将图片裁剪成圆角的代码,ObjC代码库,德仔网

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【ObjC】将图片裁剪成圆角的

作者:宝清 / 发布于2014/11/17/ 461

用在TableViewCell上显示，没有发现吨卡的现象


	static void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth,
	 float ovalHeight)
	{
	 float fw, fh;
	 if (ovalWidth == 0 || ovalHeight == 0) {
	 CGContextAddRect(context, rect);
	 return;
	 }
	
	 CGContextSaveGState(context);
	 CGContextTranslateCTM(context, CGRectGetMinX(rect), CGRectGetMinY(rect));
	 CGContextScaleCTM(context, ovalWidth, ovalHeight);
	 fw = CGRectGetWidth(rect) / ovalWidth;
	 fh = CGRectGetHeight(rect) / ovalHeight;
	
	 CGContextMoveToPoint(context, fw, fh/2); // Start at lower right corner
	 CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1); // Top right corner
	 CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1); // Top left corner
	 CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1); // Lower left corner
	 CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); // Back to lower right
	
	 CGContextClosePath(context);
	 CGContextRestoreGState(context);
	}
	
	+ (UIImage *)createRoundedRectImage:(UIImage *)image size:(CGSize)size roundRadius:(CGFloat)radius {
	 if (!radius)
	 radius = 8;
	 // the size of CGContextRef
	 int w = image.size.width;
	 int h = image.size.height;
	
	 UIImage *img = image;
	 CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
	 CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, (CGBitmapInfo)kCGImageAlphaPremultipliedFirst);
	 CGRect rect = CGRectMake(0, 0, w, h);
	
	 CGContextBeginPath(context);
	 addRoundedRectToPath(context, rect, radius, radius);
	 CGContextClosePath(context);
	 CGContextClip(context);
	 CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
	 CGImageRef imageMasked = CGBitmapContextCreateImage(context);
	 CGContextRelease(context);
	 CGColorSpaceRelease(colorSpace);
	 return [UIImage imageWithCGImage:imageMasked];
	}

试试其它关键字

　圆角　　裁剪　

同语言下

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