错误“线程1：EXC_BAD_INSTRUCTION（代码= EXC_I386_INVOP，子代码= 0x0）”是什么意思？ [英] what does Error "Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)" mean?

问题描述

我收到此错误：

主题1：EXC_BAD_INSTRUCTION（代码= EXC_I386_INVOP，子代码= 0x0）

Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)

我该如何解决这个问题？代码工作正常，但在计算器中，当我单击唯一的相等按钮时，它会给出错误。

How can I solve this? The code works normally, but in the calculator when I click the only equal button, it gives that error.

@IBAction func equals(sender: AnyObject) {

    secondNumber = Screen.text!.toInt()!  // here it shows an error which is "Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)"

    if operation == "+"{
        result = firstNumber + secondNumber
    }
    else if operation == "-" {
        result = firstNumber - secondNumber
    }
    else if operation == "x" {
        result = firstNumber * secondNumber
    }
    else {
        result = firstNumber / secondNumber
    }
    Screen.text = "\(result)"
}

推荐答案

此行

secondNumber = Screen.text!.toInt()!

表示：获取Screen对象，获取text属性，如果不存在则请崩溃，然后将文本转换为整数，如果它不存在请崩溃。

means: Get the Screen object, get the text property and please crash if it doesn't exist, then get the text converted to an integer, and please crash if it doesn't exist.

这就是！意思是：它意味着我确定这个东西存在，所以如果不存在则请崩溃。这就是它的作用。

That's what the ! means: It means "I am sure this thing exists, so please crash if it doesn't". And that's what it did.

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