ios - Dismiss UIViewController 不释放内存

Question

我有这个代码

 -(void)didPressButton:(int)tag
    {
        // Preventivi?
        if (tag == 0)
        {
            if (addPrev == nil)
                addPrev = [[avvAddPreventivoViewController alloc] init];
            addPrev.delegate = self;
            UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:addPrev];
            navigationController.navigationBarHidden     = NO;
            [[navigationController navigationBar] setBarStyle:UIBarStyleBlack];
            [self presentViewController:navigationController animated:YES completion:nil];
            addPrev = nil;

        }
    }

当我显示 addPrev 时内存增加，当显示时内存不释放。当 addPrev 关闭时，它会触发协议(protocol)方法 didCancel。我拦截它并释放 addPrev:

  -(void)didCancel
    {
        [self dismissViewControllerAnimated:YES completion:nil];
         addPrev = nil;
    }

Answer 1

Niling 还大大改进了导航 Controller 的内存分配。另外，要小心释放你可以在推送 Controller 的 dealloc 中释放的内容。

-(void)didPressButton:(int)tag
    {
        // Preventivi?
        if (tag == 0)
        {
            if (addPrev == nil)
                addPrev = [[avvAddPreventivoViewController alloc] init];
            addPrev.delegate = self;
            UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:addPrev];
            navigationController.navigationBarHidden     = NO;
            [[navigationController navigationBar] setBarStyle:UIBarStyleBlack];
            [self presentViewController:navigationController animated:YES completion:nil];
            addPrev = nil;
            navigationController = nil;

        }
    }