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)
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;
}
实际上,您可以设置按钮的背景图像。它更有效。
[button setBackgroundImage:buttonBackgroundPressed forState:UIControlStateHighlighted];