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生成圆角图片

/ Published in: Objective C
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  1. void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth, float ovalHeight);
  2. {
  3. 	float fw, fh;
  4. 	if (ovalWidth == 0 || ovalHeight == 0) {
  5. 		CGContextAddRect(context, rect);
  6. 		return;
  7. 	}
  8. 	CGContextSaveGState(context);
  9. 	CGContextTranslateCTM (context, CGRectGetMinX(rect), CGRectGetMinY(rect));
  10. 	CGContextScaleCTM (context, ovalWidth, ovalHeight);
  11. 	fw = CGRectGetWidth (rect) / ovalWidth;
  12. 	fh = CGRectGetHeight (rect) / ovalHeight;
  13. 	CGContextMoveToPoint(context, fw, fh/2);
  14. 	CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);
  15. 	CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1);
  16. 	CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1);
  17. 	CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1);
  18. 	CGContextClosePath(context);
  19. 	CGContextRestoreGState(context);
  20. }
  21.  
  22. - (UIImage *)roundCornersOfImage:(UIImage *)source;
  23. {
  24. 	int w = source.size.width;
  25. 	int h = source.size.height;
  26.  
  27. 	CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  28. 	CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
  29.  
  30. 	CGContextBeginPath(context);
  31. 	CGRect rect = CGRectMake(0, 0, w, h);
  32. 	addRoundedRectToPath(context, rect, 5, 5);
  33. 	CGContextClosePath(context);
  34. 	CGContextClip(context);
  35.  
  36. 	CGContextDrawImage(context, CGRectMake(0, 0, w, h), source.CGImage);
  37.  
  38. 	CGImageRef imageMasked = CGBitmapContextCreateImage(context);
  39. 	CGContextRelease(context);
  40. 	CGColorSpaceRelease(colorSpace);
  41.  
  42. 	return [UIImage imageWithCGImage:imageMasked];    
  43. }
  44.  

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