Swift UIButton 图像大小在 BarButtonItem 中失真答案

【问题标题】：Swift UIButton Image size distorted in BarButtonItemSwift UIButton 图像大小在 BarButtonItem 中失真
【发布时间】：2018-10-06 01:12:23
【问题描述】：

我想将UIButton 添加到navigationItem.leftBarButtonItem。我希望 UIButton 成为 24x24px 并缩小图像。但是按钮变形了...如果我将UIImage 更改为较小的图像，一切都很好。 -> 看图片

除了scaleAspectFit，我还能做什么？？

    let userProfilePic = UIButton()
    userProfilePic.frame = CGRect(x: 0, y: 0, width: 24, height: 24)
    userProfilePic.setImage(UIImage(named: "profile_icon.jpg"), for: .normal)
    userProfilePic.contentMode = .scaleAspectFit
    userProfilePic.clipsToBounds = true
    userProfilePic.layer.borderWidth = 0.5
    userProfilePic.layer.borderColor = UIColor.white.cgColor
    userProfilePic.layer.cornerRadius = (userProfilePic.frame.size.width) / 2
    userProfilePic.addTarget(self, action: #selector(goToSettings), for: UIControlEvents.touchUpInside)

    self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: userProfilePic)

谢谢！

【问题讨论】：

标签： swift uibutton uiimage uinavigationbar uibarbuttonitem

【解决方案1】：

试试这个代码

ios 11+ 出现问题，UIBarButtonItem 在 ios 11+ 其他使用框架上使用自动布局

     let userProfilePic = UIButton()
        userProfilePic.frame = CGRect(x: 0, y: 0, width: 24, height: 24)
        userProfilePic.setImage(UIImage(named: "profile_icon.jpg"), for: .normal)
        userProfilePic.contentMode = .scaleToFill
        userProfilePic.clipsToBounds = true
        userProfilePic.layer.borderWidth = 0.5
        userProfilePic.layer.borderColor = UIColor.white.cgColor
        userProfilePic.layer.cornerRadius = (userProfilePic.frame.size.width) / 2

      if #available(iOS 11, *) {
    userProfilePic.widthAnchor.constraint(equalToConstant: 24.0).isActive = true
    userProfilePic.heightAnchor.constraint(equalToConstant: 24.0).isActive = true
      }

      userProfilePic.addTarget(self, action: #selector(goToSettings), for: UIControlEvents.touchUpInside)
        self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: userProfilePic)

【讨论】：