Question

在完成与UINavigationController项相关的问题后，我来发布我的确切问题.. 首先，我没有在MainWindow.xib中添加UINavigationController，我在AppDelegate文件中创建并添加了UINavigationController 之后在UIViewController（不在rootViewController）课程中我必须添加Done类型的右栏按钮我是将其添加到searchbarDelegate方法中，显示为粗体： -

- (void) searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar {

//This method is called again when the user clicks back from teh detail view.
//So the overlay is displayed on the results, which is something we do not want to happen.

if(exhibDataObj.searching)
    return;

//Add the overlay view.
if(ovController == nil)
    ovController = [[OverlayViewController alloc] initWithNibName:@"OverlayView" bundle:[NSBundle mainBundle]];

CGFloat yaxis = self.navigationController.navigationBar.frame.size.height;
CGFloat width = self.view.frame.size.width;
CGFloat height = self.view.frame.size.height;

//Parameters x = origion on x-axis, y = origon on y-axis.
CGRect frame = CGRectMake(0, yaxis, width, height);
ovController.view.frame = frame;    
ovController.view.backgroundColor = [UIColor grayColor];
ovController.view.alpha = 0.5;

ovController.rvController = self;

[self.theTableView insertSubview:ovController.view aboveSubview:self.parentViewController.view];

exhibDataObj.searching = true;
letUserSelectRow = NO;
self.theTableView.scrollEnabled = NO;

//Add the done button.
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] 
                                          initWithBarButtonSystemItem:UIBarButtonSystemItemDone 
                                          target:self action:@selector(doneSearching_Clicked:)];
 }

但这从不起作用。

任何帮助都会更加明显。

Answer 1

我已经快速测试了你的代码，它似乎对我来说很好，但是，我曾经遇到过同样的问题然后我发现在设置它之后我在viewDidLoad方法中将rightBarButtonItem设置为nil到一个按钮。你应该确保你不会以某种方式犯同样的错误。

但是，如果这对您不起作用，您可以尝试设置自定义按钮：

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 5, 30, 30)];

button.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"done.png"]];

[button addTarget:self action:@selector(doneButtonClicked) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *customItem = [[UIBarButtonItem alloc] initWithCustomView:button];

self.navigationController.visibleViewController.navigationItem.rightBarButtonItem = customItem;

UINavigationController右栏按钮没有显示

1 个答案: