以编程方式完成时未显示工具栏

Question

我从 IB 中删除了 ToolBar 控件，而是尝试通过代码创建。我尝试了以下在网上找到的代码。我没有在“viewWillAppear”中编写此代码，而是将代码放在同一个 UIViewController 导航栏中的“栏按钮项”中。

- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];

//Initialize the toolbar
toolbar = [[UIToolbar alloc] init];
toolbar.barStyle = UIBarStyleDefault;

//Set the toolbar to fit the width of the app.
[toolbar sizeToFit];

//Caclulate the height of the toolbar
CGFloat toolbarHeight = [toolbar frame].size.height;

//Get the bounds of the parent view
CGRect rootViewBounds = self.parentViewController.view.bounds;

//Get the height of the parent view.
CGFloat rootViewHeight = CGRectGetHeight(rootViewBounds);

//Get the width of the parent view,
CGFloat rootViewWidth = CGRectGetWidth(rootViewBounds);

//Create a rectangle for the toolbar
CGRect rectArea = CGRectMake(0, rootViewHeight - toolbarHeight, rootViewWidth,  toolbarHeight);

//Reposition and resize the receiver
[toolbar setFrame:rectArea];

//Create a button
UIBarButtonItem *infoButton = [[UIBarButtonItem alloc] initWithTitle:@"back" style:UIBarButtonItemStyleBordered target:self action:@selector(info_clicked:)];

[toolbar setItems:[NSArray arrayWithObjects:infoButton,nil]];

//Add the toolbar as a subview to the navigation controller.
//[self.navigationController.view addSubview:toolbar];

// Instead of adding to a navigation controller (which I don't have), I'm adding directly to the view and is not shown at all.

// Hiding the tabBar before I show the toolbar    
[self.tabBarController.tabBar setHidden:YES];

[self.view addSubview: self.toolbar];

我在这里做错了什么？我是否必须有可用的 info_clicked 方法（点击栏按钮项）？

Answer 1

这对我有用....

    UIToolbar *toolbar = [[UIToolbar alloc]init];
 toolbar.frame = CGRectMake(0, 0, self.view.frame.size.width,44);
 UIBarButtonItem *infoButton = [[UIBarButtonItem alloc]initWithTitle:@"back"style:UIBarButtonItemStyleBordered target:self action:@selector(info_clicked:)];
 [toolbar setItems:[NSArray arrayWithObjects:infoButton,nil]];
 [self.view addSubview:toolbar];
    [toolBar release];

您还需要方法 info_clicked: 来接收按钮操作。

- (IBAction)info_clicked:(id)sender{
   NSLog("clicked info_button");
}

Answer 2

- (void)viewDidLoad
{

    UIBarButtonItem *barItem = [[UIBarButtonItem alloc]initWithTitle:@"SHOW BAR" style:UIBarButtonItemStyleBordered target:self action:@selector(showToolbar:)];
    self.navigationItem.rightBarButtonItem = barItem;


    self.toolbar = [[UIToolbar alloc]init];
    self.toolbar.frame = CGRectMake(0, 325, self.view.frame.size.width,44);
    UIBarButtonItem *infoButton = [[UIBarButtonItem alloc]initWithTitle:@"back"style:UIBarButtonItemStyleBordered target:self action:@selector(info_clicked:)];
    [self.toolbar setItems:[NSArray arrayWithObjects:infoButton,nil]];
    [self.toolbar setHidden:YES];
    [self.view addSubview:self.toolbar];

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)showToolbar:(id)sender{
    [self.tabBarController.tabBar setHidden:YES];
    [self.toolbar setHidden:NO];
  }

当然，此代码仅适用于纵向模式的 iPhone。您必须更改横向或 iPad 的数字...并注意界面方向的变化。

Answer 3

你好朋友，这段代码也可以帮助你...

 UIToolbar *toolbar = [[UIToolbar alloc]init];
    toolbar.frame = CGRectMake(0, 960, self.view.frame.size.width,44);
    UIBarButtonItem *infoButton = [[UIBarButtonItem alloc]initWithTitle:@"back"style:UIBarButtonItemStyleBordered target:self action:@selector(info_clicked:)];
   // [toolbar setBarStyle:UIBarStyleBlackTranslucent];
[toolbar setAutoresizesSubviews:YES];
[toolbar setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
[self.view setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
[toolbar setItems:[NSArray arrayWithObjects:infoButton,nil]];
[self.tabBarController.view addSubview:toolbar];
[self.tabBarController.view bringSubviewToFront:toolbar];
[self.tabBarController.tabBar setHidden:YES];

实际上标签栏是视图控制器之一，因此您可以在标签栏本身添加工具栏，解决您以前的问题。祝您有美好的一天！！！。