您可以使用配置了.InfoLight UIButton的自定义视图,如建议的here：

// Create the info button
let infoButton = UIButton(type: .infoLight)

// You will need to configure the target action for the button itself,not the bar button itemr
infoButton.addTarget(self,action: #selector(getInfoAction),for: .touchUpInside)

// Create a bar button item using the info button as its custom view
let infoBarButtonItem = UIBarButtonItem(customView: infoButton)

// Use it as required
navigationItem.rightBarButtonItem = infoBarButtonItem

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