Questions tagged «cgcontext»

13
更改UIImage颜色
我正在尝试更改UIImage的颜色。我的代码: -(UIImage *)coloredImage:(UIImage *)firstImage withColor:(UIColor *)color { UIGraphicsBeginImageContext(firstImage.size); CGContextRef context = UIGraphicsGetCurrentContext(); [color setFill]; CGContextTranslateCTM(context, 0, firstImage.size.height); CGContextScaleCTM(context, 1.0, -1.0); CGContextSetBlendMode(context, kCGBlendModeCopy); CGRect rect = CGRectMake(0, 0, firstImage.size.width, firstImage.size.height); CGContextDrawImage(context, rect, firstImage.CGImage); CGContextClipToMask(context, rect, firstImage.CGImage); CGContextAddRect(context, rect); CGContextDrawPath(context,kCGPathElementMoveToPoint); UIImage *coloredImg = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return coloredImg; } 这段代码有效,但是获得的图像效果不佳:返回图像的边界像素是间歇性的,不像我的第一个图像那样平滑。我该如何解决这个问题?
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