如何以编程方式将 UIToolbar 添加到 iOS 应用程序？

Question

似乎找不到按照问题标题描述的教程。我想了解 UIToolbar 需要在哪里声明以及如何将其放到我的视图层上。

Answer 1

如果您使用的是 UINavigationController，那么默认情况下工具栏会附带它。

您可以使用以下代码行添加它：

self.navigationController.toolbarHidden = NO;

要将按钮添加到工具栏，您可以使用以下代码：

UIBarButtonItem *flexibleItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
UIBarButtonItem *item1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:nil];
UIBarButtonItem *item2 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:nil];

flexibleItem 用于保持我们上面创建的两个按钮之间的适当距离。

现在您可以添加这三个项目以使它们在您的视图中可见。

NSArray *items = [NSArray arrayWithObjects:item1, flexibleItem, item2, nil];   
self.toolbarItems = items;

我希望它对你有用。

Answer 2

UIToolbar 是 UIView 的子类，因此您的问题的简短答案是：就像任何其他视图一样。

具体来说，这是如何以编程方式创建工具栏的示例。此代码片段中的上下文是视图控制器的 viewDidLoad。

UIToolbar *toolbar = [[UIToolbar alloc] init];
toolbar.frame = CGRectMake(0, 0, self.view.frame.size.width, 44);
NSMutableArray *items = [[NSMutableArray alloc] init];
[items addObject:[[[UIBarButtonItem alloc] initWith....] autorelease]];
[toolbar setItems:items animated:NO];
[items release];
[self.view addSubview:toolbar];
[toolbar release];

请参阅 UIToolbar 和 UIBarButtonItem< /a> 文档以获取详细信息。

Answer 3

iOS 11+ SWIFT 4 + Xcode 9 + 约束

适用于横向 + 纵向

    override func viewDidLoad() {
        super.viewDidLoad()
        print(UIApplication.shared.statusBarFrame.height)//44 for iPhone x, 20 for other iPhones
        navigationController?.navigationBar.barTintColor = .red


        let toolBar = UIToolbar()
        var items = [UIBarButtonItem]()
        items.append(
            UIBarButtonItem(barButtonSystemItem: .save, target: nil, action: nil)
        )
        items.append(
            UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(tapsOnAdd))
        )
        toolBar.setItems(items, animated: true)
        toolBar.tintColor = .red
        view.addSubview(toolBar)

        toolBar.translatesAutoresizingMaskIntoConstraints = false


        if #available(iOS 11.0, *) {
            let guide = self.view.safeAreaLayoutGuide
            toolBar.trailingAnchor.constraint(equalTo: guide.trailingAnchor).isActive = true
            toolBar.leadingAnchor.constraint(equalTo: guide.leadingAnchor).isActive = true
            toolBar.bottomAnchor.constraint(equalTo: guide.bottomAnchor).isActive = true
            toolBar.heightAnchor.constraint(equalToConstant: 44).isActive = true

        }
        else {
            NSLayoutConstraint(item: toolBar, attribute: .bottom, relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1.0, constant: 0).isActive = true
            NSLayoutConstraint(item: toolBar, attribute: .leading, relatedBy: .equal, toItem: view, attribute: .leading, multiplier: 1.0, constant: 0).isActive = true
            NSLayoutConstraint(item: toolBar, attribute: .trailing, relatedBy: .equal, toItem: view, attribute: .trailing, multiplier: 1.0, constant: 0).isActive = true

            toolBar.heightAnchor.constraint(equalToConstant: 44).isActive = true
        }

    }

Answer 4

要在底部显示工具栏，左侧的两个按钮和右侧的另一个按钮之间有空间

-(void)showToolBar
{
    CGRect frame, remain;
    CGRectDivide(self.view.bounds, &frame, &remain, 44, CGRectMaxYEdge);
    UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:frame];
    UIBarButtonItem *button1 = [[UIBarButtonItem alloc] initWithTitle:@"Send" style:UIBarButtonItemStyleDone target:self action:nil];
    UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    UIBarButtonItem *button2=[[UIBarButtonItem alloc]initWithTitle:@"Cancel" style:UIBarButtonItemStyleDone target:self action:nil];
    [toolbar setItems:[[NSArray alloc] initWithObjects:button1,spacer,button2,nil]];
    [toolbar setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin];
    [self.view addSubview:toolbar];
}

注意：要在按钮之间留出空间，我们添加如下行

UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];

< strong>并添加间隔符

[toolbar setItems:[[NSArray alloc] initWithObjects:button1,spacer,button2,nil]];

Answer 5

尝试这个简单的方法：

    UIToolbar *toolbar = [[UIToolbar alloc] init];
    toolbar.frame = CGRectMake(0, 0, 300, 44);
    UIBarButtonItem *button1 = [[UIBarButtonItem alloc] initWithTitle:@"Send" style:UIBarButtonItemStyleDone target:self action:@selector(sendAction)];

    UIBarButtonItem *button2=[[UIBarButtonItem alloc]initWithTitle:@"Cancel" style:UIBarButtonItemStyleDone target:self action:@selector(cancelAction)];

    [toolbar setItems:[[NSArray alloc] initWithObjects:button1,button2, nil]];
    [self.view addSubview:toolbar];

Answer 6

这就是您在应用中实现 UIToolbar 的方式。

// declare frame of uitoolbar 
UIToolBar *lotoolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 170, 320, 30)];
[lotoolbar setTintColor:[UIColor blackColor]];

UIBarButtonItem *button1 = [[UIBarButtonItem alloc] initWithTitle:@"DATE" style:UIBarButtonItemStyleDone target:self action:@selector(dateToolbardoneButtonAction)];

UIBarButtonItem *button2=[[UIBarButtonItem alloc]initWithTitle:@"TIME" style:UIBarButtonItemStyleDone target:self action:@selector(timeToolbarbuttonAction)];

[lotoolbar setItems:[[NSArray alloc] initWithObjects:button1, nil];
[lotoolbar setItems:[[NSArray alloc] initWithObjects:button2, nil];
[mainUIview addSubview:lotoolbar];

您还应该必须实现以下委托方法：

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
}
- (void)textViewDidChange:(UITextView *)textView{
    NSLog(@"textViewDidChange:");
}

- (void)textViewDidChangeSelection:(UITextView *)textView{
    NSLog(@"textViewDidChangeSelection:");
}

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
    [lotextview setText:@""];
    NSLog(@"textViewShouldBeginEditing:");
    return YES;
}

Answer 7

Swift 5：

结果：

代码：

override func viewDidLoad() {
    
    super.viewDidLoad()
    
    self.view.backgroundColor = .systemBackground
    
    self.navigationController?.isToolbarHidden = false
    
    let toolBarItems = ["Tab1","Tab2"]
    segmentedControl = UISegmentedControl(items: toolBarItems)
    segmentedControl.selectedSegmentIndex = 0

    let space = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: self, action: nil)
    let cameraBarButtonItem = UIBarButtonItem(barButtonSystemItem: .camera, target: self, action: nil)
    let segmentedControlBarButtonItem = UIBarButtonItem(customView: segmentedControl)
    let addBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addAction))
    self.toolbarItems = [cameraBarButtonItem, space, segmentedControlBarButtonItem, space, addBarButtonItem]
    
}

@objc func addAction() {
    print("Add")
}