Question

我有一个图书馆应用程序，当您点击每个库时，它会提取一个架子列表，一旦点击，就会拉出每个架子上的书籍列表。我在问一个＆＃34; +＆＃34;在导航栏中仅显示可以添加书籍的书籍列表的视图。我试过以编程方式和故事板添加它，但是，虽然应用程序构建和运行正常，但按钮从未出现过。任何建议都会很棒！

下面是我的bookTableViewController代码：

import UIKit

class bookTableViewController: UITableViewController {

@IBOutlet var addBookButton: UIBarButtonItem!

var currentShelf = Shelf()

override func viewDidLoad() {
    super.viewDidLoad()

    self.navigationItem.title = "Shelf"

    navigationItem.rightBarButtonItem?.title = "Add"

    self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")

}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return currentShelf.allBooksOnShelf.count
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    var cell:UITableViewCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell

    cell.textLabel.text = currentShelf.allBooksOnShelf[indexPath.row].bookName

    return cell
}

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    if currentShelf.allBooksOnShelf[indexPath.row].hasBeenRead == false{
        currentShelf.allBooksOnShelf[indexPath.row].hasBeenRead = true
    var alert = UIAlertController(title: "Read Book", message: "Thanks For Reading!", preferredStyle: UIAlertControllerStyle.Alert)
    alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil))
    self.presentViewController(alert, animated: true, completion: nil)

    }
    else{
        currentShelf.allBooksOnShelf[indexPath.row].hasBeenRead = false
        var alert = UIAlertController(title: "Read Book", message: "You Just UnRead A Book...", preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil))
        self.presentViewController(alert, animated: true, completion: nil)

    }

}

override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {

    if editingStyle == .Delete {

        // Delete the row from the data source
        currentShelf.allBooksOnShelf.removeAtIndex(indexPath.row)
        self.tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)

    } else if editingStyle == .Insert {
        // Create a new instance of the appropriate class, insert it into the array, and add a        new row to the table view
    }
    }


 }

以下是我用来从Shelf Table View Controller推送到TableVC的代码：

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    let vc = bookTableViewController()

    vc.currentShelf = currentLibrary.allShelves[indexPath.row]

    navigationController?.pushViewController(vc, animated: true)


}

由于

Answer 1

这是因为您需要创建rightBarButtonItem，而不仅仅是设置标题。试试这个：

var barButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Add, target: self, action: @"addTapped:")
self.navigationItem.rightBarButtonItem = barButton

Swift - 嵌套导航控制器缺失＆＃34;编辑＆＃34;按键

1 个答案: