Follow the normal program execution sequence, after self.collectionView.alpha = 1, continue to execute the following code. goto just helps you jump to this sentence in advance, it does not mean that when the normal sequence execution reaches this point, the execution of the code included in this goto will be skipped. It can be roughly understood that if there is no break in the switch, the following code will continue to be executed.
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Follow the normal program execution sequence, after self.collectionView.alpha = 1, continue to execute the following code. goto just helps you jump to this sentence in advance, it does not mean that when the normal sequence execution reaches this point, the execution of the code included in this goto will be skipped.
It can be roughly understood that if there is no break in the switch, the following code will continue to be executed.
If it were me, I would write it as
if(pangestureRecongnizer.state == UIGestureRecognizerStateEnded && offsetY<=70 && offsetY >= -70 ){
}else{
}