I have a problem showing a tabbarVC.
Here is the codes:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
let tabBarVC = UITabBarController()
guard let vc1 = storyboard?.instantiateViewController(identifier: "FirstController") as? FirstController else {
print("failed to get vc1 from Storyboard")
return
}
guard let vc2 = storyboard?.instantiateViewController(identifier: "SecondController") as? SecondController else {
print("failed to get vc2 from Storyboard")
return
}
guard let vc3 = storyboard?.instantiateViewController(identifier: "ThirdController") as? ThirdController else {
print("failed to get vc3 from Storyboard")
return
}
let vc4 = UINavigationController(rootViewController: vc1)
let vc5 = UINavigationController(rootViewController: vc2)
let vc6 = UINavigationController(rootViewController: vc3)
vc4.title = "XXX"
vc5.title = "YYY"
vc6.title = "ZZZ"
tabBarVC.setViewControllers([vc4,vc5,vc6], animated: false)
tabBarVC.modalPresentationStyle = .fullScreen
self.present(tabBarVC, animated: true)
}
}
The tabbar has shown correctly, but I got a warning of "Unbalanced calls to begin/end appearance transitions for <tabbarcontroltest.ViewController:" which I don't understand.
Also I have tried to change
tabBarVC.modalPresentationStyle = .fullScreen
to
tabBarVC.modalPresentationStyle = .overFullScreen
And, then I don't have this warning, but instead, when I try to close the app by home button,
I got another warning as
tabbarcontroltest[Presentation] Attempt to present on <tabbarcontroltest.ViewController> (from <tabbarcontroltest.ViewController) which is already presenting .
I guess there is something wrong with the presentation style? Or is there something else wrong?
Thanks
found the solution by myself. the correct way is as follows:
tabBarVC.modalPresentationStyle = .fullScreen
tabBarVC.view.frame = self.view.bounds
addChild(tabBarVC)
view.addSubview(tabBarVC.view)
tabBarVC.willMove(toParent: self)
Related
I have used the below implementation to play a video with cookies content from the server, but it shows play icon with cross line. I have refer the link and do following implementation in swift. but I didn't get any output :(
func showVideo(url: String) {
let videoURL = NSURL(string: url)
var cookiesArray = [HTTPCookie]()
guard let cookieArray = UserDefaults.standard.array(forKey:
Constants.Object.kCookie) as? [[HTTPCookiePropertyKey: Any]] else {
return }
for cookieProperties in cookieArray {
if let cookie = HTTPCookie(properties: cookieProperties) {
cookiesArray.append(cookie)
}
}
let cookieArrayOptions = [AVURLAssetHTTPCookiesKey: cookiesArray]
let assets = AVURLAsset(url: videoURL! as URL, options: cookieArrayOptions)
let item = AVPlayerItem(asset: assets)
videoPlayer = AVPlayer(playerItem: item)
self.playerController.player = self.videoPlayer
self.playerController.view.frame = self.view.frame
self.present(self.playerController, animated: true, completion: nil)
self.playerController.player?.play()
}
Please help me on that, what is wrong in that implementation.
Thanks in advance! :)
After going through so many ways finally I have got the solution which worked for me :
func showVideo(url: String) {
let videoURL = NSURL(string: url)
let cookiesArray = HTTPCookieStorage.shared.cookies! //Stored Cookies of your request
let values = HTTPCookie.requestHeaderFields(with: cookiesArray)// Returns a dictionary of header fields corresponding to a provided array of cookies.ex.["Cookie":"your cookies values"]
let cookieArrayOptions = ["AVURLAssetHTTPHeaderFieldsKey": values]
let assets = AVURLAsset(url: videoURL! as URL, options: cookieArrayOptions)
let item = AVPlayerItem(asset: assets)
videoPlayer = AVPlayer(playerItem: item)
self.playerController.player = self.videoPlayer
self.playerController.view.frame = self.view.frame
self.present(self.playerController, animated: true, completion: nil)
self.playerController.player?.play()
}
In FirstViewController i'm fetching the response from JSON and want to pass that fetched response to another view controller.Below is the code which i have used so far for parsing and passing the response.
FirstViewController
var fn:String! //globally declared variable
code i have tried for parsing in FirstViewController
do {
let detailsDictionary:NSDictionary = try JSONSerialization.jsonObject(with: data!, options:.allowFragments) as! Dictionary<String, AnyObject> as NSDictionary
print(detailsDictionary)
let details = detailsDictionary["Data"] as! [[String:AnyObject]]
print(details)
for dtl in details
{
self.fn = dtl["Father_Name"] as? String ?? "NA"
print(self.fn) //here i'm getting the exact value from JSON
}
}
}
SecondViewController
In SecondViewController there is a Label called profile_name and want to set that parsed string(fn) as Label's text. for that i declared another variable as global.
var pname:String!
below is the code i have used to fetch the value from FirstViewController.
viewDidLoad()
{
let othervc = FirstViewController()
self.pname = othervc.fn
self.profile_name.text = self.pname
}
Problem : I tried my best efforts to get the desired output but i'm getting nil response.
Please Help.
