self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;

感谢http://www.jianshu.com/p/78fc64d387ec

- (void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];

// 禁用 iOS7 返回手势
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}
}

- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];

// 开启

if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}
}