iphone - UITableView header -iPhone

在我的iPhone应用程序中，我想更改UITableView上的标题。除了更改颜色之外，如何保持灰色，默认标头的渐变/ alpha /漂亮外观？

最佳答案

如果要应用渐变，则可以创建一个自定义视图类，然后重写drawRect：并使用CoreGraphics绘制渐变
例如

- (void) drawRect:(CGRect)rect
{
    CGContextRef currentContext = UIGraphicsGetCurrentContext();

    CGGradientRef glossGradient;
    CGColorSpaceRef rgbColorspace;
    size_t num_locations = 2;
    CGFloat locations[2] = { 0.0, 1 };

    const CGFloat *startColorComponents = CGColorGetComponents(startColor.CGColor);
    const CGFloat *endColorComponents = CGColorGetComponents(endColor.CGColor);

    CGFloat components[8] = { startColorComponents[0], startColorComponents[1], startColorComponents[2], startColorComponents[3],  // Start color
        endColorComponents[0], endColorComponents[1], endColorComponents[2], endColorComponents[3] }; // End color

    rgbColorspace = CGColorSpaceCreateDeviceRGB();
    glossGradient = CGGradientCreateWithColorComponents(rgbColorspace, components, locations, num_locations);

    CGRect currentBounds = self.bounds;
    CGPoint topCenter = CGPointMake(CGRectGetMidX(currentBounds), 0.0f);
    CGPoint bottomCenter = CGPointMake(CGRectGetMidX(currentBounds), CGRectGetMidY(currentBounds));
    CGContextDrawLinearGradient(currentContext, glossGradient, topCenter, bottomCenter, 0);

    CGGradientRelease(glossGradient);
    CGColorSpaceRelease(rgbColorspace);
}

然后按照Sachin的建议进行操作，但改用您的自定义视图类。