swift - UIAlertAction 背景颜色

Question

我的 UIAlertController 有问题，它没有正确显示背景颜色...你能帮我吗？

这是代码:

let alert = UIAlertController(title: "Choose qty", message: "", preferredStyle: UIAlertControllerStyle.alert)
let pickerController = PickerQtyController()
alert.setValue(pickerController, forKey: "contentViewController")
// Testing color
alert.view.tintColor=UIColor.blue
let backView = alert.view.subviews.last?.subviews.last
backView?.layer.cornerRadius = 10.0
backView?.backgroundColor = UIColor.blue
// Btns
let saveBtn = UIAlertAction(title: "Save", style: UIAlertActionStyle.default) {
    UIAlertAction in
    print("UIAlertController: Saved")
    pickerController.saveNewValueOfPicker()
}
let cancelBtn = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel) {
    UIAlertAction in
    print("UIAlertController: Canceled")
}
alert.addAction(saveBtn)
alert.addAction(cancelBtn)
self.present(alert, animated: true)

谢谢!

Answer 1

这是丑陋且错误的设计。您应该创建一个自定义 View Controller 并将您的选择 Controller 添加到其中。将背景更改为透明并将模态呈现样式设置为覆盖当前上下文以显示自定义 View Controller 。

self.modalPresentationStyle = UIModalPresentationStyle.OverCurrentContext