如何使用NSAttributedString objective-c为字符串的下划线加下划线

Question

仅在范围从零开始时，仅对字符串进行支撑。如果我从1开始它然后它的工作原理。绿色无论如何都有效。

+ (NSAttributedString*)returnNSAttributedString:(NSString*)string range:(NSRange)range WithColour:(UIColor*)colour WithUnderLine:(BOOL)underline {
    NSMutableAttributedString *attributedString =
    [[NSMutableAttributedString alloc] initWithString:string];
    if (underline) {
        [attributedString addAttributes:@{NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle)} range:range];
    }
    [attributedString addAttribute:NSForegroundColorAttributeName value:colour range:range];
    [attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSRangeFromString(string)];
    return attributedString;
}

适用于iOS 7而非iOS 8。

Answer 1

您可以使用NSUnderlineStyleAttributeName和NSUnderlineColorAttributeName属性。您可以像这样使用它：

NSRange foundRange = [wordString rangeOfString:@"Base Mix"];
if (foundRange.location != NSNotFound)
{
    [wordString beginEditing];
    [wordString addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInt:1] range:foundRange];
    [wordString addAttribute:NSUnderlineColorAttributeName value:[NSColor redColor] range:foundRange];
    [wordString endEditing];
}

Answer 2

<强>夫特：

一个小方法。获取一个字符串，并返回一个NSMutableAttributedString，其中包含完整字符串长度的下划线属性。

func getUnderlinedAttributedString(string string: String) -> NSMutableAttributedString
{
    let attributedString = NSMutableAttributedString.init(string: string)
    let stringRange = NSMakeRange(0, attributedString.length)

    attributedString.beginEditing()
    attributedString.addAttribute(NSUnderlineStyleAttributeName, value: 1, range: stringRange)
    attributedString.endEditing()

    return attributedString
}