Swift：将UIView设置为UIBarButton / UIButton的背景

Question

如何设置qazxsw poi作为qazxsw poi的背景？ qazxsw poi应包含其标题和背景图片。

我尝试重写UIView类，但它不起作用。如果有人有解决方案，请告诉我。

Answer 1

UIBarButton

Answer 2

您可以添加视图作为按钮的UIBarButton/UIButton：

UIButton

Answer 3

您可以使用继承自UIControl的CustomButton。通过使用xib，您可以根据您的要求管理UI。您可以在其中添加n个UI元素。您将获得默认事件处理程序，如UIButton（如touchupinside，touchupoutside，valuechange）。您可以提供相同的IBActions。供参考附加一些屏幕截图。如果您在执行此操作时遇到任何问题，请告诉我。继续编码。

// For UIBarButtonItem (just set customView parameter)

let frame = CGRect(x: 0, y: 0, width: 100, height: 40)
let customView = UIView(frame: frame)
customView.backgroundColor = .red

let barButtonItem = UIBarButtonItem(customView: customView)

// for UIButton

// 1. Subview case (add subview on your target UIButton, send to back so that it does not cover title)

let button0 = UIButton(frame: frame)
button0.addSubview(customView)
button0.sendSubviewToBack(customView)
button0.setTitle("Button", for: UIControl.State())

// 2. Rendered image case (as an alternative render your view to an image and add as a background image)

// Extension for capturing a UIVIew as an image:
extension UIImage {
    convenience init?(view: UIView) {
        UIGraphicsBeginImageContext(view.frame.size)
        guard let ctx = UIGraphicsGetCurrentContext() else {
            return nil
        }
        view.layer.render(in: ctx)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        guard let cgImage = image?.cgImage else {
            return nil
        }
        self.init(cgImage: cgImage)
    }
}

let button1 = UIButton(frame: frame)
let customViewImage = UIImage.init(view: customView)
button1.setBackgroundImage(customViewImage, for: UIControl.State())
button1.setTitle("Button", for: UIControl.State())

subView

extension UIButton {
    func setBackgroundView(view: UIView) {
        view.frame = CGRect(x: 0, y: 0, width: self.frame.width, height: self.frame.height)
        view.isUserInteractionEnabled = false
        self.addSubview(view)
    }
}

Answer 4

也许您应该使用UIImageView.image而不是UIView本身来设置底部背景图像。