我正在模拟器中测试我的应用程序，突然控制台上出现此错误。我不知道它与什么相关 - 无论是 Firebase、本地通知还是其他东西。我在网上也找不到任何有关它的信息。有谁知道这个错误是什么意思？
[BackgroundTask] Background Task 17 ("APMAnalyticsMeasurementBackgroundTask"), was created over 30 seconds ago. In applications running in the background, this creates a risk of termination. Remember to call UIApplication.endBackgroundTask(_:) for your task in a timely manner to avoid this.
每当我单击我创建的选择器视图之一时，控制台都会记录以下错误：
[LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
我知道当存在冲突的约束时通常会发生此错误，但我不知道在这种情况下冲突的约束是什么。pickerview 仍然可以正常工作，但我仍然想摆脱这个错误。
代码：
@IBAction func showDatePicker(_ sender: PickerField){
let …