ios - Xcode 中的应用程序崩溃

Question

我是一名高中生，正在为学校项目创建一个简单的应用程序。这是我第一次使用 Swift 语言和 Xcode 创建应用程序。
每次我运行该应用程序时，它都会在打开之前崩溃。这是崩溃后显示的内容:



这是代码:

import UIKit
import Foundation

class ViewController: UIViewController {

    @IBOutlet weak var coffeeOutput: UILabel!
    @IBOutlet weak var check1: UILabel!
    let things = UserDefaults.standard

    var coffeeShops = [0,0,0,0,0,0,0,0,0]

    // 0 days: Int = 0
    // 1 highland: Int = 0
    // 2 starbucks: Int = 0
    // 3 heine: Int = 0
    // 4 quills: Int = 0
    // 5 bean: Int = 0
    // 6 sunergos: Int = 0
    // 7 press: Int = 0
    // 8 please: Int = 0



    override func viewDidLoad() {
        super.viewDidLoad()
    }

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

    @IBAction func highlands(sender: UIButton) {
        things.set(things.integer(forKey: "highland")+1, forKey: "highland" )
        things.set(things.integer(forKey: "days")+1, forKey: "days" )
        things.synchronize()
   }

    @IBAction func downtown(_:AnyObject) {

        things.set(things.integer(forKey: "please")+1, forKey: "please" )
        things.set(things.integer(forKey: "starbucks")+1, forKey: "starbucks" )
        things.set(things.integer(forKey: "press")+1, forKey: "press" )
        things.synchronize()
    }

    @IBAction func germantown(_:AnyObject) {
        things.set(things.integer(forKey: "heine")+1, forKey: "heine" )
        things.set(things.integer(forKey: "bean")+1, forKey: "bean" )
        things.set(things.integer(forKey: "sunergos")+1, forKey: "sunergos" )
        things.synchronize()
    }

    @IBAction func school(_:AnyObject) {
        things.set(things.integer(forKey: "quills")+1, forKey: "quills" )
        things.synchronize()
    }

    @IBAction func homework(_:AnyObject) {

        things.set(things.integer(forKey: "days")+1, forKey: "days" )
        things.set(things.integer(forKey: "starbucks")+1, forKey: "starbucks" )
        things.set(things.integer(forKey: "heine")+1, forKey: "heine" )
        things.set(things.integer(forKey: "quills")+1, forKey: "quills" )
        things.set(things.integer(forKey: "sunergos")+1, forKey: "sunergos" )
        things.synchronize()
    }

    @IBAction func meeting(_:AnyObject) {

        things.set(things.integer(forKey: "days")+1, forKey: "days" )
        things.set(things.integer(forKey: "starbucks")+1, forKey: "starbucks" )
        things.set(things.integer(forKey: "heine")+1, forKey: "heine" )
        things.set(things.integer(forKey: "quills")+1, forKey: "quills" )
        things.set(things.integer(forKey: "bean")+1, forKey: "bean" )
        things.set(things.integer(forKey: "press")+1, forKey: "press" )
        things.synchronize()
    }

    @IBAction func toGo(_:AnyObject) {

        things.set(things.integer(forKey: "starbucks")+1, forKey: "starbucks" )
        things.set(things.integer(forKey: "heine")+1, forKey: "heine" )
        things.set(things.integer(forKey: "bean")+1, forKey: "bean" )
        things.set(things.integer(forKey: "sunergos")+1, forKey: "sunergos" )
        things.set(things.integer(forKey: "please")+1, forKey: "please" )
        things.synchronize()
    }

    @IBAction func hang(_:AnyObject) {

        things.set(things.integer(forKey: "highland")+1, forKey: "highland" )
        things.set(things.integer(forKey: "days")+1, forKey: "days" )
        things.set(things.integer(forKey: "heine")+1, forKey: "heine" )
        things.synchronize()

    }

    @IBAction func morning(_:AnyObject) {

        things.set(things.integer(forKey: "days")+1, forKey: "days" )
        things.set(things.integer(forKey: "starbucks")+1, forKey: "starbucks" )
        things.set(things.integer(forKey: "heine")+1, forKey: "heine" )
        things.set(things.integer(forKey: "bean")+1, forKey: "bean" )
        things.set(things.integer(forKey: "sunergos")+1, forKey: "sunergos" )
        things.set(things.integer(forKey: "press")+1, forKey: "press" )
        things.synchronize()
    }

