iOS：APNS推送主要代码

首先，在AppDelegate.m 中：

1，注册通知

//[objc] view plaincopyprint?在CODE上查看代码片派生到我的代码片
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    ViewController *mainCtrl=[[ViewController alloc] init];
    self.window.rootViewController=mainCtrl;  

    //注册通知
    if ([UIDevice currentDevice].systemVersion.doubleValue<8.0) {
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeBadge)];
    }
    else {
        [[UIApplication sharedApplication] registerForRemoteNotifications];
        [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge|UIUserNotificationTypeSound|UIUserNotificationTypeAlert categories:nil]];
    }  

    //判断是否由远程消息通知触发应用程序启动
    if (launchOptions) {
        //获取应用程序消息通知标记数（即小红圈中的数字）
        NSInteger badge = [UIApplication sharedApplication].applicationIconBadgeNumber;
        if (badge>0) {
            //如果应用程序消息通知标记数（即小红圈中的数字）大于0，清除标记。
            badge--;
            //清除标记。清除小红圈中数字，小红圈中数字为0，小红圈才会消除。
            [UIApplication sharedApplication].applicationIconBadgeNumber = badge;
            NSDictionary *pushInfo = [launchOptions objectForKey:@"UIApplicationLaunchOptionsRemoteNotificationKey"];  

            //获取推送详情
            NSString *pushString = [NSString stringWithFormat:@"%@",[pushInfo  objectForKey:@"aps"]];
            UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"finish Loaunch" message:pushString delegate:nil cancelButtonTitle:@"cancel" otherButtonTitles:nil, nil nil];
            [alert show];
        }
    }  

    return YES;  

2，注册通知后，获取device token

- (void)application:(UIApplication *)app didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    NSString *token = [NSString stringWithFormat:@"%@", deviceToken];
    NSLog(@"My token is:%@", token);
    //这里应将device token发送到服务器端
}  

- (void)application:(UIApplication *)app didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
    NSString *error_str = [NSString stringWithFormat: @"%@", error];
    NSLog(@"Failed to get token, error:%@", error_str);
}  

3，接收推送通知

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    [UIApplication sharedApplication].applicationIconBadgeNumber=0;
    for (id key in userInfo) {
        NSLog(@"key: %@, value: %@", key, [userInfo objectForKey:key]);
    }
    /* eg.
    key: aps, value: {
        alert = "\U8fd9\U662f\U4e00\U6761\U6d4b\U8bd5\U4fe1\U606f";
        badge = 1;
        sound = default;
    }
     */
    UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"remote notification" message:userInfo[@"aps"][@"alert"] delegate:nil cancelButtonTitle:@"cancel" otherButtonTitles:nil, nil nil];
    [alert show];
}  

注意：app 前台运行时，会调用 remote notification；app后台运行时，点击提醒框，会调用remote notification，点击app 图标，不调用remote notification，没反应；app 没有运行时，点击提醒框，finishLaunching   中，launchOptions 传参，点击app 图标，launchOptions 不传参，不调用remote notification。