Show more button next to end of text Swift - ios

I want to show more button at the end of the text or below if there isn't enough space. I don't understand how Apple developers did this?
Please answer in swift. After clicking on more button i want to show all the text. change the button to less.
Thanks in advance.

Here's a great CocoaPod for the functionality you're looking for.
https://github.com/ilyapuchka/ReadMoreTextView
This will allow you to set a maximum number of lines and customise the text append to the end of the trimmed text. You can change the font and color since it is an NSAttributedString.

If you add more than 4-5 view controllers to a TabBar Controller, either in storyboard or programmatically(adding array of controllers to a tabar controller), it automatically show a more item as a tabar item in TabBar.

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One approach is to create the pickerview and textField in code and add it to the view.
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I would like that all my views (the tab bar and nav bar too) to be dark gray and hence all the text previously mentioned to be white.
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BTW: I´m fairly new to xcode and programming...
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What I did was, to have two button one for the label and one for the image and when one is clicked it propagates the message to the other and does the action depending on which one was clicked.

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