Example:
CGFloat maxWidth = 150;
NSAttributedString *s =
[[NSAttributedString alloc]
initWithString:@"The quick brown fox jumped over the lazy dog."
attributes:@{NSFontAttributeName:[UIFont fontWithName:@"GillSans" size:20]}];
NSTextContainer* tc =
[[NSTextContainer alloc] initWithSize:CGSizeMake(maxWidth,CGFLOAT_MAX)];
NSLayoutManager* lm = [NSLayoutManager new];
NSTextStorage* tm = [[NSTextStorage alloc] initWithAttributedString:s];
[tm addLayoutManager:lm];
[lm addTextContainer:tc];
[lm enumerateLineFragmentsForGlyphRange:NSMakeRange(0,lm.numberOfGlyphs)
usingBlock:^(CGRect rect, CGRect usedRect,
NSTextContainer *textContainer,
NSRange glyphRange, BOOL *stop) {
NSRange r = [lm characterRangeForGlyphRange:glyphRange actualGlyphRange:nil];
NSLog(@"%@", [s.string substringWithRange:r]);
}];