In Second ViewController
let strName:String!
In First ViewController
let strOne = "This is for testing"
let objstory = self.storyboard?.instantiateViewController(withIdentifier: "yout Secoond ViewController Storybord ID") as! YourSecondViewControllerName
objstory.strNam = strOne
self.navigationController?.pushViewController(objstory, animated: true)
Your updated code just won't work.
let othervc = FirstViewController()
creates a new instance of FirstViewController (not the one that got the JSON).
You should be handling it something like this:
In FirstViewController
let fn = dtl["Father_Name"] as? String ?? "NA"
let svc = SecondViewController() // Or maybe instantiate from Storyboard, or maybe you already have a reference to it
svc.pname = fn
present(svc, animated: true, completion: nil)
Then in SecondViewController
override func viewDidLoad() {
super.viewDidLoad()
profile_name.text = pname
}
I'd suggest you take some time out and re-read Apple's View Controller programming guide.
Original Answer
The problem you have here…
vcvalue.profile_name.text = fn
is that profile_name is nil as the view for the view controller hasn't been loaded at this point.
You should handle this by creating a property in LeftSideMenuViewController
var name: String?
Then set
vcvalue.name = fn
And then in LeftSideMenuViewController
override func viewDidLoad() {
super.viewDidLoad()
profile_name.text = name
}
Also, some basic tips…
Don't force unwrap (!) apart from IBOutlets. You may have to write a bit more code, but you will reduce crashes.
Make #IBOutlets private - this will prevent you accidentally assigning to them as you are now
If you're overriding any viewWill/DidDis/Appear methods, you must call super at some point.
You need to re-read the section on switch/case
So this…
let a = indexPath.row
switch(a)
{
case 0 :
if(a == 0)
{
return 45
}
break
etc
could just be…
switch indexPath.row {
case 0...4:
return 45
case 5:
return 50
default:
break
}
I want to add a new To Do item when i press the add button,but i don't want to switch to another page.
press the add button to add a new row in the table view,input something and press the done button,it will save.
somebody suggests me to save the cells data to Model,but i don't know how to write this.
Who can help me?
import UIKit
import CoreData
class ToDoViewController: UIViewController {
var items: [NSManagedObject] = []
#IBOutlet weak var tableView: UITableView!
#IBAction func addItem(_ sender: UIBarButtonItem) {
//***How to write this code***
}
#IBAction func done(_ sender: UIBarButtonItem) {
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
return
}
let managedContext = appDelegate.persistentContainer.viewContext
let entity = NSEntityDescription.entity(forEntityName: "ToDo", in: managedContext)!
let item = NSManagedObject(entity: entity, insertInto: managedContext)
//***let list = the current textView's text
//how to get the textView's text and assign it to a value.***
item.setValue(list, forKeyPath: "summary")
do {
try managedContext.save()
items.append(item)
} catch let error as NSError {
print("Could not save.\(error),\(error.userInfo)")
}
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(UITableViewCell.self,forCellReuseIdentifier: "Cell")
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
return
}
let managedContext = appDelegate.persistentContainer.viewContext
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "ToDo")
do {
items = try managedContext.fetch(fetchRequest)
} catch let error as NSError {
print("Could not fetch.\(error),\(error.userInfo)")
}
}
}
extension ToDoViewController: UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return items.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let item = items[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let textView = UITextView(frame: CGRect(x: 0, y: 0, width: cell.frame.size.width, height: cell.frame.size.height))
cell.addSubview(textView)
textView.text = item.value(forKey: "summary") as? String
return cell
}
}
Ok so If my understanding is right you need a new row to be added if they create a new entry into your Core Data. So in your viewWillAppear you're doing a fetch. What I think you need is a:
var fetchResultController : NSFetchedResultsController<YourType>!
Then using this fetch controller you want to do the following when fetching:
private func GetToDoEntries(){
if let appDele = UIApplication.shared.deletgate as? AppDelegate{
let givenContext = appDele.persistantContainer.viewContex
let entryFetchRequest : NSFetchRequest<YourType> = YourType.fetchRequest()
let sortDescriptors = NSSortDescriptor(key: "yourEntrySortKey" , ascending: true)
entryFetchRequest.sortDescriptors = [sortDescriptors]
fetchResultController = NSFetchedResultsController(fetchRequest: entryFetchRequest, managedObjectContext: givenContext, sectionNameKeyPath: nil, cacheName: nil)
fetchResultController.delegate = self
do{
//Gets fetched data based on our criteria
try fetchResultController.performFetch()
if let fetchedEntries = fetchResultController.fetchedObjects{
items = fetchedEntries as? WhateverToCastTo
}
}catch{
print("Error when trying to find entries")
}
}
}
First I'm sorry but I've just written this here is stackOverflow. So what you're doing is using a fetch result controller instead of a traditional search. You are required to have the sort descriptor as well and you can try to get the results and cast them to your items or as a NSManagedObject.
Now we're not done though. Your script needs to inherit from some behaviour. At the top of your class
class ToDoViewController : UIViewController, NSFetchedResultsControllerDelegate
You need the delegate as you can see in the first block of code because we're assigning it. Now we're almost there. You just need some methods to update the table for you and these come with the delegate we just inherited from.
