这是Objective C中类似问题的答案，但我不确定将其转换为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我没有提供这些关键信息。
特别是，我不确定是否应该公开本机库，或者是否可以在纯 MonoTouch 中编写它。
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1 回答
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我采用了受Robert Sanders 和 Kresimir Prcela 的回答UIWebView+Debug启发的 Pablo 类别。
请注意，他的代码还包含一个私有 API 调用，您可以使用它来启用远程 Web 检查器。
（由于某种原因，这件事对我不起作用。）
更新： 这里是在 Mountain Lion 中调试 UIWebView 的方法——您需要下载旧版本的 Chromium。
请记住在调试时只使用私有 API——如果您提交应用程序并忘记删除这些调用，Apple 将拒绝您的应用程序。出于这个原因，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+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+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;
}
}
因为我无法让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，请随时发布一个更简单的解决方案。
于 2012-07-17T19:05:42.933 回答