获取 APNs（通知） 推送内容

1、判断如何启动App

---

启动App时会自动调用didFinishLaunchingWithOptions方法：如果launchOptions包含UIApplicationLaunchOptionsRemoteNotificationKey ,则表示用户是通过点击APNs 启动App；
如果不含有对应键值，则表示用户可能是直接点击icon启动App。

- (BOOL)application:(UIApplication *)application
    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// apn 内容获取：NSDictionary *remoteNotification = [launchOptions objectForKey: UIApplicationLaunchOptionsRemoteNotificationKey]
...
}

2、APNs获取接口

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1 ) iOS 6 及以下的系统版本:

如果 App在前台运行收到APNs或者App处于后台运行时点击收到的APNs通知会触发以下接口：

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo;
 // apn内容为userInfo

2 ) iOS 7 及以上的系统版本:

如果 App在前台运行收到APNs 或者 App处于后台运行时点击收到的APNs通知 或者（开启了background功能）后台收到background 通知会触发以下接口：

 - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler; 
// apn内容为userInfo

3 )iOS 10及以上的系统版本：

( 1 ) 和( 2 ) 点说到的通知获取方法由以下两个代理方法替代：

- (void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler 
    __IOS_AVAILABLE(10.0) __TVOS_AVAILABLE(10.0) __WATCHOS_AVAILABLE(3.0);

- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void(^)())completionHandler
    __IOS_AVAILABLE(10.0) __WATCHOS_AVAILABLE(3.0) __TVOS_PROHIBITED;

3、示例代码：

 // iOS 6 Remote Notificatio
 - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
        // 取得 APNs 标准信息内容
        NSDictionary *aps = [userInfo valueForKey:@"aps"];
        NSString *content = [aps valueForKey:@"alert"]; //推送显示的内容
        NSInteger badge = [[aps valueForKey:@"badge"] integerValue]; //badge数量
        NSString *sound = [aps valueForKey:@"sound"]; //播放的声音
         
        // 取得Extras字段内容
        NSString *customizeField1 = [userInfo valueForKey:@"customizeExtras"]; //服务端中Extras字段，key是自己定义的
        NSLog(@"content =[%@], badge=[%d], sound=[%@], customize field  =[%@]",content,badge,sound,customizeField1);
     
    }

    //iOS 7 Remote Notification
    - (void)application:(UIApplication *)application didReceiveRemoteNotification:  (NSDictionary *)userInfo fetchCompletionHandler:(void (^)   (UIBackgroundFetchResult))completionHandler {
     
        NSLog(@"this is iOS7 Remote Notification");
         
        // iOS 10 以下 Required
        if ([[UIDevice currentDevice].systemVersion floatValue] < 10.0) {
            //iOS10以下的通知处理代码
            return;
        }
        completionHandler(UIBackgroundFetchResultNewData);
    }

//iOS10新增：处理前台收到通知的代理方法
   -(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler{
    NSDictionary * userInfo = notification.request.content.userInfo;

    if([notification.request.trigger isKindOfClass:[UNPushNotificationTrigger class]]) {
        NSLog(@"--ios10 官方-前台收到push通知：%@",userInfo);
     
    }else{

        NSLog(@"--ios10 官方-前台收到本地通知:{\n body：%@,\n title:%@,subtitle:%@,badge:%@,\nsound:%@,\nuserinfo:%@\n}",notification.request.content.body,notification.request.content.title,notification.request.content.subtitle, notification.request.content.badge,notification.request.content.sound,userInfo);
    }
 completionHandler(UNNotificationPresentationOptionBadge|UNNotificationPresentationOptionSound|UNNotificationPresentationOptionAlert);
}

//iOS10新增：处理后台点击通知的代理方法
-(void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)())completionHandler{
    NSDictionary * userInfo = response.notification.request.content.userInfo;
    if([response.notification.request.trigger isKindOfClass:[UNPushNotificationTrigger class]]) {
        NSLog(@"--ios10 官方-后台收到push通知：%@",userInfo);

    }else{
        NSLog(@"--ios10 官方-后台收到本地通知:{\n body：%@,\n title:%@,subtitle:%@,badge:%@,\nsound:%@,\nuserinfo:%@\n}",response.notification.request.content.body,response.notification.request.content.title,response.notification.request.content.subtitle, response.notification.request.content.badge,response.notification.request.content.sound,userInfo);

    }
        completionHandler();
    
}

4、补充说明：

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1)获取App 运行状态：

 UIApplicationState state = [UIApplication sharedApplication].applicationState;

说明：
UIApplication.h
ypedef NS_ENUM(NSInteger, UIApplicationState) {
    UIApplicationStateActive,
    UIApplicationStateInactive,
    UIApplicationStateBackground
} NS_ENUM_AVAILABLE_IOS(4_0);

2)iOS 10使用代理方法需要在delegate添加代理，如：

//Apple官方 - iOS 10 新增的delegate：
@interface AppDelegate ()<UNUserNotificationCenterDelegate>

//Apple官方 - iOS10 APNs注册：
UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
    [center requestAuthorizationWithOptions:(UNAuthorizationOptionSound|UNAuthorizationOptionAlert|UNAuthorizationOptionBadge) completionHandler:^(BOOL granted, NSError * _Nullable error) {
        if (granted) {
            [[UIApplication sharedApplication] registerForRemoteNotifications];
        }
    }];
    
    center.delegate = self;

ps：此文档在JPush官方文档【获取APNs（通知）内容】的基础上修改。