Swift 将动画与完成合二为一

Question

我有 5 个动画，它们只是页面上的对象，在用户点击登录按钮后会掉落。我对每个后续的延迟增加了 0.3。我想知道是否有一种更简洁、更高效的方式来编写这段代码。

    func loggedInAnimate1(){

    UIView.animateWithDuration(2,
                               delay: 0.0,
                               options: .CurveEaseIn,
                               animations: {
                                self.newUser.center.y += self.view.bounds.width

        }, completion: nil)

}

func loggedInAnimate2(){

    UIView.animateWithDuration(2,
                               delay: 0.3,
                               options: .CurveEaseIn,
                               animations: {
                                self.loginButton.center.y += self.view.bounds.width

        }, completion: nil)

}

func loggedInAnimate3(){

    UIView.animateWithDuration(2,
                               delay: 0.6,
                               options: .CurveEaseIn,
                               animations: {
                                self.loginPasswordTextField.center.y += self.view.bounds.width

        }, completion: nil)

}

func loggedInAnimate4(){

    UIView.animateWithDuration(2,
                               delay: 0.9,
                               options: .CurveEaseIn,
                               animations: {
                                self.loginEmailTextField.center.y += self.view.bounds.width

        }, completion: nil)

}

func loggedInAnimate5(){

    UIView.animateWithDuration(3,
                               delay: 1.2,
                               options: .CurveEaseIn,
                               animations: {
                                self.logo.center.y += self.view.bounds.height

        }, completion: nil)

}

最后一个我想调用另一个函数...这一切都可能吗？谢谢

Answer 1

您可以使用完成闭包来触发下一个动画。这样您就不需要使用延迟，并且可以嵌套动画。

UIView.animateWithDuration(2, delay: 0, options: .CurveEaseIn, animations: {
    self.newUser.center.y += self.view.bounds.width
}, completion: { _ in
    UIView.animateWithDuration(2, delay: 0, options: .CurveEaseIn, animations: {
        self.loginButton.center.y += self.view.bounds.width
    }, completion: { _ in
        // And so on...
    })
})