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iOS

Posted by Gary Adams
Gary Adams
Courses Plus Student 1,176 Points

iOS Arrays - What if...

What if you wanted to show the 'fun facts' in order?

The tutorial displays random fun facts and I can't figure out how to display them sequentially.

@IBAction func showFunFact() { funFactLabel.text = factBook.factsArray[9] }

6 Answers

Andres Oliva
Andres Oliva
7,810 Points
Andres Oliva
Andres Oliva
7,810 Points

Try something like this:

var index = 0

@IBAction func showFunFact() {
 funFactLabel.text = factBook.factsArray[index]
index++
if (index > factBook.factsArray.count - 1) index = 0
 }

You could increment the index like this too:

 funFactLabel.text = factBook.factsArray[index++]

But then you'd begin displaying the second fact in your array.

Andres Oliva
Andres Oliva
7,810 Points
Andres Oliva
Andres Oliva
7,810 Points

Hey, I just realized that you can increment the index the other way as well and it would be the same, as the variable gets incremented after it is used :)

Andres Oliva
Andres Oliva
7,810 Points
Andres Oliva
Andres Oliva
7,810 Points

You can simply declare an index property and increment it by one every time you retrieve a fact. Just remember to reset the value to 0 everytime you reach the end of the array of facts.

Gary Adams
PLUS
Gary Adams
Courses Plus Student 1,176 Points
Gary Adams
Gary Adams
Courses Plus Student 1,176 Points

Thanks for your response! Does this look right?

@IBAction func showFunFact() { funFactLabel.text = factBook.factsArray[0++] }

Andres Oliva
Andres Oliva
7,810 Points
Andres Oliva
Andres Oliva
7,810 Points

Nope, that won't work.

Try using a variable instead of putting a zero there.

Gary Adams
PLUS
Gary Adams
Courses Plus Student 1,176 Points
Gary Adams
Gary Adams
Courses Plus Student 1,176 Points

Well... I'm not getting far.

var count = thisArray.count

thisArray[0...count]
Gary Adams
PLUS
Gary Adams
Courses Plus Student 1,176 Points
Gary Adams
Gary Adams
Courses Plus Student 1,176 Points

You're awesome. Thanks for helping me understand that array property!

... xcode expected curly brackets after the "if"

 @IBAction func showFunFact() {
        funFactLabel.text = factBook.factsArray[index]
        index++
        if (index > factBook.factsArray.count - 1) {index = 0}
    }
Andres Oliva
Andres Oliva
7,810 Points
Andres Oliva
Andres Oliva
7,810 Points

That's weird. But glad I could help!

Goran Jakovljevic
Goran Jakovljevic
920 Points
Goran Jakovljevic
Goran Jakovljevic
920 Points

Here is my code:

    var i = 0
    @IBAction func ButtonPressed() {
        funFactLabel.text = factBook.factsArray[i]
        i++
        if i == (factBook.factsArray.count) {
            i = 0
        }
    }