UIView动画不会移动视图

Question

This is the code I use for the animation.

        NSLog(@"SlideLoadingViewOut : frame: X:%f, Y:%f", self.loadingView.frame.origin.x, self.loadingView.frame.origin.y);
        [UIView animateWithDuration:time animations:^{
            self.loadingView.frame = CGRectMake(320, 0, self.loadingView.frame.size.width, self.loadingView.frame.size.height);
            NSLog(@"SlideLoadingViewOut : frame: X:%f, Y:%f", self.loadingView.frame.origin.x, self.loadingView.frame.origin.y);
        } completion:^(BOOL finished) {
            NSLog(@"SlideLoadingViewOut : frame: X:%f, Y:%f", self.loadingView.frame.origin.x, self.loadingView.frame.origin.y);
        }];

This is the output in the console I get:

Before the animation starts:

SlideLoadingViewOut : frame: X:0.000000, Y:0.000000

In the animation block:

SlideLoadingViewOut : frame: X:320.000000, Y:0.000000

In the completion block:

SlideLoadingViewOut : frame: X:0.000000, Y:0.000000

The view doesn't move. Anyone knows why this might happen.

Answer 1

Wild speculation

for some reason the animation block doesn't like CGRectMake being within the block, try creating it earlier.

Answer 2

Well, someone answered this earlier but for some reason his comment disappeared. Apperntley I was changing the frame on a different thread than the main, I executed it on the main thread using, and it worked.

dispatch_async(dispatch_get_main_queue(), ^{
   // do work here
});