ios - 如何在右侧导航栏项目上设置带背景图片的圆形按钮

Question

我曾尝试将圆形按钮放在 iOS 的右侧导航栏上，但不幸的是，当我使用按钮背景时，它不会使图像变圆，它会显示方形背景图像，但是当我删除图像并将背景颜色放在按钮周围时背景色。我试过的代码:

        let button = UIButton()
        button.frame = CGRectMake(0, 0, 40, 40)
        button.layer.cornerRadius = 0.5 * button.bounds.size.width
        button.setImage(self.myPic, forState: .Normal)            
        let barButton = UIBarButtonItem()
        barButton.customView = button
        self.navigationItem.rightBarButtonItem = barButton

Answer 1

尝试使用此代码..对于带图像的圆形按钮 -

let button = UIButton()
button.frame = CGRectMake(0, 0, 40, 40)
let color = UIColor(patternImage: UIImage(named: "btnImage")!)
button.backgroundColor = color
button.layer.cornerRadius = 0.5 * button.bounds.size.width
let barButton = UIBarButtonItem()
barButton.customView = button
self.navigationItem.rightBarButtonItem = barButton

与实际图像---

   let button = UIButton()
    button.frame = CGRectMake(0, 0, 40, 40)

    let image = UIImage(named: "btnImage")!

    UIGraphicsBeginImageContextWithOptions(button.frame.size, false, image.scale)
    let rect  = CGRectMake(0, 0, button.frame.size.width, button.frame.size.height)
    UIBezierPath(roundedRect: rect, cornerRadius: rect.width/2).addClip()
    image.drawInRect(rect)

    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()


    let color = UIColor(patternImage: newImage)
    button.backgroundColor = color
    button.layer.cornerRadius = 0.5 * button.bounds.size.width
    let barButton = UIBarButtonItem()
    barButton.customView = button
    self.navigationItem.rightBarButtonItem = barButton