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,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”