如何在Swift中完成动画？

Question

在我的测验的下一个问题要加载之前,我试着让按钮"摇晃".

动画看起来像

var timer = NSTimer()
    UIView.animateWithDuration(0.1, animations: {
        self.IMGVIEWcat.center = CGPointMake(self.IMGVIEWcat.center.x + 2, self.IMGVIEWcat.center.y)
    })
    UIView.animateWithDuration(0.2, animations: {
        self.IMGVIEWcat.center = CGPointMake(self.IMGVIEWcat.center.x - 4, self.IMGVIEWcat.center.y)
    })
    UIView.animateWithDuration(0.3, animations: {
            self.IMGVIEWcat.center = CGPointMake(self.IMGVIEWcat.center.x + 2, self.IMGVIEWcat.center.y)
    })

在此之后调用以下函数

    func QueryInformations(){
        println("QueryInformationsStart")
        self.ActivityIndicator.hidden = false
        ObjectIDsArrayCount = ObjectIDsArray.count
        var RandomQuestion = Int(arc4random_uniform(ObjectIDsArray.count + 0))
        var QuestionID:String = ObjectIDsArray[RandomQuestion]
        var query : PFQuery = PFQuery(className: "AddonQuiz")
        query.getObjectInBackgroundWithId(QuestionID){
            (ObjectHolder : PFObject!, error : NSError!) -> Void in
...

现在动画开始但是下一个问题加载即时,是否有一些容易等待初学者实现"等待"直到动画完成？

我试着设定

var complet == true 

在动画中

并在查询功能

if complet = true {....

但是这对我来说不起作用,我也发现了一些关于完成处理程序的信息,但是在我的代码中没有得到它.

Answer 1

如果要completion在动画结束时使用块,则应使用带有delay和options参数的构造.

UIView.animateWithDuration(0.3, delay: 0.0, options: UIViewAnimationOptions.CurveLinear, animations: { 
// put here the code you would like to animate
    self.IMGVIEWcat.center = CGPointMake(self.IMGVIEWcat.center.x + 2, self.IMGVIEWcat.center.y)

}, completion: {(finished:Bool) in
// the code you put here will be compiled once the animation finishes
    QueryInformations() 
})