iOS应用程序内存泄漏

Question

我的 NavigationController 有两个控制器。当我去第二个控制器时，一切都很好。但是，当我返回第一个控制器然后再次返回第二个时，使用的内存量会增加（每次第二个控制器再次加载时，内存都会永久增长）。在处理重复加载的viewDidLoad 方法中，_loadServicesView、_complexTableView 和_selectTypeCarView 等对象被设置为 nil，然后再次创建。为什么这些对象在从第二个控制器转换到第一个控制器时没有被销毁？另外，如果它们没有被销毁，为什么它们被设置为零？

下面是第二个控制器的相关代码：

@interface WCselectTypeViewController () <UITableViewDataSource, UITableViewDelegate>

@property (strong, nonatomic) WCloadServices       *loadServices; 

@property (strong, nonatomic) WCloadView           *loadServicesView;

@property (strong, nonatomic) WCselectTypeView     *selectTypeView;

@property (strong, nonatomic) WCcomplexTableView   *complexTableView;

@end

@implementation WCselectTypeViewController


- (void)loadView
{
     [super loadView];
}

- (void)viewDidLoad
{
     [super viewDidLoad];

     if (!_loadServicesView)
     {
         _loadServicesView = [[WCloadView alloc] init];
         [_loadServicesView setDelegate:self];
         [self.view addSubview:_loadServicesView];
     }

     if (!_complexTableView)
     {
         _complexTableView = [[WCcomplexTableView alloc] initWithViewConfig:[WCappConfig getViewConfig]];
         _complexTableView.alpha = 0;
         _complexTableView.delegate = self;
         _complexTableView.dataSource = self;
         [self.view addSubview:_complexTableView];
    }

     if (!_selectTypeView)
     {
         _selectTypeView = [[WCselectTypeCarView alloc] initWithViewConfig:[WCappConfig getViewConfig] andType:[[WCorderStored sharedStore] getType]];
         [_selectTypeCarView setDelegate:self];
         [self.view addSubview:_selectTypeView];
     }
 }

Answer 1

我认为这是我遇到的相同（错误/）行为。更改 VC 会将它们放入堆栈；如果使用后退箭头，内存应该会减少，不是吗？

我使用 PageViewController 代替了导航控制器。

这是我的工作解决方案：

- (void)viewDidLoad
{
    [super viewDidLoad];


    // Create the data model
    _pageTitles = @[@"1", @"2", @"3", @"4", @"5"];
//    _pageImages = @[@"page1.png", @"page2.png", @"page3.png", @"page4.png"];

    // Create page view controller

    self.pageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageViewController"];
    self.pageViewController.dataSource = self;

    PageContentViewController *startingViewController = [self viewControllerAtIndex:0];
    NSArray *viewControllers = @[startingViewController];
    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

    // Change the size of page view controller
    self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - 30);

    [self addChildViewController:_pageViewController];
    [self.view addSubview:_pageViewController.view];
    [self.pageViewController didMoveToParentViewController:self];

}

- (PageContentViewController *)viewControllerAtIndex:(NSUInteger)index
{

    if (([self.pageTitles count] == 0) || (index >= [self.pageTitles count])) {
        return nil;
    }
    // Create a new view controller and pass suitable data.


//    pageContentViewController.imageFile = self.pageImages[index];

    PageContentViewController *pageContentViewController;
    if (index == 0){
        pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailView1"];
        pageContentViewController.pageIndex = index;
    }
    else if (index == 1){
        pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailView2"];
        pageContentViewController.pageIndex = index;
    }
    else if (index == 2){
        pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailView3"];
        pageContentViewController.pageIndex = index;
    }
    else if (index == 3){
        pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailView4"];
        pageContentViewController.pageIndex = index;
    }
    else if (index == 4){
        pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailView4"];
        pageContentViewController.pageIndex = index;
    }

    return pageContentViewController;

}