iphone - 在两个 View 之间翻转时如何修复 iOS 泄漏

Question

在主 uiviewcontroller 和帮助 uiviewcontroller 之间来回切换时，我的 iPhone 应用程序严重泄漏。

这里是主视图的源代码，后面是帮助 View 的源代码。

主视图 - 翻页帮助......................................

// Changes from operational view to Help view.
- (IBAction)showHelp:(id)sender 
{    
    // End trial mode:
    self.stop_trial_if_started; 
    self.rename_trial_if_edited;

    // Switch to trial help:
    help_view_context = 0;

    HelpView *controller = [[HelpView alloc] initWithNibName:@"HelpView" bundle:nil];
    controller.delegate = self;

    controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:controller animated:YES];

    [controller release];
}

帮助 View - 初始化......................................

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor viewFlipsideBackgroundColor];   

    help_scroll.editable = FALSE;

  return;
}

帮助 - 返回主视图......................................

// User clicked the button to return to operational view:
- (IBAction)done:(id)sender {
    NSLog(@"help-  done");
    if( help_view_context == 0 ) {
        [self.delegate trial_help_DidFinish:self];  
    }else{
          [self.delegate file_help_DidFinish:self]; 
    }
}

主视图 - 从帮助中返回......................................................

// Inits operational view when user changes from Help view back to operational view.
- (void)trial_help_DidFinish:(HelpView *)controller {
    NSLog(@"trial_help_DidFinish");
    [self dismissModalViewControllerAnimated:YES];
    self.init_trial_operation;
}

Answer 1

每次调用 showHelp: 时，您正在创建一个引用计数为 1 和本地引用的 Controller :

HelpView *controller = [[HelpView alloc] initWithNibName:@"HelpView" bundle:nil];

您将在此方法结束时丢失对它的引用。

您碰巧在 done:(self)和 *_help_didFinish( Controller )中引用了它，但您从未在这些位置中的任何一个中释放它。关闭 Controller 没问题，但您还必须释放它。

(另一种选择是永远不创建第二个，并保持原始 iVar。)