[英]iOS (Monotouch) App Crashes on viewWillAppear
我有一个加载DialogViewController
的应用程序。 它包含几个元素。 元素之一是RootElement
。 此RootElement包含一个EntryElement
。
在viewDidAppear
,我从EntryElement
,并且entry元素中有一个值(即,我刚刚添加了该值),我想将该值用作视图中的标题。
视图是在父控制器中创建的:
public TabBarController ()
{
root = new RootElement("My Budget");
root.UnevenRows = true;
tab1 = new TestController(root);
nav = new UINavigationController(tab1);
nav.Title = "Budget";
var tabs = new UIViewController []{
nav
};
ViewControllers = tabs;
SelectedViewController = nav;
}
然后在控制器中-[应该]发生魔术
public override void ViewWillAppear (bool animated)
{
base.ViewWillAppear (animated);
var caption = "Value..";
if (BankElement != null && !String.IsNullOrWhiteSpace (BankElement.Value)){
caption = BankElement.Value;
}
MyRoot = new RootElement ("Root");
MyRoot.Caption = caption;
BankElement = new EntryElement("Enter", caption, "");
MyRoot.Add (new Section("") {BankElement});
rootelement = new RootElement("Root");
rootelement.Add (new Section("") {MyRoot});
Root = rootelement;
}
但是,当viewDidAppear
运行时,我可以进行堆栈跟踪。 我不是每次都得到它-只是偶尔。
堆栈跟踪:
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <IL 0x0009f, 0xffffffff>
at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38
at BudgetPlanner.Application.Main (string[]) [0x00000] in /Users/Ashley/github/local/BudgetPlanner/BudgetPlanner/Main.cs:18
at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>
本机堆栈跟踪:
0 BudgetPlanner 0x00095f7c mono_handle_native_sigsegv + 284
1 BudgetPlanner 0x0000be98 mono_sigsegv_signal_handler + 248
2 libsystem_c.dylib 0x908bd86b _sigtramp + 43
3 ??? 0xffffffff 0x0 + 4294967295
4 UIKit 0x028014d0 -[UITextField canResignFirstResponder] + 33
5 UIKit 0x0284761f -[UIResponder resignFirstResponder] + 82
6 UIKit 0x02801b36 -[UITextField resignFirstResponder] + 141
7 UIKit 0x0277f517 -[UIView(Hierarchy) _removeFirstResponderFromSubtree] + 209
8 UIKit 0x0277f873 __UIViewWillBeRemovedFromSuperview + 77
9 UIKit 0x0277f783 -[UIView(Hierarchy) removeFromSuperview] + 70
10 UIKit 0x029b73fe -[UINavigationTransitionView _cleanupTransition] + 103
11 UIKit 0x029b7698 -[UINavigationTransitionView _navigationTransitionDidStop] + 55
12 UIKit 0x027773b6 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 237
13 UIKit 0x02777554 -[UIViewAnimationState animationDidStop:finished:] + 68
14 QuartzCore 0x04bc57d8 _ZN2CA5Layer23run_animation_callbacksEPv + 284
15 libdispatch.dylib 0x04186014 _dispatch_client_callout + 14
16 libdispatch.dylib 0x041767d5 _dispatch_main_queue_callback_4CF + 296
17 CoreFoundation 0x012fcaf5 __CFRunLoopRun + 1925
18 CoreFoundation 0x012fbf44 CFRunLoopRunSpecific + 276
19 CoreFoundation 0x012fbe1b CFRunLoopRunInMode + 123
20 GraphicsServices 0x04d237e3 GSEventRunModal + 88
21 GraphicsServices 0x04d23668 GSEventRun + 104
22 UIKit 0x0273965c UIApplicationMain + 1211
23 ??? 0x0b4ee83c 0x0 + 189720636
24 ??? 0x0b4eb0a0 0x0 + 189706400
25 ??? 0x0b4ea7f8 0x0 + 189704184
26 ??? 0x0b4ea903 0x0 + 189704451
27 BudgetPlanner 0x00010252 mono_jit_runtime_invoke + 722
28 BudgetPlanner 0x0017478e mono_runtime_invoke + 126
29 BudgetPlanner 0x00178be4 mono_runtime_exec_main + 420
30 BudgetPlanner 0x00178f55 mono_runtime_run_main + 725
31 BudgetPlanner 0x0006ba65 mono_jit_exec + 149
32 BudgetPlanner 0x0021f65d main + 2013
33 BudgetPlanner 0x00003125 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.
=================================================================
这是控制器的简化版本-仅显示了根视图-在实际控制器中有很多数据。
关于这个例外有什么想法吗? 现在真的开始让我感到困惑。
(在模拟器上运行Monotouch 6.0.8)
谢谢阿什...
我自己已修复此问题。
我认为问题是我在每次重新加载时都替换了root元素以刷新它。 我修改了代码:
public override void ViewWillAppear (bool animated)
{
base.ViewWillAppear (animated);
var caption = "Value..";
if (BankElement != null && !String.IsNullOrWhiteSpace (BankElement.Value)) {
caption = BankElement.Value;
}
if (MyRoot == null) {
MyRoot = new RootElement ("Root");
BankElement = new EntryElement("Enter", caption, "");
MyRoot.Add (new Section("") {BankElement});
rootelement = new RootElement("Root");
rootelement.Add (new Section("") {MyRoot});
Root = rootelement;
}
MyRoot.Caption = caption;
}
所以现在我只创建一个根元素并将其添加到控制器一次,然后更新它。 到目前为止看起来不错!
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