary = [notification userInfo];
NSString *isonline = [nameDictionary objectForKey:@"isOnline"];
if ([isonline isEqualToString:@"yesOnline"])
{
[self TESTBtn];
}
if ([isonline isEqualToString:@"noOnlie"])
{
NSLog(@"对方容联云不在线");
}
}
情况二：数据复杂
数据为 字典， 字典里数据是数组；
NSMutableArray * numArr = [[NSMutableArray alloc]initWithCapacity:5];
NSMutableArray * statusArr = [[NSMutableArray alloc]initWithCapacity:5];
NSMutableArray * snArr = [[NSMutableArray alloc]initWithCapacity:5];
NSDictionary *userInfoDic = [NSDictionary dictionaryWithObjectsAndKeys:
numArr,@"mtSwitchNum",
statusArr,@"mtSwitchStatus",
snArr,@"mtSwitchSn",nil];
创建消息对象 发送消息
//创建一个消息对象
NSNotification * notice = [NSNotification notificationWithName:DENGKONG_STATUS_CHANGED object:nil userInfo:@{@"name":userInfoDic}];
//发送消息
[[NSNotificationCenter defaultCenter]postNotification:notice];
接受界面添加观察者
//添加当前类对象为一个观察者，name和object设置为nil，表示接收一切通知
[center addObserver:self selector:@selector(refreshDKView:) name:DENGKONG_STATUS_CHANGED object:nil];
接受界面观察者回调函数
//将获取到的灯的状态进行界面显示
-(void)refreshDKView:(NSNotification*)sender
{
// NSLog(@"%@",sender);
//解析列子 NSDictionary *nameDictionary = [notification userInfo];
NSDictionary *resultDic = [sender userInfo];
NSDictionary * contentDic = [resultDic objectForKey:@"name"];
NSArray * numArr = [contentDic objectForKey:@"mtSwitchNum"];
NSString *a = [numArr objectAtIndex:0];
NSArray * statusArr = [contentDic objectForKey:@"mtSwitchStatus"];
NSString *b = [statusArr objectAtIndex:0];
NSArray * snArr = [contentDic objectForKey:@"mtSwitchSn"];
NSString *c = [snArr objectAtIndex:0];
NSLog(@"值：%@:%@:%@",a,b,c);
}
二、移除监听
[center removeObserver:self];
是删除通知中心保存的调度表一个观察者的所有入口
or
[center removeObserver:self name:UIContentSizeCategoryDidChangeNotification object:nil];
是删除匹配了通知中心保存的调度表中观察者的一个入口
三、常用通知
//音频
AVF_EXPORT NSString *const AVAudioSessionInterruptionNotification //音频中断出现
AVF_EXPORT NSString *const AVAudioSessionRouteChangeNotification //系统的音频线路发生改变
AVF_EXPORT NSString *const AVAudioSessionMediaServicesWereLostNotification //媒体服务终止
AVF_EXPORT NSString *const AVAudioSessionMediaServicesWereResetNotification //媒体服务重新启动
//视频
AVF_EXPORT NSString *const AVPlayerItemTimeJumpedNotification // 播放时间跳跃
AVF_EXPORT NSString *const AVPlayerItemDidPlayToEndTimeNotification // 播放结束
AVF_EXPORT NSString *const AVPlayerItemFailedToPlayToEndTimeNotification // 没能播放到最后
AVF_EXPORT NSString *const AVPlayerItemPlaybackStalledNotification // 播放抛锚
AVF_EXPORT NSString *const AVPlayerItemNewAccessLogEntryNotification // 添加新的访问日志条目
AVF_EXPORT NSString *const AVPlayerItemNewErrorLogEntryNotification // 添加新的错误日志条目
MP_EXTERN NSString *const MPMediaLibraryDidChangeNotification; //媒体库发生改变
MP_EXTERN NSString *const MPMediaPlaybackIsPreparedToPlayDidChangeNotification //后台准备播放发生改变
MP_EXTERN NSString *const MPMoviePlayerScalingModeDidChangeNotification; //视频缩放填充模式发生改变
MP_EXTERN NSString *const MPMoviePlayerPlaybackDidFinishNotification; //媒体播放完成或用户手动退出
MP_EXTERN NSString *const MPMoviePlayerPlaybackStateDidChangeNotification //播放状态改变
