App crashes after Monotouch update to 5.2.13 - ios

Question

After I have updated monotouch to Version 5.2.13 my App crashes when I touched inside a UIButton.
About my Code: (it's a question of a LoginView):
I have a UIViewController which includes a ScrollView.
For each User the ScrollView provides a UIView (the UserImageView).
This UserImageView contains a UserImage, Username and so on. Over the UserImage lays a UIButton which should catches the Touch-Events to selected a User.
This Button causes the Exception below more precisely the HitTest method from the UIView.
I get the following Stacktrace:
Stacktrace:
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <IL 0x0009f, 0xffffffff>
at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x00042] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:29
at MF.Stationaer.iPad.Application.Main (string[]) <IL 0x00028, 0x00073>
at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>
Native stacktrace:
0 MFiPad_MD 0x0009061c mono_handle_native_sigsegv + 284
1 MFiPad_MD 0x000059a8 mono_sigsegv_signal_handler + 248
2 libsystem_c.dylib 0x92cd259b _sigtramp + 43
3 ??? 0xffffffff 0x0 + 4294967295
4 UIKit 0x0228c741 __38-[UIView(Geometry) hitTest:withEvent:]_block_invoke_0 + 96
5 CoreFoundation 0x0116cf1a __NSArrayChunkIterate + 362
6 CoreFoundation 0x01138635 __NSArrayEnumerate + 997
7 CoreFoundation 0x01138026 -[NSArray enumerateObjectsWithOptions:usingBlock:] + 102
8 UIKit 0x0228c66b -[UIView(Geometry) hitTest:withEvent:] + 646
9 UIKit 0x0228c765 __38-[UIView(Geometry) hitTest:withEvent:]_block_invoke_0 + 132
10 CoreFoundation 0x0116cf1a __NSArrayChunkIterate + 362
11 CoreFoundation 0x01138635 __NSArrayEnumerate + 997
12 CoreFoundation 0x01138026 -[NSArray enumerateObjectsWithOptions:usingBlock:] + 102
13 UIKit 0x0228c66b -[UIView(Geometry) hitTest:withEvent:] + 646
14 UIKit 0x022a1157 -[UIScrollView hitTest:withEvent:] + 79
15 UIKit 0x0228c765 __38-[UIView(Geometry) hitTest:withEvent:]_block_invoke_0 + 132
16 CoreFoundation 0x0116cf1a __NSArrayChunkIterate + 362
17 CoreFoundation 0x01138635 __NSArrayEnumerate + 997
18 CoreFoundation 0x01138026 -[NSArray enumerateObjectsWithOptions:usingBlock:] + 102
19 UIKit 0x0228c66b -[UIView(Geometry) hitTest:withEvent:] + 646
20 UIKit 0x0228c765 __38-[UIView(Geometry) hitTest:withEvent:]_block_invoke_0 + 132
21 CoreFoundation 0x0116cf1a __NSArrayChunkIterate + 362
22 CoreFoundation 0x01138635 __NSArrayEnumerate + 997
23 CoreFoundation 0x01138026 -[NSArray enumerateObjectsWithOptions:usingBlock:] + 102
24 UIKit 0x0228c66b -[UIView(Geometry) hitTest:withEvent:] + 646
25 UIKit 0x0228c765 __38-[UIView(Geometry) hitTest:withEvent:]_block_invoke_0 + 132
26 CoreFoundation 0x0116cf1a __NSArrayChunkIterate + 362
27 CoreFoundation 0x01138635 __NSArrayEnumerate + 997
28 CoreFoundation 0x01138026 -[NSArray enumerateObjectsWithOptions:usingBlock:] + 102
29 UIKit 0x0228c66b -[UIView(Geometry) hitTest:withEvent:] + 646
30 UIKit 0x02286dbd +[UIWindow _hitTestToPoint:pathIndex:forEvent:] + 378
31 UIKit 0x02258ca0 _UIApplicationHandleEvent + 1648
32 GraphicsServices 0x047c5ef5 PurpleEventCallback + 1274
33 CoreFoundation 0x011a9195 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
34 CoreFoundation 0x0110dff2 __CFRunLoopDoSource1 + 146
35 CoreFoundation 0x0110c8da __CFRunLoopRun + 2218
36 CoreFoundation 0x0110bd84 CFRunLoopRunSpecific + 212
37 CoreFoundation 0x0110bc9b CFRunLoopRunInMode + 123
38 GraphicsServices 0x047c47d8 GSEventRunModal + 190
39 GraphicsServices 0x047c488a GSEventRun + 103
40 UIKit 0x02258626 UIApplicationMain + 1163
41 ??? 0x0b96e514 0x0 + 194438420
42 ??? 0x0b96d6c0 0x0 + 194434752
43 ??? 0x0b96d33c 0x0 + 194433852
44 ??? 0x0b96d42f 0x0 + 194434095
45 MFiPad_MD 0x00009d12 mono_jit_runtime_invoke + 722
46 MFiPad_MD 0x00169e4e mono_runtime_invoke + 126
47 MFiPad_MD 0x0016df34 mono_runtime_exec_main + 420
48 MFiPad_MD 0x001732e5 mono_runtime_run_main + 725
