Display Array in a Label in Swift

How to Print Array in Label?

I assumed your lapTime is like below,

 let lapTime: [[Double]] = [[33.34,22.876,34.0]]

Method 1:

let arr = lapTime[0].map { (double) -> String in
    return String(double)
}.joined()

self.label.text = arr

or

let arr = lapTime[0].map { (double) -> String in
            return String(double)
            }.joined(separator: ", ")

self.label.text = arr

Method 2:

for time in lapTime[0]{
    let arr  = (self.label.text ?? "")+" "+String(time) //+"<space>"+ to +","+ if you need lap times are comma separated. 
    self.label.text = arr
}

Note:

The lapTime == [[33.34,22.876,34.0],[33.34,22.876,34.0]]and you had a UITableView, then replace lapTime[0] to lapTime[indexPath.row].

let me know is that you need.

Output:

How to display array in label?

Conform MyCurrency to CustomStringConvertible and override its description property to return the required String instance,

struct MyCurrency: CustomStringConvertible {

    var currency: String
    var currentPrice: String

    var description: String {
        return "\(currency) to \(currentPrice)"
    }
}

Now, to get a String of currencies, use map(_:) and joined() on the array of MyCurrency, i.e.

let btc = MyCurrency(currency: "BTC", currentPrice: "10223.4337")
let gbp = MyCurrency(currency: "GBP", currentPrice: "1,2221")
let rub = MyCurrency(currency: "RUB", currentPrice: "0.015169")
let eur = MyCurrency(currency: "EUR", currentPrice: "1.11")
let uah = MyCurrency(currency: "UAH", currentPrice: "0.039841")

let str = [btc, gbp, rub, eur, uah].map({ String(describing: $0) }).joined()
print(str) //BTC to 10223.4337GBP to 1,2221RUB to 0.015169EUR to 1.11UAH to 0.039841
label.text = str

Update:

You can use reduce(_:_:) as well to get the required output, i.e.

let str = [btc, gbp, rub, eur, uah].reduce("") { (result, currency) -> String in
    return result + String(describing: currency)
}
print(str) //BTC to 10223.4337GBP to 1,2221RUB to 0.015169EUR to 1.11UAH to 0.039841

How to display an array in a label

You can use Swift's join method, as described in this question.

So in your case, it'd be:

self.aar.join("")

which would be the aar array joined on the empty string, meaning all elements concatenated (as long as they are strings themselves, which it seems they are).

How can i show an array in label ? With ,

An array of strings can be joined by , using:

arr.joined(separator: ",")

Refer: https://developer.apple.com/documentation/swift/array/joined(separator:)-5do1g

How can I write the items to UILabel from the array?

you can use joined() function:

myLabel.text = "\(array.joined())\n"

How to make an array the label text?

First, and easiest, idea that comes to mind, is just make 3 labels and constrain them as you wish. Secondly, you could create a UITextView, instead.

let tView = UITextView(frame: CGRect(x: 0, y: 0, width: widthOfLongestWord, height: whatever height fits 3 lines))
tView.text = ""
for str in array {
    tView.text += str + "\n"
}

I assume this is being used in a view controller, in which case you should set the frame to zero and just constrain the textView with autoLayout.

Display two array data in label swift

Simply use zip(_:_:), map(_:) and joined(separator:) on the arr1 and arr2 to get the expected result, i.e.

let arr1 = ["A","B","C"]
let arr2 = ["D","E","F"]

let text = zip(arr1, arr2).map{ "\($0.0):\($0.1)" }.joined(separator: ",") //A:D,B:E,C:F
label.text = text

how to display an array on a label

try with this.

you test() function has NSArray return type

func test()-> NSArray{
 //bla bla bla
 let myArray:NSArray = ["data1","data2","data3"]

 print(myArray)
 return myArray;
}

then you can get your result

label.text = test().componentsJoinedByString(",")

Displaying Array in Text Label

Use this:

NSArray *listOfWords = @[@"One", @"Two", @"Three"];
NSString * stringToDisplay = [listOfWords componentsJoinedByString:@"\n"];
wordList.text = stringToDisplay;

Will Display:

One
Two
Three

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