将UIImagePickerController cameraOverlayView定位在摄像机预览的顶部
将UIImagePickerController cameraOverlayView定位在摄像机预览的顶部
提问于 2021-11-05 20:28:36
我想添加一个覆盖到我的UIImagePickerController，但我只需要它包括相机预览，而不是在顶部或底部的相机控制。我在任何地方都找不到这样的方法，因为在每个设备上，顶部/底部的控制高度是不同的。我以前在其他应用程序上也见过。如有任何指导，将不胜感激。
imagePicker.sourceType = .camera
let overlay = UIView()
overlay.backgroundColor = UIColor(white: 1, alpha: 0.5)
imagePicker.cameraOverlayView!.addSubview(overlay)
// This is using a UIView extension to constrain my views. It's as simple as it looks.
overlay.anchor(top: imagePicker.cameraOverlayView!.topAnchor, left: imagePicker.cameraOverlayView!.leftAnchor, bottom: imagePicker.cameraOverlayView!.bottomAnchor, right: imagePicker.cameraOverlayView!.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 100, height: 100)
self.present(imagePicker, animated: true, completion: nil)我想要这个半透明的UIView只填充红色区域。我没有问题，创建的框架是3:4，但它不会正确地定位在Y轴。imagePicker.cameraOverlayView!.centerYAnchor与设备的centerYAnchor相同。
回答 1
Stack Overflow用户
回答已采纳
发布于 2022-01-27 19:45:57
也许不是最好的解决办法。使用视图调试器，您可以检查视图层次结构。现在将视图添加到子camera view port controller中
imagePicker = CustomPicker()
imagePicker.sourceType = .camera
present(imagePicker, animated: true, completion: nil)
class CustomPicker: UIImagePickerController {
let overlay = UIView()
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if let camController = children.first?.children.first?.children.first, overlay.superview == nil {
overlay.backgroundColor = UIColor(white: 1, alpha: 0.5)
camController.view.addSubview(overlay)
overlay.addPinConstraints(top: 0, left: 0, bottom: 0, right: 0)
}
}
}
extension UIView {
func addPinConstraints(top: CGFloat? = nil, left: CGFloat? = nil, bottom: CGFloat? = nil, right: CGFloat? = nil) {
guard let parent = superview else { return }
translatesAutoresizingMaskIntoConstraints = false
if let left = left {
leadingAnchor.constraint(equalTo: parent.leadingAnchor, constant: left).isActive = true
}
if let right = right {
trailingAnchor.constraint(equalTo: parent.trailingAnchor, constant: -right).isActive = true
}
if let top = top {
topAnchor.constraint(equalTo: parent.topAnchor, constant: top).isActive = true
}
if let bottom = bottom {
bottomAnchor.constraint(equalTo: parent.bottomAnchor, constant: -bottom).isActive = true
}
}
}视图检查器的屏幕截图，这里的子->子->是照相机视图端口。
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原文链接：
https://stackoverflow.com/questions/69858926
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