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我对 iOS 开发比较陌生,并且正在尝试实现 CocoaLumberjack 日志记录。

我从https://github.com/robbiehanson/CocoaLumberjack下载了最新的源代码,在我的项目中包含了所需的文件,进行了必要的代码更改,并且得到了下面的运行时链接器错误。

环境为Xcode 4.2 Build 4C199,项目Target设置为Device=iPad,DeploymentTarget=4.3。该项目最初是使用保留/释放编写的,所以我保留了原始源,为我正在使用的 Lumberjack 文件添加编译器标志“-fobjc-arc”:DDFileLogger.m、DDLog.m 和 DDTTYLogger.m .

控制台输出为:

GNU gdb 6.3.50-20050815 (Apple version gdb-1708) (Fri Sep 16 06:56:50 UTC 2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "--host=i386-apple-darwin --target=arm-apple-darwin".tty /dev/ttys001
sharedlibrary apply-load-rules all
target remote-mobile /tmp/.XcodeGDBRemote-10996-56
Switching to remote-macosx protocol
mem 0x1000 0x3fffffff cache
mem 0x40000000 0xffffffff none
mem 0x00000000 0x0fff none
[Switching to process 11779 thread 0x2e03]
[Switching to process 11779 thread 0x2e03]
dyld: lazy symbol binding failed: Symbol not found: _objc_storeStrong
  Referenced from: /var/mobile/Applications/32E4EEB9-765E-4C72-83C8-F5707253AA99/Demo.app/Demo
  Expected in: /usr/lib/libobjc.A.dylib

dyld: Symbol not found: _objc_storeStrong
  Referenced from: /var/mobile/Applications/32E4EEB9-765E-4C72-83C8-F5707253AA99/Demo.app/Demo
  Expected in: /usr/lib/libobjc.A.dylib

warning: Attempting to create USE_BLOCK_IN_FRAME variable with block that isn't in the frame.
(gdb) 

我的项目初​​始化环境如下,其中fileLogger是对应AppDelegate.h文件中定义的实例变量:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    /*
     * Configure the Lumberjack logging framework (we'll use it instead of NSLog)
     */

    // the TTY logger is the Xcode console
    [DDLog addLogger:[DDTTYLogger sharedInstance]];

    // we'll also use a file logger
    fileLogger = [[DDFileLogger alloc] init];
    fileLogger.rollingFrequency = 60 * 60 * 24; // 24 hour rolling
    fileLogger.logFileManager.maximumNumberOfLogFiles = 7;
    [DDLog addLogger:fileLogger];


    // Override point for customization after application launch.
    DDLogInfo(@"didFinishLaunchingWithOptions: entered");

    // create instance of the view controller
    MainViewController *aViewController = [[MainViewController alloc]
                                           initWithNibName:@"MainView" bundle:nil];
    self.mainViewController = aViewController;  // same as: [self setMainViewController:aViewController];
    [aViewController release];

    // Add the main view controller's view to the window and display.
    self.window.rootViewController = self.mainViewController;

    [self.window makeKeyAndVisible];
    return YES;
}

有没有人遇到过这个问题,并且知道解决方案或解决方法?我正在做的事情是否可能......在项目中混合了 ARC 和非 ARC 文件?

4

2 回答 2

8

为了将来参考,这似乎是当前 Xcode 工具链的一个缺点,当当前构建的目标关闭了 ARC 支持(并使用启用 ARC 的静态库)时,它似乎忘记包含 ARC 库。-fobjc-arc您可以使用标志轻松强制链接器包含库,请参阅此相关问题以获取完整描述。

于 2012-01-06T12:28:20.593 回答
3

我刚刚收到一位 CocoaLumberjack 开发人员的回复,他是这样说的:

LLVM 编译器(可能)似乎有一个错误。这是我发现的:

如果你有一个没有默认开启 ARC 的 Xcode 项目,并且你有一个使用 ARC 的文件(通过 -fobjc-arc),并且该文件尝试在 '+ (void)initialize' 中分配/初始化内容,那么它将在运行时爆炸。

但是,如果您将项目转换为 ARC,它似乎可以工作......

编辑:来自开发人员的附加信息:

1.2.3 标签可以在没有 ARC 的情况下使用。

您可以从此处获取存档:

https://github.com/robbiehanson/CocoaLumberjack/tags

于 2011-12-07T00:14:02.783 回答