presentViewController 添加一个返回手势

    UIScreenEdgePanGestureRecognizer *edgeGes = [[UIScreenEdgePanGestureRecognizer alloc]  initWithTarget: self  action:@selector(edgePan:)];
    edgeGes.edges = UIRectEdgeLeft;
    [self.view addGestureRecognizer:edgeGes];



-(void)edgePan:(UIPanGestureRecognizer *)recognizer{
    [self dismissViewControllerAnimated:YES completion:^{
        
    }];
}