如何在iOS 7中仅针对一个视图禁用后退手势

Question

我正在尝试使用以下代码集为视图控制器禁用后退手势。

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

- (void) viewWillLoad {

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

然后实施<UIGestureRecognizerDelegate>方法并返回NO。

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

     return NO;
}

在dealloc中，我将委托设置为nil。 （我已在某处读过，在iOS 7中，您必须手动将委托设置为nil）

- (void)dealloc {

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

这适用于FirstViewController。但是当我把SecondViewController推到这个时，手势也不起作用。如何才能在FirstViewController中禁用手势？

此外，当我弹出FirstViewController去RootViewController，然后尝试再次推动FirstViewController时，我得到对象解除分配错误：

[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？或者我把它放在错误的地方？

Answer 1

在FirstViewController中尝试以下未经测试的代码：

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

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

Answer 2

我最初将这些答案放在接受答案之下的评论中，但我觉得这需要作为获得更多可见性的答案。

通常情况下，您会发现接受的答案不起作用。这是因为在将视图添加到导航控制器的视图层次结构之前可以调用viewWillAppear:，因此self.navigationController将成为nil。因此，在某些情况下可能不会禁用interactivePopGestureRecognizer。你最好在viewDidAppear:中调用它。

这里的代码将起作用（假设您的视图控制器已正确添加到导航控制器的视图层次结构中）：

Objective-C的

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [[[self navigationController] interactivePopGestureRecognizer] setEnabled:NO];
}

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

迅速

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    navigationController?.interactivePopGestureRecognizer?.isEnabled = false
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    navigationController?.interactivePopGestureRecognizer?.isEnabled = true
}

Answer 3

我尝试了以上所有但是他们没有为我工作。所以我试过这个，它适用于IOS7和IOS8。 只需确保您的视图控制器实现此协议，即UIGestureRecognizerDelegate并编写下面给出的代码。

- （void）viewWillAppear：（BOOL）animated {

[super viewWillAppear : animated];

if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {

    self.navigationController.interactivePopGestureRecognizer.enabled =

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

}

- （BOOL）gestureRecognizerShouldBegin：（UIGestureRecognizer *）gestureRecognizer {

if ([gestureRecognizer isEqual:self.navigationController.interactivePopGestureRecognizer]) {

    return NO;

} else {

    return YES;

}

}

Answer 4

我发现将手势设置为禁用只是并不总是有效。它确实有效，但对我而言，它只是在我曾经使用过背景后才做到的。第二次它不会触发反馈。此外，正如约翰罗杰斯所说，使用viewDidAppear和viewWillAppear是重要的，因为navigationController否则将是nil。

修复我的是委托手势并实现shouldbegin方法返回NO：

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

    // Disable iOS 7 back gesture
    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        self.navigationController.interactivePopGestureRecognizer.enabled = NO;
        self.navigationController.interactivePopGestureRecognizer.delegate = self;
    }
}

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

    // Enable iOS 7 back gesture
    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        self.navigationController.interactivePopGestureRecognizer.enabled = YES;
        self.navigationController.interactivePopGestureRecognizer.delegate = nil;
    }
}

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    return NO;
}

Answer 5

这在xCode 7中对我有用：

override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        self.navigationController!.interactivePopGestureRecognizer!.enabled = false

}
override func viewWillDisappear(animated: Bool) {
    super.viewDidDisappear(animated)
    self.navigationController!.interactivePopGestureRecognizer!.enabled = true
}

Answer 6

对于只有一个视图，我不知道方式......但是我使用下一个代码来完全禁用滑动手势：

在你的AppDelegate.m中

if ([[UIDevice currentDevice].systemVersion floatValue] >= 7){
        self.navigationController.interactivePopGestureRecognizer.enabled = NO;
    }