ios - 动画起源iOS

Question

我一直在尝试创建一个在不更改原点的情况下增加 View 高度的动画(左上角和右上角边缘保持在同一位置)

import UIKit
class SampRect: UIView {
var res : CGRect?
override init(frame: CGRect) {
    super.init(frame: frame)
    self.backgroundColor = UIColor(red: 0.91796875, green: 0.91796875, blue: 0.91796875, alpha: 1)
    self.layer.cornerRadius = 5

    let recognizer = UITapGestureRecognizer(target: self, action:#selector(SampRect.handleTap(_:)))
    self.addGestureRecognizer(recognizer)


}

func handleTap(recognizer : UITapGestureRecognizer) {

    let increaseSize = CABasicAnimation(keyPath: "bounds")
    increaseSize.delegate = self
    increaseSize.duration = 0.4
    increaseSize.fromValue = NSValue(CGRect: frame)
    res = CGRect(x: self.frame.minX, y: self.frame.minY, width: frame.width, height: self.frame.height + 10)
    increaseSize.toValue = NSValue(CGRect: res!)

    increaseSize.fillMode = kCAFillModeForwards
    increaseSize.removedOnCompletion = false

    layer.addAnimation(increaseSize, forKey: "bounds")


}

override func animationDidStop(anim: CAAnimation, finished flag: Bool) {
    self.frame = res!
}


required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
   }
}

但是动画从中间增加尺寸(将顶部边缘向上推，将底部边缘向下推) 我缺少什么？

Answer 1

你可以试试这个。

        let newheight:CGFloat = 100.0
        UIView.animateWithDuration(0.5) {

            self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width, newheight)

        }