从iOS中的UILabel中删除括号[重复]

Question

我昨天发布了这个问题：Removing parentheses from the string in iOS。但我仍然无法从标签中删除括号。

不知道我的错误是什么。整夜琢磨，还是没搞定。

我正在使用 TTTAttributedLabel。我的代码如下所示：

-(TTTAttributedLabel*)setItalicTextForLabel:(TTTAttributedLabel*)attributedLabel fontSize:(float)Size
{
    [attributedLabel setText:[self.infoDictionary objectForKey:@"description"] afterInheritingLabelAttributesAndConfiguringWithBlock:^NSMutableAttributedString *(NSMutableAttributedString *mutableAttributedString)
    {
        NSRange stringRange = NSMakeRange(0, [mutableAttributedString length]);
        NSRegularExpression *regexp = ParenthesisRegularExpression();
        UIFont *italicSystemFont = [UIFont italicSystemFontOfSize:Size];
        DLog(@"%@",italicSystemFont.fontName);
        CTFontRef italicFont = CTFontCreateWithName((__bridge CFStringRef)italicSystemFont.fontName, italicSystemFont.pointSize, NULL);
        [regexp enumerateMatchesInString:[mutableAttributedString string] options:0 range:stringRange usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
            if (italicFont) {
                [mutableAttributedString removeAttribute:(NSString *)kCTFontAttributeName range:result.range];
                [mutableAttributedString addAttribute:(NSString *)kCTFontAttributeName value:(__bridge id)italicFont range:result.range];
                CFRelease(italicFont);
            }
        }];

        return mutableAttributedString;
    }];
    [[attributedLabel.text stringByReplacingOccurrencesOfString:@"[" withString:@""] stringByReplacingOccurrencesOfString:@"]" withString:@""];
    return attributedLabel;
}

仍然无法删除括号。谁能指出我的错误？非常感谢您的帮助。

Answer 1

尝试将最后两行换成这两行：

[attributedLabel setText:[[attributedLabel.text stringByReplacingOccurrencesOfString:@"[" withString:@""] stringByReplacingOccurrencesOfString:@"]" withString:@""]];
return attributedLabel;

以string...开头的方法不会改变字符串本身，只会返回一个被改变的新字符串。

顺便说一下，NSString 对象是不可变的。如果你想改变字符串，你可以使用 NSMutableString，下面的实现只使用你已经在块中使用的 NSMutabeString。

-

试试这个：

-(TTTAttributedLabel*)setItalicTextForLabel:(TTTAttributedLabel*)attributedLabel fontSize:(float)Size
{
    [attributedLabel setText:[self.infoDictionary objectForKey:@"description"] afterInheritingLabelAttributesAndConfiguringWithBlock:^NSMutableAttributedString *(NSMutableAttributedString *mutableAttributedString)
    {
        NSRange stringRange = NSMakeRange(0, [mutableAttributedString length]);
        NSRegularExpression *regexp = ParenthesisRegularExpression();
        UIFont *italicSystemFont = [UIFont italicSystemFontOfSize:Size];
        DLog(@"%@",italicSystemFont.fontName);
        CTFontRef italicFont = CTFontCreateWithName((__bridge CFStringRef)italicSystemFont.fontName, italicSystemFont.pointSize, NULL);
        [regexp enumerateMatchesInString:[mutableAttributedString string] options:0 range:stringRange usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
            if (italicFont) {
                [mutableAttributedString removeAttribute:(NSString *)kCTFontAttributeName range:result.range];
                [mutableAttributedString addAttribute:(NSString *)kCTFontAttributeName value:(__bridge id)italicFont range:result.range];
                CFRelease(italicFont);
                NSRange range1 = NSMakeRange (result.range.location, 1); 
                NSRange range2 = NSMakeRange (result.range.location + result.range.length-2, 1); 
                [mutableAttributedString replaceCharactersInRange:range1 withString:@""];
                [mutableAttributedString replaceCharactersInRange:range2 withString:@""];
            }
        }];
        return mutableAttributedString;
    }];
    return attributedLabel;
}