如何将边框和圆角半径应用于 UIBarButtonItem? [英] How to apply borders and corner radius to UIBarButtonItem?

问题描述

我以编程方式创建了一个工具栏，并在其中添加了 UIBarButtonItem.

这是目前的样子:

我希望按钮具有边框和圆角半径(弯角).将如何实施?

UIBarButtonItem 实现代码:

let okBarBtn = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Done, target: self, action: "donePressed:")

解决方案

如果你能找到与 UIBarButtonItem 关联的 UIView，你可以修改 UIView.layer.但是，找到 UIView 并不容易.我使用了

I have programatically created a toolbar to which I have added a UIBarButtonItem.

This is what is currently looks like:

I want the the button to have a border and a corner radius(curved corners). How will the same be implemented?

UIBarButtonItem Implementation code:

let okBarBtn = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Done, target: self, action: "donePressed:")

解决方案

If you can find the UIView associated with the UIBarButtonItem, you can modify the UIView.layer. But, finding the UIView is not made easy. I used the technique from Figure out UIBarButtonItem frame in window? . Starting with the navigationController.navigationBar, which itself is a UIView, I recursed through the subviews, one of which will be the button I wanted. Which one? Pick your own criteria! Here's my code:

func recurseViews(view:UIView) {
    print("recurseViews: \(view)") // helpful for sorting out which view is which
    if view.frame.origin.x > 700 { // find _my_ button
        view.layer.cornerRadius = 5
        view.layer.borderColor = UIColor.redColor().CGColor
        view.layer.borderWidth = 2
    }
    for v in view.subviews { recurseViews(v) }
}

then in viewDidAppear (or similar)

recurseViews((navigationController?.navigationBar)!)

which is a bit of a hack but does the job:

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