Question

我是ios中的动画新手，我试图在navigationBar中的titleView上应用动画，但是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，但我如何在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!")
})

按钮点击动画titleView

1 个答案: