[英]Underline part of a string using NSMutableAttributedString in iOS 8 is not working
I try to underline part of a string, for example, a ' string ' part in ' test string ' string.我尝试在字符串的一部分下划线,例如,“测试字符串”字符串中的“字符串”部分。 I'm using NSMutableAttributedString
and my solution was working well on iOS7
.我正在使用NSMutableAttributedString
并且我的解决方案在iOS7
上运行良好。
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.问题是我的解决方案不再适用于iOS8
。 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).在花了一个小时测试NSMutableAttributedString
多个变体后,我发现这个解决方案只有在范围从 0 开始时才有效(长度可以不同)。 What is the reason for that?这是什么原因? How can I workaround this?我该如何解决这个问题?
Update: By investigating this question: Displaying NSMutableAttributedString on iOS 8 I finally found the solution!更新:通过调查这个问题: Displaying NSMutableAttributedString on iOS 8我终于找到了解决方案!
You should add NSUnderlineStyleNone at the beginning of the string.您应该在字符串的开头添加 NSUnderlineStyleNone。
Swift 4.2 ( none
was removed): Swift 4.2( none
删除):
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:目标-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.这种方法的另一个好处是没有任何范围。 Very nice for localized strings.非常适合本地化的字符串。
Seems like it is Apple bug :(好像是苹果的bug :(
I found that if you apply UnderlineStyleNone to the whole string you can then selectively apply underline to a part that starts in the middle:我发现如果将 UnderlineStyleNone 应用于整个字符串,则可以有选择地将下划线应用于从中间开始的部分:
func underlinedString(string: NSString, term: NSString) -> NSAttributedString {
let output = NSMutableAttributedString(string: string)
let underlineRange = string.rangeOfString(term)
output.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.StyleNone.rawValue, range: NSMakeRange(0, string.length))
output.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.StyleSingle.rawValue, range: underlineRange)
return output
}
NSMutableAttributedString *signUpString = [[NSMutableAttributedString alloc] initWithString:@"Not a member yet?Sign Up now"];
[signUpString appendAttributedString:[[NSAttributedString alloc] initWithString:@" "attributes:@{NSUnderlineStyleAttributeName: @(NSUnderlineStyleNone)}]];
[signUpString addAttributes: @{NSForegroundColorAttributeName:UIColorFromRGB(0x43484B),NSUnderlineStyleAttributeName:[NSNumber numberWithInteger:NSUnderlineStyleSingle]} range:NSMakeRange(17,11)];
signUpLbl.attributedText = [signUpString copy];
It worked for me它对我有用
It's September 2018, so this answer is not about iOS8 but it still relates to underlining part of a string.现在是 2018 年 9 月,所以这个答案与 iOS8 无关,但它仍然与字符串的下划线部分有关。
Here is a Swift 4 extension that underlines a given term within an already composed myAttributedString
这是一个Swift 4扩展,它在已经组成的myAttributedString
中强调给定的术语
extension NSMutableAttributedString {
func underline(term: String) {
guard let underlineRange = string.range(of: term) else {
return
}
let startPosition = string.distance(from: term.startIndex, to: underlineRange.lowerBound)
let nsrange = NSRange(location: startPosition, length: term.count)
addAttribute(
.underlineStyle,
value: NSUnderlineStyle.styleSingle.rawValue,
range: nsrange)
}
}
Usage: myAttributedString.underline(term: "some term")
用法: myAttributedString.underline(term: "some term")
Swift 5 version of @Joss's answer with few modifications, by adding a returned NSMutableAttributedString, because I couldn't use the original solution without it.通过添加返回的 NSMutableAttributedString,@Joss 答案的Swift 5 版本几乎没有修改,因为没有它我无法使用原始解决方案。
extension NSMutableAttributedString {
func underline(term: String) -> NSMutableAttributedString {
guard let underlineRange = string.range(of: term) else {
return NSMutableAttributedString()
}
let startPosition = string.distance(from: term.startIndex, to: underlineRange.lowerBound)
let nsrange = NSRange(location: startPosition, length: term.count)
addAttribute(
.underlineStyle,
value: NSUnderlineStyle.single.rawValue,
range: nsrange)
return self
}
}
Usage:用法:
let myUnderLinedText = "Hello World"
let underLinedMutableString = NSMutableAttributedString(string: myUnderLinedText, attributes: titleAttributes).underline(term: myUnderLinedText)
I used the following extension (using exidy's function) in playground/simulator and it worked fine , you may change/add attributes depending on your needs我在操场/模拟器中使用了以下扩展(使用 exidy 的功能)并且它运行良好,您可以根据需要更改/添加属性
extension NSMutableAttributedString
{
func changeWordsColour(terms:[NSString])
{
let string = self.string as NSString
self.addAttribute(NSForegroundColorAttributeName, value: UIColor.brownColor(), range: NSMakeRange(0, self.length))
for term in terms
{
let underlineRange = string.rangeOfString(term as String)
self.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: underlineRange)
}
}
}
let myStr = NSMutableAttributedString(string: "Change Words Colour")
myStr.changeWordsColour(["change","Colour"])
let values = NSMutableAttributedString(string: "**YourString**")
let range = NSRange(location: 0, length: values.length)
values.addAttribute(.underlineStyle, value: 1, range: range)
This will make the string with underlined style, also you can replace the .underlinestyle and use .link to show it as a hyperlink in blue color这将使字符串带有下划线样式,您也可以替换 .underlinestyle 并使用 .link 将其显示为蓝色超链接
Add color for underline attribute:为下划线属性添加颜色:
[attributedString addAttribute:NSUnderlineColorAttributeName
value:[UIColor redColor]
range:NSMakeRange(5, 6)];
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