动画无法正常运行

Question

我叫Lennart，目前在WWDC的游乐场里工作。 但不幸的是，我对标签设置动画有问题。 由于某些原因，标签甚至对动画都没有反应，即使所有其他标签都可以，而且它总是以一种特定的方式设置动画（从右上角移动到中间）。 这是我的代码：

startinglbl.text = "Tell us who you are"
    startinglbl.numberOfLines = 2
    startinglbl.lineBreakMode = .byWordWrapping
    startinglbl.frame = CGRect(x: 62, y: 62 + 10, width: 250, height: 100)
    startinglbl.font = UIFont(name: "HelveticaNeue-Bold", size: 40)
    startinglbl.textColor = UIColor.white
    startinglbl.textAlignment = .center
    startinglbl.alpha = 0

那是我在上面添加一些值的地方，也是我的动画：

func startingAnimation() {
    UIView.animate(withDuration: 1, animations: {
        self.startinglbl.frame = CGRect(x: 62, y: 62, width: 250, height: 100)
        self.startinglbl.alpha = 1
    }) { (true) in
        UIView.animate(withDuration: 1, animations: { 
            self.fntextfield.frame = CGRect(x: 87, y: 250, width: 200, height: 30)
            self.fntextfield.alpha = 1
        }, completion: { (true) in
            UIView.animate(withDuration: 1, animations: { 
                self.lntextfield.frame = CGRect(x: 87, y: 300, width: 200, height: 30)
                self.lntextfield.alpha = 1
            }, completion: { (true) in
                UIView.animate(withDuration: 1, animations: { 
                    self.startingbtn.frame = CGRect(x: 137, y: 450, width: 100, height: 50)
                    self.startingbtn.alpha = 1
                })
            })
        })
    }
}

非常感谢您的帮助。非常感谢

Answer 1

请记住，如果您使用自动版式。 那么基于帧的动画将不起作用。 像这样 ：

CATransition* transition = [CATransition animation];
    transition.duration = 0.4;
    transition.type = kCATransitionMoveIn;
    transition.subtype = kCATransitionFromTop;
    [_eraserSliderContainer.layer addAnimation:transition
                              forKey:kCATransition];