为UIImage添加圆角？

Question

我知道有可能在像UIImageView这样的对象上有圆角(我以前做过).但在这种情况下,我需要让我的方形UIImage有圆角.我知道这比仅仅对一个对象更难,但我需要专门用于UIImage.

任何人都可以共享一个非静态的方法,并且可以在我已经创建的类中实现吗？

我必须对UIImage执行此操作,除非可以将圆边添加到CCSprite.

谢谢!

EDIT2:

    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);
    CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);
    CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1);
    CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1);
    CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1);
    CGContextClosePath(context);
    CGContextRestoreGState(context);
}

-(UIImage *)makeRoundCornerImage : (UIImage*) img : (int) cornerWidth : (int) cornerHeight
{
    UIImage * newImage = nil;

    if( nil != img)
    {
        NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
        int w = img.size.width;
        int h = img.size.height;

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

        CGContextBeginPath(context);
        CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
        addRoundedRectToPath(context, rect, cornerWidth, cornerHeight);
        CGContextClosePath(context);
        CGContextClip(context);

        CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);

        CGImageRef imageMasked = CGBitmapContextCreateImage(context);
        CGContextRelease(context);
        CGColorSpaceRelease(colorSpace);
        [img release];

        newImage = [[UIImage imageWithCGImage:imageMasked] retain];
        CGImageRelease(imageMasked);

        [pool release];
    }

    return newImage;
}

Answer 1

使用/sf/answers/568792311/来修改UIBezierPath.它更简单.

使用上面发布的代码来自http://blog.sallarp.com/iphone-uiimage-round-corners/

// rounded corner 10x10
UIImage *original = [UIImage imageNamed:@"original.png"];
UIImage *rounded = [self makeRoundCornerImage:original :10 :10];