ios - 单击按钮时为标题 View 添加动画

Question

我是 ios 动画的新手，我正在尝试在导航栏中的 titleView 上应用动画，但下面的代码一直在说:

Cannot invoke 'animateWithDuration' with an argument list of type '(FloatLiteralConvertible, delay: FloatLiteralConvertible, options: UIViewAnimationOptions, animations: () -> () -> $T4, completion: (($T16) -> ($T16) -> $T15) -> (($T16) -> $T15) -> $T15)'

当我删除

self.navigationItem.titleView?.center = CGPointMake(10, 10)

没有错误，但是如何在 titleView/title 上应用动画？

@IBAction func animateButtonTapped(sender: UIBarButtonItem) {



    UIView.animateWithDuration(0.7, delay: 1.0, options: UIViewAnimationOptions.CurveEaseOut, animations: {

        self.navigationItem.titleView?.center = CGPointMake(10, 10)

        }, completion: { finished in
            println("Basket doors opened!")
    })


}

Answer 1

UIView.animateWithDuration(0.7, delay: 1.0, options:.CurveEaseOut, animations: {
    // Optional chaining may return nil
    _ = self.navigationItem.titleView?.center = CGPointMake(10, 10)
    // return
    }, completion: {
        finished in
        println("Basket doors opened!")
})