Question

我创建了一个UILabel。当文本太长时，我希望使用（.. more）替换（...）。我已经尝试过了，但我没有要求结果。

UILabel * writtenContentLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 0, ScreenWidth - 20 , 70)];
writtenContentLabel.numberOfLines = 0;
writtenContentLabel.text = [str stringByAppendingString:@"More"];
writtenContentLabel.lineBreakMode = NSLineBreakByTruncatingMiddle;
[self addSubview:writtenContentLabel];

我该怎么办？

Answer 1

您必须使用自定义标签视图才能实现此目的。

将UILabels替换为以下任何自定义标签。它们都支持自定义truncationTokenString方法。

MDHTMLLabel https://github.com/mattdonnelly/MDHTMLLabel （我推荐此控件）
TTTAtributtedLabel https://github.com/mattt/TTTAttributedLabel

您可以使用

更改默认省略号

[label setTruncationTokenString:@"...More"];

Answer 2

您可以使用以下方法：

- (NSString*)stringWithElipsisMore:(NSString*)oringinalStr withLabel:(UILabel*)label
{
    CGRect rect = label.frame;

    NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];

    NSDictionary * attributes = @{NSFontAttributeName:label.font, NSParagraphStyleAttributeName:paragraphStyle};
    const CGSize maxSize = CGSizeMake(rect.size.width, CGFLOAT_MAX);
    CGSize stringSize = [oringinalStr boundingRectWithSize:maxSize
                                           options:NSStringDrawingUsesLineFragmentOrigin
                                        attributes:attributes
                                           context:nil].size;

    if (stringSize.height > rect.size.height) {
        float proportion = rect.size.height / stringSize.height;
        NSString *subStr = [oringinalStr substringToIndex:oringinalStr.length * proportion];

        CGSize stringSize = [subStr boundingRectWithSize:maxSize
                                                  options:NSStringDrawingUsesLineFragmentOrigin
                                               attributes:attributes
                                                  context:nil].size;
        while (stringSize.height < rect.size.height) {
            subStr = [oringinalStr substringToIndex:subStr.length + 1];
            stringSize = [subStr boundingRectWithSize:maxSize
                                               options:NSStringDrawingUsesLineFragmentOrigin
                                            attributes:attributes
                                               context:nil].size;
        }

        subStr = [subStr substringToIndex:subStr.length - 1];

        while (stringSize.height > rect.size.height){
            subStr = [subStr substringToIndex:subStr.length - 1];
            stringSize = [subStr boundingRectWithSize:maxSize
                                                     options:NSStringDrawingUsesLineFragmentOrigin
                                                  attributes:attributes
                                                     context:nil].size;
        }

        NSRange range = NSMakeRange(subStr.length - 7, 7);
        NSString *subSubStr = [subStr stringByReplacingCharactersInRange:range withString:@"...more"];
        return subSubStr;
    } else {
        return oringinalStr;
    }
}


    NSString *subStr = [self stringWithElipsisMore:str withLabel:writtenContentLabel];
    writtenContentLabel.text = subStr;

当文本太长时，如何用（...更多）替换（...）

2 个答案: