UILabel 根据内容的多少来计算label的frame

最新推荐文章于 2022-02-09 17:59:38 发布

转载最新推荐文章于 2022-02-09 17:59:38 发布 · 120 阅读

本文介绍了计算标签框的最新方法，包括设置标签最大显示行数、定义字体大小和根据显示区域限制求出标签框尺寸的过程。通过示例代码演示了如何实现这一功能。

self.label.text = @"....";

计算 frame 的最新方法

//1.设置lable最大显示行数

self.label.numberOfLines = 0;

//2.写出字体的字号

NSDictionary *attrs = @{NSFontAttributeName : [UIFont systemFontOfSize:15]};

//3.根据显示区域的限制（如CGSizeMake(375.0, 40.0)）求出一个框架的size

CGRect rect = [self.label.text boundingRectWithSize:CGSizeMake(375.0, 40.0) options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil];

例如

NSDictionary *attrs = @{NSFontAttributeName :[UIFont systemFontOfSize:15]};

CGRect rect = [@"..." boundingRectWithSize:CGSizeMake(MAXFLOAT, 20) options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil];

附上函数抽取

-(void)calculateFrameOfLabel:(UILabel *)lab andAddValue:(CGFloat)value{

lab.numberOfLines = 0;

lab.font = kFontSize_24;

NSDictionary * attributes = [NSDictionary dictionaryWithObject:lab.font forKey:NSFontAttributeName];

CGRect rect = [lab.text boundingRectWithSize:CGSizeMake(kScreenWidth - 12-12, 1000) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil];

lab.frame = CGRectMake(12, value, kScreenWidth - 24, rect.size.height);

}

有人说这么写

+ (CGSize )viewHeight:(CGSize )withd  :(float)thfont :(NSString*)text
{
    CGSize size;
    if(IOS_7>=7.0)
    {
        NSDictionary * attributes = [NSDictionary dictionaryWithObject:[UIFont systemFontOfSize:thfont]forKey:NSFontAttributeName];
        NSAttributedString *attributedText =[[NSAttributedString alloc]initWithString:text attributes:attributes];
        CGRect rect = [attributedText boundingRectWithSize:withd
                                                  options:NSStringDrawingUsesLineFragmentOrigin
                                                   context:nil];
        size = rect.size;
    }
    else
    {
        //设置label的最大行数
        size = [text sizeWithFont:[UIFont systemFontOfSize:thfont]constrainedToSize:withd lineBreakMode:NSLineBreakByClipping];
    }
    return size;

}