Here's high level description of what I'm trying to achieve; 1. fetch data 2. save the fetched data in an array object 3. update collection view with the size of the array
Here's my code
class ItemcollectionViewController:UICollectionViewController, UICollectionViewDelegateFlowLayout {
let cellId = "CellId"
var categories = [Category]()
let viewOptionVar:ViewOptionBar = {
let vOV = ViewOptionBar()
vOV.translatesAutoresizingMaskIntoConstraints = false
return vOV
}()
private func fetchData() {
let categoryController = CategoryController()
categoryController.getAllCategory(username: "blah", password: "password") {(returnedCategories, error) -> Void in
if error != nil {
print(error)
return
}
self.categories = returnedCategories!
print("size of the array is \(self.categories.count)")
OperationQueue.main.addOperation{self.collectionView?.reloadData()}
}
}
override func viewDidLoad() {
super.viewDidLoad()
fetchData()
collectionView?.backgroundColor = UIColor.white
collectionView?.register(ItemCell.self, forCellWithReuseIdentifier: cellId)
collectionView?.contentInset = UIEdgeInsetsMake(50, 0, self.view.frame.height, self.view.frame.width)
collectionView?.scrollIndicatorInsets = UIEdgeInsetsMake(50, 0, 0, self.view.frame.width)
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print("in the method \(self.categories.count)")
return self.categories.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! ItemCell
cell.category = categories[indexPath.item]
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 111, height: 111)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
private func setupViweOptionBar() {
view.addSubview(viewOptionVar)
view.addConstraintsWithFormat(format: "H:|[v0]|", views: viewOptionVar)
view.addConstraintsWithFormat(format: "V:|[v0(50)]", views: viewOptionVar)
}
}
In the log I could see the following statements:
in the method 0
size of the array is 3
and could not see any cell from my view.
Can someone advise me what I've done wrong? Thanks in advance.
EDIT 1 Now I'm fetching data after registering the customised cells. However, it still doesn't work
updated code:
class ItemcollectionViewController:UICollectionViewController, UICollectionViewDelegateFlowLayout {
let cellId = "CellId"
var categories = [Category]()
let viewOptionVar:ViewOptionBar = {
let vOV = ViewOptionBar()
vOV.translatesAutoresizingMaskIntoConstraints = false
return vOV
}()
private func fetchData() {
let categoryController = CategoryController()
categoryController.getAllCategory(username: "blah", password: "password") {(returnedCategories, error) -> Void in
if error != nil {
print(error)
return
}
self.categories = returnedCategories!
print("size of the array is \(self.categories.count)")
}
}
override func viewDidLoad() {
super.viewDidLoad()
collectionView?.backgroundColor = UIColor.white
collectionView?.register(ItemCell.self, forCellWithReuseIdentifier: cellId)
collectionView?.contentInset = UIEdgeInsetsMake(50, 0, self.view.frame.height, self.view.frame.width)
collectionView?.scrollIndicatorInsets = UIEdgeInsetsMake(50, 0, 0, self.view.frame.width)
collectionView?.dataSource = self
collectionView?.delegate = self
fetchData()
DispatchQueue.main.async{self.collectionView?.reloadData()}
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print("in the method \(self.categories.count)")
return self.categories.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! ItemCell
cell.category = categories[indexPath.item]
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 111, height: 111)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
private func setupViweOptionBar() {
view.addSubview(viewOptionVar)
view.addConstraintsWithFormat(format: "H:|[v0]|", views: viewOptionVar)
view.addConstraintsWithFormat(format: "V:|[v0(50)]", views: viewOptionVar)
}
}
EDIT 2
The following code is my querying method
func getAllCategory(username:String, password:String, callback: @escaping ([Category]?, String?) -> Void){
var categories = [Category]()
let fetchCategories = URL(string: userURL + "all")
URLSession.shared.dataTask(with: fetchCategories!, completionHandler: { (data, response, error) in
if let err = error {
print(err)
return
}
do {
let jsonCategoryObj = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [[String: AnyObject]]
for categoryDictionary in jsonCategoryObj {
let category = Category()
category.categoryId = categoryDictionary["categoryId"] as? String
category.categoryName = categoryDictionary["categoryName"] as? String
category.categoryDescription = categoryDictionary["categoryDescription"] as? String
let categoryRegisteredDateString = categoryDictionary["categoryRegisteredDate"] as? String
let df = DateFormatter()
df.dateFormat = self.shapeDateFormat
let categoryRegisteredDate = df.date(from: categoryRegisteredDateString!)!
category.categoryRegisteredDate = categoryRegisteredDate
categories.append(category)
}
callback(categories, nil)
}catch let jsonError {
callback(nil, String(describing: jsonError))
}
}).resume()
}
FYI: I know I'm not using passed user credential, it's just a copy and paste error from my different query method
