in my app i want to display two table view in an UIViewController but i've a fatal error : fatal error: unexpectedly found nil while unwrapping an Optional value
can someone help me about this?
here is the full code of the uiview
class MyPropertiesViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
//table view extended
#IBOutlet weak var extandedTableViex: UITableView!
// table view standart
#IBOutlet weak var standartTableView: UITableView!
//list of data
let stdlist = ["1","2","3", "4","5","6","7","8","9"]
let Extlist = ["E1","E2" ]
//cell indentifier
let stdcellIdentifier = "stdcell"
let extcellIdentifier = "extcell"
override func viewDidLoad() {
super.viewDidLoad()
standartTableView.delegate = self
standartTableView.dataSource = self
standartTableView.delegate = self
standartTableView.dataSource = self
standartTableView.scrollEnabled = false
extandedTableViex.scrollEnabled = false
self.standartTableView.registerClass(GuaranteeCell.self, forCellReuseIdentifier: stdcellIdentifier)
self.extandedTableViex.registerClass(GuaranteeCell.self, forCellReuseIdentifier: extcellIdentifier)
}
//count cell
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if tableView == standartTableView {
return self.stdlist.count;
} else {
return self.Extlist.count;
}
}
// add cell
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if tableView == standartTableView {
let cell:GuaranteeCell = self.standartTableView.dequeueReusableCellWithIdentifier(stdcellIdentifier) as! GuaranteeCell
print("list-element " + self.stdlist[indexPath.row])
print(indexPath.row)
cell.guaranteeLabel.text = self.stdlist[indexPath.row]
return cell
} else {
let cell2:GuaranteeCell = self.extandedTableViex.dequeueReusableCellWithIdentifier(extcellIdentifier) as! GuaranteeCell
cell2.guaranteeLabel.text = String(self.Extlist[indexPath.row])
return cell2
}
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { }
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
thanks
Check if your cell class is really GuaranteeCell (probably the error is there)
Related
I have a program written in Swift 3, that grabs JSON from a REST api and appends it to a table view.
Right now, I'm having troubles with getting it to print in my Tableview, but it does however understand my count function.
So, I guess my data is here, but it just doesn't return them correctly:
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, HomeModelProtocal {
#IBOutlet weak var listTableView: UITableView!
func itemsDownloaded(items: NSArray) {
feedItems = items
self.listTableView.reloadData()
}
var feedItems: NSArray = NSArray()
var selectedLocation : Parsexml = Parsexml()
override func viewDidLoad() {
super.viewDidLoad()
self.listTableView.delegate = self
self.listTableView.dataSource = self
let homeModel = HomeModel()
homeModel.delegate = self
homeModel.downloadItems()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cellIdentifier: String = "BasicCell"
let myCell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier)!
let item: Parsexml = feedItems[indexPath.row] as! Parsexml
myCell.textLabel!.text = item.title
return myCell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return feedItems.count
}
override func viewDidAppear(_ animated: Bool) {
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
Are you by any chance able to see the error that I can't see?
Note. I have not added any textlabel to the tablerow, but I guess that there shouldn't be added one, when its custom?
Try this code:
override func viewDidLoad() {
super.viewDidLoad()
print(yourArrayName.count) // in your case it should be like this print(feedItems.count)
}
I created a UITableView and fed it some data using code.
While running the application on Xcode simulator it works fine but when I deploy it on physical device, the UITableView is not visible.
Image - 1 (Simulator)
Image - 2 (Device)
Below is my Code:
import UIKit
class OTCMedicines: UIViewController, UITableViewDelegate, UITableViewDataSource{
#IBOutlet weak var tableView: UITableView!
struct Med {
var name:String
var detail:String
var imageName:String
var image: UIImage {
get {
return UIImage(named: imageName)!
}
}
}
var data:[Med]=[Med]()
override func viewDidLoad() {
super.viewDidLoad()
print("OTC Loaded")
data.append(Med(name:"Nimprex P",detail:"Fever and Painkiller",imageName:"db"))
data.append(Med(name:"Cozi Plus",detail:"Cold and Fever",imageName:"db"))
data.append(Med(name:"Combiflam",detail:"Headach and Painkiller",imageName:"db"))
data.append(Med(name:"Flexon",detail:"Muscle Painkiller",imageName:"db"))
data.append(Med(name:"Avil",detail:"Antibiotic",imageName:"db"))
data.append(Med(name:"Cetirizine",detail:"Antibiotic and Allergy",imageName:"db"))
data.append(Med(name:"LIV 52",detail:"Lever Problems",imageName:"db"))
data.append(Med(name:"Perinorm",detail:"Stomach-ach and Puke",imageName:"db"))
data.append(Med(name:"Edicone Plus",detail:"Fever and Cold",imageName:"db"))
data.append(Med(name:"L-Hist Mont",detail:"Peanut Allergies",imageName:"db"))
tableView.delegate = self
tableView.dataSource = self
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return data.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("MedicineCell") as! OTCMedCell!
