［已解决］swift中把UIImage中添加UILabel后生成新的UIImage

    func drawCornerHeaderImage(headerCharArr:[String]) -> UIImage {
        print("drawCornerHeaderImage:")
        print("headerCharArr.count=\(headerCharArr.count)")
        print("headerCharArr=\(headerCharArr)")

        var rectHeaderImage:UIImage
        var cornerHeaderImageArr:[UIImage] = Array()
        var mergedCornerHeaderImage:UIImage = UIImage()

        let headImageSize:CGFloat

        switch headerCharArr.count {
        case 1:
            headImageSize = SIZE_CONVERSATION_HEADER_1
        case 3:
            headImageSize = SIZE_CONVERSATION_HEADER_3
        case 4:
            headImageSize = SIZE_CONVERSATION_HEADER_4
        case 9:
            headImageSize = SIZE_CONVERSATION_HEADER_9
        default:
            headImageSize = 0
            break
        }

        for (index, singleHeaderChar) in headerCharArr.enumerate() {
            print("singleHeaderChar=\(singleHeaderChar)")

            let headerLabel:UILabel
            headerLabel = UILabel(frame: CGRectMake(
                0,
                0,
                headImageSize,
                headImageSize))
            headerLabel.font = FONT_CONVERSATION_HEADER
            headerLabel.textColor = UIColor.whiteColor()
            headerLabel.text = singleHeaderChar
            headerLabel.textAlignment = NSTextAlignment.Center
            headerLabel.backgroundColor = UIColor.clearColor()

            rectHeaderImage = drawRectangleImage(
                CGSizeMake(headImageSize, headImageSize),
                color: getRandomHeaderColor())
            cornerHeaderImageArr[index] = drawCornerImage(rectHeaderImage, cornerRadius: 4)

            cornerHeaderImage.add .addSubview(headerLabel)
        }

//draw a rectangle image, filled with color, with size, with label
func drawRectangleImageWithLabel(size:CGSize, color:UIColor, label:UILabel) -> UIImage {
    let opaque:Bool = false
    let scale:CGFloat = 0
    UIGraphicsBeginImageContextWithOptions(size, opaque, scale)

    let context = UIGraphicsGetCurrentContext()
    //CGContextSetLineWidth(context, 4.0)
    //CGContextSetStrokeColorWithColor(context, UIColor.blueColor().CGColor)
    let rectangle = CGRectMake(0, 0, size.width, size.height)
    CGContextAddRect(context, rectangle)
    CGContextSetFillColorWithColor(context, color.CGColor)
    CGContextFillRect(context, rectangle)

    //label.drawTextInRect(rectangle)
    label.layer.renderInContext(context!)

    // Drawing complete, retrieve the finished image and cleanup
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    return image
}

            let headerLabel:UILabel
            headerLabel = UILabel(frame: CGRectMake(
                0,
                0,
                headImageSize,
                headImageSize))
            headerLabel.font = FONT_CONVERSATION_HEADER
            headerLabel.textColor = UIColor.whiteColor()
            headerLabel.text = "简"
            headerLabel.textAlignment = NSTextAlignment.Center
            headerLabel.backgroundColor = UIColor.clearColor()

            rectHeaderImage = drawRectangleImageWithLabel(
                CGSizeMake(headImageSize, headImageSize),
                color: getRandomHeaderColor(),
                label: headerLabel)

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