Question

anyone can give me any hint to recreate the iPhone ios4 folder effect? I’d like to implement that in my iPhone App.
Thanks

Answer 1

Hmmm — Off the top of my head (not at all final/fully developed idea):

You have a few options here to handle the interactions – but first off you will need to look at CATransforms and UIView Animations – they will be essential in animating the scaling and translating of your views.

With the interactions, might I suggest using UIGestureRecognizers – they provide a great base of interaction (singleTouch, doubleFingerTouch, Tap, Pan, Pinch, swipe, Rotate etc) – you can set number of touches/taps required as well.

The general setup would be to apply a pan recognizer to your views – then possibly have a timer that counts how long a view has been hovered over another – or have a certain region where a pan actives on another view. Then you would animate a UIView to replicate the opening of the folder (tell the view to scale vertically or similar), add the subviews (title field, current objects inside the folder etc) — then when you release the view being panned you would animate it to scale down into the folder.

A nice idea would be to store folder information using CoreData too (then you can easily re-load folders and alter them etc).

Just an idea,

Feel free to ask specific questions about animating views – I have been working in the area a fair bit in the recent weeks.

Best regards,

Michael