I try to underline part of a string, for example, a 'string' part in 'test string' string. I'm using NSMutableAttributedString
and my solution was working well on iOS7
.
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc]
initWithString:@"test string"];
[attributedString addAttribute:NSUnderlineStyleAttributeName
value:@(NSUnderlineStyleSingle)
range:NSMakeRange(5, 6)];
myLabel.attributedText = attributedString;
The problem is that my solution is not working in iOS8
anymore. After spending an hour on testing multiple variants of NSMutableAttributedString
, I found out that this solution works only when range starts with 0 (length can differ). What is the reason for that? How can I workaround this?
Update: By investigating this question: Displaying NSMutableAttributedString on iOS 8 I finally found the solution!
You should add NSUnderlineStyleNone at the beginning of the string.
Swift 4.2 (none
was removed):
let attributedString = NSMutableAttributedString()
attributedString.append(NSAttributedString(string: "test ",
attributes: [.underlineStyle: 0]))
attributedString.append(NSAttributedString(string: "s",
attributes: [.underlineStyle: NSUnderlineStyle.single.rawValue]))
attributedString.append(NSAttributedString(string: "tring",
attributes: [.underlineStyle: 0]))
Objective-C:
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] init];
[attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:@"test "
attributes:@{NSUnderlineStyleAttributeName: @(NSUnderlineStyleNone)}]];
[attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:@"s"
attributes:@{NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle),
NSBackgroundColorAttributeName: [UIColor clearColor]}]];
[attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:@"tring"]];
Another bonus of such approach is absence of any ranges. Very nice for localized strings.
Seems like it is Apple bug :(