如何在MonoTouch中捕获UIWebView错误？

Question

这是Objective C中类似问题的答案 ，但我不确定将它翻译成MonoTouch的正确方法是什么。

基本上，我希望能够捕获JavaScript错误并至少知道文件名和行号 - 不幸的是， window.onerror没有提供这些重要信息。

特别是，我不确定是否应该公开本机库，或者我是否可以在纯MonoTouch中编写它。

Answer 1

我采用了由Robert Sanders和Kresimir Prcela的答案启发的Pablo的UIWebView+Debug类别。

请注意，他的代码还包括一个私有API调用，可用于启用远程Web检查器 。
（出于某种原因，这件事对我来说不起作用。）

更新： 这里的如何在山调试UIWebView的狮子，你需要下载Chromium的旧版本。

请记住在调试时仅使用私有API - 如果您提交应用并忘记删除这些呼叫，Apple将拒绝您的应用。 因此，Xcode和MonoDevelop代码都使用DEBUG条件。

这是我正在使用的完整源代码：

Xcode项目

UIWebView的+ Debug.h

//
//  WebView+Debug.h
//  VOL
//
//  Created by Pablo Guillen Schlippe on 26.07.11.
//  Copyright 2011 Medienhaus.
//

/*

 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 associated documentation files (the "Software"), to deal in the Software without restriction, 
 including without limitation the rights to use, copy, modify, merge, publish, distribute, 
 sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in all copies or 
 substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT 
 NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
 OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

 */

// This little drop in category is based on the following StackOverflow article:
// https://stackoverflow.com/questions/193119/


#ifdef DEBUG

// Use this to toggle logging
#define kDidParseSource         0
#define kFailedToParseSource    1
#define kExceptionWasRaised     1
#define kDidEnterCallFrame      0
#define kWillExecuteStatement   0
#define kWillLeaveCallFrame     0

void enableRemoteWebInspector(void);

#endif

UIWebView的+ Debug.m

//
//  WebView+Debug.m
//  VOL
//
//  Created by Pablo Guillen Schlippe on 26.07.11.
//  Copyright 2011 Medienhaus. All rights reserved.
//

#ifdef DEBUG

#import <objc/runtime.h>
#import "UIWebView+Debug.h"

@class WebView;
@class WebFrame;
@class WebScriptCallFrame;

#pragma mark -

static NSString* getAddress() {
    id myhost =[NSClassFromString(@"NSHost") performSelector:@selector(currentHost)];

    if (myhost) {
        for (NSString* address in [myhost performSelector:@selector(addresses)]) {
            if ([address rangeOfString:@"::"].location == NSNotFound) {
                return address;
            }
        }
    }

    return @"127.0.0.1";
}

void enableRemoteWebInspector() {
    [NSClassFromString(@"WebView") performSelector:@selector(_enableRemoteInspector)];
    NSLog(@"Point your browser at http://%@:9999", getAddress());
}

#pragma mark -

@interface ScriptDebuggerDelegate : NSObject

-(id)functionNameForFrame:(WebScriptCallFrame*)frame;
-(id)callerForFrame:(WebScriptCallFrame*)frame;
-(id)exceptionForFrame:(WebScriptCallFrame*)frame;

@end

#pragma mark -

@implementation ScriptDebuggerDelegate

// We only have access to the public methods declared in the header / class
// The private methods can also be accessed but raise a warning.
// Use runtime selectors to suppress warnings

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"

-(id)functionNameForFrame:(WebScriptCallFrame*)frame {
    SEL functionNameSelector = @selector(functionName);
    return [(id)frame performSelector:functionNameSelector];
}

-(id)callerForFrame:(WebScriptCallFrame*)frame {
    SEL callerSelector = @selector(caller);
    return [(id)frame performSelector:callerSelector];
}

-(id)exceptionForFrame:(WebScriptCallFrame*)frame {
    SEL exceptionSelector = @selector(exception);
    return [(id)frame performSelector:exceptionSelector];
}

#pragma clang diagnostic pop

- (void)webView:(WebView *)webView      didParseSource:(NSString *)source
 baseLineNumber:(unsigned)lineNumber
        fromURL:(NSURL *)url
       sourceId:(int)sid
    forWebFrame:(WebFrame *)webFrame {
    if (kDidParseSource)
        NSLog(@"ScriptDebugger called didParseSource: \nsourceId=%d, \nurl=%@", sid, url);
}

// some source failed to parse
- (void)webView:(WebView *)webView failedToParseSource:(NSString *)source
 baseLineNumber:(unsigned)lineNumber
        fromURL:(NSURL *)url
      withError:(NSError *)error
    forWebFrame:(WebFrame *)webFrame {
    if (kFailedToParseSource)
        NSLog(@"ScriptDebugger called failedToParseSource:\
              \nurl=%@ \nline=%d \nerror=%@ \nsource=%@",
              url, lineNumber, error, source);
}

