iOS 根据字符串计算label高度

最新推荐文章于 2024-05-10 10:19:31 发布

原创最新推荐文章于 2024-05-10 10:19:31 发布 · 6.6k 阅读

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#iOS #自适应高度 #label #字符串

直接上代码

tipLabel = [[UILabel alloc] init];
    [self.backScrollView addSubview:tipLabel];
    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
    [style setLineSpacing:10];
    NSString *tipStr = @"温馨提示：这是要计算高度的字符串";
    NSDictionary *dic = @{NSFontAttributeName:kSystemFont_16, NSParagraphStyleAttributeName:style};
    NSAttributedString *attributeStr = [[NSAttributedString alloc] initWithString:tipStr attributes:dic];
    tipLabel.attributedText = attributeStr;
    tipLabel.numberOfLines = 0;
    CGFloat height = [self getHeightLineWithString:tipStr withWidth:kDeviceWidth - 20 withFont:kSystemFont_16];
    tipLabel.frame = CGRectMake(10, topHeight + 300, kDeviceWidth - 20, height);

#pragma mark - 根据字符串计算label高度
- (CGFloat)getHeightLineWithString:(NSString *)string withWidth:(CGFloat)width withFont:(UIFont *)font {
    
    //1.1最大允许绘制的文本范围
    CGSize size = CGSizeMake(width, 2000);
    //1.2配置计算时的行截取方法,和contentLabel对应
    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
    [style setLineSpacing:10];
    //1.3配置计算时的字体的大小
    //1.4配置属性字典
    NSDictionary *dic = @{NSFontAttributeName:font, NSParagraphStyleAttributeName:style};
    //2.计算
    //如果想保留多个枚举值,则枚举值中间加按位或|即可,并不是所有的枚举类型都可以按位或,只有枚举值的赋值中有左移运算符时才可以
    CGFloat height = [string boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:dic context:nil].size.height;
    
    return height;
}