什么是错误“线程 1:EXC_BAD_INSTRUCTION(代码=EXC_I386_INVOP，子代码=0x0)"?意思是? [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:

线程 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?代码正常工作，但在计算器中，当我单击唯一的相等按钮时，它给出了该错误.

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()!

意思是:获取Screen对象，获取text属性，如果不存在请崩溃，然后将文本转换为整数，如果不存在请崩溃.

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 ! 的意思:我确信这个东西存在，所以如果它不存在，请崩溃".崩溃就是它所做的.

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

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