按钮背景颜色

- (void)setBackgroundColor:(UIColor *)backgroundColor forState:(UIControlState)state {

[self setBackgroundImage:[UIButton imageWithColor:backgroundColor] forState:state];

}

+ (UIImage *)imageWithColor:(UIColor *)color {

CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);

UIGraphicsBeginImageContext(rect.size);

CGContextRef context = UIGraphicsGetCurrentContext();

CGContextSetFillColorWithColor(context, [color CGColor]);

CGContextFillRect(context, rect);

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return image;

}