點擊我的UIButton后iOS應用程序崩潰了

Question

摘要

這是我試圖用Xamarin制作的第一個應用程序。 我正在學習Hello World, iPhone例子。 當我點擊我的按鈕時，應用程序崩潰，我無法弄清楚原因。

細節

我有一個簡單的UIViewController和一個UIButton 。 我創建了一個插座，所以當我點擊按鈕時，我會做一些事情。

當我連接按鈕的TouchUpInside event ，當我點擊按鈕時應用程序崩潰。 當我刪除有線連接事件（但插座仍然存在）時，單擊按鈕時應用程序不會崩潰。 （當然，沒有任何事情發生，因為沒有任何連線）。

讓我感到沮喪的是，我不知道出了什么問題並且使用了調試信息，我無法弄明白！ 我多年來一直在做C＃代碼，但剛開始使用Xam有點不同，特別是當崩潰報告缺少任何信息時。 我猜我可能會勾選一些設置（例如沒有調試信息？）

所以這里有一些代碼......

AuthenticationViewController
.h文件

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>


@interface AuthenticationViewController : UIViewController {
UIButton *_Google;
}

@property (nonatomic, retain) IBOutlet UIButton *Google;

@end

.m文件

#import "AuthenticationViewController.h"

@implementation AuthenticationViewController

@synthesize Google = _Google;

@end

設計師檔案

using MonoTouch.Foundation;
using System.CodeDom.Compiler;

namespace Foo.Client.iPhone
{

    [Register ("AuthenticationViewController")]
    partial class AuthenticationViewController
    {
        [Outlet]
        MonoTouch.UIKit.UIButton Google { get; set; }

        void ReleaseDesignerOutlets ()
        {
            if (Google != null) {
                Google.Dispose ();
                Google = null;
            }
        }
    }
}

最后，我的

.cs文件

using System;
using System.Drawing;
using MonoTouch.Foundation;
using MonoTouch.UIKit;

namespace Foo.Client.iPhone
{
    public partial class AuthenticationViewController : UIViewController
    {
        public int xxx = 0;
        public event EventHandler OnAuthenticationCompleted;

        public AuthenticationViewController() 
            : base ("AuthenticationViewController", null)
        {
        }

        public override void DidReceiveMemoryWarning()
        {
            // Releases the view if it doesn't have a superview.
            base.DidReceiveMemoryWarning();

            // Release any cached data, images, etc that aren't in use.
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            Google.TouchUpInside += (sender, e) => 
            {
                xxx++;
            };
        }
    }
}

這是（缺少）崩潰轉儲/堆棧跟蹤

2013-10-25 21:37:13.785 FooClientiPhone[8852:1403] MonoTouch: Socket error while connecting to MonoDevelop on 127.0.0.1:10000: Connection refused
mono-rt: Stacktrace:

mono-rt:   at <unknown> <0xffffffff>

mono-rt:   at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <IL 0x0009f, 0xffffffff>

mono-rt:   at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38

mono-rt:   at Foo.Client.iPhone.Application.Main (string[]) [0x00008] in /Users/PureKrome/Documents/Mac Projects/Foo iOS Client/Code/Foo.Client.iPhone/Main.cs:16

mono-rt:   at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>

mono-rt: 
    Native stacktrace:

 mono-rt: 
    =================================================================
    Got a SIGSEGV while executing native code. This usually indicates
        a fatal error in the mono runtime or one of the native libraries 
            used by your application.
            =================================================================

我被困住了，不知道怎么繼續？

此外， 這是一個顯示錯誤的視頻 （請選擇720p版本）。

這是解決方案，拉鏈 。

Answer 1

從xCode的角度來看，我認為IBOutlet導致應用程序崩潰。 僅僅因為IBOutlets用於狀態而不是用於調用方法。 在這種情況下，您應該將按鈕連接到IBAction：

- (IBAction)Google:(id)sender; 

最終將致電：

Google.TouchUpInside += (sender, e) => 
            {
                xxx++;
            };

另請注意，在現代objective-c中，您不需要@synthesize Google = _Google; 這將自動發生。

happy x（amarin）編碼。

Answer 2

你為一個簡單的hello世界編寫了很多代碼

這是你不需要的

@property (nonatomic, retain) IBOutlet UIButton *Google;
@synthesize Google = _Google;

using  MonoTouch . Foundation ; 
using  System . CodeDom . Compiler ; 

namespace  Foo . Client . iPhone
{ 

[ Register  ( "AuthenticationViewController" )] 
partial  class  AuthenticationViewController 
{ 
    [ Outlet ] 
    MonoTouch . UIKit . UIButton  Google  {  get ;  set ;  } 

    void  ReleaseDesignerOutlets  () 
    { 
        if  ( Google  !=  null )  { 
            Google . Dispose  (); 
            Google  =  null ; 
        } 
       } 
    } 
   }
  using System;
  using System.Drawing;
  using MonoTouch.Foundation;
  using MonoTouch.UIKit;

  namespace Foo.Client.iPhone
 {
 public partial class AuthenticationViewController : UIViewController
 {
    public int xxx = 0;
    public event EventHandler OnAuthenticationCompleted;

    public AuthenticationViewController() 
        : base ("AuthenticationViewController", null)
    {
    }

    public override void DidReceiveMemoryWarning()
    {
        // Releases the view if it doesn't have a superview.
        base.DidReceiveMemoryWarning();

        // Release any cached data, images, etc that aren't in use.
    }

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        Google.TouchUpInside += (sender, e) => 
        {
            xxx++;
        };
    }
   }
   } 2013-10-25 21:37:13.785 FooClientiPhone[8852:1403] MonoTouch: Socket error while           connecting to MonoDevelop on 127.0.0.1:10000: Connection refused
    mono-rt: Stacktrace:

   mono-rt:   at <unknown> <0xffffffff>

  mono-rt:   at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain         (int,string[],intptr,intptr) <IL 0x0009f, 0xffffffff>

  mono-rt:   at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38

  mono-rt:   at Foo.Client.iPhone.Application.Main (string[]) [0x00008] in /Users/PureKrome/Documents/Mac Projects/Foo iOS Client/Code/Foo.Client.iPhone/Main.cs:16

mono-rt:   at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object          (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>

   mono-rt: 
   Native stacktrace:
  mono-rt: 
   =================================================================
    Got a SIGSEGV while executing native code. This usually indicates
    a fatal error in the mono runtime or one of the native libraries 
        used by your application.
        =================================================================

所以如果你用一個按鈕打造一個hello world不需要任何這個

要打個招呼世界，只需要這個

@interface ViewController ()


@property (nonatomic, strong) UILabel *myLabel;



@implementation ViewController

- (IBAction)myButton:(id)sender 
{ 
  _myLabel.Text = @"Hello World ";
}
@end

Answer 3

這告訴我們也許我們失去了對某事的參考。 我知道有人已經說過要啟用僵屍了，但這可能不是你的包裝器/編譯器的一個選項。

mono-rt:   at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>

嘗試更換：

@interface AuthenticationViewController : UIViewController {
    UIButton *_Google; 
}

@property (nonatomic, retain) IBOutlet UIButton *Google;

只需：

@interface AuthenticationViewController : UIViewController 
@property (nonatomic, retain) IBOutlet UIButton *Google;

當您單擊該按鈕時，編譯器可能不知道您在說什么。