let medView = data[indexPath.row]
print("OTC Table Cell Loaded")
cell.medName.text = medView.name
cell.medImage.image = medView.image
cell.medDetail.text = medView.detail
return cell
}
// MARK: UITableViewDelegate Methods
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "OTCMedPush" {
if let destination = segue.destinationViewController as? OTCMedicineDetail {
if let medIndex = tableView.indexPathForSelectedRow?.row {
destination.medicineValue = data[medIndex].name
}
}
}
}
}
Both simulator and iPhone are model 5s, running on iOS 9.2
I believe you need to reload the table after you added all the elements in viewDidLoad.
self.UITableView.reloadData()
Seems you must insert these lines in viewDidLoad:
self.tableView.registerNib(UINib(nibName: "OTCMedCell", bundle:nil), forCellReuseIdentifier: "MedicineCell")
self.tableView.reloadData()
Also, in your cellForRowAtIndexPath modify your line:
let cell = tableView.dequeueReusableCellWithIdentifier("MedicineCell") as! OTCMedCell!
with:
let cellIdentifier : String! = "MedicineCell"
var cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier) as? OTCMedCell!
if cell == nil {
cell = OTCMedCell(style: UITableViewCellStyle.Default, reuseIdentifier: (cellIdentifier))
}
I create uiSegmentedControl in HomePageViewController. There are two items in segmented control. When I select first item , I add sensorItemViewController content as a subview in HomePageViewController with displayContentController method. And when clicked second item, I want to access methods of SensorTabItemViewController class which it's name is reloadMyTableView from HomePageViewConroller. I accessed from sensorItemVC but I get "unexpectedly found nil while unwrapping an Optional value" exception. How can access SensorItemTabViewController from HomePageViewControler correctly ? Thank you all response
HomePageViewController.swift :
let segmentedControlItems = ["Table", "RefreshTableView"]
var viewControllerArray: Array<UIViewController> = []
var segmentedControl : UISegmentedControl!
var sensorItemVC: SensorTabItemViewController!
class HomePageViewController: UIViewController,UIScrollViewDelegate {
override func viewDidLoad() {
super.viewDidLoad()
segmentedControl=UISegmentedControl(items: segmentedControlItems)
segmentedControl.selectedSegmentIndex=0
segmentedControl.tintColor=myKeys.darkBlueColor
segmentedControl.layer.cornerRadius = 0.0;
segmentedControl.layer.borderWidth = 1.5
segmentedControl.frame=CGRectMake(0, frameHeight/2, frameWidth, 35)
segmentedControl.addTarget(self, action: "changeSegmentedControlItem", forControlEvents: .ValueChanged)
self.view.addSubview(segmentedControl)
let sensorItemViewController = self.storyboard!.instantiateViewControllerWithIdentifier("sensorTabItemViewController")
viewControllerArray.append(sensorItemViewController)
}
func changeSegmentedControlItem(){
print(segmentedControl.selectedSegmentIndex)
if(segmentedControl.selectedSegmentIndex==0){
displayContentController(viewControllerArray[0])
}
else{
sensorItemVC.reloadMyTableView("Temp value", light: "Light value", noise: "noise Value", motion: "motion Value")
}
}
func displayContentController (content:UIViewController) {
self.addChildViewController(content)
print(self.segmentedControl.frame.height)
content.view.frame=CGRectMake(0, self.frameHeight/2+self.segmentedControl.frame.height, self.frameWidth,
self.frameHeight-(segmentedControl.frame.height*2+self.frameHeight/2))
self.view.addSubview(content.view)
content.didMoveToParentViewController(self)
}
}
SensorTabItemViewController. swift as below :
class SensorTabItemViewController: UIViewController,UITableViewDataSource,UITableViewDelegate {
#IBOutlet weak var tableView: UITableView!
let sensorName=["Sıcaklık Sensörü","Işık Sensörü","Gürültü Sensörü","Hareket Sensörü"]
var sensorDetails=["","","",""]
var sensorImages: Array<UIImage> = []
override func viewDidLoad() {
super.viewDidLoad()
print("sensorTab")
let tempImg=UIImage(named: "temp_ic") as UIImage?
let lightImg=UIImage(named: "light_ic") as UIImage?
let noiseImg=UIImage(named: "noise_ic") as UIImage?
let motionImg=UIImage(named: "motion_ic") as UIImage?
sensorImages.append(tempImg!)
sensorImages.append(lightImg!)
sensorImages.append(noiseImg!)
sensorImages.append(motionImg!)
