ModalViewController 使用选择器关闭视图

Question

我有一个从我的主视图显示的模态视图控制器，我在视图的右上角添加了一个“完成”按钮（导航控制器）。但是，我无法让选择器调用正确的方法。这是我用来设置模态视图的代码：

    GraphView *graphView = [[[GraphView alloc] initWithNibName:@"GraphView" bundle:nil] autorelease];

//Set values in the graphView view
[graphView setInterest:interestRateSlider.value / 10];
[graphView setMonths: (loanTermSlider.value / 2.0) * 12]; // Years * 12 = months
[graphView setPrincipal:[principal intValue]];

//show the graph view as a modal navigation controller view
UINavigationController *graphNavigationController = [[UINavigationController alloc] initWithRootViewController:graphView];
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc ] 
                               initWithBarButtonSystemItem:UIBarButtonSystemItemCancel 
                               target:graphView
                               action:@selector(dismissView:)];
graphView.navigationItem.rightBarButtonItem = doneButton;
[graphNavigationController.navigationItem.rightBarButtonItem setTitle:@"Done"];
[graphView.navigationItem setTitle:@"Graph"];
[self presentModalViewController:graphNavigationController animated:YES];
[graphNavigationController release];
[doneButton release];

然后在我的 graphView 类中我有方法：

 -(void) dismissView {
     [self dismissModalViewControllerAnimated: YES];
 }

但是，在运行代码时，我得到了无法识别的选择器。选择器正在尝试调用 UINavigationController 变量上的方法。如何让选择器调用正确的方法？

谢谢

Answer 1

你在调用选择器时弄错了：

UIBarButtonItem *doneButton = [[UIBarButtonItem alloc ] 
                           initWithBarButtonSystemItem:UIBarButtonSystemItemCancel 
                           target:graphView
                           action:@selector(dismissView:)];

当dismissView被定义为

-(void) dismissView;

你应该将dismissView定义为

-(void) dismissView:(id)sender;

或者不带冒号的称呼

UIBarButtonItem *doneButton = [[UIBarButtonItem alloc ] 
                           initWithBarButtonSystemItem:UIBarButtonSystemItemCancel 
                           target:graphView
                           action:@selector(dismissView)];