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    <p>I have a similar interface element in an app I've written. My interface element is a UIViewController for the entire tool panel. I put a UIButton over the gripper illustration, change the button's type to custom so it visually disappears. I connect Touch Drag Inside and Touch Drag Outside to an IBAction that adjusts the position of the panel according to where the drag moves. I connect Touch Up Inside and Touch Up Outside to an IBAction that finalizes the positioning of the view. If the touch up event happens too close to the bottom, I just close the panel. If it happens anywhere higher than that threshold I open the panel. I use UIView's animation methods to smooth out these transitions. The over extension element seen in the JetBlue app can be accomplished in the drag event handler. As the panel gets closer and closer to the limit, open the view a smaller and smaller amount with each move of the touch higher. Then in the finalization, just animate the panel back down into it's preferred ending position. </p> <p>The JetBlue app differs from my app in that I have a small gripper area, but JetBlue's app allows you to swipe the whole panel to adjust position. To match that functionality, I would adjust my implementation to totally cover the panel with buttons. Each would respond to my drag events with the addition that dragging would set a flag. Then my touch up event handler would check if the flag was set. If so, finalize the dragging of the panel. Otherwise, perform the appropriate action associated with each button.</p>
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    1. POHow to gently drag panel from offscreen like JetBlue iPhone app
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    1. USMr. Berna
    1. USMr. Berna
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    1. COGood descriptive answer
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      1. USTom Redman
    2. COhow do you get the coordinates of the touch-event from within the IBAction Method?
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      1. USsamsam
    3. CO@samsam: An IBAction method can have one of three signatures, no parameters, one parameter (sender) and two parameters (sender and touch event). Just use the version with the touch event which includes the touch location data.
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