Question

我有一个UILabel，其属性text我想将文字段落设置为使用NSString。

我有一个数组，其中存储了一系列代表文本段落的字符。

该段落不必完全符合/包含在此UILabel中。如果段落没有结束，我会转到下一个标签。

如果我有这个UILabel 160 X 240的矩形大小，我怎么能够确定正确的字体大小才能很好地填充UILabel的这个字符串？

根据屏幕上矩形的大小，是否有计算字体大小的数学方法？

例如：

UILabel *aLabel = [[UIlabel alloc] initwithFrame(CGRect){{0, 0}, 160, 240}];
aLabel.font = [UIFont fontWithName:@"Courier New" size:<???>]; //(font unit in points)

NSMutableString *aString = [[NSMutableString alloc] init];

//The following tries to fit the character one by one within the label rect based on   
//the width and height of the UILabel by appending String
int index = 0;
for(int x = 0; x < 240; x+=<???>) //height of label (pixel unit)
{
    for(int y = 0; y < 160; y+=<???>) //width of label (pixel unit)
    {
        [aString appendWithString:[paragraphArray objectAtIndex:index]];
        index++;
    }
    [aString appendWithString:@\n"];  //line break
}
aLabel.text = aString;

我怎样才能确定???的值？是（for循环的字体大小和像素大小）？

如果这不是执行此类任务的最佳方式，请另外建议我。

Answer 1

+(void)resizeFontForLabel:(UILabel*)aLabel{

    // use font from provided label so we don't lose color, style, etc
    UIFont *font = aLabel.font;

    float lblWidth = aLabel.frame.size.width;
    float lblHeight = aLabel.frame.size.height;

    CGFloat fontSize = [font pointSize];
    UIFont *newFont = font;
    TRC_DBG(@"%@", aLabel.text);
    CGFloat height = [aLabel.text sizeWithFont:font constrainedToSize:CGSizeMake(lblWidth,MAXFLOAT) lineBreakMode:aLabel.lineBreakMode].height;

    TRC_DBG(@"Label Height %f Constraint height %f", lblHeight, height);
    //Reduce font size while too large, break if no height (empty string)
    while (height > lblHeight && height != 0) {
        fontSize--;
        newFont = [UIFont fontWithName:font.fontName size:fontSize];
        height = [aLabel.text sizeWithFont:newFont constrainedToSize:CGSizeMake(lblWidth,MAXFLOAT) lineBreakMode:NSLineBreakByWordWrapping].height;
        TRC_DBG(@"Constrained Height %f", height);
    };


    TRC_DBG(@"Font size before adjustment %f", aLabel.font.pointSize);
    // Set the UILabel's font to the newly adjusted font.
    aLabel.font = newFont;
    TRC_DBG(@"Adjust to font size of %f", newFont.pointSize);
    [aLabel setNeedsLayout];
}

Answer 2

在故事板中，单击“调整”以适合并选择最小尺寸。

iOS：根据UILabel的大小找到适合UILabel的正确字体大小

2 个答案: