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  • 设置UIImage 圆角

     //设置UIImage圆角

    @interface UIImage(UIRoundedRectImage)

    + (id) createRoundedRectImage:(UIImage*)image size:(CGSize)size;

    @end

    @implementation UIImage(UIRoundedRectImage)

    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);

    }

    + (id) createRoundedRectImage:(UIImage*)image size:(CGSize)size

    {

        // the size of CGContextRef

        int w = size.width;

        int h = size.height;

        

        UIImage *img = image;

        CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

        CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace,kCGImageAlphaPremultipliedFirst);

        CGRect rect = CGRectMake(0, 0, w, h);

        

        CGContextBeginPath(context);

        addRoundedRectToPath(context, rect, 5, 5);

        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];

    }

    @end

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  • 原文地址:https://www.cnblogs.com/rollrock/p/5235793.html
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