在UILabel

Question

我需要在UILabel中使用wordwrap显示两行半行文本，然后在其中添加三个点“...”。

我在UILabel中有一个UITableViewCell，当前显示三行文字然后用“...”截断文本但现在我需要显示最后一行减半意味着2.5行大文中的文字。

Answer 1

你应该去界面构建器，或者去做代码，但你需要实现的是通过将行数从1或0更改为3来完成，如下图所示：

这就是你需要的吗？

Answer 2

如果你在tableView中有标签

cell.textLabel.lineBreakMode = NSLineBreakByWordWrapping;    

下面一行显示你点到底

cell.textLabel.lineBreakMode = NSLineBreakByTruncatingTail;

Answer 3

只是做一个逻辑..

1. 得不到。 N行
2. 如果N = 1，请执行NONE
3. 如果N = 2，则第2行中的字符> X，chop＆amp; X-3并追加“......”
4. 如果N = 3，则第3行中的字符> X，chop＆amp; X-3并追加“......”

假设X应该是你允许的最大字符数。

这里我附上样本和X - ＆gt; 22

#import <CoreText/CoreText.h>

+ (NSArray *)getLinesArrayOfStringInLabel:(UILabel *)label {
    NSString *text = [label text];
    UIFont   *font = [label font];
    CGRect    rect = [label frame];

    CTFontRef myFont = CTFontCreateWithName((__bridge CFStringRef)([font fontName]), [font pointSize], NULL);
    NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:text];
    [attStr addAttribute:(NSString *)kCTFontAttributeName value:(__bridge id)myFont range:NSMakeRange(0, attStr.length)];


    CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)attStr);

    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddRect(path, NULL, CGRectMake(0,0,rect.size.width,100000));

    CTFrameRef frame = CTFramesetterCreateFrame(frameSetter, CFRangeMake(0, 0), path, NULL);

    NSArray *lines = (__bridge NSArray *)CTFrameGetLines(frame);
    NSMutableArray *linesArray = [[NSMutableArray alloc]init];

    for (id line in lines)
    {
        CTLineRef lineRef = (__bridge CTLineRef )line;
        CFRange lineRange = CTLineGetStringRange(lineRef);
        NSRange range = NSMakeRange(lineRange.location, lineRange.length);

        NSString *lineString = [text substringWithRange:range];
        [linesArray addObject:lineString];
    }

    return (NSArray *)linesArray;
}

+(void) trimUILableForPopupNG:(UILabel*) inputLabel
{
    BOOL isTruncated = false;
    NSInteger lineCount = 0;
    CGSize textSize = CGSizeMake(inputLabel.frame.size.width, MAXFLOAT);
    int rHeight = lroundf([inputLabel sizeThatFits:textSize].height);
    int charSize = lroundf(inputLabel.font.lineHeight);
    lineCount = rHeight/charSize;
    if (lineCount > 1) {
            // performActionDesc.lineBreakMode =  NSLineBreakByTruncatingMiddle;
        NSArray *linesArray = [AppData getLinesArrayOfStringInLabel:inputLabel];

        NSString *texttoTrim = @"",*texttoAdd = @"";

        if (linesArray.count >= 3) {

            for (int x = 0; x < 3; x++) {

                texttoTrim = [linesArray objectAtIndex:x];

                if (x == 2  && texttoTrim.length >= 22) {

                    int find70_Length = [texttoTrim length]*0.65;
                    texttoTrim = [[linesArray objectAtIndex:x] substringToIndex:find70_Length];
                    isTruncated = true;
                }

                texttoAdd =  [texttoAdd stringByAppendingString:texttoTrim];
            }

        }
        else if (linesArray.count >= 2)
        {
            for (int x = 0; x < 2; x++) {

                texttoTrim = [linesArray objectAtIndex:x];

                if (x == 1 && texttoTrim.length >= 22) {

                    int find70_Length = [texttoTrim length]*0.7;
                    texttoTrim = [[linesArray objectAtIndex:x] substringToIndex:find70_Length];
                    isTruncated = true;
                }

                texttoAdd =  [texttoAdd stringByAppendingString:texttoTrim];
            }
        }

        if (isTruncated) {
            texttoAdd = [texttoAdd stringByAppendingString:@"..."];
            inputLabel.text = @"";
            inputLabel.text  = texttoAdd;
        }

    }
}

[ClassName trimUILableForPopupNG:yourLabel];

在这里，我编写了添加的代码＆＃34; ...＆＃34;显示超过80％字符的2和3行..

如果你想让它为50％只需改变X值..