[已解决]swift中图像实现圆角和徽标不被截断

[背景]

想要实现这种效果:
want to image corner radius effect
但是代码:
            drawedCustomHeaderImage = drawConversationHeaderImage(CGSizeMake(SIZE_CONVERSATION_HEADER, SIZE_CONVERSATION_HEADER))

            let headerLabel = UILabel(frame: CGRectMake(
                0,
                0,
                drawedCustomHeaderImage.size.width,
                drawedCustomHeaderImage.size.height))
            headerLabel.font = FONT_CONVERSATION_HEADER
            headerLabel.textColor = UIColor.whiteColor()
            headerLabel.text = "简"
            headerLabel.textAlignment = NSTextAlignment.Center

            let headerImageView = UIImageView(image: drawedCustomHeaderImage)
            headerImageView.addSubview(headerLabel)

            let badgeView = drawBadgeView("2")
            badgeView.frame.origin.x = headerImageView.frame.size.width
                - badgeView.frame.width + 4
            badgeView.frame.origin.y -= 2

            cell.imageView?.image = headerImageView.image
            cell.imageView?.addSubview(headerImageView)
            cell.imageView?.layer.cornerRadius = 4
            cell.imageView?.clipsToBounds = true
            cell.imageView?.addSubview(badgeView)
效果却是:
badage right up corner and clip
即,badge的值部分的内容,被clipsToBounds截掉了。
现象希望实现:
imageView,可以是圆角
然后右上角的badge的值,也是可以正常显示,没有被截掉的
试了很多种:
(1)
            headerImageView.layer.cornerRadius = 4
            headerImageView.clipsToBounds = true

//            cell.imageView?.layer.cornerRadius = 4
//            cell.imageView?.clipsToBounds = true
 但是结果是:
badge ok but not corner radius
即,没有实现圆角。
(2)
            headerImageView.clipsToBounds = false
没用。
后来,突然看出来:
好像是此处是:
            cell.imageView?.image = headerImageView.image
导致的:
此处的:
headerImageView
看来是圆角了。但是:
headerImageView.image
还是直角的图片,
然后赋值给了cell的imageView
搜:
swift UIImageView cornerRadius not work
参考:
搜:
swift make UIImage round corner
参考:
uiimageview – How do I make an UIImage/-View with rounded corners CGRect (Swift) – Stack Overflow
实在不行的话,到时候再去:
画圆角的矩形
搜:
swift make UIImage round corner mask
 参考:
算了,就去加clip吧:
画出本身就是圆角矩形的image:
搜:
uibezierpath 圆角
参考:
//given an image, clip the round corner, return a round corner image
func drawCornerImage(image:UIImage, cornerRadius:CGFloat) -> UIImage {
    let clippedCornerImage:UIImage

    let tmpImageView = UIImageView(image: image)
    let opaque:Bool = false
    //let scale:CGFloat = 1.0 //will cause round corner not clear == blur
    let scale:CGFloat = 0.0

    // Begin a new image that will be the new image with the rounded corners
    // here with the size of an UIImageView
    UIGraphicsBeginImageContextWithOptions(tmpImageView.bounds.size, opaque, scale);

    // Add a clip before drawing anything, in the shape of an rounded rect
    let cornerBezierPath = UIBezierPath(roundedRect: tmpImageView.bounds,
            cornerRadius: cornerRadius)
    cornerBezierPath.addClip()

    // Draw your image
    image.drawInRect(tmpImageView.bounds)

    // Get the clipped image
    clippedCornerImage = UIGraphicsGetImageFromCurrentImageContext();

    // Lets forget about that we were drawing
    UIGraphicsEndImageContext();

    return clippedCornerImage
}

//draw a badge view
func drawBadgeView(badgeString:String) -> UIView {
    let badgeRadius:CGFloat = 9
    let badgeFrame = CGRectMake(0, 0, badgeRadius * 2, badgeRadius * 2)

    let circleLayer = drawCircle(badgeRadius)
    //let badgeView = UIView(frame: CGRectMake(0, 0, badgeRadius*2, badgeRadius*2))
    let badgeView = UIView(frame: badgeFrame)
    badgeView.layer.addSublayer(circleLayer)

    //let badgeLabel:UILabel = UILabel(frame: CGRectMake(0, 0, badgeRadius*2, badgeRadius*2))
    let badgeLabel:UILabel = UILabel(frame: badgeFrame)
    badgeLabel.text = badgeString
    badgeLabel.backgroundColor = UIColor.clearColor()
    badgeLabel.textAlignment = NSTextAlignment.Center
    badgeLabel.font = UIFont.systemFontOfSize(13)
    badgeLabel.textColor = UIColor.whiteColor()

    badgeView.addSubview(badgeLabel)
    badgeView.bringSubviewToFront(badgeLabel)

    return badgeView
}

            let cornerHeaderImage = drawCornerImage(drawedCustomHeaderImage, cornerRadius: 4)
            let headerImageView = UIImageView(image: cornerHeaderImage)

            let badgeView = drawBadgeView("2")
            badgeView.frame.origin.x = headerImageView.frame.size.width
                - badgeView.frame.width + 4
            badgeView.frame.origin.y -= 2
            headerImageView.addSubview(badgeView)

            cell.imageView?.image = headerImageView.image
            cell.imageView?.addSubview(headerImageView)
画出了圆角矩形的image:
can draw corner radius image
并且加上badge后,可以正常完全显示badge:
此时,scale=1.0导致圆角边有点模糊:
corner radiu is some blur.png
不过: scale=0.0或2.0,就使得圆角边很清晰,不模糊了:
scale 0 or 2 corner is clear
注:
更多相关的库函数请移步:
https://github.com/crifan/CrifanUIImage


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