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[英]Swift - UITableView inside UIViewController, UITableView functions are not called
[英]Issues adding UITableView inside a UIViewController in Swift
所以我正在尝试构建一个单一的屏幕应用程序,我开始使用UIViewController。 最重要的是,有一个UITextfield,一个按钮和一个UITableView。
本质上,应用程序的预期功能是让用户在UITextField中键入单词,点击按钮,并将其显示在UITableView上。
当按钮将UITextField条目附加到不同屏幕上的UITableViewController时,我从来没有遇到过这样的问题,但由于某些原因我在UIViewController上嵌入了UITableView时出现问题...在我的故事板上,我确实将UITableView链接为UIViewController的委托和数据源,这应该不是问题。
有任何想法吗? 我的代码发布在下面。
import UIKit
var groupList:[String] = []
class ExistingGroups: UIViewController, UITextFieldDelegate, UITableViewDelegate, UITableViewDataSource
{
@IBOutlet weak var addGroup: UITextField!
@IBAction func addGroupButton(sender: AnyObject) {
self.view.endEditing(true)
var error = ""
if addGroup.text == "" {
error = "Please enter a Group!"
} else {
groupList.append(addGroup.text)
}
if error != "" {
var alert = UIAlertController(title:"Error In Form", message: error, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title:"OK", style: .Default, handler: { action in
self.dismissViewControllerAnimated(true, completion:nil)
}))
self.presentViewController(alert, animated:true, completion:nil)
}
addGroup.text = ""
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
addGroup.placeholder = "Enter Group Name"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func touchesBegan(touches:NSSet, withEvent event:UIEvent)
{
super.touchesBegan(touches, withEvent: event)
self.view.endEditing(true)
}
func textFieldShouldReturn(textField: UITextField!) -> Bool // called when 'return' key pressed. return NO to ignore.
{
textField.resignFirstResponder()
return true;
}
func tableView(tableView:UITableView, numberOfRowsInSection section: Int) -> Int {
return groupList.count
}
func numberOfSectionsInTableView(tableView:UITableView) -> Int {
return 1
}
func tableView(tableView:UITableView, cellForRowAtIndexPath indexPath:NSIndexPath) -> UITableViewCell {
var cell:UITableViewCell = tableView.dequeueReusableCellWithIdentifier("groupcell") as UITableViewCell
cell.textLabel?.text = groupList[indexPath.row]
return cell
}
}
首先以这种方式为表视图创建一个IBOutlet
:
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate {
var groupList = [String]()
@IBOutlet weak var addGroup: UITextField!
@IBOutlet weak var tableView: UITableView! //<<-- TableView Outlet
// Rest of your code..
}
之后在viewDidLoad
方法中执行此操作:
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "groupcell")
self.addGroup.delegate = self
tableView.delegate = self
tableView.dataSource = self
}
之后,您可以在将元素添加到groupList
后reload
tableView。 在这里你可以这样做:
@IBAction func addGroupButton(sender: AnyObject) {
// Your Code
} else {
groupList.append(addGroup.text)
self.tableView.reloadData()
}
//Your Code
}
并更新此功能:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{
let cell : UITableViewCell = tableView.dequeueReusableCellWithIdentifier("groupcell", forIndexPath: indexPath) as UITableViewCell
cell.textLabel.text = self.groupList[indexPath.row]
return cell
}
你可以检查我为您创建的最终代码这里 。
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
addGroup.delegate = self // You can do this in storyboard also
addGroup.placeholder = "Enter Group Name"
}
@IBAction func addGroupButton(sender: AnyObject) {
self.view.endEditing(true)
var error = ""
if addGroup.text == "" {
error = "Please enter a Group!"
} else {
groupList.append(addGroup.text)
//reload the table after adding text to array
self.tableView.reloadData();
}
if error != "" {
var alert = UIAlertController(title:"Error In Form", message: error, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title:"OK", style: .Default, handler: { action in
self.dismissViewControllerAnimated(true, completion:nil)
}))
self.presentViewController(alert, animated:true, completion:nil)
}
addGroup.text = ""
}
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