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 = "U8fd9U662fU4e00U6761U6d4bU8bd5U4fe1U606f"; 
        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。