如何在iOS 7中仅针对一个视图禁用后退手势

问题描述

我正在尝试使用以下代码集为视图控制器禁用后退手势。

I am trying to disable the back gesture for my view controller using the following set of code.

在 FirstViewController.m ，我正在设置的代表：interactivePopGestureRecognizer

- (void) viewWillLoad {

    // Other stuff..
    self.navigationController.interactivePopGestureRecognizer.delegate = self;
}

然后实施< UIGestureRecognizerDelegate> 方法并返回否。

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

     return NO;
}

在dealloc中我将委托设置为nil。 （我在某处看过，在iOS 7中你必须手动将代表设置为nil）

And in dealloc I'm setting the delegate to nil. (I have read somewhere that in iOS 7, you have to manually set the delegates to nil)

- (void)dealloc {

    self.navigationController.delegate = nil;
    self.navigationController.interactivePopGestureRecognizer.delegate = nil;
}

这适用于 FirstViewController 。但是，当我将 SecondViewController 推送到此时，手势也无效。如何才能在FirstViewController中禁用手势？

This works in the FirstViewController. But when I push SecondViewController to this, the gesture does not work on that either. How can I disable the gesture in FirstViewController only?

当我弹出 FirstViewController 转到 RootViewController 然后再次尝试推送 FirstViewController ，我得到对象解除分配错误：

Also when I pop FirstViewController to go to RootViewController and then try to push FirstViewController again, I get the object deallocated error :

[FirstViewController gestureRecognizer:shouldReceiveTouch:]: message sent to deallocated instance 0x14ed0280

为什么除了将委托设置为nil之外我还需要做什么？或者我将它设置在错误的位置？

Why else do I need to do other than setting the delegates to nil? Or am I setting it in the wrong place?

推荐答案

在FirstViewController中尝试以下未经测试的代码：

Try the below untested code in your FirstViewController :

-(void) viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}

-(void) viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}

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