    @IBAction func midday(_:AnyObject) {
        //0 2 3 4 6 7 8
        things.set(things.integer(forKey: "days")+1, forKey: "days" )
        things.set(things.integer(forKey: "starbucks")+1, forKey: "starbucks" )
        things.set(things.integer(forKey: "heine")+1, forKey: "heine" )
        things.set(things.integer(forKey: "quills")+1, forKey: "quills" )
        things.set(things.integer(forKey: "sunergos")+1, forKey: "sunergos" )
        things.set(things.integer(forKey: "press")+1, forKey: "press" )
        things.set(things.integer(forKey: "please")+1, forKey: "please" )
        things.synchronize()
    }

    @IBAction func night(_:AnyObject) {
        things.set(things.integer(forKey: "days")+1, forKey: "days" )
        things.set(things.integer(forKey: "highland")+1, forKey: "highland" )
        things.set(things.integer(forKey: "heine")+1, forKey: "heine" )
        things.synchronize()
    }

    // 0 days: Int = 0
    // 1 highland: Int = 0
    // 2 starbucks: Int = 0
    // 3 heine: Int = 0
    // 4 quills: Int = 0
    // 5 bean: Int = 0
    // 6 sunergos: Int = 0
    // 7 press: Int = 0
    // 8 please: Int = 0

    @IBAction func computeShop(_:AnyObject) {
        var max = things.integer(forKey: "days")
        var maxKey = "days"
        for element in UserDefaults.standard.dictionaryRepresentation().keys.elements{
            if(things.integer(forKey: element)>max){
                max = things.integer(forKey: element)
                maxKey = element
            }
        }
        self.coffeeOutput.text = maxKey

        for element in UserDefaults.standard.dictionaryRepresentation().keys.elements{
            things.set(0,forKey: element)
            things.synchronize()
        }


    }
}

这是堆栈跟踪:
{

2017-04-13 12:13:04.411 按钮[95215:59212987]-[ NSCFNumber _getCString:maxLength:encoding:]:无法识别的选择器发送到实例 0xb000000000000003
2017-04-13 12:13:04.574 按钮 [95215:59212987] *** 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因:“-[__NSCFNumber _getCString:maxLength:encoding:]:无法识别的选择器发送到实例 0xb000000000000003”
*** 首先抛出调用堆栈:
(
0 核心基础 0x000000010b4f4d4b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010af5621e objc_exception_throw + 48
2核心基础0x000000010b564f04-[NSObject(NSObject)不识别选择器:]+132
3 核心基础 0x000000010b47a005 ___forwarding_ + 1013
4 核心基础 0x000000010b479b88 _CF_forwarding_prep_0 + 120
5 核心基础 0x000000010b42e89b CFStringGetCString + 171
6 CoreFoundation 0x000000010b43e77d CFLocaleCreateCanonicalLocaleIdentifierFromString + 77
7 核心基础 0x000000010b43e327 _CFLocaleCopyCurrentGuts + 487
8 核心基础 0x000000010b43e109 +[NSLocale currentLocale] + 9
9 基础 0x000000010aa19376 -[NSUserDefaults(NSUserDefaults) 初始化] + 1637
10 基础 0x000000010aa18cb5 +[NSUserDefaults(NSUserDefaults)standardUserDefaults] + 81
11 UIKit 0x000000010b9438df ___UIApplicationMainPreparations_block_invoke_2 + 53
12 libdispatch.dylib 0x000000010eb7d978 _dispatch_call_block_and_release + 12
13 libdispatch.dylib 0x000000010eba70cd _dispatch_client_callout + 8
14 libdispatch.dylib 0x000000010eb8865f _dispatch_root_queue_drain + 1450
15 libdispatch.dylib 0x000000010eb88059 _dispatch_worker_thread3 + 123
16 libsystem_pthread.dylib 0x000000010ef56736 _pthread_wqthread + 1299
17 libsystem_pthread.dylib 0x000000010ef56211 start_wqthread + 13
)
libc++abi.dylib:以 NSException 类型的未捕获异常终止
(lldb)
}

知道问题是什么吗？

Answer 1

检查您的 xib 文件的文件所有者

检查与 View Controller 的连接(导出和操作)

修复这些后，清理构建(cmd + shift + k)并重新运行它。

如果它仍然崩溃，
在所有类中设置断点，并找出它崩溃的确切位置。请给我们一些额外的信息，我们会尽力帮助更多

注意:同步不是必需的