尝试在每次属性字符串超过一定高度时创建新的NSTextView？

class MyTextViewDelegate: NSObject, NSTextViewDelegate {
    let maxHeight: CGFloat = 200 // 设置最大高度
    
    func textDidChange(_ notification: Notification) {
        guard let textView = notification.object as? NSTextView else {
            return
        }
        
        let textHeight = textView.layoutManager?.usedRect(for: textView.textContainer!).height ?? 0
        
        if textHeight > maxHeight {
            let newTextView = NSTextView(frame: textView.frame)
            newTextView.string = textView.string
            
            // 添加新的NSTextView到合适的位置
            // ...
        }
    }
}

// 在使用NSTextView的地方设置代理
let textView = NSTextView(frame: CGRect(x: 0, y: 0, width: 200, height: 100))
textView.delegate = MyTextViewDelegate()