backBarButtonItem图像右对齐，要居中

Question

我正在尝试将backBarButtonItem设置为具有自定义映像：

self.navigationItem.backBarButtonItem = UIBarButtonItem(image: UIImage(named: "Back"), style: .plain, target: self, action: #selector(self.navigationController?.popViewController(animated:)))
self.navigationItem.backBarButtonItem?.tintColor = UIColor.red

我注意到，当我为我的backBarButtonItem设置navigationController时，图像会在backBarButtonItem的框架内正确地对齐：

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我能做什么使图像中心，甚至左对齐？

Answer 1

而不是backBarButtonItem，您需要设置leftBarButtonItem

替换此

self.navigationItem.backBarButtonItem = UIBarButtonItem(image: UIImage(named: "Back"), style: .plain, target: self, action: #selector(self.navigationController?.popViewController(animated:)))
self.navigationItem.backBarButtonItem?.tintColor = UIColor.red

由这个

self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: UIImage(named: "Back"), style: .plain, target: self, action: #selector(self.navigationController?.popViewController(animated:)))
self.navigationItem.leftBarButtonItem?.tintColor = UIColor.red