MP_EXTERN NSString *const MPMoviePlayerLoadStateDidChangeNotification //媒体网络加载状态改变
MP_EXTERN NSString *const MPMoviePlayerNowPlayingMovieDidChangeNotification //当前播放的媒体内容发生改变
MP_EXTERN NSString *const MPMoviePlayerWillEnterFullscreenNotification //将进入全屏
MP_EXTERN NSString *const MPMoviePlayerDidEnterFullscreenNotification //进入全屏后
MP_EXTERN NSString *const MPMoviePlayerWillExitFullscreenNotification //将要退出全屏
MP_EXTERN NSString *const MPMoviePlayerDidExitFullscreenNotification //退出全屏后
MP_EXTERN NSString *const MPMoviePlayerIsAirPlayVideoActiveDidChangeNotification //当媒体开始通过AirPlay播放或者结束AirPlay
MP_EXTERN NSString *const MPMoviePlayerReadyForDisplayDidChangeNotification //视频显示状态改变
MP_EXTERN NSString *const MPMovieMediaTypesAvailableNotification //确定了媒体可用类型后
MP_EXTERN NSString *const MPMovieSourceTypeAvailableNotification // 确定了媒体来源后
MP_EXTERN NSString *const MPMovieDurationAvailableNotification //确定了媒体播放时长后
MP_EXTERN NSString *const MPMovieNaturalSizeAvailableNotification //确定了媒体的实际尺寸后
MP_EXTERN NSString *const MPMoviePlayerThumbnailImageRequestDidFinishNotification //缩略图请求完成之后
MP_EXTERN NSString *const MPMoviePlayerTimedMetadataUpdatedNotification //同步元数据发生更新
MP_EXTERN NSString *const MPMoviePlayerContentPreloadDidFinishNotification //媒体内容预加载完成
MP_EXTERN NSString *const MPMusicPlayerControllerPlaybackStateDidChangeNotification; //播放状态改变
MP_EXTERN NSString *const MPMusicPlayerControllerNowPlayingItemDidChangeNotification; //播放内容改变
MP_EXTERN NSString *const MPMusicPlayerControllerVolumeDidChangeNotification; //音量发生改变
//拍照/录像
AVF_EXPORT NSString *const AVCaptureDeviceWasConnectedNotification //输入设备已连接
AVF_EXPORT NSString *const AVCaptureDeviceWasDisconnectedNotification //输入设备失去连接
AVF_EXPORT NSString *const AVCaptureDeviceSubjectAreaDidChangeNotification //捕获区域发生改变
AVF_EXPORT NSString *const AVCaptureInputPortFormatDescriptionDidChangeNotification //输入设备端口描述改变
AVF_EXPORT NSString *const AVCaptureSessionRuntimeErrorNotification //媒体会话运行错误
AVF_EXPORT NSString *const AVCaptureSessionDidStartRunningNotification //媒体会话开始运行
AVF_EXPORT NSString *const AVCaptureSessionDidStopRunningNotification //媒体会话停止运行
AVF_EXPORT NSString *const AVCaptureSessionWasInterruptedNotification //媒体会话中断
AVF_EXPORT NSString *const AVCaptureSessionInterruptionEndedNotification //媒体会话中断停止
//常用视图
UIKIT_EXTERN NSString *const UITableViewSelectionDidChangeNotification; //TableView选中发生改变
UIKIT_EXTERN NSString *const UITextFieldTextDidBeginEditingNotification; //TextField开始编辑
UIKIT_EXTERN NSString *const UITextFieldTextDidEndEditingNotification; //TextField发生改变
UIKIT_EXTERN NSString *const UITextFieldTextDidChangeNotification; //TextField结束编辑
UIKIT_EXTERN NSString * const UITextViewTextDidBeginEditingNotification; //TextView开始编辑
UIKIT_EXTERN NSString * const UITextViewTextDidChangeNotification; //TextView发生改变
UIKIT_EXTERN NSString * const UITextViewTextDidEndEditingNotification; //TextView结束编辑
UIKIT_EXTERN NSString *const UIWindowDidBecomeVisibleNotification; //window激活并展示在界面的时候触发
UIKIT_EXTERN NSString *const UIWindowDidBecomeHiddenNotification; //当window隐藏的时候触发
