ios - 强制提前调用 iOS 设备上的后台任务到期处理程序以进行测试

Question

我正在测试和调试 - beginBackgroundTaskWithExpirationHandler: 中的过期 block 。

有没有办法强制调用 Block 以使其更快发生，而不是每次我需要调试时都等待大约 10 分钟？

我对调试 block 中的实际代码不感兴趣，而是对调用顺序和回溯等感兴趣；这就是为什么我需要回调本身发生，但每次 10 分钟太长了!

Answer 1

模拟后台任务时间到期:

1. Start your background task on controller viewDidLoad and Schedule a Timer that prints out the backgroundTimeRemaining every 1 second.
2. Send your app to background.
3. Trigger the action of your background task when the backgroundTimeRemaining is less than X seconds.

可以通过测试何时触发过期处理程序来获知 X。因为不保证 backgroundTimeRemaining 是准确的。

代码:

UIApplication.shared.beginBackgroundTask(withName: "Submit Order Background Task") { [weak self] in
     // Your logic to handle the expiration.
}

// To submit order 1 time!
var submitted = false

Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { (timer) in
    print("background task timer: \(UIApplication.shared.backgroundTimeRemaining)")
        
    if UIApplication.shared.backgroundTimeRemaining < 2 && !submitted {
        self.submitOrder()
        submitted = true
    }
}