背景颜色转为UIImage

UIColor *colorHightlighted = [UIColor colorWithRed:186.0/255 green:189.0/255blue:194.0/255 alpha:1.0];

CGSize imageSize = CGSizeMake(frameW, 54);

    UIGraphicsBeginImageContextWithOptions(imageSize, 0, [UIScreen mainScreen].scale);

    [colorHightlighted set];

    UIRectFill(CGRectMake(0, 0, imageSize.width, imageSize.height));

    UIImage *pressedColorImg = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();