i have a question that is it possible to make animation on rotating a UILabel during Scrolling UITableView ? then how i can do it ? when user begin to scroll the UILabel will begin rotate based on scroll ! Objective-C and Swift are both ok for me
sorry for my bad english :)
based on Fogmeister solution i wrote in swift and it works Well ;)
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let maximumHorizontalOffset: CGFloat = scrollView.contentSize.width - scrollView.frame.width
let currentHorizontalOffset: CGFloat = scrollView.contentOffset.x
let maximumVerticalOffset : CGFloat = scrollView.contentSize.height - scrollView.frame.height;
let currentVerticalOffset : CGFloat = scrollView.contentOffset.y;
let percentageVerticalOffset : CGFloat = currentVerticalOffset / maximumVerticalOffset;
let percentageHorizontalOffset: CGFloat = currentHorizontalOffset / maximumHorizontalOffset;
scrollMyView(scrollView, didScrollToPercentageOffset: CGPoint(x: percentageHorizontalOffset, y: percentageVerticalOffset))
}
func scrollMyView(_ scrollView: UIScrollView?, didScrollToPercentageOffset percentageOffset: CGPoint) {
UIView.animate(withDuration: 0.5, animations: {
self.myImageView.transform = CGAffineTransform(rotationAngle: (self.rotate(forOffsetPercentage: percentageOffset.y) * .pi) / 1)
})
}
func rotate(forOffsetPercentage percentage: CGFloat) -> CGFloat {
let min: CGFloat = 1.0
let max: CGFloat = 360.0
let value : CGFloat = (max - min) * percentage + min
return value
}
Try to find out the scrollview Y position, when you scroll. And if condition meets, then do your animation.