swift - 在 UIView.Animate - Swift 中执行 2 CGAffineTransform

Question

嘿，所以我希望我的 View 中有一个按钮在加载一个小动画时增长。

当 View 加载时，我设置起始值

override func viewWillAppear(_ animated: Bool) {

    let shrink = CGAffineTransform(scaleX: 0, y: 0);
    let rotate = CGAffineTransform(rotationAngle: -90)
    checkButton.alpha = 0
    nextView.transform = shrink.concatenating(rotate)

}

然后在 View 中确实出现了我执行的动画

 override func viewDidAppear(_ animated: Bool) {
    UIView.animate(withDuration: 0.35, animations: {
        let grow = CGAffineTransform(scaleX: 1, y: 1);
        let rotate = CGAffineTransform(rotationAngle: 0)
        self.checkButton.alpha = 1
        self.nextView.transform = grow.concatenating(rotate)
    })
}

但只有成长动画有效？我如何才能让它从 0 级增长到 1 级并从 90 度旋转到 0 度？

干杯

Answer 1

我不太清楚为什么从 0 级开始会阻止它旋转，但在 willAppear 上提高规模就可以了。

override func viewWillAppear(_ animated: Bool) {
    let shrink = CGAffineTransform(scaleX: 0.01, y: 0.01);
    let rotate = CGAffineTransform(rotationAngle: -90)
    checkButton.alpha = 0
    nextView.transform = shrink.concatenating(rotate)
}

override func viewDidAppear(_ animated: Bool) {
    UIView.animate(withDuration: 0.35, animations: {
        let grow = CGAffineTransform(scaleX: 1, y: 1);
        let rotate = CGAffineTransform(rotationAngle: 0)
        self.checkButton.alpha = 1
        self.nextView.transform = grow.concatenating(rotate)
    })
}