Control cursor position in UITextField

user_182051 0
Viewed 47728

I have a UITextField that I'm forcing formatting on by modifying the text inside the change notification handler. This works great (once I solved the reentrancy issues) but leaves me with one more nagging problem. If the user moves the cursor someplace other than the end of the string then my formatting change moves it to the end of the string. This means users cannot insert more than one character at a time into the middle of the text field. Is there a way to remember and then reset the cursor position in the UITextField?

uitextrange uitextposition uitextfield iphone ios
7 Answers

Here's the Swift version of @Chris R. – updated for Swift3

private func selectTextForInput(input: UITextField, range: NSRange) {
    let start: UITextPosition = input.position(from: input.beginningOfDocument, offset: range.location)!
    let end: UITextPosition = input.position(from: start, offset: range.length)!
    input.selectedTextRange = input.textRange(from: start, to: end)
}
user_9924610

Feel free to use this UITextField category to get and set cursor position:

@interface UITextField (CursorPosition)

@property (nonatomic) NSInteger cursorPosition;

@end

–

@implementation UITextField (CursorPosition)

- (NSInteger)cursorPosition
{
    UITextRange *selectedRange = self.selectedTextRange;
    UITextPosition *textPosition = selectedRange.start;
    return [self offsetFromPosition:self.beginningOfDocument toPosition:textPosition];
}

- (void)setCursorPosition:(NSInteger)position
{
    UITextPosition *textPosition = [self positionFromPosition:self.beginningOfDocument offset:position];
    [self setSelectedTextRange:[self textRangeFromPosition:textPosition toPosition:textPosition]];
}

@end
user_1414940
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