@interface UIImage (Resize)
//按形狀切割圖像
- (UIImage*)cutImageWithRadius:(int)radius;
@end
//圖片剪切
-
(UIImage*)cutImageWithRadius:(int)radius
{
UIGraphicsBeginImageContext(self.size);
CGContextRef gc = UIGraphicsGetCurrentContext();float x1 = 0.;
float y1 = 0.;
float x2 = x1+self.size.width;
float y2 = y1;
float x3 = x2;
float y3 = y1+self.size.height;
float x4 = x1;
float y4 = y3;
radius = radius*2;CGContextMoveToPoint(gc, x1, y1+radius);
CGContextAddArcToPoint(gc, x1, y1, x1+radius, y1, radius);
CGContextAddArcToPoint(gc, x2, y2, x2, y2+radius, radius);
CGContextAddArcToPoint(gc, x3, y3, x3-radius, y3, radius);
CGContextAddArcToPoint(gc, x4, y4, x4, y4-radius, radius);CGContextClosePath(gc);
CGContextClip(gc);CGContextTranslateCTM(gc, 0, self.size.height);
CGContextScaleCTM(gc, 1, -1);
CGContextDrawImage(gc, CGRectMake(0, 0, self.size.width, self.size.height), self.CGImage);UIImage *newimage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();return newimage;
}
