UITextView insert text in the textview text - iphone

Question

I want to have to occasionally insert text into the UITextView text object. For example, if the user presses the "New Paragraph" button I would like to insert a double newline instead of just the standard single newline.
How can I go about such? Do i have to read the string from UITextView, mutate it, and write it back? Then how would I know where the pointer was?
Thanks

Answer 1

Since the text property of UITextView is immutable, you have to create a new string and set the text property to it. NSString has an instance method (-stringByAppendingString:) for creating a new string by appending the argument to the receiver:
textView.text = [textView.text stringByAppendingString:#"\n\n"];

Answer 2

UITextview has an insertText method and it respects cursor position.
- (void)insertText:(NSString *)text
for example:
[myTextView insertText:#"\n\n"];

Answer 3

Here's how I implemented it and it seems to work nicely.
- (void) insertString: (NSString *) insertingString intoTextView: (UITextView *) textView
{
NSRange range = textView.selectedRange;
NSString * firstHalfString = [textView.text substringToIndex:range.location];
NSString * secondHalfString = [textView.text substringFromIndex: range.location];
textView.scrollEnabled = NO; // turn off scrolling or you'll get dizzy ... I promise
textView.text = [NSString stringWithFormat: #"%#%#%#",
firstHalfString,
insertingString,
secondHalfString];
range.location += [insertingString length];
textView.selectedRange = range;
textView.scrollEnabled = YES; // turn scrolling back on.
}

Answer 4

For Swift 3.0
You can append text by calling method insertText of UITextView Instance.
Example:
textView.insertText("yourText")

Answer 5

This is a correct answer!
The cursor position is also right.
A scroll position is also right.
- (void) insertString: (NSString *) insertingString intoTextView: (UITextView *) textView
{
[textView replaceRange:textView.selectedTextRange withText:insertingString];
}

Answer 6

- (void)insertStringAtCaret:(NSString*)string {
UITextView *textView = self.contentCell.textView;
NSRange selectedRange = textView.selectedRange;
UITextRange *textRange = [textView textRangeFromPosition:textView.selectedTextRange.start toPosition:textView.selectedTextRange.start];
[textView replaceRange:textRange withText:string];
[textView setSelectedRange:NSMakeRange(selectedRange.location + 1, 0)];
self.changesDetected = YES; // i analyze the undo manager in here to enabled/disable my undo/redo buttons
}