,,,,点击后颜色，

- (void)drawRect:(CGRect)rect

{

    CGContextRef context = UIGraphicsGetCurrentContext();

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGFloat locations[] = {0.0, 1.0};

//    蓝色

//    NSArray* colors = [NSArray arrayWithObjects:(__bridge id)RGBCOLOR(4, 135, 243).CGColor, (__bridge id)RGBCOLOR(1, 94, 230).CGColor, nil];

//    黄色

    NSArray* colors = [NSArray arrayWithObjects:(__bridge id)RGBCOLOR(243, 145, 4).CGColor, (__bridge id)RGBCOLOR(230, 103, 1).CGColor, nil];

    CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef)colors, locations);

    CGPoint startPoint = CGPointMake(CGRectGetWidth(rect) / 2, 0);

    CGPoint endPoint = CGPointMake(CGRectGetWidth(rect) / 2, CGRectGetHeight(rect));

    CGContextSaveGState(context);

    CGContextAddRect(context, rect);

    CGContextClip(context);

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

    CGContextRestoreGState(context);

    CGGradientRelease(gradient);

    CGColorSpaceRelease(colorSpace);

}