Uiview.animatewithduration No animation transitions jump directly to the last

Source: Internet
Author: User

When I add the following code inside the Viewdidload () method, I find that the program runs without animating the effect, but jumps directly to the end.

        Let x = (self.view.bounds.size.width-268)/2        scanimage.frame = CGRectMake (x, 106, 268, 2)        Scanimage.contentmode = Uiviewcontentmode.scaleaspectfill        Self.view.addSubview (scanimage)                uiview.animatewithduration (2, Delay: 0, Options:UIViewAnimationOptions.Repeat, animations: {(), Void in            self.scanImage.frame = CGRectMake (x,372, 26 8, 2)        }, Completion:nil)

Through degrees Niang after a netizen said to put the code block in the Viewdidappear (Animated:bool) method, try to have animation effect. Why the hell is that? Who can tell me why?

Uiview.animatewithduration No animation transitions jump directly to the last

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