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IOS UITextView

From WikiOD

Set attributed text[edit | edit source]

// Modify some of the attributes of the attributed string.
let attributedText = NSMutableAttributedString(attributedString: textView.attributedText!)

// Use NSString so the result of rangeOfString is an NSRange.
let text = textView.text! as NSString

// Find the range of each element to modify.
let tintedRange = text.range(of: NSLocalizedString("tinted", comment: ""))
let highlightedRange = text.range(of: NSLocalizedString("highlighted", comment: ""))

// Add tint.
attributedText.addAttribute(NSForegroundColorAttributeName, value: UIColor.blue, range: tintedRange)

// Add highlight.
attributedText.addAttribute(NSBackgroundColorAttributeName, value: UIColor.yellow, range: highlightedRange)

textView.attributedText = attributedText

Change font[edit | edit source]

Swift

//System Font
textView.font = UIFont.systemFont(ofSize: 12)

//Font of your choosing
textView.font = UIFont(name: "Font Name", size: 12)

Objective-C

//System Font
textView.font = [UIFont systemFontOfSize:12];

//Font of your choosing
textView.font = [UIFont fontWithName:@"Font Name" size:12];

Auto Detect Links, Addresses, Dates, and more[edit | edit source]

UITextView has built in support to auto detect a variety of data. The data that is able to be auto-detected currently includes:

enum {
   UIDataDetectorTypePhoneNumber   = 1 << 0,
   UIDataDetectorTypeLink          = 1 << 1,
   UIDataDetectorTypeAddress       = 1 << 2,
   UIDataDetectorTypeCalendarEvent = 1 << 3,
   UIDataDetectorTypeNone          = 0,
   UIDataDetectorTypeAll           = NSUIntegerMax
};

Enabling auto-detection[edit | edit source]

// you may add as many as you like by using the `|` operator between options
textView.dataDetectorTypes = (UIDataDetectorTypeLink | UIDataDetectorTypePhoneNumber);

If enabled, the text will appear as a hyperlink on the UITextView

Clickable data[edit | edit source]

To allow the link to be clicked (which will result in different actions depending on the data type) you must ensure that the UITextView is selectable but not editable and that user interaction is enabled

textView.editable = NO;
textView.selectable = YES;
textView.userInteractionEnabled = YES; // YES by default

Change text[edit | edit source]

Swift

textView.text = "Hello, world!"

Objective-C:

textView.text = @"Hello, world!";

Change text alignment[edit | edit source]

Swift

textView.textAlignment = .left

Objective-C

textView.textAlignment = NSTextAlignmentLeft;

UITextViewDelegate methods[edit | edit source]

Responding to Editing Notifications

  • textViewShouldBeginEditing(_:)
  • textViewDidBeginEditing(_:)
  • textViewShouldEndEditing(_:)
  • textViewDidEndEditing(_:)

Responding to Text Changes

  • textView(_:shouldChangeTextIn:replacementText:)
  • textViewDidChange(_:)

Responding to URL

  • textView(_: UITextView, shouldInteractWithURL: NSURL, inRange: NSRange) -> Bool

Change text color[edit | edit source]

Swift

textView.textColor = UIColor.red

Objective-C

textView.textColor = [UIColor redColor];

UITextView with HTML text[edit | edit source]

NSString *htmlString = @"<p> This is an <b>HTML</b> text</p>";
NSAttributedString *attributedString = [[NSMutableAttributedString alloc]
                                                        initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding]
                                                        options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType }
                                                        documentAttributes: nil
                                                        error: nil
                                                        ];
                _yourTextView.attributedText = attributedString;
                // If you want to modify the font
                field.font = [UIFont fontWithName:@"Raleway-Regular" size:15];

Check to see if empty or nil[edit | edit source]

Swift

if let text = self.textView.text where !text.isEmpty {
    // Do stuff for text
} else {
    // Do stuff for nil text or empty string
}

Objective-C

if (self.textView.text.length > 0){
    // Do stuff for text
}   else {
    // Do stuff for nil text or empty string
}

Getting and Setting the Cursor Postition[edit | edit source]

Useful information[edit | edit source]

The very beginning of the text field text:

let startPosition: UITextPosition = textView.beginningOfDocument

The very end of the text field text:

let endPosition: UITextPosition = textView.endOfDocument

The currently selected range:

let selectedRange: UITextRange? = textView.selectedTextRange

Get cursor position[edit | edit source]

if let selectedRange = textView.selectedTextRange {

    let cursorPosition = textView.offsetFromPosition(textView.beginningOfDocument, toPosition: selectedRange.start)

    print("\(cursorPosition)")
}

Set cursor position[edit | edit source]

In order to set the position, all of these methods are actually setting a range with the same start and end values.

To the beginning

let newPosition = textView.beginningOfDocument
textView.selectedTextRange = textView.textRangeFromPosition(newPosition, toPosition: newPosition)

To the end

let newPosition = textView.endOfDocument
textView.selectedTextRange = textView.textRangeFromPosition(newPosition, toPosition: newPosition)

To one position to the left of the current cursor position

// only if there is a currently selected range
if let selectedRange = textView.selectedTextRange {

    // and only if the new position is valid
    if let newPosition = textView.positionFromPosition(selectedRange.start, inDirection: UITextLayoutDirection.Left, offset: 1) {

        // set the new position
        textView.selectedTextRange = textView.textRangeFromPosition(newPosition, toPosition: newPosition)
    }
}

To an arbitrary position

Start at the beginning and move 5 characters to the right.

let arbitraryValue: Int = 5
if let newPosition = textView.positionFromPosition(textView.beginningOfDocument, inDirection: UITextLayoutDirection.Right, offset: arbitraryValue) {

    textView.selectedTextRange = textView.textRangeFromPosition(newPosition, toPosition: newPosition)
}

Related[edit | edit source]

Select all text

textView.selectedTextRange = textView.textRangeFromPosition(textView.beginningOfDocument, toPosition: textView.endOfDocument)

Select a range of text

// Range: 3 to 7
let startPosition = textView.positionFromPosition(textView.beginningOfDocument, inDirection: UITextLayoutDirection.Right, offset: 3)
let endPosition = textView.positionFromPosition(textView.beginningOfDocument, inDirection: UITextLayoutDirection.Right, offset: 7)

if startPosition != nil && endPosition != nil {
    textView.selectedTextRange = textView.textRangeFromPosition(startPosition!, toPosition: endPosition!)
}

Insert text at the current cursor position

textView.insertText("Hello")

Notes[edit | edit source]

  • This example originally comes from an adaptation of this Stack Overflow answer.
  • This answer uses a text field, but the same concepts apply to UITextView.
  • Use textView.becomeFirstResponder() to give focus to the text field and make the keyboard appear.
  • See this answer for how to get the text at some range.

Related[edit | edit source]

Remove extra paddings to fit to a precisely measured text.[edit | edit source]

UITextView has extra paddings by default. Sometimes it's annoying especially if you want to measure some text without view instance and place them at some area precisely.

Do this to remove such paddings.

messageTextView.textContainerInset = UIEdgeInsetsZero
messageTextView.textContainer.lineFragmentPadding = 0

Now you can measure text size using NSAttributedString.boundingRectWithSize(...), and resize a UITextView just to fit it to the text.

let budget = getSomeCGSizeBudget()
let text = getSomeAttributedString()
let textSize = text.boundingRectWithSize(budget, options: [.UsesLineFragmentOrigin, .UsesFontLeading], context: nil).size
messageTextView.frame.size = textSize // Just fits.

Credit:Stack_Overflow_Documentation