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ios app响应background,foreground 事件实现

1 通过AppDelegate 实现

App进入后台事件方法

- (void)applicationDidEnterBackground:(UIApplication *)application

APP进入前台的事件方法

- (void)applicationWillEnterForeground:(UIApplication *)application

 

2UIViewController类中通过对Background ,Foreground事件的通知的侦听,进行实现

举例

- (void) viewWillAppear:(BOOL)animated{  

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillEnterForegroundNotification) name:UIApplicationWillEnterForegroundNotification object:nil];  

}  

- (void) appWillEnterForegroundNotification{  

    NSLog(@"trigger event when will enter foreground.");  

}  

-(void) viewDidDisappear:(BOOL)animated{  

    [[NSNotificationCenter defaultCenter] removeObserver:self];      

}  

注意:在UIViewController类中viewDidUnload方法在ios6以后过期失效

 

posted on 2015-04-26 11:52  狗尾草-大数据收割基  阅读(1241)  评论(0编辑  收藏  举报