ios - Swift - UIButton 改变宽度

Question

我遇到一个问题，UIButton 正在改变如果我在同一个 View 中添加另一个按钮它的宽度。

这是没有第二个按钮的样子:

这就是我将第二个按钮(标题:“Wishlist？”)限制在同一个 view 中时的样子:

这就是我创建圆形图像按钮的方式:

let wishButton: UIButton = {
    let v = UIButton()
    v.setBackgroundImage(UIImage(named: "wishButton"), for: .normal)
    v.translatesAutoresizingMaskIntoConstraints = false
    v.addTarget(self, action: #selector(wishButtonTapped), for: .touchUpInside)
    v.contentVerticalAlignment = .fill
    v.contentHorizontalAlignment = .fill
    return v
}()

// constrain wishButton
    wishButton.centerXAnchor.constraint(equalTo: popUpView.centerXAnchor).isActive = true
    wishButton.centerYAnchor.constraint(equalTo: popUpView.centerYAnchor, constant: 70).isActive = true
    wishButton.heightAnchor.constraint(equalToConstant: 72).isActive = true
    wishButton.widthAnchor.constraint(equalToConstant: 72).isActive = true

带标题的第二个按钮:

let dropDownButton: dropDownBtn = {
    let v = dropDownBtn()
    v.setTitle("Wishlist?", for: .normal)
    v.translatesAutoresizingMaskIntoConstraints = false
    return v
}()

        // constrain dropDownButton
    dropDownButton.centerXAnchor.constraint(equalTo: popUpView.centerXAnchor).isActive = true
    dropDownButton.centerYAnchor.constraint(equalTo: popUpView.centerYAnchor).isActive = true
    wishButton.heightAnchor.constraint(equalToConstant: 100).isActive = true
    wishButton.widthAnchor.constraint(equalToConstant: 40).isActive = true

Answer 1

你有冲突

wishButton.heightAnchor.constraint(equalToConstant: 72).isActive = true
wishButton.widthAnchor.constraint(equalToConstant: 72).isActive = true

和

wishButton.heightAnchor.constraint(equalToConstant: 100).isActive = true
wishButton.widthAnchor.constraint(equalToConstant: 40).isActive = true

你可能是说

dropDownButton.heightAnchor.constraint(equalToConstant: 100).isActive = true
dropDownButton.widthAnchor.constraint(equalToConstant: 40).isActive = true