UIKIT_EXTERN NSString *const UIWindowDidBecomeKeyNotification; //当window被设置为keyWindow时触发
UIKIT_EXTERN NSString *const UIWindowDidResignKeyNotification; //当window的key位置被取代时触发
UIKIT_EXTERN NSString *const UIKeyboardWillShowNotification; //键盘将弹出
UIKIT_EXTERN NSString *const UIKeyboardDidShowNotification; //键盘弹出
UIKIT_EXTERN NSString *const UIKeyboardWillHideNotification; //键盘将要隐藏
UIKIT_EXTERN NSString *const UIKeyboardDidHideNotification; //键盘隐藏
UIKIT_EXTERN NSString *const UIKeyboardWillChangeFrameNotification //键盘frame将发生改变
UIKIT_EXTERN NSString *const UIKeyboardDidChangeFrameNotification //键盘frame发生改变后
//日期，时间
FOUNDATION_EXPORT NSString * const NSCalendarDayChangedNotification //日期发生改变
FOUNDATION_EXPORT NSString * const NSSystemClockDidChangeNotification //系统时钟发生改变
FOUNDATION_EXPORT NSString * const NSSystemTimeZoneDidChangeNotification //系统时区发生改变
//线程
FOUNDATION_EXPORT NSString * const NSWillBecomeMultiThreadedNotification; //将变成多线程
FOUNDATION_EXPORT NSString * const NSDidBecomeSingleThreadedNotification; //变成了单线程
FOUNDATION_EXPORT NSString * const NSThreadWillExitNotification; //线程退出
//程序
UIKIT_EXTERN NSString *const UIApplicationDidEnterBackgroundNotification //程序进入后台
UIKIT_EXTERN NSString *const UIApplicationWillEnterForegroundNotification //程序将进入前台
UIKIT_EXTERN NSString *const UIApplicationDidFinishLaunchingNotification; //程序加载完成
UIKIT_EXTERN NSString *const UIApplicationDidBecomeActiveNotification; //程序变成激活状态
UIKIT_EXTERN NSString *const UIApplicationWillResignActiveNotification; //程序将失去激活状态
UIKIT_EXTERN NSString *const UIApplicationDidReceiveMemoryWarningNotification; //接收到内存警告
UIKIT_EXTERN NSString *const UIApplicationWillTerminateNotification; //程序将终止
UIKIT_EXTERN NSString *const UIApplicationSignificantTimeChangeNotification; //新的一天开始或时区发生变化
UIKIT_EXTERN NSString *const UIApplicationWillChangeStatusBarOrientationNotification; //将改变状态栏方向
UIKIT_EXTERN NSString *const UIApplicationDidChangeStatusBarOrientationNotification; //状态栏方向以改变
UIKIT_EXTERN NSString *const UIApplicationWillChangeStatusBarFrameNotification; //将改变状态栏frame
UIKIT_EXTERN NSString *const UIApplicationDidChangeStatusBarFrameNotification; //状态栏frame发生改变
UIKIT_EXTERN NSString *const UIApplicationBackgroundRefreshStatusDidChangeNotification //后台刷新状态改变
UIKIT_EXTERN NSString *const UIApplicationUserDidTakeScreenshotNotification //截屏时触发通知
//硬件设备
UIKIT_EXTERN NSString *const UIDeviceOrientationDidChangeNotification; //设备方向改变
UIKIT_EXTERN NSString *const UIDeviceBatteryStateDidChangeNotification //电池状态改变
UIKIT_EXTERN NSString *const UIDeviceBatteryLevelDidChangeNotification //电池电量改变
UIKIT_EXTERN NSString *const UIDeviceProximityStateDidChangeNotification //距离感应器状态发生改变
//其它
UIKIT_EXTERN NSString *const UILocalNotificationDefaultSoundName //本地通知声音
UIKIT_EXTERN NSString *const UIPasteboardChangedNotification; //粘贴板发生改变
UIKIT_EXTERN NSString *const UIPasteboardRemovedNotification; //粘贴板内容移除
FOUNDATION_EXPORT NSString * const NSUserDefaultsDidChangeNotification; //NSUserDefaults发生改变
FOUNDATION_EXPORT NSString * const NSBundleDidLoadNotification; //bundle加载完成