swift 如何删除代码创建的按钮中的空 space？

Question

如何删除代码创建的按钮中的空space？尝试使用插图和约束但没有解决方案。

示例：

        let myButton = UIButton()
        myButton.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(myButton)
        myButton.backgroundColor = .lightGray
        myButton.centerYAnchor.constraint(equalTo: self.view.centerYAnchor).isActive = true
        myButton.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
        myButton.heightAnchor.constraint(equalToConstant: 50).isActive = true //this should be not hardcoded but flexible
        myButton.widthAnchor.constraint(equalToConstant: 200).isActive = true //this should be not hardcoded but flexible
        let downImage = UIImage(named: "caring")
        myButton.imageView?.backgroundColor = .green
        myButton.imageView?.contentMode = .scaleToFill
        myButton.setTitle("Medium Text", for: .normal)
        myButton.setImage(downImage, for: .normal)
        myButton.semanticContentAttribute = .forceRightToLeft
        myButton.imageEdgeInsets = .init(top: 0, left: 16, bottom: 0, right: 0)
//        myButton.imageView?.translatesAutoresizingMaskIntoConstraints = false
//        myButton.imageView?.widthAnchor.constraint(equalToConstant: 24).isActive = true
//        myButton.imageView?.heightAnchor.constraint(equalToConstant: 24).isActive = true
//        myButton.imageView?.centerYAnchor.constraint(equalTo: self.view.centerYAnchor).isActive = true
//        myButton.imageView?.trailingAnchor.constraint(equalTo: myButton.trailingAnchor, constant: 0).isActive = true
//        myButton.contentEdgeInsets.right = 0
//        myButton.contentEdgeInsets.top = 0
//        myButton.contentEdgeInsets.bottom = 0
//
        myButton.titleEdgeInsets.left = 16
        myButton.titleEdgeInsets.right = 16

Answer 1

您可以使用以下步骤来实现此目的。

 //        step 1: Setup the button
    let myButton = UIButton()
    myButton.translatesAutoresizingMaskIntoConstraints = false
    myButton.backgroundColor = .lightGray
    myButton.setTitle("Medium Text", for: .normal)
    myButton.backgroundColor = .lightGray
//        step 2: Set the imageView Of the button
    let downImage = UIImage(named: "caring")
    myButton.imageView?.backgroundColor = .green
    myButton.imageView?.contentMode = .scaleToFill
    myButton.setImage(downImage, for: .normal)
    myButton.semanticContentAttribute = .forceRightToLeft
//        step 3: Here set up the button frames and add the button to the view
    myButton.sizeToFit()
    self.view.addSubview(myButton)
    myButton.centerYAnchor.constraint(equalTo: self.view.centerYAnchor).isActive = true
    myButton.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true

There is no need to set the height and the width anchor which you set in your code.

swift 如何删除代码创建的按钮中的空 space？

swift how to remove empty space in button created by code?

alert

uibutton

swift