UILable 터치시 단어 가져오기

NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:labelText];
NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
[textStorage addLayoutManager:layoutManager];
CGRect bounds = label.bounds;
NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:bounds.size];
[layoutManager addTextContainer:textContainer];

Now you just need to find the index of the character that was clicked, which is simple!

NSUInteger characterIndex = [layoutManager characterIndexForPoint:location
                                                  inTextContainer:textContainer
                         fractionOfDistanceBetweenInsertionPoints:NULL];

Which makes it trivial to find the word itself:

if (characterIndex < textStorage.length) {
  [labelText.string enumerateSubstringsInRange:NSMakeRange(0, textStorage.length)
                                       options:NSStringEnumerationByWords
                                    usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
                                      if (NSLocationInRange(characterIndex, enclosingRange)) {
                                        // Do your thing with the word, at range 'enclosingRange'
                                        *stop = YES;
                                      }
                                    }];
}

다른 방법

1) Subclass UILabel, and add a touchesEnded: to recognize touches on your label.
2) Store in an array all the sizes of the letters using system method sizeWithFont:
3) Get the touch point and compare with the letters size.
Done!

Create an UILabel subclass

//
// APLabel.h
//
#import <uikit /UIKit.h>

@protocol APLabelDelegate <nsobject>
@required
  - (void) didLetterFound:(char)letter;
@end

@interface APLabel : UILabel

@property (nonatomic, assign) id <aplabeldelegate> delegate;

@end

//
// APLabel.m
//
#import "APLabel.h"

@implementation APLabel

- (id)initWithCoder:(NSCoder *)aDecoder
{
  if ( self = [super initWithCoder:aDecoder])
  {
    self.backgroundColor          = [UIColor greenColor];
    self.userInteractionEnabled   = YES;
  }
  return self;
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
  UITouch *touch = [[touches allObjects] objectAtIndex:0];
  CGPoint pos    = [touch locationInView:self];

  int sizes[self.text.length];
  for ( int i=0; i<self .text.length; i++ )
  {
    char letter         = [self.text characterAtIndex:i];
    NSString *letterStr = [NSString stringWithFormat:@"%c", letter];
    
    CGSize letterSize   = [letterStr sizeWithFont:self.font];
    sizes[i]            = letterSize.width;
  }

  int sum = 0;
  for ( int i=0; i<self.text.length; i++)
  {
    sum += sizes[i];
    if ( sum >= pos.x )
    {
      [ _delegate didLetterFound:[ self.text characterAtIndex:i] ];
      return;
    }
  }
}
@end