Swift - UIButton 改变宽度答案

【问题标题】：Swift - UIButton changes widthSwift - UIButton 改变宽度
【发布时间】：2019-12-14 18:28:24
【问题描述】：

我遇到了一个问题，UIButton 正在更改it's width if I add anotherbuttoninside the sameview`。

这是没有第二个button的样子：

如果我将第二个按钮（标题：“愿望清单？”）限制在同一个 view 内，这就是它的外观：

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

第二个带有标题的按钮：

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

【问题讨论】：

IDK 你如何将它们 X 和 Y 居中并给出这样的外观

标签： ios swift uibutton constraints

【解决方案1】：

你们有冲突

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

你的意思可能是

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

【讨论】：