Question

昨天我发布了这个问题：Removing parentheses from the string in iOS。但我仍然无法从标签上删除括号。

不确定我的错误。花了一整夜的时间来计算，仍然无法做到。

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;
}

仍然无法移除括号。谁能指出我的错误？真的很感激帮助。

Answer 1

尝试用这两个来改变最后两行：

[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更改的新字符串。

顺便说一句，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;
}

在iOS中从UILabel中删除括号

1 个答案: