UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
[btn setBackgroundImage:[UIImage imageNamed:@"'"] forState:UIControlStateNormal];
[btn setBackgroundImage:[UIImage imageNamed:@"'"] forState:UIControlStateSelected];
//然而系统提供的方法只能从图片获取颜色
//介绍一种方法,可以根据颜色生成图片
#pragma mark - 根据颜色获取图片
- (UIImage *)createImageWithColor:(UIColor *)color
{
//图片尺寸
CGRect rect = CGRectMake(0, 0, 10, 10);
//填充画笔
UIGraphicsBeginImageContext(rect.size);
//根据所传颜色绘制
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, color.CGColor);
//显示区域
CGContextFillRect(context, rect);
// 得到图片信息
UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
//消除画笔
UIGraphicsEndImageContext();
return image;
}
