Question

i’d like to know how to resize subviews within a ScrollView using gestures, specifically Pinch Gestures. I don’t want to scale (I mean, I don’t need to Zoom in/out) its content, but I need to resize the view’s frame. Can anyone help me?

Answer 1

Add pinch gesture recognizer to your mainView:

UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc]
                                          initWithTarget:self action:@selector(handlePinchGesture:)];
pinchGesture.delegate = self;
[mainView addGestureRecognizer:pinchGesture];
[pinchGesture release];

then react to the pinch:

- (IBAction)handlePinchGesture:(UIPinchGestureRecognizer *)sender {

    switch (sender.state) {
        case UIGestureRecognizerStateBegan:
            if([sender scale] < 1){
                NSArray *subViews = [mainView subviews];
                for( UIView *view in subViews){
                     //Adjust the size of your subview however you like
                     CGRect newFrame = CGRectMake(x,x,x,x);
                     view.frame = newFrame;
                }
            }else if([sender scale] > 1){ 
                //resize frame (zoom in)

            } 

            break;

        default:
            break;
    }
}

If your mainView has an option @property(nonatomic) BOOL autoresizesSubviews set to YES you could just resize the mainView frame otherwise you will have to go through all the mainView subviews and resize them accordingly