swift couldn't add button dynamically to a scroll view

Question

this is my code

class ViewController: UIViewController {

@IBOutlet weak var d: UIScrollView!
let numberOfButtons = 50

override func viewDidLoad() {

    super.viewDidLoad()
    for index in 0..<self.numberOfButtons {
        let frame1 = CGRect(x: 20 + index, y: 20 + index, width: 45, height: 45 )
        let button = UIButton()
        button.frame = frame1
        button.titleLabel?.text = "asdfasdf"
        self.d.addSubview(button)
    }
}

pretty simple, when i run the simulation, i can't see any button in my scroll view.

i am doing this because i need just to have a scroll view that has more items than the simulate can have, just to check the scroll thing

You should use the setTitle method, so: button.setTitle("asdfasdf", forState: .Normal), but honestly the way you're doing it works, it probably won't solve your problem to change it. — The Beanstalk
– The Beanstalk, Commented Sep 8, 2015 at 23:21
@TheBeanstalk okay i did that but still nothing appear on my view — Marco Dinatsoli
– Marco Dinatsoli, Commented Sep 8, 2015 at 23:21

The Beanstalk · Accepted Answer · 2015-09-08 23:42:42Z

8

You just need to set the background color (or the text color), right now they're both white, so it looks like they aren't being drawn. Your code would look like this:

@IBOutlet weak var d: UIScrollView!
let numberOfButtons = 50

override func viewDidLoad() {

    super.viewDidLoad()
    for index in 0..<self.numberOfButtons {
        let frame1 = CGRect(x: 20, y: 20 + (index * 45), width: 45, height: 45 )
        let button = UIButton(frame: frame1)
        button.setTitle("asdfasdf", forState: .Normal)
        button.backgroundColor = UIColor.blackColor()
        self.d.addSubview(button)
    }

}

I've also changed the frames a bit so they'll draw in a straight line down the scroll view. Also, your view will not scroll unless you set the contentSize correctly, so you'll need to throw in a line immediately after the for-loop like this: self.d.contentSize.height = CGFloat(45*numButtons)

edited Sep 8, 2015 at 23:42

answered Sep 8, 2015 at 23:34

The Beanstalk

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2 Comments

Devster101 Over a year ago

Yes, this is right. Lol. Plus, your buttons will all be on top of each other. But each to their own, well not on top of each other but 1 pixel apart

Marco Dinatsoli Over a year ago

okay it worked, but the scroll view didn't scroll. why please? it is already enabled scrolled vertically and horizontally

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