SGWMScrollView

SGWMScrollView.h

//
//  SGWMScrollView.h
//  SmartGardenWateringMobile
//
//  Created by Nicholas Bruning on 21/10/11.
//  Copyright (c) 2011 Involved. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface SGWMScrollView : UIScrollView
@property (nonatomic) CGRect interactiveFrame;
-(id) initWithFrame:(CGRect)frame interactiveFrame:(CGRect)intFrame;
@end

SGWMScrollView.m

//
//  SGWMScrollView.m
//  SmartGardenWateringMobile
//
//  Created by Nicholas Bruning on 21/10/11.
//  Copyright (c) 2011 Involved. All rights reserved.
//

#import "SGWMScrollView.h"

@implementation SGWMScrollView

@synthesize interactiveFrame;

-(id) initWithFrame:(CGRect)frame interactiveFrame:(CGRect)intFrame{
    self = [super initWithFrame:frame];
    if(self){
        self.clipsToBounds = NO;
        interactiveFrame = intFrame;
        interactiveFrame.origin.x -= frame.origin.x;
        interactiveFrame.origin.y -= frame.origin.y;
    }
    return self;
}

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event{
    CGRect pointTestFrame = interactiveFrame;
    pointTestFrame.origin.x += self.contentOffset.x;
    pointTestFrame.origin.y += self.contentOffset.y;
    
    if(CGRectContainsPoint(pointTestFrame, point)){
        return YES;
    }
    return NO;
}

@end

SomeViewController.m

CGRect innerFrame = CGRectMake(20, 40, 280, 280);
CGRect outerFrame = CGRectMake(0, 40, 320, 280);
    
self.scrollView = [[SGWMScrollView alloc] initWithFrame:innerFrame interactiveFrame:outerFrame];