CODEWITHSUNDEEP
iosswiftuiscrollviewuitextview
Agung
Agung

Reputation: 13803

how to set enabled or disabled scrolling in scroll view based on the text view content size?

enter image description here

I am trying to make a view controller that has a scroll view and text view. I want my scrolling is enabled only when the text content of the text view is a lot. because it seems ugly if I can scroll my view controller even though the text content in the text view is not to much like the picture below

enter image description here

as we can see there is a big gap to the bottom of view controller. this is the code I use for this VC

import UIKit

class NotificationDetailVC: UIViewController {

    @IBOutlet weak var notificationTitleLabel: UILabel!
    @IBOutlet weak var notificationImage: UIImageView!
    @IBOutlet weak var notificationDateLabel: UILabel!
    @IBOutlet weak var notificationContentTextView: UITextView!

    var dataNotification : [String:Any]?

    override func viewDidLoad() {
        super.viewDidLoad()
        updateUI()
        updateReadStatusInUserDefault()
    }

    @IBAction func imageDidTapped(_ sender: Any) {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let popup = storyboard.instantiateViewController(withIdentifier: "imageDisplay") as! ReusableImageDisplayVC
        popup.photo = notificationImage.image
        self.present(popup, animated: true, completion: nil)
    }

    func updateUI() {
        guard let dataNotification = dataNotification else {return}
        notificationTitleLabel.text = dataNotification["Judul"] as? String
        notificationContentTextView.text = dataNotification["Keterangan"] as? String

        guard let notifDate = dataNotification["TglNotif"] as? String else {return}
        notificationDateLabel.text = DateTimeService.changeFormat(of: notifDate, toFormat: "d MMM YYY")

        let imagePath = dataNotification["Photo"] as? String
        guard let encodedImagePath = imagePath?.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed) else {return}

        if imagePath != nil {
            if imagePath!.isEmpty {
                notificationImage.removeFromSuperview()
            } else {
                notificationImage.sd_setImage(with: URL(string: encodedImagePath), placeholderImage: UIImage(named: "3-2 Img"), options: [.continueInBackground, .progressiveDownload])
            }
        } else {
            notificationImage.removeFromSuperview()
        }
    }

    func updateReadStatusInUserDefault() {
        guard let dataNotification = dataNotification,
            let notifID = dataNotification["notif_id"] as? Int else {return}

        guard var readNotificationStatusUserDefault  = UserDefaults.standard.object(forKey: "readNotification") as? [String:String] else {return}

        readNotificationStatusUserDefault["\(notifID)"] = "1"
        UserDefaults.standard.set(readNotificationStatusUserDefault, forKey: "readNotification")
        UserDefaults.standard.synchronize()
    }
}

Upvotes: 0

Views: 689

Answers (2)

Meenor Ranpura
Meenor Ranpura

Reputation: 127

First you need to find size of text of your textview, you can find size of text using :

func rectForText(text: String, font: UIFont, maxSize: CGSize) -> CGSize
{
    let attrString = NSAttributedString.init(string: yourtext, attributes: [NSAttributedStringKey.font:font])
    let rect = attrString.boundingRect(with: maxSize, options: NSStringDrawingOptions.usesLineFragmentOrigin, context: nil)
    let size = CGSize(width: rect.size.width, height: rect.size.height)//(, )
    return size
}

after that set size of your textview according to your text size : 

let contentSize : CGSize = rectForText(text: str, font:UIFont.boldSystemFont(ofSize: 15.0) , maxSize : CGSize(width: 200 * (SCREEN_WIDTH / 320), height: 20000) )

and set frame of your textview

var frame = self.myTextView.frame
frame.size.height = contentSize.height
self.myTextView.frame = frame

after set set contentsize of your scrollview

scrollView.contentSize = CGSize(width: self.view.frame.size.width, height: myTextView.frame.size.height + 8)

Hope this help! Happy coding :)

Upvotes: 3

pkc
pkc

Reputation: 8504

Depending upon the contentSize of text view, adjust the scrollable property of scroll view.

After setting the text on textview, check as below:-

    let height = self.notificationContentTextView.contentSize.height
if(height > scrollView.frame.size.height){
scrollView.isScrollEnabled == true
}else{
scrollView.isScrollEnabled == false
}

Upvotes: -2

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