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我正在使用自定义的 tableview 单元格（如 Tweetie 的快速滚动），我在上下文中添加了一个渐变，看起来非常好，但是当我选择单元格时，渐变仍然可见。我不确定如何在选择单元格时删除渐变？有任何想法吗？

干杯

尼克

 - (void)drawContentView:(CGRect)r
{
 CGContextRef context = UIGraphicsGetCurrentContext();

 UIColor *backgroundColor = [UIColor whiteColor];
 UIColor *textColor = [UIColor blackColor];
 UIColor *dateColor = [UIColor colorWithRed:77.f/255.f green:103.f/255.f blue:155.f/255.f alpha:1];

 if(self.selected)
 {


  backgroundColor = [UIColor clearColor];
  textColor = [UIColor whiteColor];


 }
 [backgroundColor set];
 CGContextFillRect(context, r);

 //add gradient
 CGGradientRef myGradient;
 CGColorSpaceRef myColorspace;

 size_t num_locations = 2;
 CGFloat locations[2] = {0.0, 1.0};
 CGFloat components[8] = {0.9f, 0.9f, 0.9f, 0.7f, // Bottom Colour: Red, Green, Blue, Alpha.
  1.0f, 1.0f, 1.0f, 1.0}; // Top Colour: Red, Green, Blue, Alpha.

 myColorspace = CGColorSpaceCreateDeviceRGB();
 myGradient = CGGradientCreateWithColorComponents (myColorspace, components,
               locations, num_locations);

 CGColorSpaceRelease(myColorspace);

 CGPoint startPoint, endPoint;
 startPoint.x = 0;
 startPoint.y = self.frame.size.height;
 endPoint.x = 0;
 endPoint.y = self.frame.size.height-15; // just keep the gradient static size, never mind how big the cell is
 CGContextDrawLinearGradient (context, myGradient, startPoint, endPoint, 0); 
 CGGradientRelease(myGradient);

 //gradient end

    //rest of custom drawing goes here....

    }

我应该在 if cell selected 代码中做些什么吗？

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1 回答 1

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看起来我在发布后找到了灵感；-) 我只是将渐变的东西包装在 if(!self.selected) { draw gradient } 希望这对某人有所帮助，这似乎比使用 uiimagevew 更简单且 CPU 密集度更低（谢谢汤姆）

于 2010-05-22T22:49:08.183 回答