以上所有答案均有效。
另外,我建议使用Swift创建一个UIView扩展,以“缩放”所需的任何视图。
您可以从这段代码中获得启发:
SWIFT 5.0
extension UIView {
func zoomIn(duration: TimeInterval = 0.2) {
self.transform = CGAffineTransform(scaleX: 0.0, y: 0.0)
UIView.animate(withDuration: duration, delay: 0.0, options: [.curveLinear], animations: { () -> Void in
self.transform = .identity
}) { (animationCompleted: Bool) -> Void in
}
}
func zoomOut(duration : TimeInterval = 0.2) {
self.transform = .identity
UIView.animate(withDuration: duration, delay: 0.0, options: [.curveLinear], animations: { () -> Void in
self.transform = CGAffineTransform(scaleX: 0.0, y: 0.0)
}) { (animationCompleted: Bool) -> Void in
}
}
func zoomInWithEasing(duration: TimeInterval = 0.2, easingOffset: CGFloat = 0.2) {
let easeScale = 1.0 + easingOffset
let easingDuration = TimeInterval(easingOffset) * duration / TimeInterval(easeScale)
let scalingDuration = duration - easingDuration
UIView.animate(withDuration: scalingDuration, delay: 0.0, options: .curveEaseIn, animations: { () -> Void in
self.transform = CGAffineTransform(scaleX: easeScale, y: easeScale)
}, completion: { (completed: Bool) -> Void in
UIView.animate(withDuration: easingDuration, delay: 0.0, options: .curveEaseOut, animations: { () -> Void in
self.transform = .identity
}, completion: { (completed: Bool) -> Void in
})
})
}
func zoomOutWithEasing(duration: TimeInterval = 0.2, easingOffset: CGFloat = 0.2) {
let easeScale = 1.0 + easingOffset
let easingDuration = TimeInterval(easingOffset) * duration / TimeInterval(easeScale)
let scalingDuration = duration - easingDuration
UIView.animate(withDuration: easingDuration, delay: 0.0, options: .curveEaseOut, animations: { () -> Void in
self.transform = CGAffineTransform(scaleX: easeScale, y: easeScale)
}, completion: { (completed: Bool) -> Void in
UIView.animate(withDuration: scalingDuration, delay: 0.0, options: .curveEaseOut, animations: { () -> Void in
self.transform = CGAffineTransform(scaleX: 0.0, y: 0.0)
}, completion: { (completed: Bool) -> Void in
})
})
}
}
用法非常简单:
let button = UIButton(frame: frame)
button.zoomIn()
Swift 3版本
extension UIView {
func zoomIn(duration: TimeInterval = 0.2) {
self.transform = CGAffineTransform(scaleX: 0.0, y: 0.0)
UIView.animate(withDuration: duration, delay: 0.0, options: [.curveLinear], animations: { () -> Void in
self.transform = CGAffineTransform.identity
}) { (animationCompleted: Bool) -> Void in
}
}
func zoomOut(duration: TimeInterval = 0.2) {
self.transform = CGAffineTransform.identity
UIView.animate(withDuration: duration, delay: 0.0, options: [.curveLinear], animations: { () -> Void in
self.transform = CGAffineTransform(scaleX: 0.0, y: 0.0)
}) { (animationCompleted: Bool) -> Void in
}
}
func zoomInWithEasing(duration: TimeInterval = 0.2, easingOffset: CGFloat = 0.2) {
let easeScale = 1.0 + easingOffset
let easingDuration = TimeInterval(easingOffset) * duration / TimeInterval(easeScale)
let scalingDuration = duration - easingDuration
UIView.animate(withDuration: scalingDuration, delay: 0.0, options: .curveEaseIn, animations: { () -> Void in
self.transform = CGAffineTransform(scaleX: easeScale, y: easeScale)
}, completion: { (completed: Bool) -> Void in
UIView.animate(withDuration: easingDuration, delay: 0.0, options: .curveEaseOut, animations: { () -> Void in
self.transform = CGAffineTransform.identity
}, completion: { (completed: Bool) -> Void in
})
})
}
func zoomOutWithEasing(duration: TimeInterval = 0.2, easingOffset: CGFloat = 0.2) {
let easeScale = 1.0 + easingOffset
let easingDuration = TimeInterval(easingOffset) * duration / TimeInterval(easeScale)
let scalingDuration = duration - easingDuration
UIView.animate(withDuration: easingDuration, delay: 0.0, options: .curveEaseOut, animations: { () -> Void in
self.transform = CGAffineTransform(scaleX: easeScale, y: easeScale)
}, completion: { (completed: Bool) -> Void in
UIView.animate(withDuration: scalingDuration, delay: 0.0, options: .curveEaseOut, animations: { () -> Void in
self.transform = CGAffineTransform(scaleX: 0.0, y: 0.0)
}, completion: { (completed: Bool) -> Void in
})
})
}
}