Question posted in 
I’m pulling data from the Twitter API and have my table cells set up to contain a UITextView to display the tweet. I’m having a problem where sometimes the text will only take up a small part of the available space before wrapping, like in this image:
But if I go click back on the navigation controller, then reload the data it works as it should:
Can anyone explain why this is happening? Here is how my table view is set up:
func numberOfSections(in tableView: UITableView) -> Int {
if let tweets = timeline?.tweets {
return 1
}
return 0
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if timeline == nil {
return 0
} else {
if let _timeline = timeline {
return _timeline.tweets!.count
}
}
return 1
}
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableView.automaticDimension
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: Storyboard.TweetTableViewCell, for: indexPath) as! TweetTableViewCell
if let _timeline = timeline {
if let tweet = _timeline.tweets?[indexPath.row] {
cell.tweet = tweet
cell.tweetTextView.translatesAutoresizingMaskIntoConstraints = true
cell.tweetTextView.sizeToFit()
cell.tweetTextView.isScrollEnabled = false
}
}
return cell
}
And this is my TableViewCell:
class TweetTableViewCell: UITableViewCell {
@IBOutlet weak var profileImageView: UIImageView!
@IBOutlet weak var profileNameLabel: UILabel!
@IBOutlet weak var profileTwitterUsername: UILabel!
@IBOutlet weak var tweetTextView: UITextView!
@IBOutlet weak var tweetDateLabel: UILabel!
@IBOutlet weak var tweetTimeLabel: UILabel!
@IBOutlet weak var mediaImageView: UIImageView!
@IBOutlet weak var likesCountLabel: UILabel!
var tweet: Tweet? {
didSet {
self.updateUI()
}
}
func updateUI() {
if let tweet = tweet {
mediaImageView.isHidden = true
let profileImageOriginalSizeUrl = tweet.user.profile_image_url_https.replacingOccurrences(of: "_normal", with: "")
if let profileImageOriginalSizeUrl = URL(string: profileImageOriginalSizeUrl) {
profileImageView.sd_setImage(with: profileImageOriginalSizeUrl, completed: nil) // Get image from cache
}
roundProfileImage()
profileNameLabel.text = tweet.user.name
profileTwitterUsername.text = "@(tweet.user.screen_name)"
tweetTextView.textContainerInset = UIEdgeInsets.zero
tweetTextView.text = tweet.full_text
tweetDateLabel.text = truncateDate(withDate: tweet.created_at)
tweetTimeLabel.text = truncateTime(withDate: tweet.created_at)
}
if let media = tweet?.entities?.media?[0].media_url_https {
mediaImageView.isHidden = false
if let mediaImageUrl = URL(string: media) {
mediaImageView.sd_setImage(with: mediaImageUrl, completed: nil)
}
}
}
Also if it helps, here is my storyboard which contains the stack view holding the UITextView and UIImageView along with the constraints:
Console shows some of these warnings when app is running:
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x7b140004a6a0 h=--& v=--& UITextView:0x7b740006d600'I'm back with a brand new...'.height == 95.5 (active)>",
"<NSLayoutConstraint:0x7b1400045ba0 UITextView:0x7b740006d600'I'm back with a brand new...'.height == 100 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x7b1400045ba0 UITextView:0x7b740006d600'I'm back with a brand new...'.height == 100 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-08-03 04:57:43.373999+0100 StarChallenge[22459:10425072] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x7b140004a5b0 h=--& v=--& UITextView:0x7b740006d600'I'm back with a brand new...'.minX == 0 (active, names: '|':UIStackView:0x7b4c00045c80 )>",
"<NSAutoresizingMaskLayoutConstraint:0x7b140004a600 h=--& v=--& UITextView:0x7b740006d600'I'm back with a brand new...'.width == 348.5 (active)>",
"<NSLayoutConstraint:0x7b1400046e60 H:[UITextView:0x7b740006d600'I'm back with a brand new...']-(30)-| (active, names: '|':UIStackView:0x7b4c00045c80 )>",
"<NSLayoutConstraint:0x7b1400047040 H:|-(10)-[UIStackView:0x7b4c00045c80] (active, names: '|':UITableViewCellContentView:0x7b4c00045ac0 )>",
"<NSLayoutConstraint:0x7b1400047090 H:[UIStackView:0x7b4c00045c80]-(10)-| (active, names: '|':UITableViewCellContentView:0x7b4c00045ac0 )>",
"<NSLayoutConstraint:0x7b140004ae70 'fittingSizeHTarget' UITableViewCellContentView:0x7b4c00045ac0.width == 375 (active)>"
)
2
Answers
Your cell is done loading the data into the outlets before auto layout finishes setting up.
This is called after auto layout does it thing.
You set the constraint height of your TextView = 100. And after the resizing marks, the constrain height is 95.5 which is conflict with the previous value.
removeor set the priority of your TextView’s constraint height to low (250).Or use
UILabelinstead, you don’t have to set the constraint height for the label and don’t have to useAutoresizingMask&sizeToFit()as well.