获取 rightBarButtonItem 的字体大小

Question

我将为 rightBarButtonItem 使用自定义字体，但我想获取用于将该大小设置为自定义字体大小的当前字体大小。

let myButton = UIBarButtonItem(title: "Button",
                               style: .plain,
                               target: self,
                               action:#selector(MyVC.buttonTapped(_:)))

navigationItem.rightBarButtonItem = myButton

let size = myButton...???

myButton.setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: "SomeCustomFont", size: size)! ], for: .normal)

有什么想法吗？还是其他方法？

Answer 1

你可以得到UIBarButtonItem的大小如下：

 if let buttonItemView = self.navigationItem.leftBarButtonItem?.value(forKey: "view") as? UIView{
        let buttonItemsize = buttonItemView.frame.size
        //your code
    }