1.创建一个UITextView
_contentLab = [[UITextView alloc] initWithFrame:CGRectMake(60, 30, ScreenW-70, 20)];
_contentLab.font = [UIFont systemFontOfSize:14];
_contentLab.text = @"本当は とても とても 嬉しかったよ"; //这一步写入你的文本
[self.view addSubview:_contentLab];
2.把UITextView的编辑、滑动、边距全部关闭
_contentLab.editable = NO;
_contentLab.scrollEnabled = NO;
_contentLab.textContainer.lineFragmentPadding = 0;
_contentLab.textContainerInset = UIEdgeInsetsZero;
3.赋值你所建立的model的文本，计算高度并赋值
_contentLab.text = model.content;//赋值文本
NSMutableAttributedString * att =[[NSMutableAttributedString alloc] initWithString:_contentLab.text];
NSMutableParagraphStyle * para = [[NSMutableParagraphStyle alloc] init];
para.lineSpacing = 5;
[att addAttribute:NSParagraphStyleAttributeName value:para range:NSMakeRange(0, _contentLab.text.length)];
[att addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:14] range:NSMakeRange(0, _contentLab.text.length)];
_contentLab.attributedText = att;
CGFloat height = [att boundingRectWithSize:CGSizeMake(ScreenW - 70, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:nil].size.height;
_contentLab.height = height;
这时候点击会调用系统的方法，复制部分文字、或者全部复制
