how to make UITextView height dynamic according to

问题:

As you can see in this image

the UITextView changes it's height according to the text length, I want to make it adjust it's height according to the text length.

*I saw other questions, but solutions there didn't work for me

回答1:

this Works for me, all other solutions didn't.

func adjustUITextViewHeight(arg : UITextView)
{
    arg.translatesAutoresizingMaskIntoConstraints = true
    arg.sizeToFit()
    arg.scrollEnabled = false
}

In Swift 4 the syntax of arg.scrollEnabled = false has changed to arg.isScrollEnabled = false.

回答2:

Give this a try:

CGRect frame = self.textView.frame;
frame.size.height = self.textView.contentSize.height;
self.textView.frame = frame;

Edit- Here's the Swift:

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

回答3:

Followed by DeyaEldeen's answer.
In my case. I grow the textview height automatically by adding

swift 3

textView.translatesAutoresizingMaskIntoConstraints = false textView.isScrollEnabled = false

回答4:

Swift 4

Add It To Your Class

UITextViewDelegate

func textViewDidChange(_ textView: UITextView) {
      let fixedWidth = textView.frame.size.width
      textView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude))
      let newSize = textView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude))
      var newFrame = textView.frame
      newFrame.size = CGSize(width: max(newSize.width, fixedWidth), height: newSize.height)
      textView.frame = newFrame
}

回答5:

In Storyboard / Interface Builder simply disable scrolling in the Attribute inspector.

In code textField.isScrollEnabled = false should do the trick.

回答6:

it's straight forward to do in programatic way. just follow these steps

1. add an observer to content length of textfield

   [yourTextViewObject addObserver:self forKeyPath:@"contentSize" options:(NSKeyValueObservingOptionNew) context:NULL];
   

2. implement observer

   -(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
   UITextView *tv = object;
   
       //Center vertical alignment
       CGFloat topCorrect = ([tv bounds].size.height - [tv contentSize].height * [tv zoomScale])/2.0;
       topCorrect = ( topCorrect < 0.0 ? 0.0 : topCorrect );
       tv.contentOffset = (CGPoint){.x = 0, .y = -topCorrect};
   
   
       mTextViewHeightConstraint.constant = tv.contentSize.height;
   
       [UIView animateWithDuration:0.2 animations:^{
   
           [self.view layoutIfNeeded];
       }];
   
   }
   

3. if you want to stop textviewHeight to increase after some time during typing then implement this and set textview delegate to self.

   -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
   {
       if(range.length + range.location > textView.text.length)
       {
           return NO;
       }
   
       NSUInteger newLength = [textView.text length] + [text length] - range.length;
   
       return (newLength > 100) ? NO : YES;
   
   }
   

回答7:

just make a connection with your textView's height Constraint

@IBOutlet var textView: UITextView!
@IBOutlet var textViewHeightConstraint: NSLayoutConstraint!

and use this code below

textViewHeightConstraint.constant = self.textView.contentSize.height

回答8:

its working

func textViewDidChange(_ textView: UITextView) {
    let fixedWidth = textviewconclusion.frame.size.width
    textviewconclusion.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude))
    let newSize = textviewconclusion.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude))
    var newFrame = textviewconclusion.frame
    newFrame.size = CGSize(width: max(newSize.width, fixedWidth), height: newSize.height)
    textviewconclusion.frame = newFrame
}

回答9:

In my project, the view controller is involved with lots of Constraints and StackView, and I set the TextView height as a constraint, and it varies based on the textView.contentSize.height value.

step1: get a IB outlet

@IBOutlet weak var textViewHeight: NSLayoutConstraint!

step2: use the delegation method below.

extension NewPostViewController: UITextViewDelegate {
     func textViewDidChange(_ textView: UITextView) {
          textViewHeight.constant = self.textView.contentSize.height + 10
     }
}

回答10:

