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。我知道这不仅仅是对一个对象这么做,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;
}
答案 0 :(得分:6)
使用https://stackoverflow.com/a/8125604/412916来修改UIBezierPath。它更简单。
使用上面http://blog.sallarp.com/iphone-uiimage-round-corners/
// rounded corner 10x10
UIImage *original = [UIImage imageNamed:@"original.png"];
UIImage *rounded = [self makeRoundCornerImage:original :10 :10];
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