当 NSMutableArray 转为 plist 时应用程序崩溃
我有一个名为 *favorites 的 NSMutableArray。它是一个 NSStrings 数组，我想将其写入 .plist 文件。
当我调用时：
favPath = [[NSBundle mainBundle] pathForResource:@"Favorites" ofType:@"plist"];
[favorites writeToFile:favPath automatically:YES];
它崩溃并出现异常类型 EXC_BAD_ACCESS (SIGBUS) 和异常代码 KERN_PROTECTION_FAILURE at 0x00000006
我已包含崩溃日志、Favorites.plist 和代码片段调用该方法的代码。非常感谢您的帮助！
崩溃日志：
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00000006
Crashed Thread: 0
Thread 0 Crashed:
0 libobjc.A.dylib 0x000034f8 objc_msgSend + 24
1 Foundation 0x00011ae6 _NSWriteBytesToFileWithExtendedAttributes + 56
2 Foundation 0x00011aa0 _NSWriteBytesToFile + 20
3 Foundation 0x00011a60 -[NSData(NSData) writeToFile:atomically:] + 60
4 Foundation 0x00049124 -[NSArray(NSArray) writeToFile:atomically:] + 148
5 CoderPlus 0x00005a7a -[HTMLViewController tableView:didSelectRowAtIndexPath:] (HTMLViewController.m:277)
6 UIKit 0x000c3f98 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 884
7 UIKit 0x000d4084 -[UITableView _userSelectRowAtIndexPath:] + 196
8 Foundation 0x00088334 __NSFireDelayedPerform + 360
9 CoreFoundation 0x00074256 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 10
10 CoreFoundation 0x00076966 __CFRunLoopDoTimer + 1038
11 CoreFoundation 0x000773ea __CFRunLoopRun + 1178
12 CoreFoundation 0x0001e0bc CFRunLoopRunSpecific + 220
13 CoreFoundation 0x0001dfca CFRunLoopRunInMode + 54
14 GraphicsServices 0x00003f88 GSEventRunModal + 188
15 UIKit 0x00007b40 -[UIApplication _run] + 564
16 UIKit 0x00005fb8 UIApplicationMain + 964
17 CoderPlus 0x0000837a main (main.m:14)
18 CoderPlus 0x00002c38 start + 32
Favorites.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
</array>
</plist>
导致崩溃的方法：（cellTitle 是一个 NSString 对象）
if (favButtonActive == [NSNumber numberWithInt: 1]) {
// Write selection to Favorites.plist
if ([favorites containsObject:cellTitle]) {
[favorites removeObject:cellTitle];
} else {
[favorites addObject:cellTitle];
}
[favorites writeToFile:favPath atomically:YES];
[table reloadData];
}
I have an NSMutableArray called *favorites. It is an array of NSStrings and I want to write it to a .plist file.
When I call:
favPath = [[NSBundle mainBundle] pathForResource:@"Favorites" ofType:@"plist"];
[favorites writeToFile:favPath automatically:YES];
it crashes with the exception type EXC_BAD_ACCESS (SIGBUS) and with the exception code KERN_PROTECTION_FAILURE at 0x00000006
I have included the crashlog, the Favorites.plist, and a snippet of code where the method is being called. Help would be highly appreciated!
Crashlog:
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00000006
Crashed Thread: 0
Thread 0 Crashed:
0 libobjc.A.dylib 0x000034f8 objc_msgSend + 24
1 Foundation 0x00011ae6 _NSWriteBytesToFileWithExtendedAttributes + 56
2 Foundation 0x00011aa0 _NSWriteBytesToFile + 20
3 Foundation 0x00011a60 -[NSData(NSData) writeToFile:atomically:] + 60
4 Foundation 0x00049124 -[NSArray(NSArray) writeToFile:atomically:] + 148
5 CoderPlus 0x00005a7a -[HTMLViewController tableView:didSelectRowAtIndexPath:] (HTMLViewController.m:277)
6 UIKit 0x000c3f98 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 884
7 UIKit 0x000d4084 -[UITableView _userSelectRowAtIndexPath:] + 196
8 Foundation 0x00088334 __NSFireDelayedPerform + 360
9 CoreFoundation 0x00074256 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 10
10 CoreFoundation 0x00076966 __CFRunLoopDoTimer + 1038
11 CoreFoundation 0x000773ea __CFRunLoopRun + 1178
12 CoreFoundation 0x0001e0bc CFRunLoopRunSpecific + 220
13 CoreFoundation 0x0001dfca CFRunLoopRunInMode + 54
14 GraphicsServices 0x00003f88 GSEventRunModal + 188
15 UIKit 0x00007b40 -[UIApplication _run] + 564
16 UIKit 0x00005fb8 UIApplicationMain + 964
17 CoderPlus 0x0000837a main (main.m:14)
18 CoderPlus 0x00002c38 start + 32
Favorites.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
</array>
</plist>
Method that's causing the crash: (cellTitle is an NSString object)
if (favButtonActive == [NSNumber numberWithInt: 1]) {
// Write selection to Favorites.plist
if ([favorites containsObject:cellTitle]) {
[favorites removeObject:cellTitle];
} else {
[favorites addObject:cellTitle];
}
[favorites writeToFile:favPath atomically:YES];
[table reloadData];
}
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您无法在 iPhone 上写入或修改应用程序包中的文件。如果要保存数据，请在应用程序的文档目录中创建文件。您可以像这样获取文档目录：
然后，只需使用
NSString的stringByAppendingPathComponent:方法附加您的文件名。查看 Apple 的低级文件管理编程主题，了解有关应用程序数据保存位置的更多信息。
You cannot write or modify a file in the application bundle on the iPhone. If you want to save data, create your file in the documents directory for your application. You can get the documents directory like this:
Then, just append your filename using
NSString'sstringByAppendingPathComponent:method.Check out Apple's Low-Level File Management Programming Topics for more information on where to save data from your application.
这可能不是导致崩溃的原因，但将内容写回到包中是非常糟糕的做法。我什至不确定这是否有效。如果应用程序包目录是只读的，那么您的应用程序可能会因上述内容而崩溃。
可以从应用程序包中读取初始文件，但如果您想更改并保留该数据，则必须将其写入
Documents目录。 Stack Overflow 上对此进行了详细介绍。This is probably not the cause of your crash, but it is very bad practice to write stuff back to the bundle. I'm not even sure that works. If the app bundle directory is read-only then it is possible that your app crashes with the above.
It is fine to read an initial file from your app bundle, but if you want to change and persist that data then you must write it to the
Documentsdirectory. This is well covered here on Stack Overflow.