CODEWITHSUNDEEP
swiftperformanceanimation
Sethmr
Sethmr

Reputation: 3084

In Swift is there a difference between the rotation in these two scenarios

Example 1:

            let halfPie = Double.pi / 2
            var pieCount: Int = 0


            let rotationNum = (pieCount % 4) + 1
            let angle = halfPie * Double(rotationNum)
            UIView.animate(withDuration: 1, animations: { [weak self] in
                self?.containerView.transform = CGAffineTransform(rotationAngle: CGFloat(angle))
            }) { [weak self] _ in
                self?.pieCount += 1
            }

Example 2:

            let halfPie = 1.5707963267949
            var pieCount: Int = 1


            let angle = halfPie * Double(pieCount)
            UIView.animate(withDuration: 1, animations: { [weak self] in
                self?.containerView.transform = CGAffineTransform(rotationAngle: CGFloat(angle))
            }) { [weak self] _ in
                self?.pieCount += 1
            }

The difference between the two is that the second continues to increase, and the first keeps the number to max at PIE * 2. Is there any reason to impliment it one way over the other? They both seem to do the same thing. pieCount is initialized globally.

Upvotes: 0

Views: 51

Answers (1)

Craig Siemens
Craig Siemens

Reputation: 13296

There is no difference.

If you animate to 180° or 540°, the animation will be the same since the view will do the least amount of movement to get to the correct position.

On a side note, you shouldn't be hardcoding halfPie you should use Double.pi/2

Upvotes: 1

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