- (UIImage *) createImageWithColor: (UIColor *) color 
{   
    CGRect rect = CGRectMake(0.0f,0.0f,1.0f,1.0f);  
    UIGraphicsBeginImageContext(rect.size);   
    CGContextRef context =UIGraphicsGetCurrentContext();  
    CGContextSetFillColorWithColor(context, [colorCGColor]);  
    CGContextFillRect(context, rect);   
    UIImage *myImage =UIGraphicsGetImageFromCurrentImageContext();  
    UIGraphicsEndImageContext();   
    return myImage;   
}   

iOS用颜色值创建图片