CODEWITHSUNDEEP
iosswiftanimationcore-animationcabasicanimation
Salim Braksa
Salim Braksa

Reputation: 130

How to skip a part of an animation?

I have a view initially located at position A , and two other positions named B and C.
This image shows the initial state of the view.

enter image description here

What I want to achieve is to animate the view from B to C, but in a different way.

I want the animation object to start from A and finishes at C but skips the A→B part, performing only the B→C part.

The code should look like this :

// aLabel and cLabel are the labels shown in the image above
let a = aLabel.center.x
let c = cLabel.center.x

let animation = CABasicAnimation(keyPath: "position.x")
animation.duration = 3

// The animation should start in code from A
animation.fromValue = a

// And ends at C
animation.toValue = c

// Update the model layer
someView.layer.position.x = c

/* ADD SOMETHING TO MAKE THE ANIMATION 
STARTS FROM B AND ENDS AT C */

What I've already tried

I tried to set the animation offset to 1.5 : 

animation.timeOffset = 1.5

But It didn't work. The animation executes as following: B → C → A → B , I only want B → C

Upvotes: 2

Views: 241

Answers (1)

alephao
alephao

Reputation: 1273

To jump the A→B part, you can set the fromValue to bLabel center.

animation.fromValue = bLabel.center.x

if you want to keep the fromValue and toValue set the repeatDuration along with timeOffset:

    animation.timeOffset = 1.5
    animation.repeatDuration = 1.5

Upvotes: 3

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