Adding data to arrays in swift - arrays

Question

I am trying to append data to an Array and save using TMCache, but it's like I'm doing it wrong. Cause, the data isn't being appended. I keep getting empty array
private var teams: Array<Teams> = Array<Teams>()
private var teamResults: [TeamResult]! {
didSet {
if teamResults.count <= 0 {
return
} else {
self.teams = []
for var index = 0; index < teamResults.count; index++ {
//print(index)
let categoryResult = teamResults[index]
if let categoryBackgroundImage = categoryResult["image"] as? PFFile {
categoryBackgroundImage.getDataInBackgroundWithBlock({ (data, error) -> Void in
if let dataGot = data {
let image = UIImage(data: dataGot)
let appendData = Teams(playing: categoryResult["playing"] as! Bool,
name: categoryResult["name"] as! String,
position: categoryResult["position"] as! Int,
image: image!)
//print(appendData.position)
self.teams.append(appendData)
}
print(self.teams.count) <-- I get 0
})
print(self.teams.count) <-- I get 0
}
}
TMCache.sharedCache().setObject(self.teams, forKey: "Teams")
self.mainTableView.reloadData()
for categ in teams {
print(categ.position)
}
}
}
}

Answer 1

getDataInBackgroundWithBlock works asynchronously. The data is returned later in the block.
You have to put the code to reload the table view into the block and check if the loop is finished.
For example (untested)
private var teams: Array<Teams> = Array<Teams>()
private var teamResults: [TeamResult]! {
didSet {
if teamResults.count <= 0 {
return
} else {
self.teams = []
var index : Int
for index = 0; index < teamResults.count; index++ {
//print(index)
let categoryResult = teamResults[index]
if let categoryBackgroundImage = categoryResult["image"] as? PFFile {
categoryBackgroundImage.getDataInBackgroundWithBlock({ (data, error) -> Void in
if let dataGot = data {
let image = UIImage(data: dataGot)
let appendData = Teams(playing: categoryResult["playing"] as! Bool,
name: categoryResult["name"] as! String,
position: categoryResult["position"] as! Int,
image: image!)
//print(appendData.position)
self.teams.append(appendData)
TMCache.sharedCache().setObject(self.category, forKey: "Teams")
if index == teamResults.count {
self.mainTableView.reloadData()
for categ in teams {
print(categ.position)
}
}
}
})
}
}
}
}
}