CODEWITHSUNDEEP
swiftuiviewswift3
Eli
Eli

Reputation: 768

Perform 2 CGAffineTransform in a UIView.Animate - Swift

Hey so i want a button in my view to grow when the view loads with a little animation.

When the view loads ect i set the start values

override func viewWillAppear(_ animated: Bool) {

    let shrink = CGAffineTransform(scaleX: 0, y: 0);
    let rotate = CGAffineTransform(rotationAngle: -90)
    checkButton.alpha = 0
    nextView.transform = shrink.concatenating(rotate)

}

and then in view did appear I perform the animations

 override func viewDidAppear(_ animated: Bool) {
    UIView.animate(withDuration: 0.35, animations: {
        let grow = CGAffineTransform(scaleX: 1, y: 1);
        let rotate = CGAffineTransform(rotationAngle: 0)
        self.checkButton.alpha = 1
        self.nextView.transform = grow.concatenating(rotate)
    })
}

But only the grow animation works? How do i get it so it grows from scale 0 to scale 1 and rotates from 90 degrees to 0 degrees?

Cheers

Upvotes: 2

Views: 4867

Answers (1)

Derek
Derek

Reputation: 1021

I'm not quite sure why starting at scale 0 prevents it from rotating, but bumping up the scale on willAppear did the trick.

override func viewWillAppear(_ animated: Bool) {
    let shrink = CGAffineTransform(scaleX: 0.01, y: 0.01);
    let rotate = CGAffineTransform(rotationAngle: -90)
    checkButton.alpha = 0
    nextView.transform = shrink.concatenating(rotate)
}

override func viewDidAppear(_ animated: Bool) {
    UIView.animate(withDuration: 0.35, animations: {
        let grow = CGAffineTransform(scaleX: 1, y: 1);
        let rotate = CGAffineTransform(rotationAngle: 0)
        self.checkButton.alpha = 1
        self.nextView.transform = grow.concatenating(rotate)
    })
}

Upvotes: 4

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