dealloc是在什么时候被调用？

我一个controller 被pop掉后，没有调用dealloc，我在dealloc里打印了，没发现调用，但是当我在viewwilldisappear里手动把里面的tableview设为nil之后，dealloc就被调用了，这是怎么回事？

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    self.navigationController.navigationBarHidden = NO;
    if (_tableView) {
        [_tableView removeFromSuperview];
        _tableView = nil;
    }
}

-(void)dealloc{
    [Util showAlertView:@"nursery vc dealloc"];
}

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先调一下[super dealloc];试试

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The dealloc method was not being called if any of the references held by a viewcontroller were still in memory.

猜测你pop的viewcontroller里的tableView里应该有一些object强引用,计数指针仍旧>0,所以viewcontroller没有调dealloc。