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我使用transitionFromView切换两个 UIView ，但是它有问题，当我将视图转换到第二个 UIView 时，它工作正常，然后我将视图转换回发生错误（第一个 UIView 的位置错误）

发生什么事？

self.primaryView.hidden = !self.primaryView.hidden
self.secondaryView.hidden = !self.secondaryView.hidden
println("\(self.primaryView)")
UIView.transitionFromView(displayingPrimary ? self.primaryView : self.secondaryView,
    toView: displayingPrimary ? self.secondaryView : self.primaryView,
    duration: 1.0,
    options: nil ) { (finish) -> Void in
        if finish {
            println("after:\(self.primaryView)")
            self.displayingPrimary = !self.displayingPrimary;
        }

}

这是控制台中的打印信息

<UIView: 0x79fe3c80; frame = (0 0; 399 349); hidden = YES; autoresize = RM+BM; layer = <CALayer: 0x79fe3d10>>
after:<UIView: 0x79fe3c80; frame = (0 0; 399 349); hidden = YES; autoresize = RM+BM; layer = <CALayer: 0x79fe3d10>>
<UIView: 0x79fe3c80; frame = (0 0; 399 349); autoresize = RM+BM; layer = <CALayer: 0x79fe3d10>>
after:<UIView: 0x79fe3c80; frame = (-436 -328; 399 349); autoresize = RM+BM; layer = <CALayer: 0x79fe3d10>>
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