我想提请在代表手表的数字圆圈12张图像,我已经阅读计算器关于与透明边框图像的所有议题,但它不是我的情况下工作抗锯齿的UIImage看起来模糊或锯齿状
-(UIImage *)addImageNumber_:(UIImage *)img {
int w = img.size.width;
int h = img.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1);
CGContextSetShouldAntialias(context,YES);
CGContextSetAllowsAntialiasing(context ,YES);
CGAffineTransform transform;
for (int x=0; x<=11; x++) {
UIImage *timg1 = [UIImage imageNamed:@"2.png"];
CGRect imageRect = CGRectMake(0, 0, timg1.size.width+2, timg1.size.height+2);
UIGraphicsBeginImageContext(imageRect.size);
[timg1 drawInRect:CGRectMake(1,1,timg1.size.width,timg1.size.height)];
timg1 = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
transform = CGAffineTransformIdentity;
CGContextDrawImage(context, CGRectMake((w-26)/2, 0, 26, 30), timg1.CGImage);
transform = CGAffineTransformConcat(transform, CGAffineTransformMakeTranslation(-w/2, -w/2));
transform = CGAffineTransformConcat(transform, CGAffineTransformMakeRotation(radians(30)));
transform = CGAffineTransformConcat(transform, CGAffineTransformMakeTranslation(w/2, w/2));
CGContextConcatCTM(context, transform);
}
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return [UIImage imageWithCGImage:imageMasked];
}
UIViewEdgeAntialiasing = YES;
UIImage *img = [UIImage imageNamed:@"test.png"];
UIImage *img2 = [self addImageNumber_:img ];
R1.image = img2;
[self.view addSubview:R1];
测试IMG是手表的背景,2.png是一个透明的PNG有透明边界
号的牛逼12'o时钟和6'o时钟看起来不错,因为他们不旋转,其余都是锯齿
抗锯齿不应与UIImageViews的一个问题。我认为这可能是另一个问题。你是否急剧缩小了你使用的图像? –
没有图像被缩小,它们都具有原始尺寸 –
您获得的质量是技术上可行的。当您创建原始图像时,会使用最佳的抗锯齿功能。当你旋转它时,它不再是最佳的。每次转换只会导致质量下降。最好使用文本绘图功能来创建时钟。 – Codo