Question

我是一名非常新手的程序员，我正在尝试创建一个Xcode应用程序，根据用户设置的参数为用户提供随机餐。我不知道我是否一开始就把它设置好了。目前它只是在检查它是否适用但是在我点击按钮＆＃34; selectRandomMealSelection＆＃34时已经获得EXC_BAD_ACCESS（Code = 2）错误的基础上，根据设置的参数更改标签的功能。 ;

我对任何批评都持开放态度，但请放轻松我，因为我只是在互联网上学习了大约一个月，但仍然不能100％确定这一切是如何运作的。感谢。

以下是代码：

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

init(attr0: Bool, attr1: Bool, attr2: Bool, attr3: Bool, attr4: Bool, attr5: Bool, randomMealCaseNumber: Int, cuisine: [String])
{
    self.attr0 = attr0
    self.attr1 = attr1
    self.attr2 = attr2
    self.attr3 = attr3
    self.attr4 = attr4
    self.attr5 = attr5
    self.randomMealCaseNumber = randomMealCaseNumber
    self.cuisine = cuisine

    super.init()
}


required init(coder aDecoder: NSCoder)
{
    super.init(coder: aDecoder)
}

var cuisine = ["Chinese", "Indian"]

@IBOutlet var healthSwitch: UISwitch!
@IBOutlet var easeSwitch: UISwitch!
@IBOutlet var timeSwitch: UISwitch!
@IBOutlet var costSwitch: UISwitch!

var attr0 = true            //Chinese
var attr1 = false           //Indian
var attr2 = false           //Health
var attr3 = false           //Ease
var attr4 = false           //Time Sensitivity
var attr5 = false           //Cost Sensitivity


@IBOutlet var mealNameLabel: UILabel!

@IBAction func healthIsRelevant(sender: UISwitch) {
    if healthSwitch.on == true{
        attr2 = true
    }
    else if healthSwitch.on == false {
        attr2 = false
    }
}

@IBAction func easeIsRelevant(sender: UISwitch) {
    if easeSwitch.on == true {
        attr3 = true
    }
    else if easeSwitch.on == false {
        attr3 = false
    }
}

@IBAction func timeIsRelevant(sender: UISwitch) {
    if timeSwitch.on == true {
        attr4 = true
    }
    else if timeSwitch.on == false {
        attr4 = false
    }
}

@IBAction func costIsRelevent(sender: UISwitch) {
    if costSwitch.on == true {
        attr5 = true
    }
    else if costSwitch.on == false {
        attr5 = false
    }
}

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int
{
    return 1
}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int
{
    return cuisine.count
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String
{
    return cuisine[row]
}

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
    var cuisineSelected = "\(cuisine[row])"

    if cuisineSelected == cuisine[0] {
        attr0 = true
        attr1 = false
    }
    else if cuisineSelected == cuisine[1] {
        attr0 = false
        attr1 = true
    }
}

let PorkChowMeinNoodles = (true, false, false, true, false, true)
func porkChowMeinNoodles (name: UILabel) {
    name.text = "Pork Chow Mein Noodles"
}
let ButterChicken = (false, true, false, false, false, false)
func butterChicken (name: UILabel) {
    name.text = "Butter Chicken"
}

var x = 0

var randomMealCaseNumber: Int = Int(arc4random() % 2)

@IBAction func selectRandomMealSelection(sender: UIButton) {
    randomMealSelection()


}

func randomMealSelection () {

    var randomMealCaseNumber: Int = Int(arc4random() % 2)

    switch (randomMealCaseNumber) {
    case 0:
        applicabilityTest(ButterChicken, a: attr0 ,b: attr1 ,c: attr2 ,d: attr3,e: attr4,f: attr5)
        if x == 1 {
            butterChicken(mealNameLabel)
        }
        else if x == 0 {
            randomMealSelection()
        }
    case 1:
        applicabilityTest(PorkChowMeinNoodles, a: attr0 ,b: attr1 ,c: attr2 ,d: attr3,e: attr4,f: attr5)
        if x == 1 {
            porkChowMeinNoodles(mealNameLabel)
        }
        else if x == 0 {
            randomMealSelection()
        }
    default:
        break;
    }
}

func applicabilityTest (meal: (Bool,Bool,Bool,Bool,Bool,Bool), a: Bool, b: Bool, c: Bool, d: Bool, e: Bool, f: Bool) {
    var a = attr0
    var b = attr1
    var c = attr2
    var d = attr3
    var e = attr4
    var f = attr5

    if meal.0 == a {
        if meal.1 == b {
            if meal.2 == c {
                if meal.3 == d {
                    if meal.4 == e {
                        if meal.5 == f {
                            x += 1
                        }
                        else
                        {x += 0}
                    }
                    else
                    {x += 0}
                }
                else
                {x += 0}
            }
            else
            {x += 0}
        }
        else
        {x += 0}
    }
    else
    {x += 0}
}

Answer 1

你的方法

init(attr0: Bool, attr1: Bool, attr2: Bool, attr3: Bool, attr4: Bool, attr5: Bool, randomMealCaseNumber: Int, cuisine: [String])

永远不会打电话给

。将此逻辑放在viewDidLoad方法中。 ViewController对象生命周期（init＆amp; dealloc）由UIKit控制。通常，不应将这些方法用于代码逻辑。

[编辑]

setupData(attr0: Bool, attr1: Bool, attr2: Bool, attr3: Bool, attr4: Bool, attr5: Bool, randomMealCaseNumber: Int, cuisine: [String])
{
    self.attr0 = attr0
    self.attr1 = attr1
    self.attr2 = attr2
    self.attr3 = attr3
    self.attr4 = attr4
    self.attr5 = attr5
    self.randomMealCaseNumber = randomMealCaseNumber
    self.cuisine = cuisine
}

然后从呈现此视图控制器的任何地方（在准备segue或setupData(....)）中调用presetViewController

Answer 2

在从内存中释放对象后调用对象时发生EXC_BAD_ACCESS（代码= 2）。在调用之前，请确保没有释放任何对象的内存。

我认为你的“attr0”可能会引发问题。

在你的viewdidload中，尝试在其他所有内容之前编写super.init（）。它应该工作。

我的EXC_BAD_ACCESS（Code = 2）错误的原因是什么？

2 个答案: