add content to UIScrollView, auto calc scrollView's content size.

UIScrollView+addView.m

//
//  UIScrollView+addView.m
//
//  Created by J_ogawa on 2013/12/24.
//  Copyright (c) 2013年 J_ogawa. All rights reserved.
//

#import "UIScrollView+addView.h"

@implementation UIScrollView (addView)

- (void)addView:(UIView *)view isHorizontal:(BOOL)isHorizontal{
    //Shrink addView to scrollView frame
    view.frame = (isHorizontal) ? CGRectMake(self.contentSize.width, 0, view.frame.size.width, view.frame.size.height)
    : CGRectMake(0, self.contentSize.height, view.frame.size.width, view.frame.size.height);
  
    //Expand contentSize  
    self.contentSize = (isHorizontal) ? CGSizeMake(self.contentSize.width + view.frame.size.width, self.contentSize.height)
    : CGSizeMake(self.contentSize.width, self.contentSize.height + view.frame.size.height);
    [self addSubview:view];
}

- (void)addView:(UIView *)view isHorizontal:(BOOL)isHorizontal padding:(CGFloat)padding
{
    //Make padding space to add blank view
    if (!(self.contentSize.width == 0.0 && self.contentSize.height == 0.0)) {
        UIView *space = [[UIView alloc]initWithFrame:CGRectMake(0, 0, padding, padding)];
        [self addView:space isHorizontal:isHorizontal];
    }
    [self addView:view isHorizontal:isHorizontal];
}

- (void)removeAllAddedContent
{
    for (UIView *view in self.subviews) {
        [view removeFromSuperview];
         self.contentSize = CGSizeMake(self.contentSize.width - view.frame.size.width, self.contentSize.height);
    }
}

@end