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接收到通知，但它总是返回 nil:

NSDictionary *userInfo = [launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey];

最佳答案

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打开应用程序。

编辑:

如果你想被调用推送通知(通过后台获取，当你的应用程序不活动时)你需要要求你的后端开发人员在推送通知中设置 "content-available": 1 .

之后 -application:didReceiveRemoteNotification:fetchCompletionHandler: 将被调用(当推送通知到达时)，因此您可以将有效负载保存到一个文件中，然后当应用程序打开时，您可以阅读文件并采取行动。

- (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”

关于ios - UIApplicationLaunchOptionsRemoteNotificationKey 没有获取用户信息，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30297594/