iOS导航栏左侧按钮左移后左侧区域点击无响应修复咨询

这个问题我之前也碰到过，根源在于你用transform把按钮向左平移15pt后，按钮的容器视图suggestButtonContainer的范围没跟上——它还是用按钮原来的frame创建的，导致按钮左移出去的那部分区域不在容器的 bounds 范围内。而导航栏的UIBarButtonItem是通过它的自定义视图（也就是这个容器）的范围来识别点击区域的，超出容器范围的点击自然不会触发按钮事件。

下面给你几种靠谱的修复方案：

方案1：直接调整按钮在容器内的位置（推荐） #

不用transform平移，直接把按钮的x坐标设为负数，同时扩大容器的宽度来覆盖按钮左移后的全部区域：

let suggestButton = UIButton(type: .custom)
// 直接将按钮的x设为-15，替代transform平移
suggestButton.frame = CGRect(x: -15, y: 0, width: 60, height: 40)
suggestButton.setImage(backImage, for: .normal)
suggestButton.backgroundColor = .green
suggestButton.imageEdgeInsets = UIEdgeInsets(top: 10.0, left: 5.0, bottom: 10.0, right: 35)
suggestButton.addTarget(self, action: #selector(showPopover(sender:)), for: .touchUpInside)

// 容器宽度设为按钮宽度+左移距离，确保覆盖按钮全部区域
let suggestButtonContainer = UIView(frame: CGRect(x: 0, y: 0, width: 60 + 15, height: 40))
suggestButtonContainer.addSubview(suggestButton)

let suggestButtonItem = UIBarButtonItem(customView: suggestButtonContainer)
navigationItem.leftBarButtonItem = suggestButtonItem

方案2：保留transform，但调整容器frame #

如果一定要用transform，可以先计算按钮变换后的实际frame，再把容器的frame设为这个范围，最后重置按钮的transform（让容器来承担位移）：

let suggestButton = UIButton(type: .custom)
suggestButton.frame = CGRect(x: 0, y: 0, width: 60, height: 40)
suggestButton.setImage(backImage, for: .normal)
suggestButton.backgroundColor = .green
suggestButton.imageEdgeInsets = UIEdgeInsets(top: 10.0, left: 5.0, bottom: 10.0, right: 35)
suggestButton.addTarget(self, action: #selector(showPopover(sender:)), for: .touchUpInside)

// 先计算变换后的按钮frame
let transform = CGAffineTransform(translationX: -15, y: 0)
let transformedFrame = suggestButton.frame.applying(transform)

// 容器用变换后的frame
let suggestButtonContainer = UIView(frame: transformedFrame)
suggestButtonContainer.addSubview(suggestButton)
// 重置按钮的transform，让容器的位置来实现左移效果
suggestButton.transform = .identity

let suggestButtonItem = UIBarButtonItem(customView: suggestButtonContainer)
navigationItem.leftBarButtonItem = suggestButtonItem

方案3：给容器添加点击手势转发 #

如果不想调整frame，可以给容器添加点击手势，手动触发按钮的点击事件：

let suggestButton = UIButton(type: .custom)
suggestButton.frame = CGRect(x: 0, y: 0, width: 60, height: 40)
suggestButton.setImage(backImage, for: .normal)
suggestButton.backgroundColor = .green
suggestButton.imageEdgeInsets = UIEdgeInsets(top: 10.0, left: 5.0, bottom: 10.0, right: 35)
suggestButton.addTarget(self, action: #selector(showPopover(sender:)), for: .touchUpInside)
suggestButton.transform = CGAffineTransform(translationX: -15, y: 0)

let suggestButtonContainer = UIView(frame: suggestButton.frame)
suggestButtonContainer.addSubview(suggestButton)

// 给容器添加点击手势，触发按钮的点击逻辑
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(containerTapped))
suggestButtonContainer.addGestureRecognizer(tapGesture)

let suggestButtonItem = UIBarButtonItem(customView: suggestButtonContainer)
navigationItem.leftBarButtonItem = suggestButtonItem

// 手势触发的方法，调用按钮的点击事件
@objc func containerTapped() {
    showPopover(sender: suggestButton)
}

核心逻辑总结：确保UIBarButtonItem的自定义视图（容器）的范围完全覆盖按钮的可点击区域，因为导航栏只会响应自定义视图范围内的点击操作。

内容的提问来源于stack exchange，提问作者DIMPAL BHENDARKAR