49 MFiPad_MD 0x00066f15 mono_jit_exec + 149
50 MFiPad_MD 0x002115d5 main + 2837
51 MFiPad_MD 0x00002d65 start + 53
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.
Here is the important Part of my Code:
public class LoginViewController : UIViewController
{
...
public override void ViewDidLoad()
{
...
BuildUserUI();
...
}
private void BuildUserUI()
{
currentIconLocation = new PointF(50, 10);
for (var i = 0; i < UserList.List.Count; i++)
CreateUserInGrid(UserList.GetUserByIndex(i));
}
private void CreateUserInGrid(LoginUser user)
{
var imgFrame = new RectangleF(currentIconLocation.X, currentIconLocation.Y, 140, 170);
var loginImg = new UILoginImage(imgFrame);
loginImg.Image = user.Image ?? defaultUserImage.CGImage;
loginImg.Name = user.Nachname;
if (!string.IsNullOrEmpty(user.Vorname))
loginImg.Name += ", " + user.Vorname;
loginImg.Tag = user.UserIndex;
loginImg.AddTarget(this, new Selector("ShowNumberPad:"), UIControlEvent.TouchUpInside);
loginImg.LoginUser = user;
scrollView.AddSubview(loginImg);
loginImages.Add(loginImg);
limitedScrollView.UserInteractionEnabled = false;
var newSize = new SizeF(scrollView.Frame.Size.Width, currentIconLocation.Y + imgFrame.Size.Height + 20);
scrollView.ContentSize = newSize;
limitedScrollView.ContentSize = new SizeF(limitedScrollView.Frame.Size.Width, limitedScrollView.Frame.Size.Height);
currentIconLocation.X += imgFrame.Size.Width;
if (currentIconLocation.X + imgFrame.Size.Width > scrollView.Frame.Size.Width)
{
currentIconLocation.Y += imgFrame.Size.Height;
currentIconLocation.X = 50;
}
}
[Export("ShowNumberPad:")]
private void ShowNumberPad(NSObject sender)
{
...
}
}
public class UILoginImage : UIView
{
[Export("initWithFrame:")]
public UILoginImage(RectangleF frame)
: base(frame)
{
var shadowFrame = new RectangleF(0, 0, 117, 148);
wrapperControl = new UIControl(shadowFrame);
AddSubview(wrapperControl);
shadowImage = new UIImageView(shadowFrame);
shadowImage.Image = ImageCache.GetResourceImage("Images/Login/LoginSchatten.png");
wrapperControl.AddSubview(shadowImage);
var mainBackFrame = new RectangleF(8, 9, 98, 128);
whiteBackgroundImage = new UIImageView(mainBackFrame);
whiteBackgroundImage.Image = ImageCache.GetResourceImage("Images/Login/Singlewhite.png");
wrapperControl.AddSubview(whiteBackgroundImage);
var imageFrame = new RectangleF(13, 15, 87, 116);
clickHelper = UIButton.FromType(UIButtonType.Custom);
clickHelper.Frame = imageFrame;
wrapperControl.AddSubview(clickHelper);
userImage = new UIImageView(imageFrame);
AddSubview(userImage);
var mitarbeiterlabelFrame = new RectangleF(-12, 137, 140, 25);
mitarbeiterNameLabel = new FontSizeLabel(mitarbeiterlabelFrame);
mitarbeiterNameLabel.TextAlignment = UITextAlignment.Center;
mitarbeiterNameLabel.Font = UIFont.SystemFontOfSize(12);
mitarbeiterNameLabel.Opaque = false;
mitarbeiterNameLabel.BackgroundColor = UIColor.Clear;
AddSubview(mitarbeiterNameLabel);
var benutzerlabelFrame = new RectangleF(mitarbeiterlabelFrame.X, mitarbeiterlabelFrame.Y + 13, 140, 25);
benutzerNameLabel = new FontSizeLabel(benutzerlabelFrame);
benutzerNameLabel.TextAlignment = UITextAlignment.Center;
benutzerNameLabel.Font = UIFont.SystemFontOfSize(10);
benutzerNameLabel.Opaque = false;
benutzerNameLabel.BackgroundColor = UIColor.Clear;
benutzerNameLabel.TextColor = UIColor.DarkGray;
AddSubview(benutzerNameLabel);
}
public void AddTarget(NSObject target, Selector action, UIControlEvent controlEvents)
{
clickHelper.AddTarget(target, action, controlEvents);
}
public void RemoveTarget(NSObject target, Selector action, UIControlEvent controlEvents)
{
clickHelper.RemoveTarget(target, action, controlEvents);
}
}

Answer 1

I'm not sure your use of AddTarget is a good way to hook up a UIButton's click.
You should be using clickHelper.TouchUpInside to wire up click events. This is a standard C# event.
Another option would be to wire up an action to this event inside your XIB file in XCode.