UIToolBar栏按钮项目未显示Swift

时间:2016-07-02 21:34:06

标签: ios xcode swift uibarbuttonitem uitoolbar

我在不使用Interface Builder的情况下制作应用程序,因此我正在通过代码创建所有内容。

我有一个嵌入在导航控制器中的视图控制器。我知道导航控制器有一个工具栏属性,我需要做的就是将布尔值设置为false以取消隐藏它。我的代码看起来像这样(它是一个在viewDidLoad中调用的函数):

func setUpToolBar(){
    navigationController?.toolbarHidden = false
    navigationController?.toolbar.barTintColor = UIColor.blackColor()
    navigationController?.toolbar.tintColor = UIColor.whiteColor()

    toolItems.append(addImageButton)
    toolItems.append(UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, target: self, action: nil))
    toolItems.append(exportImageButton)
    toolItems.append(UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, target: self, action: nil))
    toolItems.append(deleteImageButton)

    navigationController?.toolbar.setItems(toolItems, animated: false)

}

以下是我为视图控制器声明这些属性的位置和方式:

private var addImageButton : UIBarButtonItem = {
    let button = UIFactory.createBarButtonItem(nil, imageNamed: "plus button", style: .Plain, target: ImagesCollectionViewController.self, selector: #selector(ImagesCollectionViewController.addImage))
    return button
}()
private var exportImageButton : UIBarButtonItem = {
    let button = UIFactory.createBarButtonItem(nil, imageNamed: "export button", style: .Plain, target: ImagesCollectionViewController.self, selector: #selector(ImagesCollectionViewController.exportImagePressed))
    return button
}()
private var deleteImageButton : UIBarButtonItem = {
    let button = UIFactory.createBarButtonItem(nil, imageNamed: "trash button", style: .Plain, target: ImagesCollectionViewController.self, selector: #selector(ImagesCollectionViewController.deleteImagePressed))
    return button
}()

private var toolItems : [UIBarButtonItem] = []

这是我的UIFactory类的函数,它只是处理在视图控制器之外创建这些UI项的麻烦

class func createBarButtonItem(title: String?, imageNamed : String?, style : UIBarButtonItemStyle?, target : AnyObject?, selector : Selector?) -> UIBarButtonItem{
    let button = UIBarButtonItem()
    if let theTitle = title {
        button.title = theTitle
    }
    if let theImageName = imageNamed {
        button.image = UIImage(named: theImageName)
    }
    if let theStyle = style{
        button.style = theStyle
    }
    if let theTarget = target {
        button.target = theTarget
    }
    if let theSelector = selector {
        button.action = theSelector
    }
    return button
}

并且,在模拟器中运行此代码之后,这就是我所看到的(没有工具栏项目!另外,请注意我在该导航栏中有一个条形按钮项,我在代码中添加了很好)

screenshot

请有人帮助我。我陷入了这样一个荒谬的步骤,没有这个我无法继续我的应用程序。

2 个答案:

答案 0 :(得分:7)

只需删除

navigationController?.toolbar.setItems(toolItems, animated: false)

并把这行代码

self.toolbarItems = [toolItems]

答案 1 :(得分:1)

我改变了

  

navigationController!.toolbar.setItems(toolItems,animated:true)

  

toolbarItems = toolItems

并为我工作。