ios - UIViewController 上的多个 UILabel

Question

我正在尝试控制将两个 UILabel 拖放到 UIViewController 上。我不断收到 Cannot override strong property with weak property 错误。

这是我的代码的一小段摘录。这是所有错误的屏幕截图https://gyazo.com/bd97fa42443d12a3aa17a2de55f78b60

import UIKit

class ViewController: UIViewController {


@IBOutlet private weak var display: UILabel!

@IBOutlet private weak var description: UILabel!

private var userIsInTheMiddleOfTyping = false

@IBAction private func touchDigit(_ sender: UIButton) {
    let digit = sender.currentTitle!
    if (digit == "c") {
        display.text = " "
    } else {
        print("touchDigit \(digit) digit")
        if userIsInTheMiddleOfTyping {
            let textCurrentlyInDisplay = display.text
            if (sender.currentTitle!) == "c" {
                print("it printed c")
                display.text = "sam"

Answer 1

您需要重命名您的 description 变量，因为 description 是从 NSObject 继承的方法的名称( 的基类UIViewController).