- (void)webView:(WebView *)webView  exceptionWasRaised:(WebScriptCallFrame *)frame
       sourceId:(int)sid
           line:(int)lineno
    forWebFrame:(WebFrame *)webFrame {
    if (kExceptionWasRaised)
        NSLog(@"ScriptDebugger exception:\
              \nsourceId=%d \nline=%d \nfunction=%@, \ncaller=%@, \nexception=%@",
              sid,
              lineno,
              [self functionNameForFrame:frame],
              [self callerForFrame:frame],
              [self exceptionForFrame:frame]);
}

// just entered a stack frame (i.e. called a function, or started global scope)
- (void)webView:(WebView *)webView    didEnterCallFrame:(WebScriptCallFrame *)frame
       sourceId:(int)sid
           line:(int)lineno
    forWebFrame:(WebFrame *)webFrame {
    if (kDidEnterCallFrame)
        NSLog(@"ScriptDebugger didEnterCallFrame:\
              \nsourceId=%d \nline=%d \nfunction=%@, \ncaller=%@, \nexception=%@",
              sid,
              lineno,
              [self functionNameForFrame:frame],
              [self callerForFrame:frame],
              [self exceptionForFrame:frame]);
}

// about to execute some code
- (void)webView:(WebView *)webView willExecuteStatement:(WebScriptCallFrame *)frame
       sourceId:(int)sid
           line:(int)lineno
    forWebFrame:(WebFrame *)webFrame {
    if (kWillExecuteStatement)
        NSLog(@"ScriptDebugger willExecuteStatement:\
              \nsourceId=%d \nline=%d \nfunction=%@, \ncaller=%@, \nexception=%@",
              sid,
              lineno,
              [self functionNameForFrame:frame],
              [self callerForFrame:frame],
              [self exceptionForFrame:frame]);
}

// about to leave a stack frame (i.e. return from a function)
- (void)webView:(WebView *)webView   willLeaveCallFrame:(WebScriptCallFrame *)frame
       sourceId:(int)sid
           line:(int)lineno
    forWebFrame:(WebFrame *)webFrame {
    if (kWillLeaveCallFrame)
        NSLog(@"ScriptDebugger willLeaveCallFrame:\
              \nsourceId=%d \nline=%d \nfunction=%@, \ncaller=%@, \nexception=%@",
              sid,
              lineno,
              [self functionNameForFrame:frame],
              [self callerForFrame:frame],
              [self exceptionForFrame:frame]);
}

@end

#pragma mark -

@interface UIWebView ()

-(id)setScriptDebugDelegate:(id)delegate;

@end

#pragma mark -

@implementation UIWebView (Debug)

- (void)webView:(id)sender didClearWindowObject:(id)windowObject
       forFrame:(WebFrame*)frame {
    ScriptDebuggerDelegate* delegate = [[ScriptDebuggerDelegate alloc] init];
    objc_setAssociatedObject(sender, @"ScriptDebuggerDelegate", delegate, OBJC_ASSOCIATION_RETAIN);
    [sender setScriptDebugDelegate:delegate];
}

@end

#endif

MonoTouch项目

AppDelegate.cs

[Register ("AppDelegate")]
public partial class AppDelegate : UIApplicationDelegate
{
    [Conditional("DEBUG")]
    [DllImport ("__Internal", EntryPoint = "enableWebInspector")]
    public extern static void EnableRemoteWebInspector ();

    public override bool FinishedLaunching (UIApplication application, NSDictionary launchOptions)
    {
        // It will tell you the port in the console,
        // More info here: http://antony_perkov.blogspot.com/2012/03/debugging-uiwebview-content-in.html
        EnableRemoteWebInspector(); 
        return true;
    }
}    

因为我无法使LinkWith属性正常工作，所以我把它放在项目属性中：

iPhone构建项目选项

模拟器

-gcc_flags "-L${ProjectDir}/Native -lNativeLib-arm7 -force_load ${ProjectDir}/Native/libNativeLib-arm7.a"

设备

-gcc_flags "-L${ProjectDir}/Native -lNativeLib-i386 -force_load ${ProjectDir}/Native/libNativeLib-i386.a"

自定义命令>构建之前

命令

模拟器

sh ${SolutionDir}/NativeLib/compile-arm "${ProjectConfigName}"

设备

sh ${SolutionDir}/NativeLib/compile-arm "${ProjectConfigName}"

工作目录

${SolutionDir}/NativeLib

最后，这些是构建脚本：

编译I386

xcodebuild -project NativeLib.xcodeproj -target NativeLib -sdk iphonesimulator -configuration $1 clean build
cp build/$1-iphonesimulator/libNativeLib.a ../ProjectName/Native/libNativeLib-i386.a

编译臂

xcodebuild -project NativeLib.xcodeproj -target NativeLib -sdk iphoneos -arch armv6 -configuration $1 clean build
cp build/$1-iphoneos/libNativeLib.a ../ProjectName/Native/libNativeLib-arm6.a
xcodebuild -project NativeLib.xcodeproj -target NativeLib -sdk iphoneos -arch armv7 -configuration $1 clean build
cp build/$1-iphoneos/libNativeLib.a ../ProjectName/Native/libNativeLib-arm7.a

---

我意识到这可能不是最好的方法，但它工作得很好。
如果您知道一个，请随意发布一个更简单的解决方案。