计算字符串的宽度和高度

最新推荐文章于 2020-12-03 04:42:37 发布

Andney01

最新推荐文章于 2020-12-03 04:42:37 发布

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分类专栏： IOS基础知识文章标签：字符串的高度字符串的宽度

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计算字体的高度：

//根据字体的字号来计算字体的高度
float fontHeight(float fontNumber)
{
    CGRect rect = [@"字" boundingRectWithSize:CGSizeMake(100, 100) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:fontNumber]} context:nil];
    return ceilf(rect.size.height);
}

计算字体的宽度

//根据字号来计算字体的宽度
float fontWidth(CGFloat fontNumber)
{
    CGRect rect = [@"字" boundingRectWithSize:CGSizeMake(100, 100) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:fontNumber]} context:nil];
    return ceilf(rect.size.width);
}

计算字符串的高度（不限制最大行数）

//计算字符串的高度
float stringHeight(CGFloat width, CGFloat fontNumber ,NSString *string)
{
	if (!string || string.length == 0)
    {
        return 0.0f;
    }
    CGRect rect = [string boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:fontNumber]} context:nil];
    return ceilf(rect.size.height)+1;
}

计算字符串的高度（限制最大行数）

//计算字符串的高度
float stringHeightWithMaxRow(CGFloat width, CGFloat fontNumber ,NSString *string ,int maxRow)
{
	if (!string || string.length == 0)
    {
        return 0.0f;
    }
    
    CGRect rect = [string boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:fontNumber]} context:nil];
    CGFloat height = ceilf(rect.size.height)+1;
    CGFloat maxHeight = maxRow * fontHeight(fontNumber);
    
    if(height > maxHeight)
    {
        height = maxRow * maxHeight;
    }
    return height;
}