UIApplicationLaunchOptionsRemoteNotificationKey没有获取userinfo

Question

在我当前的项目中,我有一个推送通知.当我点击应用程序图标时,我想从启动选项对象获取收到的通知,但它总是返回nil:

NSDictionary *userInfo = [launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey];

Answer 1

您无法检测到这种情况,因为应用程序未使用推送通知打开(它已通过应用程序图标打开).
尝试通过滑动推送通知来打开应用程序.

编辑:

如果您希望调用推送通知(通过后台获取,当您的应用程序未处于活动状态时),您需要让后端开发人员设置"content-available": 1推送通知.

之后-application:didReceiveRemoteNotification:fetchCompletionHandler:将调用(当推送通知到达时),因此您可以将有效负载保存到文件中,然后当应用程序打开时,您可以读取文件并执行操作.

- (void)application:(UIApplication *)application
didReceiveRemoteNotification:(NSDictionary *)userInfo
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
    NSLog(@"#BACKGROUND FETCH CALLED: %@", userInfo);
    // When we get a push, just writing it to file
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"userInfo.plist"];

    [userInfo writeToFile:filePath atomically:YES];
    completionHandler(UIBackgroundFetchResultNewData);
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Checking if application was launched by tapping icon, or push notification
    if (!launchOptions[UIApplicationLaunchOptionsRemoteNotificationKey]) {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"userInfo.plist"];

        [[NSFileManager defaultManager] removeItemAtPath:filePath
                                                   error:nil];
        NSDictionary *info = [NSDictionary dictionaryWithContentsOfFile:filePath];
        if (info) {
            // Launched by tapping icon
            // ... your handling here
        }
    } else {
        NSDictionary *info = launchOptions[UIApplicationLaunchOptionsRemoteNotificationKey];
        // Launched with swiping
        // ... your handling here
    }
    return YES;
}

另外,不要忘记在"后台模式"中启用"远程通知"

Answer 2

从PUSH NOTIFICATION ACTION启动应用程序时,[launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey]将返回推送通知有效负载(以字典格式).当我说推送通知操作时,它意味着从操作中心或推送通知警告对话框中点击推送通知(根据设备设置,推送通知传送机制会有所不同).

如果通过点击APP ICON启动应用程序,则[launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey]始终返回nil.因为,它还没有从任何类型的推送通知中启动.