SWIFT 4

Change the size when typing

UITextViewDelegate

func textViewDidChange(_ textView: UITextView) {
        yourTextView.translatesAutoresizingMaskIntoConstraints = true
        yourTextView.sizeToFit()
        yourTextView.isScrollEnabled = false

        let calHeight = yourTextView.frame.size.height
        yourTextView.frame = CGRect(x: 16, y: 193, width: self.view.frame.size.width - 32, height: calHeight)
    }

Change the size when load

func textViewNotasChange(arg : UITextView) {
        arg.translatesAutoresizingMaskIntoConstraints = true
        arg.sizeToFit()
        arg.isScrollEnabled = false

        let calHeight = arg.frame.size.height
        arg.frame = CGRect(x: 16, y: 40, width: self.view.frame.size.width - 32, height: calHeight)
    }

Call the function of the second option like this:

textViewNotasChange(arg: yourTextView)

回答11:

Here are two pitfalls in iOS 8.3 when coming with textView.textContainer.maximumNumberOfLines = 10

Refer to my gist, please.

textView.attributedText = originalContent

let lineLimit = 10
textView.isEditable = true
textView.isScrollEnabled = false
textView.textContainerInset = .zero // default is (8, 0, 8, 0)
textView.textContainer.maximumNumberOfLines = lineLimit // Important condition
textView.textContainer.lineBreakMode = .byTruncatingTail

// two incomplete methods, which do NOT work in iOS 8.3

// size.width可能比maxSize.width小 ————遗憾的是 iOS 8.3 上此方法无视maximumNumberOfLines参数，所以得借助于UILabel
// size.width may be less than maxSize.width, ---- Do NOT work in iOS 8.3, which disregards textView.textContainer.maximumNumberOfLines
// let size = textView.sizeThatFits(maxSize) 

// 遗憾的是 iOS 8.3 上此方法失效了，得借助于UILabel
// Does not work in iOS 8.3
// let size = textView.layoutManager.usedRectForTextContainer(textView.textContainer).size 

// Suggested method: use a temperary label to get its size
let label = UILabel(); label.attributedText = originalContent
let size = label.textRect(forBounds: CGRect(origin: .zero, size: maxSize), limitedToNumberOfLines: lineLimit).size
textView.frame.size = size

回答12:

1 Add an observer to the content length of textfield

   yourTextView.addObserver(self, forKeyPath: "contentSize", options: (NSKeyValueObservingOptions.new), context: nil);

2 Implement observer

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        let tv = object as! UITextView;
        var topCorrect = (tv.bounds.size.height - tv.contentSize.height * tv.zoomScale)/2.0;
        topCorrect = ( topCorrect < 0.0 ? 0.0 : topCorrect );
        tv.contentOffset.x = 0;
        tv.contentOffset.y = -topCorrect;
        self.yourTextView.contentSize.height = tv.contentSize.height;
        UIView.animate(withDuration: 0.2, animations: {
            self.view.layoutIfNeeded();
        });
    }

回答13:

Better yet swift 4 add as an extension:

extension UITextView {
    func resizeForHeight(){
        self.translatesAutoresizingMaskIntoConstraints = true
        self.sizeToFit()
        self.isScrollEnabled = false
    }
}

回答14:

You can do that with IB.

1. Create outlet from UITextView height constraint.

2. Inherit your UIViewController from UITextViewDelegate

3. Then

`

func textViewDidChange(_ textView: UITextView) {

    // calculate text height
    let constraintRect = CGSize(width: textView.frame.width,
                                height: .greatestFiniteMagnitude)
    let boundingBox = self.boundingRect(with: constraintRect,
                                        options: .usesLineFragmentOrigin,
                                        attributes: [.font: textView.font],
                                        context: nil)
    let height = ceil(boundingBox.height)

    // textViewHeightConstraint - your height constraint outlet from IB
    if height > textViewHeightConstraint.constant {
        textViewHeightConstraint.constant = height

        UIView.animate(withDuration: 0.3, animations: {
            self.view.layoutIfNeeded()
        })
    }
}`