如何在didReceiveRemoteNotification中展示视图并传递推送数据？

我需要在App接收静默推送通知时，展示一个自定义视图，并将推送携带的数据传递给该视图。目前已完成推送数据的解析与存储逻辑，现有代码如下：

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void)
{
    printLog("Did Receive Remote Notification")
    printLog(userInfo)
    do {
        let jsonResult = try JSONSerialization.data(withJSONObject: userInfo)
        let push = try JSONDecoder().decode(RequestPushModel.self, from: jsonResult)
        
        let single = RequestBearerCustomer(type: "\(push.type)", transport_id: "\(push.transport_id)", shortened_origin_address: "\(push.shortened_origin_address)", origin_lat: "\(push.origin_lat)", origin_lng: "\(push.origin_lng)", time: "\(push.time)", price: "\(push.price)", expire_time: "\(push.expire_time)")
        if Constants.requestBearerCustomer.count > 0 {
            Constants.requestBearerCustomer.insert(single, at: Constants.requestBearerCustomer.count - 1)
        } else {
            Constants.requestBearerCustomer.insert(single, at: 0)
        }
        printLog(single)
        printLog(Constants.requestBearerCustomer[0])
    } catch {
        printLog(error)
    }
}

实现步骤 #

1. 确认静默推送配置有效性

静默推送的payload必须包含content-available: 1，且不能包含alert、sound等会触发系统通知栏的字段。同时需在App的Capabilities中开启Background Modes下的Remote notifications选项，确保App能在后台接收推送并被唤醒。

2. 修改推送回调，添加视图触发逻辑

在原回调中加入主线程执行的视图展示逻辑，并正确调用completionHandler（这对后台推送的后续处理至关重要）：

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    printLog("Did Receive Remote Notification")
    printLog(userInfo)
    do {
        let jsonResult = try JSONSerialization.data(withJSONObject: userInfo)
        let push = try JSONDecoder().decode(RequestPushModel.self, from: jsonResult)
        
        let single = RequestBearerCustomer(type: "\(push.type)", transport_id: "\(push.transport_id)", shortened_origin_address: "\(push.shortened_origin_address)", origin_lat: "\(push.origin_lat)", origin_lng: "\(push.origin_lng)", time: "\(push.time)", price: "\(push.price)", expire_time: "\(push.expire_time)")
        
        // 更新本地数据存储
        if Constants.requestBearerCustomer.count > 0 {
            Constants.requestBearerCustomer.insert(single, at: Constants.requestBearerCustomer.count - 1)
        } else {
            Constants.requestBearerCustomer.insert(single, at: 0)
        }
        
        // 主线程触发视图展示，避免UI操作异常
        DispatchQueue.main.async {
            self.showCustomPushView(with: push)
        }
        
        // 根据处理结果返回对应状态
        completionHandler(.newData)
    } catch {
        printLog(error)
        completionHandler(.failed)
    }
}

3. 实现自定义视图展示方法

编写专门的方法来创建并展示自定义视图，适配App前台/后台唤醒后的窗口状态：

private func showCustomPushView(with pushData: RequestPushModel) {
    // 实例化自定义视图，传入推送数据
    let customPushView = CustomPushNotificationView()
    customPushView.pushData = pushData // 假设视图类有接收数据的属性
    customPushView.frame = UIScreen.main.bounds
    
    // 获取当前活跃的主窗口
    guard let keyWindow = UIApplication.shared.windows.first(where: { $0.isKeyWindow }) else {
        return
    }
    
    // 添加视图到窗口并添加淡入动画
    keyWindow.addSubview(customPushView)
    customPushView.alpha = 0
    UIView.animate(withDuration: 0.3) {
        customPushView.alpha = 1
    }
}

4. 后台唤醒场景注意事项

当App从后台被静默推送唤醒时，UIApplication.shared.windows可能需要延迟获取（比如等待App完成启动流程），可根据实际情况添加短暂延迟或监听UIApplication.didBecomeActiveNotification通知，确保视图能正常添加到窗口。

内容的提问来源于stack exchange，提问作者mohammadgdz