如何截断cocos2dV3.0中的标签

Question

我试图在文字变大时截断标签，而是从中心向左侧展开。

这是我的摘录。

 CCLabelTTF *playerLabel = [CCLabelTTF labelWithString:[NSString stringWithFormat:@"Playerdadsadsd %d",i+1] fontName:@"Helvetica-Bold" fontSize:fontSize];

        playerLabel.color =  playerColor;
        playerLabel.name = [NSString stringWithFormat:@"%d",1002+i];
        playerLabel.position = ccp(playerSprite.position.x + playerSprite.contentSize.width + 10, yPos);
        playerLabel.adjustsFontSizeToFit = YES;
        [self addChild:playerLabel];

Answer 1

我不确定您要实现的目标，但请尝试将dimensions参数传递给init方法：

//The label won't go out of this rectangle
CGSize rect = CGSizeMake(viewSize.width * 0.1f, viewSize.height * 0.1f);

NSString *text = [NSString stringWithFormat:@"Playerdadsadsd %d",i+1];
CCLabelTTF *playerLabel = [CCLabelTTF labelWithString: text 
                                             fontName: @"Helvetica-Bold"
                                             fontSize: fontSize
                                           dimensions: rect]; // <-- Note this parameter

//.. the rest of your code..

Answer 2

我没有在cocos2d-x中找到任何内部解决方案来截断（有或没有省略号）标签以适应指定的宽度，所以我写了一个我自己的函数。

这是在C ++中，但逻辑可以轻松复制到Objective-C

CCLabelTTF *createTruncatedLabel(const char *text, const char *fontFace, float fontSize, int width, bool useEllipsis)
{
    CCLabelTTF *ttfLabel = CCLabelTTF::create(text, fontFace, fontSize, CCSizeMake(0, 0), kCCTextAlignmentLeft);
    CCSize size = ttfLabel->getContentSize();

    if (size.width > width)
    {
        int len = strlen(text);
        float pc = (float)width / (float)size.width;
        int newLen = (int)((float)len * pc);
        size = setTruncLabel(ttfLabel, text, newLen, useEllipsis);

        if (size.width > width)
        {
            while (size.width > width)
            {
                newLen--;
                size = setTruncLabel(ttfLabel, text, newLen, useEllipsis);
            }
        }
        else
        {
            while (size.width < width)
            {
                newLen++;
                size = setTruncLabel(ttfLabel, text, newLen, useEllipsis);
            }

            if (size.width > width)
            {
                newLen--;
                setTruncLabel(ttfLabel, text, newLen, useEllipsis);
            }
        }
    }

    return ttfLabel;
}

CCSize setTruncLabel(CCLabelTTF *ttfLabel, const char*text, int len, bool useEllipsis)
{
    char newText[256] = {0};

    strncpy(newText, text, len);

    if (useEllipsis)
    {
        strcat(newText, "...");
    }

    ttfLabel->setString(newText);
    CCSize size = ttfLabel->getContentSize();

    return size;
}