系统通知

iOS系统可支持本地通知和远程通知,一个通知在客户端收到的时候可能是一个通知窗体,可能会播放一段通知声音,还有可能在程序图标上增加一个数字,还有可能三者皆有。

一、键盘

1、UIKeyboardWillShowNotification-将要弹出键盘

2、UIKeyboardDidShowNotification-显示键盘

3、UIKeyboardWillHideNotification-将要隐藏键盘

4、UIKeyboardDidHideNotification-键盘已经隐藏

5、UIKeyboardWillChangeFrameNotification-键盘将要改变frame

6、UIKeyboardDidChangeFrameNotification-键盘已经改变frame

二、窗口

1、UIWindowDidBecomeVisibleNotification-窗口可见

2、UIWindowDidBecomeHiddenNotification-窗口隐藏

3、UIWindowDidBecomeKeyNotification

4、UIWindowDidResignKeyNotification

三、程序消息

1、UIApplicationDidBecomeActiveNotification-程序从后台激活

2、UIApplicationDidChangeStatusBarFrameNotification-状态栏frame改变

3、UIApplicationDidChangeStatusBarOrientationNotification-状态栏方向改变

4、UIApplicationDidEnterBackgroundNotification-进入后台

5、UIApplicationDidFinishLaunchingNotification-程序加载完成

6、UIApplicationDidReceiveMemoryWarningNotification-内存警告

7、UIApplicationProtectedDataDidBecomeAvailable

8、UIApplicationProtectedDataWillBecomeUnavailable

9、UIApplicationSignificantTimeChangeNotification重要的时间变化(新的一天开始或时区变化)

10、UIApplicationWillChangeStatusBarOrientationNotification-将要改变状态栏方向

11、UIApplicationWillChangeStatusBarFrameNotification-将要改变状态栏frame

12、UIApplicationWillEnterForegroundNotification

13、UIApplicationWillResignActiveNotification

14、UIApplicationWillTerminateNotification

四、电池、方向、传感器

1、UIDeviceBatteryLevelDidChangeNotification//电池电量

2、UIDeviceBatteryStateDidChangeNotification//电池状态

3、UIDeviceOrientationDidChangeNotification//方向

4、UIDeviceProximityStateDidChangeNotification//近距离传感器

五、音视频

1、MPMediaLibraryDidChangeNotification

2、MPMusicPlayerControllerPlaybackStateDidChangeNotification

3、MPMusicPlayerControllerNowPlayingItemDidChangeNotification

4、MPMusicPlayerControllerVolumeDidChangeNotification

六、其他

1、NSUserDefaultsDidChangeNotification用户默认设置变化

2  NSCurrentLocaleDidChangeNotification本地化语言变化


第一个知识点:准备个人定制音频作为提示音,

请注意下面四个小问题-----

1,

系统能播放的四种音频数据格式

Linear PCM

MA4 (IMA/ADPCM)

µLaw

aLaw

对应的后缀名可以是aiff, wav, or caf file. Then,

2, 可以用afconvert来转换音频,例如把16位的线性PCM系统音频格式文件 Submarine.aiff 转换成IMA4音频,存为.CAF文件。

在终端执行即可

afconvert /System/Library/Sounds/Submarine.aiff ~/Desktop/sub.caf -d ima4 -f caff -v

3, 如何确定音频格式呢。

打开QuickTime Player-> Movie menu->Show Movie Inspector

4, 个人定制音频必须是30s以下。否则就播放默认的声音了。


第二个知识点:预定一个Local Notification

需要了解下面5个步骤

1, Allocate 和 initialize 一个 UILocalNotification对象。

2, fireDate属性赋值

3, 设置别的几个体型要素 提示框,提示音,图标上的提示数字。也可以带别的个性化数据:通过userInfo带出去。

4, 然后Schedule这个通知。通过UIApplication.scheduleLocalNotification来预定执行或者立马执行presentLocalNotificationNow:

5, 也可以取消这个通知。用这个方法:cancelLocalNotification和cancelAllLocalNotifications这个方法

以下为系统通知应用,在键盘弹出时,使键盘不会覆盖textField

{

UITextField*tempTF;

}

@end

@implementationViewController

- (void)viewDidLoad {

[superviewDidLoad];

//注册viewController为监听者,并向通知中心发送信息

[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardShow:)name:UIKeyboardWillShowNotificationobject:nil];

[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardHidden:)name:UIKeyboardWillHideNotificationobject:nil];

}

#pragma mark ----实现键盘弹出的方法----

//实现keyboardShow方法

-(void)keyboardShow:(NSNotification*)sender{

//打印useInfo获取键盘尺寸

NSLog(@"%@",sender.userInfo);

/*

UIKeyboardAnimationCurveUserInfoKey = 7;

UIKeyboardAnimationDurationUserInfoKey = "0.25";

UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {320, 253}}";

UIKeyboardCenterBeginUserInfoKey = "NSPoint: {160, 694.5}";

UIKeyboardCenterEndUserInfoKey = "NSPoint: {160, 441.5}";

UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 568}, {320, 253}}";

UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 315}, {320, 253}}";

UIKeyboardIsLocalUserInfoKey = 1;

*/

NSValue*rect =sender.userInfo[UIKeyboardFrameEndUserInfoKey];

//获取键盘高度

CGFloatkeyboardHeight= [rectCGRectValue].size.height;

//获取屏幕尺寸

CGFloatscreen_height= [[UIScreenmainScreen]bounds].size.height;

CGFloatscreen_width = [[UIScreenmainScreen]bounds].size.width;

CGFloatresult = screen_height - keyboardHeight;

//判断键盘是否挡住textField

if(result

//改变view的位置

self.view.frame=CGRectMake(0, result-tempTF.frame.origin.y-tempTF.frame.size.height,screen_width, screen_height);

}

}

//实现keyboardHidden方法

-(void)keyboardHidden:(NSNotification*)sender{

CGFloatscreen_height = [[UIScreenmainScreen]bounds].size.height;

CGFloatscreen_width = [[UIScreenmainScreen]bounds].size.width;

//View恢复原位置

self.view.frame=CGRectMake(0,0, screen_width, screen_height);

}

#pragma mark ----实现textField的代理方法----

-(BOOL)textFieldShouldBeginEditing:(UITextField*)textField{

//将textField设置为当前tempTF

tempTF=textField;

returnYES;

}

//按return键盘消失

-(BOOL)textFieldShouldReturn:(UITextField*)textField{

return[textFieldresignFirstResponder];

}

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