iOS中裁剪圆形头像
- (void)clipImage
{
// 0.加载图片
UIImage *image = [UIImage imageNamed:@"阿狸头像"];
// 1.开启位图上下文,跟图片尺寸一样大
UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
// 2.设置圆形裁剪区域,正切与图片
// 2.1创建圆形的路径
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
// 2.2把路径设置为裁剪区域
[path addClip];
// 3.绘制图片
[image drawAtPoint:CGPointZero];
// 4.从上下文中获取图片
UIImage *clipImage = UIGraphicsGetImageFromCurrentImageContext();
// 5.关闭上下文
UIGraphicsEndImageContext();
_imageView.image = clipImage;
}