iOS自定义NavigationBar

在iOS中，可以通过以下方式自定义NavigationBar：

1. 设置NavigationBar的背景色和透明度

// 设置NavigationBar的背景色
navigationController?.navigationBar.barTintColor = UIColor.red

// 设置NavigationBar的透明度
navigationController?.navigationBar.isTranslucent = true

2. 设置NavigationBar的标题和字体样式

// 设置NavigationBar的标题
navigationItem.title = "Custom Title"

// 设置NavigationBar的字体样式
navigationController?.navigationBar.titleTextAttributes = [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 18), NSAttributedString.Key.foregroundColor: UIColor.white]

3. 设置NavigationBar的返回按钮和图片

// 设置NavigationBar的返回按钮
let backButton = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
navigationItem.backBarButtonItem = backButton

// 设置NavigationBar的返回图片
let backImage = UIImage(named: "back")
navigationController?.navigationBar.backIndicatorImage = backImage
navigationController?.navigationBar.backIndicatorTransitionMaskImage = backImage

4. 隐藏NavigationBar

// 隐藏NavigationBar
navigationController?.navigationBar.isHidden = true

5. 自定义NavigationBar的左右按钮

// 自定义NavigationBar的左按钮
let leftButton = UIBarButtonItem(title: "Left", style: .plain, target: self, action: #selector(leftButtonTapped))
navigationItem.leftBarButtonItem = leftButton

// 自定义NavigationBar的右按钮
let rightButton = UIBarButtonItem(title: "Right", style: .plain, target: self, action: #selector(rightButtonTapped))
navigationItem.rightBarButtonItem = rightButton

// 左按钮点击事件
@objc func leftButtonTapped() {
    // do something
}

// 右按钮点击事件
@objc func rightButtonTapped() {
    // do something
}