我的代码在下面，但是动画是立即发生的，即View不再可见:UIView*leftDoorView=[[UIViewalloc]initWithFrame:CGRectMake(0,0,self.view.bounds.size.width/2,self.view.bounds.size.height)];leftDoorView.backgroundColor=[UIColorgreenColor];leftDoorView.layer.anchorPoint=CGPointMake(0.0,0.5);[self.viewaddSubview:leftDoorView];leftDoo