LoadingIndicator.gif
这种魔术般的效果是怎么做到的？用简单的UIView动画即可：
/// 缩小
private func scaleToSmall() {
guard isAnimatedEnable else {
return
}
isAnimating = true
self.contentView.snp.updateConstraints { (make) in
make.width.height.equalTo(self.dotRadius * 2)
}
UIView.animate(withDuration: animationDuration / 2, animations: {
self.contentView.layoutIfNeeded()
self.contentView.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
}) { (_) in
self.isAnimating = false
self.scaleToLarge()
if self.isAnimatedEnable == false {
self.prepareToAnimate()
}
}
}
/// 放大
private func scaleToLarge() {
guard isAnimatedEnable else {
return
}
isAnimating = true
self.contentView.snp.updateConstraints { (make) in
make.width.height.equalTo(self.sideLength)
}
UIView.animate(withDuration: animationDuration / 2, animations: {
self.contentView.layoutIfNeeded()
self.contentView.transform = CGAffineTransform.identity
}) { (_) in
self.isAnimating = false
self.scaleToSmall()
}
}
使用方法：
LoadingIndicator.share.show(inView: view)
LoadingIndicator.share.dismiss()
