Question

如何知道此textView中文本的高度？

lazy var textView: UITextView = {
    let tv = UITextView()
    tv.textColor = .white
    tv.translatesAutoresizingMaskIntoConstraints = false
    tv.isEditable = false
    tv.backgroundColor = .white
    tv.text = "Se non vuoi vedere di nuovo questa presentazione clicca sul bottone qui sotto..."
    tv.textAlignment = .center
    tv.font = UIFont(name: "Avenir-Light", size: 22)
    return tv
}()

Answer 1

您可以像下面这样计算文字高度：

let sizeThatFitsTextView = textView.sizeThatFits(CGSize(width: textView.frame.size.width, height: CGFloat(MAXFLOAT)))
let heightOfText = sizeThatFitsTextView.height

Answer 2

在我的情况下，我正在计算标签的高度

void ConnectToServer()
{
    //... your code

    int connectResult = ::connect(sock, (struct sockaddr *)&server, sizeof(server));
    if (connectResult >= 0)
    {
        u_long iMode = 1;
        int iResult = ioctlsocket(sock, FIONBIO, &iMode); //Set the socket Non-Blocking

        printf("Connected to server!\n");
    }
    else
    {
        printf("Not connected to server. Err: %d\n", connectResult);
    }
}

int main(){
    Connect(); //function to connect with a WiFi network
    ConnectToServer();

    unsigned long lastSendTime = 0;
    unsigned long sendInterval = 200; //send a message every 200 milliseconds
    unsigned int nMsgSent = 0;


    fd_set write_fd;

    while (1){
        unsigned long now = milliseconds(); //function to get the time in milliseconds
        if ((now - lastSendTime) > sendInterval){
            std::string request = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
            request += request;
            request += std::to_string(nMsgSent);
            request += "\n";

            FD_ZERO(&write_fd); //Reset the File Descriptor
            FD_SET(sock, &write_fd); //Set se File descriptor to the socket.

            int result = select(max_sd, NULL, &write_fd, NULL, NULL);   //Wait until the socket is ready to write

            if (result < 0)
            {
                iprintf("There was a problem with the sockets reading.\n");
                FD_ZERO(&write_fd);
            }

            int sendResult = ::send(sock, request.c_str(), request.length(), 0);
            iprintf("req(%d): %d\n", nMsgSent, sendResult);

            nMsgSent++;
            lastSendTime = now;
        }
    }
    return 0;
}

Answer 3

我发现了这个......在我的情况下它起作用了：

func returnStringWidth(font: UIFont, text: String) -> CGSize {
    let fontAttributes = [NSFontAttributeName: font]
    let size = (text as NSString).size(attributes: fontAttributes)

    return size
}

如何计算UITextView中文本的高度？

3 个答案: