/**
绘制圆角图片
@param boardW 边框宽度
@param boardColor 边框颜色
@param image 裁剪图片
@return 圆角图片
*/
+ (UIImage *)imageWithBoard:(CGFloat)boardW
boardColor:(UIColor *)boardColor
image:(UIImage *)image;
+ (UIImage *)imageWithBoard:(CGFloat)boardW boardColor:(UIColor *)boardColor image:(UIImage *)image{
// 带边框,相当于分两次绘制,第一次绘制: 绘制大圆;第二次绘制: 在大圆的基础上进行图片裁剪绘制
// 1. 确定边框宽度和大圆尺寸
CGSize size = CGSizeMake(image.size.width+2*boardW, image.size.height+2*boardW);
// 2. 开启跟原始图片一样的位图上下文
UIGraphicsBeginImageContextWithOptions(size, NO, 0);
// 3. 设置一个大圆
UIBezierPath * path = [UIBezierPath bezierPathWithOvalInRect:(CGRectMake(0, 0, size.width, size.height))];
// 3.1 设置填充颜色
[boardColor set];
// 3.2 填充展示
[path fill];
// 4.1 绘制一个小圆
UIBezierPath * clipPath = [UIBezierPath bezierPathWithOvalInRect:(CGRectMake(boardW, boardW, image.size.width, image.size.height))];
// 4.2 把圆形的路径设置成裁剪路径
[clipPath addClip]; //默认超出裁剪区域以外的内容都裁剪掉
// 5. 把图片绘制到上下文中(超出裁剪区域以外的内容都会裁剪掉)
[image drawAtPoint:CGPointMake(boardW, boardW)];
// 6. 从上下文中获取图片
UIImage * tempImage = UIGraphicsGetImageFromCurrentImageContext();
// 7. 关闭上下文
UIGraphicsEndImageContext();
return tempImage;
}
