/// 给指定的图片进行拉伸
///
func avatarImage(image: UIImage, size:CGSize) -> UIImage? {
let rect = CGRect(origin: CGPoint(), size: size)
//上下文
/*
* size: 绘图尺寸
*不透明 false (透明)
*屏幕分辨率,默认使用 1.0,图像质量不好; 0 表示当前屏幕分辨率
*/
UIGraphicsBeginImageContextWithOptions(rect.size, true, 0)
//绘图
image.draw(in: rect)
//取结果
let result = UIGraphicsGetImageFromCurrentImageContext()
//关闭上下文
UIGraphicsEndImageContext()
return result
}
//MARK:设置圆角半径
func setcornerRadiusImage(image: UIImage, size:CGSize) -> UIImage? {
let rect = CGRect(origin: CGPoint(), size: size)
UIGraphicsBeginImageContextWithOptions(rect.size, true, 0)
//背景 填充
UIColor.red.setFill()
//填充
UIRectFill(rect)
//圆路径
let path = UIBezierPath(ovalIn: rect)
//裁切
path.addClip()
image.draw(in: rect)
//绘制内切的圆形
UIColor.darkGray.setStroke()
//绘制边线
path.lineWidth = 2.0
path.stroke()
//取结果
let result = UIGraphicsGetImageFromCurrentImageContext()
//关闭上下文
UIGraphicsEndImageContext()
return result
}