所以我似乎无法绘制 2 CGMutablePathRef。这是代码:
CGRect mainRect = CGRectMake(2, 2, rect.size.width-4, 210);
CGMutablePathRef mainPathRef = createRoundedRectForRect(mainRect, 4);
if (self.imageExists_){
[[UIColor colorWithRed:0 green:0 blue:0 alpha:1.0] set];
CGContextAddPath(context, mainPathRef);
CGContextClip(context);
UIGraphicsBeginImageContext(mainRect.size);
//need to flip the images to that it is drawn appropriately as CALayer uses a different coordinate system
CGContextSaveGState(context);
CGContextTranslateCTM(context, 0.0, 210);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawImage(context, mainRect, self.highlightItem_.highlightStoryImage.CGImage);
UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[scaledImage drawAtPoint:CGPointMake(0, 0)];
CGContextRestoreGState(context);
这可以在我指定的路径上很好地绘制图像,剪裁。但后来我想在它下面画另一个圆角矩形,所以我做了:
[[UIColor colorWithRed:0 green:0 blue:0 alpha:1.0] set];
CGFloat colors [] = {
0.20, 0.20, 0.20, 1.0,
0.17, 0.17, 0.17, 1.0
};
CGColorSpaceRef baseSpace = CGColorSpaceCreateDeviceRGB();
CGGradientRef gradient = CGGradientCreateWithColorComponents(baseSpace, colors, NULL, 2);
CGColorSpaceRelease(baseSpace), baseSpace = NULL;
CGContextSaveGState(context);
CGRect commentRect = CGRectMake(2, 215, rect.size.width-4, rect.size.height - 215);
CGMutablePathRef pathRef = createRoundedRectForRect(commentRect, 3);
CGContextAddPath(context, pathRef);
CGContextClip(context);
CGPoint startPoint = CGPointMake(CGRectGetMidX(commentRect), CGRectGetMinY(commentRect));
CGPoint endPoint = CGPointMake(CGRectGetMidX(commentRect), CGRectGetMaxY(commentRect));
CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, 0);
CGGradientRelease(gradient), gradient = NULL;
CGContextRestoreGState(context);
CGContextAddPath(context, pathRef);
CGContextDrawPath(context, kCGPathStroke);
知道为什么这不起作用吗?