在自定义返回按钮的时候，侧滑手势返回往往默认失效了，怎么让侧滑有效呢
UIButton *btn =[UIButton buttonWithType:UIButtonTypeCustom];
[btn setTitle:@"返回" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
btn.frame=CGRectMake(0, 0, 60, 40);
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
UIBarButtonItem *item =[[UIBarButtonItem alloc]initWithCustomView:btn];
self.navigationItem.leftBarButtonItem=item;
添加下面这一句代码即可
self.navigationController.interactivePopGestureRecognizer.delegate=(id)self;
