iOS 最常用的动画

Swift实现iOS核心动画实战

原创于 2021-12-22 11:30:48 发布 · 261 阅读

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CC 4.0 BY-SA版权

文章标签：

#ios #动画 #swift

本文深入探讨了如何使用Swift编程语言在iOS平台上创建各种常见动画，包括视图平移、旋转、缩放等效果，详细讲解了CAAnimation和UIView动画的相关API，适合iOS开发者学习提升动画技能。

Swift

        let basicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
        basicAnimation.toValue = 0.1
        basicAnimation.duration = 0.5
        basicAnimation.repeatCount = MAXFLOAT
        basicAnimation.autoreverses = true
        basicAnimation.fillMode = .forwards
        basicAnimation.isRemovedOnCompletion = false
        view.layer.allowsEdgeAntialiasing = true
        view.layer.add(basicAnimation, forKey: "transform.rotation.z")
        CATransaction.commit()

// 可修改旋转中心
func addAnimateWith(view: UIView) {
        UIView.animate(withDuration: 0.35, delay: 1.0, options: .allowAnimatedContent) {
            let oldOrigin = view.frame.origin
            view.layer.anchorPoint = CGPoint(x: 0, y: 1)
            let newOrigin = view.frame.origin
            let transition: CGPoint = CGPoint(x: newOrigin.x - oldOrigin.x, y: newOrigin.y - oldOrigin.y)
            view.center = CGPoint(x: view.center.x - transition.x, y: view.center.y - transition.y)
            view.transform = CGAffineTransform(rotationAngle: CGFloat(-12 * Float.pi / 180))
        } completion: { finished in
            if finished {
                UIView.animate(withDuration: 0.35) {
                    view.transform = CGAffineTransform.identity
                } completion: { finished in
                    if finished {
                        self.addAnimateWith(view: view)
                    }
                }
            }
        }
    }