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func reloadTableView(){
sensorDetails=[]
sensorDetails.append(temp)
sensorDetails.append(light)
sensorDetails.append(noise)
sensorDetails.append(motion)
tableView.reloadData()
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sensorName.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("sensorCell", forIndexPath: indexPath) as UITableViewCell
cell.textLabel?.text=sensorName[indexPath.row]
cell.imageView?.image=sensorImages[indexPath.row]
cell.detailTextLabel?.text=sensorDetails[indexPath.row]
return cell
}
}
You never set the value of sensorItemVC. That is why it is nil. I guess that
let sensorItemViewController = self.storyboard!.instantiateViewControllerWithIdentifier("sensorTabItemViewController")
should be replaced with
sensorItemVC = self.storyboard!.instantiateViewControllerWithIdentifier("sensorTabItemViewController") as! SensorTabItemViewController
I'm trying to create an app that displays some data on labels on the top of a screen, and then the lower half or so is a table which will allow selection of an item in the table to pop up another segue for editing a value. I'm struggling though to get the didSelectRowAtIndexPath to be called when an item on the list is selected by the user. I've put the code for the View controller below.
I've searched quite a bit and haven't found anything so far that explains the issue I'm seeing.
I think I've connected everything up correctly as far as delegates and datasource, and I'm not using any gesture captures so it's not those. Does anyone have any ideas?
I've attached screen grabs of the view controller connections and attributes inspector settings as well.
Connections screengrab
Attributes screengrab
import UIKit
class TemperatureViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var CurrentTemp: UILabel!
#IBOutlet weak var HeaterStatus: UILabel!
#IBOutlet weak var ChillerStatus: UILabel!
#IBOutlet weak var TempTableView: UITableView!
var settings = [TemperatureSettings] ()
var HeaterTemp:Float = 0.0
var ChillerTemp:Float = 0.0
var ThresholdTemp:Float = 0.0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.loadTempSettings()
TempTableView.delegate = self
TempTableView.dataSource = self
TempTableView.allowsSelection = true
TempTableView.editing = false
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.loadTempSettings()
}
func loadTempSettings() {
let TempSetting1 = TemperatureSettings(name: "Heater On at", CurrentSetting: HeaterTemp)!
let TempSetting2 = TemperatureSettings(name: "Chiller On at", CurrentSetting: ChillerTemp)!
let TempSetting3 = TemperatureSettings(name: "Threshold", CurrentSetting: ThresholdTemp)!
settings = [TempSetting1, TempSetting2, TempSetting3]
TempTableView.reloadData()
//refreshControl?.endRefreshing()
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return settings.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
// Stop spoof separators after the table entries for blank entries
tableView.tableFooterView = UIView(frame: CGRect.zeroRect)
// Turn off the separator for each cell.
tableView.separatorStyle = UITableViewCellSeparatorStyle.None
let cellIdentifier = "TemperatureSettingsTableViewCell"
let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! TemperatureSettingsTableViewCell
let setting = settings[indexPath.row]
cell.SettingNameLabel.text = setting.name
cell.SettingCurrentLabel.text = String(format: "%.1f C", setting.CurrentSetting)
cell.SettingCurrentLabel.textAlignment = .Left
// Configure the cell...
//useTimer = true
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
print("Setting Row \(indexPath.row) clicked")
performSegueWithIdentifier("Settings", sender: self)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
This works for me:
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
print("works");
}
Add override before func maybe?
I'm using a UITableView in a ViewController connected to TodayViewController. I want to use data from my Parse database to load into the TableView.
Here is my TodayViewController class:
import UIKit
class TodayViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet var InfoTableView: UITableView?
override func viewDidLoad() {
super.viewDidLoad()
InfoTableView!.delegate = self
InfoTableView!.dataSource = self
loadParseData()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func loadParseData() {
let query : PFQuery = PFQuery(className: "News")
query.orderByDescending("Headline")
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath, object: PFObject?) -> PFTableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier("NewCell") as! PFTableViewCell!
if cell == nil {
cell = PFTableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "NewCell")
}
//Extract values from the PFObject to display in the table cell
if let Headline = object?["Headline"] as? String {
cell?.textLabel?.text = Headline
}
if let Subtitle = object?["SubtitleText"] as? String {
cell?.detailTextLabel?.text = Subtitle
}
return cell
}
This error crops up:
How do I solve the problem? Is there any mistake in the overall structure? Do request for more information if required.
Yes you are not confirm to protocol UITableViewDataSource because you don't have a required method
func tableView(_ tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
So you need to inherit PFQueryTableViewController to use the methods you want
class TodayViewController: PFQueryTableViewController {
...
}
I think you have implemented all the delegate methods of tableview outside the main class, i mean there will be a open parenthesis { and the close parenthesis should be end of all the methods. try like this
import UIKit
class TodayViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet var InfoTableView: UITableView?
override func viewDidLoad() {
super.viewDidLoad()
InfoTableView!.delegate = self
InfoTableView!.dataSource = self
loadParseData()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func loadParseData() {
let query : PFQuery = PFQuery(className: "News")
query.orderByDescending("Headline")
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath, object: PFObject?) -> PFTableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier("NewCell") as! PFTableViewCell!
if cell == nil {
cell = PFTableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "NewCell")
}
//Extract values from the PFObject to display in the table cell
if let Headline = object?["Headline"] as? String {
cell?.textLabel?.text = Headline
}
if let Subtitle = object?["SubtitleText"] as? String {
cell?.detailTextLabel?.text = Subtitle
}
return cell
}
}
Hope this will help.