application 代理方法

关于appdelegate 的一些代理方法

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //设置rootVC  和一些操作
    //1
    return YES;
}


- (void)applicationWillResignActive:(UIApplication *)application {

    
       NSLog(@"\n 2: ===> 程序暂行 !");
}


- (void)applicationDidEnterBackground:(UIApplication *)application {
    
       NSLog(@"\n 3: ===> 程序进入后台 !");
}


- (void)applicationWillEnterForeground:(UIApplication *)application {
    
       NSLog(@"\n 4: ===> 程序进入前台 !");
}


- (void)applicationDidBecomeActive:(UIApplication *)application {

    NSLog(@"\n 5: ===> 程序重新激活 !");
    
}


- (void)applicationWillTerminate:(UIApplication *)application {

       NSLog(@"\n 6: ===> 程序意外暂行 !");
}

第一次运行出来走 1，5 ：
didFinishLaunchingWithOptions ，applicationDidBecomeActive

进入后台 : 2,3
applicationWillResignActive,applicationDidEnterBackground

重新打开 ：4，5
applicationWillEnterForeground，applicationDidBecomeActive