如何将更多图标压缩到导航栏或工具栏中

Question

我想在我的导航栏中再添一个图标，但无法弄清楚如何调整宽度以获得更多空间。

使用标准的BarButtonItems并使用故事板构建，iPad上的纵向模式似乎有14个图标限制。这是一款仅限iPad的应用程序。

这是我添加第15个图标时得到的结果：

您可以看到＆＃34;页面＆＃34;图标位于＆＃34; +＆＃34;图标。

我在界面构建器中找不到允许调整BarButton大小的设置。我似乎无法找到程序化的解决方案。但是，我可以找到许多具有16个或更多图标的应用程序示例。

我还没有尝试将导航栏更改为工具栏（并且无论如何都没有真正看到明显的解决方案）。

任何人都知道如何挤出更多空间，以便我可以再插入一个图标？

Answer 1

使用UIBarButtonItems创建initWithCustomView:。通过这种方式，您可以完全控制项目框架，并可以将其缩小。

实施例

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"button-image.png"]];
imageView.frame = CGRectMake(0, 0, 43, 30);

UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:imageView];

self.navigationItem.leftBarButtonItem = barButtonItem;

Answer 2

与我的实施熊有一点点问题。该事件必须由用于创建自定义视图的UIImageView处理。我发现在stackoverflow的另一个问题中更容易实现。它涉及使customView成为自定义UIButton。请参阅：UIBarButtonItem Custom view in UINavigationBar

结果：

这是我在Swift中几乎完整（但未优化）的实现。

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    let navigationBar = UINavigationBar(frame: CGRectMake(0, 20, self.view.frame.size.width, 44)) // Offset by 20 pixels vertically to take the status bar into account

    navigationBar.backgroundColor = UIColor.whiteColor()

   //create a blank image for padding
    var rect = CGRectMake(0, 0, 30, 30)  
    var size = CGSizeMake(30, 30)            
    UIGraphicsBeginImageContextWithOptions(size, false, 0)
    UIColor.clearColor().setFill()
    UIRectFill(rect)
    var image: UIImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    let notButtonBig = UIBarButtonItem(customView: UIImageView(image: image))

    rect = CGRectMake(0, 0, 4, 30)
    size = CGSizeMake(4, 30)
    UIGraphicsBeginImageContextWithOptions(size, false, 0)
    UIColor.clearColor().setFill()
    UIRectFill(rect)
    image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    let notButtonSmall = UIBarButtonItem(customView: UIImageView(image: image))



//clear - a regular old BarButton

    let clearButton =  UIBarButtonItem(title: "Clear", style:   UIBarButtonItemStyle.Plain, target: self, action: "btn_clicked:")



//undo - customView BarButton

    var undoBt: UIButton = UIButton(type: .Custom)
    undoBt.frame = CGRectMake(0, 0, 30, 30)
    undoBt.setImage(UIImage(named: "Undo"), forState: .Normal)
    undoBt.addTarget(self, action: "undoBtn:", forControlEvents: .TouchUpInside)
    var undoButton: UIBarButtonItem = UIBarButtonItem(customView: undoBt)

/*
a lot more buttons here - deleted for readability
*/

//add buttons to navBar with notButtonSmall for padding

    navigationItem.leftBarButtonItems = [ clearButton, notButtonSmall, undoButton, notButtonSmall,pencilButton, notButtonSmall, penButton, notButtonSmall,eraserButton, notButtonSmall,selectButton, notButtonSmall,pasteButton, notButtonSmall,insertButton]
    navigationItem.rightBarButtonItems = [ nextButton, notButtonSmall,previousButton, notButtonSmall, palmGuardButton, notButtonSmall, settingsButton, notButtonSmall, filesButton, notButtonSmall, sendButton, notButtonSmall, pagesButton]

    // Assign the navigation item to the navigation bar
    navigationBar.items = [navigationItem]

    // Make the navigation bar a subview of the current view controller
    self.view.addSubview(navigationBar)


    func btn_clicked(sender: UIBarButtonItem) {
        // Do something
    }

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func undoBtn(sender: AnyObject!) {
    print("undo")
}

func btn_clicked(sender: AnyObject!) {
    print("clear")
}

}