ios - 调整自定义导航后退按钮的位置

Question

我使用自定义图像作为导航 Controller 的后退按钮，但问题是该图像未与标题和右侧按钮项正确对齐。我一直试图将后退按钮向下移动几个像素，但没有成功。

extension UINavigationController {

       func addBackButton() {
            let imgBack = UIImage(named: "ic_back")
            navigationBar.backIndicatorImage = imgBack
            navigationBar.backIndicatorTransitionMaskImage = imgBack
            navigationBar.topItem?.backBarButtonItem = UIBarButtonItem(title: "",
                                                                       style: .plain,
                                                                       target: self,
                                                                       action: nil)
        }
}

这就是现在的样子:

如您所见，我需要将后退按钮向下移动一点，任何帮助将不胜感激。

Answer 1

这是我的自定义后退按钮的代码。我在 viewDidLoad() 上添加了下图。也许您需要用图像测试如何正确调整其大小。您可以删除带有标签的部分。

            let backButtonView = UIView(frame: CGRect(x: 0, y: 0, width: 60, height: 44))
            let imageView = UIImageView(image: UIImage(named: "back-arrow"))
            imageView.frame = CGRect(x: -5, y: 11, width: 12, height: 22)
            imageView.image = imageView.image!.withRenderingMode(.alwaysTemplate)
            imageView.tintColor = .blue
            let label = UILabel(frame: CGRect(x: 10, y: 0, width: 40, height: 44))
            label.textColor = .blue
            label.text = "Back"
            backButtonView.addSubview(imageView)
            backButtonView.addSubview(label)
            backButtonView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(backButtonClicked)))
            let barButton = UIBarButtonItem(customView: backButtonView)
            navigationItem.leftBarButtonItem = barButton