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UIGestureRecognizer Tutorial: Getting Started

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In this tutorial, you will learn how to configure UIGestureRecognizer objects and also create custom ones in code.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/433-uigesturerecognizer-tutorial-getting-started
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Hi Brody, great tutorial! I definitely found it useful. For the custom UIGestureRecognizer, I believe it’s possible to simply import UIKit.UIGestureRecognizerSubclass directly into the Swift file instead of adding the bridging header. Do you know if there is any downside to using this approach?

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this tutorial don’t work in any way as described… but look at the case, the final project work fine…
pls stop making tuts

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Wonderful tutorial! Very concise and easy to follow.

Hope to see more tutorials in this kind of concise instruction format.

Thank you for the wonderful tutorial :smiley:

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@wviper3 great tutorial. but I’ve question. is there a way to resize the height and the width draging a corner of a view? if yes, how?

thanks

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Hey @alex_andrews, it is possible to import UIKit.UIGestureRecognizerSubclass. I wasn’t aware of this so thanks for the tip! I don’t see any downside to importing directly in Swift and it saves you from having to create a bridging header. I was following Apple’s UIGestureRecognizer documentation which states:

The state property is declared in UIGestureRecognizer.h as being read-only. This property declaration is intended for clients of gesture recognizers. Subclasses of UIGestureRecognizer must import UIGestureRecognizerSubclass.h. This header file contains a redeclaration of state that makes it read-write.

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@rufy Do you want to change the bounds of the image views that receive the gesture?

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yes, that’s right. I want to show a view that has 1 or more corner on which the user can touch and drag to edit the dimension of view. is it possible?

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You can use a custom UIGestureRecognizer to handle the touches and change view.transorm to resize the view. As for the corners, this stack overflow thread shows how to implement something like that.

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Hi Brody, this tutorial really helped me! I implemented it elsewhere on a small View area with buttons. I can tilt and resize just fine. But when I press a button, the view re-centers itself on the screen. How can I maintain x-y through a simple button press?

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@randy918 that seems to be some interesting behavior. Do you have any code you could send? Are you using a custom UIGestureRecognizer?

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This tutorial is more than six months old so questions are no longer supported at the moment for it. Thank you!