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来自http://replyz.com/c/1244746-does-anyone-know-the-exact-cgcolorref-used-to-create-the-selection-highlight-when-using-uitableviewcellselectionstyleblue#

我看到有人用 Code 做的,他说突出显示的颜色来自 UIImage。

我在哪里可以找到图像?

(我想用 UITableViewCellSelectionStyleBlue 颜色突出显示一个 UIButton)

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2 回答 2

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我找到了链接http://replyz.com/c/1244746-does-anyone-know-the-exact-cgcolorref-used-to-create-the-selection-highlight-when-using-uitableviewcellselectionstyleblue#包括一些代码可用于创建高光。我用代码创建了一个新的 UIImage。

这是代码:

+ (UIImage *) imageForSelectedBlue {
    CGRect rect = CGRectMake(0, 0, 10, 10);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();

    size_t num_locations = 2;
    CGFloat locations[2] = { 0.0, 1.0 };
    CGFloat components[8] = { 0.021, 0.548, 0.962, 1.000, 0.008, 0.364, 0.900, 1.000 };

    CGColorSpaceRef rgbColorspace = CGColorSpaceCreateDeviceRGB();
    CGGradientRef selectionGradient = CGGradientCreateWithColorComponents(rgbColorspace, components, locations, num_locations);

    CGPoint startPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMinY(rect));
    CGPoint endPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMaxY(rect));

    CGContextDrawLinearGradient(context, selectionGradient, startPoint, endPoint, 0);

    CGGradientRelease(selectionGradient);
    CGColorSpaceRelease(rgbColorspace);

    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}
于 2012-07-09T08:58:19.470 回答
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实际上,您可以设置按钮的背景图像。它更有效。

[button setBackgroundImage:buttonBackgroundPressed forState:UIControlStateHighlighted];
于 2012-07-09T12:20:11.920 回答