shape_and_gestures_ios_app's Introduction

Shape_and_Gestures_iOS_App

In this very simple app, I have tried to demonstrate how to use different kind of gestures on an UIImageView. Of course it can be extended to any other custom UIView as well.

Gestures experimented:

1. Tap 2. Double Tap 3. Triple Tap 4. Long Press 5. Pan 6. Rotate 7. Pinch
To try out these gesture in a simulator, you would simply do as the gesture name suggests.
For the Pan, click and move up/down/left/right.
The rotate and pinch gesture are kind of tricky. You would have to hold down the "option" key and you will see two small circles pop to show your interaction. For pinch you can just move it however you like to see zooming work. For rotate, you have to make sure that when you are moving it the distance between the two circles remain the same for the effect to kick in.

Screenshots of the Shapes:

Circles Image

Squares Image

Triangles Image

A Custom Shape Image

Everything Together Image

As you can see from the screenshots, the circles and squares are created at the same point. Same thing goes for the triangles too, all at the same point. This is because, while trying to make a double or triple tap, it still get registered as a single tap and double tap respectively. Hence, all three shapes pop up. For it to recongnize the taps precisely, you would have to write a custom gesture recognizer function with delay in it. This is also the reason, I haven't included the Swipe gesture since it doesn't work with the Pan gesture (or at least at the time of writing this) the way I have implemented it.
Also if you need to understand how UIBezierPath works, the shape drawing functions would be a good starting point. And then there's always the official documentation.

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