Question

Right Now I am making an iOS app and I would like to implement the ability to remove letters in a UILabel by simply “Dropping the letter”. The part That I am having an issue with is adding a gesture recognizer to individual letters of a UILabel. I have already searched the web for this and have nothing.Just to be clear, I am NOT adding a gesture recognizer to the whole label, I am only wanting to add it to individual letters. Any help is greatly appreciated.

Thanks

Answer 1

It seems that the easiest way to do it is by dynamically calculating the position of a letter. Use this:

CGSize textSize = [text sizeWithFont:[UIFont boldSystemFontOfSize:size]
                   constrainedToSize:constrainedSize
                       lineBreakMode:NSLineBreakByWordWrapping];

so you can get the the size for a letter in the font and size you are using for each label and using the [stringInstance length] property and the [UILabel numberOfLines] property to get the approximate center for each letter in a label, then use a simple tapGestureRecognizer for each label and in there calling your method for

- (NSString*)letterForPoint:(CGPoint)tapCenter inLabel:(UILabel*)label;

there you use everything to calculate the approximate center for each letter and adding a selectableRange for error and correct user responding as x +- 20 pixels and y +- 20 pixels.

Apple says that anything with a selectable bound lesser than 40 pixels for 40 pixels will be completely annoying for the user, so your font size should actually be quite big for user interaction.