//Allows the fetch controller to update
func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
tableView.beginUpdates()
}
//Allows new additions to be added to the table
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
switch type{
case .insert:
if let _newIndexPath = newIndexPath{
tableView.insertRows(at: [_newIndexPath], with: .fade)
}
case .update:
if let index = indexPath{
tableView.reloadRows(at: [index], with: .fade)
}
default:
budgetEntryTable.reloadData()
}
if let fetchedObjects = controller.fetchedObjects{
items = fetchedObjects as! [NSManagedObject (Or your cast type)]
budgetEntryTable.reloadData()
}
}
//Ends the table adding
func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
tableView.endUpdates()
}
So there are 3 methods here. The first and second are very self explanatory. They begin and end the updates on your tableView. I'd also recommend that you change the name of your tableView to something other than "tableView" just for clarity.
The method in the middle uses a switch. My example is missing the "Move" and "Delete" options as I didn't required them in my project but you can add them to the switch statement.
The insert is checking the newIndexPath to see if there is one. If so then we add an array of the amount of rows required at the newIndexPath.
The update just checks the current index paths and then reloads the data on them incase you updated your data model.
I hope this is what you were looking for. Good luck! I'll try and help more if you need it but that should get you started.
Having problem in displaying polyline on the mapview
Following this tutorial
MapView Tutorial
Attached is my code.
Annotation is appearing on the map but unable to call the renderer method. Though the delegate is there.
Main Problem: Unable to draw line between two coordinates
Console Output: 2017-02-06 22:54:56.770584 MapTest[2329:805733] [LogMessageLogging] 6.1 Unable to retrieve CarrierName. CTError: domain-2, code-5, errStr:((os/kern) failure)
Here is the code
import UIKit
import MapKit
class ViewController: UIViewController,MKMapViewDelegate {
#IBOutlet weak var myMap: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
// 1.
myMap.delegate = self
// 2.
let sourceLocation = CLLocationCoordinate2D(latitude: 40.759011, longitude: -73.984472)
let destinationLocation = CLLocationCoordinate2D(latitude: 40.748441, longitude: -73.985564)
// 3.
let sourcePlacemark = MKPlacemark(coordinate: sourceLocation, addressDictionary: nil)
let destinationPlacemark = MKPlacemark(coordinate: destinationLocation, addressDictionary: nil)
// 4.
let sourceMapItem = MKMapItem(placemark: sourcePlacemark)
let destinationMapItem = MKMapItem(placemark: destinationPlacemark)
// 5.
let sourceAnnotation = MKPointAnnotation()
sourceAnnotation.title = "Times Square"
if let location = sourcePlacemark.location {
sourceAnnotation.coordinate = location.coordinate
}
let destinationAnnotation = MKPointAnnotation()
destinationAnnotation.title = "Empire State Building"
if let location = destinationPlacemark.location {
destinationAnnotation.coordinate = location.coordinate
}
// 6.
self.myMap.showAnnotations([sourceAnnotation,destinationAnnotation], animated: true )
// 7.
let directionRequest = MKDirectionsRequest()
directionRequest.source = sourceMapItem
directionRequest.destination = destinationMapItem
directionRequest.transportType = .automobile
// Calculate the direction
let directions = MKDirections(request: directionRequest)
// 8.
directions.calculate {
(response, error) -> Void in
guard let response = response else {
if let error = error {
print("Error: \(error)")
}
return
}
let route = response.routes[0]
self.myMap.add((route.polyline), level: MKOverlayLevel.aboveRoads)
let rect = route.polyline.boundingMapRect
self.myMap.setRegion(MKCoordinateRegionForMapRect(rect), animated: true)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer {
print("Line 85 is being called......start...")
let renderer = MKPolylineRenderer(overlay: overlay)
renderer.strokeColor = UIColor.red
renderer.lineWidth = 4.0
print("Line 85 is being called.......end..")
return renderer
}
}
Your rendererForOverlay function has the wrong syntax; Xcode told me this when testing your code. Use
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer
Instead, and a line will be drawn between the two points.
I have a UISearchController inside of a UINavigationBar. The user has to tap on a UIBarButtonItem, in which I instantiate a new UIViewController then present it, in order to begin searching.
class ViewController: UIViewController {
var searchController: UISearchController!
override func viewDidLoad() {
super.viewDidLoad()
setupSearchController()
}
func setupSearchController() {
searchController = UISearchController(searchResultsController: nil)
searchController.searchBar.delegate = self
searchController.searchResultsUpdater = self
searchController.searchBar.showsCancelButton = true
searchController.dimsBackgroundDuringPresentation = false
searchController.hidesNavigationBarDuringPresentation = false
definesPresentationContext = true
navigationItem.titleView = searchController.searchBar
}
}
I've done plenty of research before hand, but still can't manage to find a solution...
Help in making the search controller become the first responder would be very much appreciated.
Making the UISearchBar the first responder on the main thread was the solution.
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
DispatchQueue.main.async {
self.searchController.searchBar.becomeFirstResponder()
}
}