从UITextView Swift 2获取文本

Question

I m doing an iOS project using swift 2, I have a UITableView with custom cells. I have one cell with a UITextView and a simple label, and I wan't to get the value of this UITextView when it's modified, but it's not like UITextFields, I can't use on edit begin method. How can I do that ?

Here is my code to define my custom cell :

let cell = tableView.dequeueReusableCellWithIdentifier(CurrentFormTableView.CellIdentifiers.ParagraphCell, forIndexPath: indexPath) as! ParagraphCell
                cell.display(block)
                cell.selectionStyle = UITableViewCellSelectionStyle.None
                tableView.rowHeight = UITableViewAutomaticDimension
                tableView.estimatedRowHeight = 160.0
                return cell

And here is my ParagraphCell.swift

import UIKit

protocol ParagraphCell {
    func update ParagraphCell(cell: ParagraphCell, rep: String)
}

class ParagraphCell: UITableViewCell {

    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var answerField: UITextView!


    var delegate: ParagraphCell Delegate?

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
        let borderColor : UIColor = UIColor(red: 0.85, green: 0.85, blue: 0.85, alpha: 1.0)
        answerField.layer.borderWidth = 0.5
        answerField.layer.borderColor = borderColor.CGColor
        answerField.layer.cornerRadius = 5.0

    }

    override func setSelected(selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

    func display(block: Block){
        titleLabel.text = block.title
        answerField.text = ""
    }

//THIS METHOD IS NEVER CALLED... 
    func textViewDidChange(textView: UITextView) { //Handle the text changes here
        print(textView.text); //the textView parameter is the textView where text was changed
        delegate?.update ParagraphCell(self, rep: textView.text)
    }


}

Answer 1

You need to add answerField.delegate = self in awakeFromNib to receive delegate callbacks.

override func awakeFromNib() {
    super.awakeFromNib()
    // Initialization code
    let borderColor : UIColor = UIColor(red: 0.85, green: 0.85, blue: 0.85, alpha: 1.0)
    answerField.layer.borderWidth = 0.5
    answerField.layer.borderColor = borderColor.CGColor
    answerField.layer.cornerRadius = 5.0
    answerField.delegate = self // create delegate reference
}

You'll also need to add UITextViewDelegate to your class protocol declaration:

class ParagraphCell: UITableViewCell, UITextViewDelegate { }

Answer 2

Yes, you need to set the delegate of the UITextView to the object where you want to put your textViewDidChange method. At the moment you have it in the ParagraphCell class, but it would probably make more sense to put this into your view controller instead, and make the view controller the delegate.

Answer 3

let cell = tableView.dequeueReusableCellWithIdentifier(CurrentFormTableView.CellIdentifiers.ParagraphCell, forIndexPath: indexPath) as! ParagraphCell
                cell.display(block)
                cell.selectionStyle = UITableViewCellSelectionStyle.None
                cell.answerField.delegate =  self
                tableView.rowHeight = UITableViewAutomaticDimension
                tableView.estimatedRowHeight = 160.0
                return cell

Answer 4

you should use didEndEditing delegate method which is getting called after editing will complete.

You can set tag to textview as indexpath.row means row number to differentiate the textview in delegate method.

Or you can implement delegate method in custom tableviewcell class.

Better way is to implement delegate method in viewcontroller and set tag to textview in cellforrowatindexpath .

hope this will help :)