ios – gestureRecognizer shouldReceiveTouch持久存在于解除分配的视图中导致崩溃

我有一个相当简单的UITableView,它在栈上推送一个新视图.新视图有一个这样初始化的gestureRecognizer

@synthesize swipeGestureLeft;


    - (void)viewDidLoad
{
        swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(toggleViewLeft)];
        swipeGestureLeft.numberOfTouchesRequired = 1;
        swipeGestureLeft.delegate=self;
        swipeGestureLeft.direction = (UISwipeGestureRecognizerDirectionLeft);
        [self.view addGestureRecognizer:swipeGestureLeft];
}

我也称为委托方法

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

    if (viewShown==1) {
        return NO;
    }
    return YES;
}

在我所拥有的dealloc方法中

- (void)dealloc {
    NSLog(@"I AM IN DEALLOC");


    swipeGestureLeft.delegate=nil;
    [self.view removeGestureRecognizer:swipeGestureLeft];
    swipeGestureLeft=nil;



}

在我的.h文件中

@interface MyViewController : UIViewController <UIGestureRecognizerDelegate>

现在,当我回到我的表视图时,视图被取消分配(我可以看到因为NSLog触发)现在当我尝试向下滑动我的表视图时,应用程序崩溃：

[MyViewController gestureRecognizer:shouldReceiveTouch:]: message sent to deallocated instance

如何确保在取消分配视图后不调用委托方法.

解决：我正在使用新的iOS7
navigationController.interactivePopGestureRecognizer并将其委托设置为“self”.

在重新分配后,我没有将它的委托设置为“nil”.正是这个对象保留了(不确定是否正确的单词)委托调用而不是swipeLeftGesture对象.在dealloc中将其委托设置为nil就可以了.