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)
}注：
此处由于不方便用UIImageView，所以就只是需要
把label合并到UIImage中。
搜：
swift UIImage add UILabel
参考：
搜：
swift merge UILabel into UIImage
参考：
把简字的label，放入到UIImage中：
//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) 效果：
更多的图片相关的函数，可参考：