objective-c 如何打印出方法名和行号并有条件地禁用NSLog？

Question

提问by rein

I'm doing a presentation on debugging in Xcode and would like to get more information on using NSLog efficiently.

我正在做一个关于在 Xcode 中调试的演示，并希望获得有关有效使用 NSLog 的更多信息。

In particular, I have two questions:

特别是，我有两个问题：

is there a way to easily NSLog the current method's name / line number?
is there a way to "disable" all NSLogs easily before compiling for release code?

有没有办法轻松 NSLog 当前方法的名称/行号？
有没有办法在编译发布代码之前轻松“禁用”所有 NSLogs？

Answer 1

回答by diederikh

Here are some useful macros around NSLog I use a lot:

这里有一些关于 NSLog 的有用的宏，我经常使用：

#ifdef DEBUG
#   define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)
#else
#   define DLog(...)
#endif

// ALog always displays output regardless of the DEBUG setting
#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)

The DLog macro is used to only output when the DEBUG variable is set (-DDEBUG in the projects's C flags for the debug confirguration).

DLog 宏仅用于在设置 DEBUG 变量时输出（项目的 C 标志中的 -DDEBUG 用于调试配置）。

ALog will always output text (like the regular NSLog).

ALog 将始终输出文本（就像常规的 NSLog）。

The output (e.g. ALog(@"Hello world") ) will look like this:

输出（例如 ALog(@"Hello world") ）将如下所示：

-[LibraryController awakeFromNib] [Line 364] Hello world

Answer 2

回答by whitneyland

I've taken DLogand ALogfrom above, and added ULogwhich raises a UIAlertViewmessage.

我已经从上面获取了DLog和ALog，并添加了ULog它引发了一条UIAlertView消息。

To summarize:

总结一下：

DLogwill output like NSLogonly when the DEBUG variable is set
ALogwill always output like NSLog
ULogwill show the UIAlertViewonly when the DEBUG variable is set

DLogNSLog仅在设置了 DEBUG 变量时才会输出
ALog总是会输出像 NSLog
ULog将UIAlertView仅在设置了 DEBUG 变量时显示

#ifdef DEBUG
#   define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
#else
#   define DLog(...)
#endif
#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
#ifdef DEBUG
#   define ULog(fmt, ...)  { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%s\n [Line %d] ", __PRETTY_FUNCTION__, __LINE__] message:[NSString stringWithFormat:fmt, ##__VA_ARGS__]  delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; }
#else
#   define ULog(...)
#endif

This is what it looks like:

这是它的样子：

Debug UIAlertView

调试 UIAlertView

+1 Diederik

+1 迪德里克

Answer 3

回答by stefanB

NSLog(@"%s %d %s %s", __FILE__, __LINE__, __PRETTY_FUNCTION__, __FUNCTION__);

Outputs file name, line number, and function name:

输出文件名、行号和函数名：

/proj/cocoa/cdcli/cdcli.m 121 managedObjectContext managedObjectContext

__FUNCTION__in C++ shows mangled name __PRETTY_FUNCTION__shows nice function name, in cocoa they look the same.

__FUNCTION__在 C++ 中显示损坏的名称__PRETTY_FUNCTION__显示了不错的函数名称，在可可中它们看起来相同。

I'm not sure what is the proper way of disabling NSLog, I did:

我不确定禁用 NSLog 的正确方法是什么，我做了：

#define NSLog

And no logging output showed up, however I don't know if this has any side effects.

并且没有显示日志输出，但是我不知道这是否有任何副作用。

Answer 4

回答by SEQOY Development Team

Here one big collection of debug constants that we use. Enjoy.

这是我们使用的一大堆调试常量。享受。

// Uncomment the defitions to show additional info.

//  #define DEBUG

//  #define DEBUGWHERE_SHOWFULLINFO

//  #define DEBUG_SHOWLINES
//  #define DEBUG_SHOWFULLPATH
//  #define DEBUG_SHOWSEPARATORS
//  #define DEBUG_SHOWFULLINFO


// Definition of DEBUG functions. Only work if DEBUG is defined.
#ifdef DEBUG 

    #define debug_separator() NSLog( @"────────────────────────────────────────────────────────────────────────────" );

    #ifdef DEBUG_SHOWSEPARATORS
        #define debug_showSeparators() debug_separator();
    #else
        #define debug_showSeparators()
    #endif

    /// /// /// ////// ///// 

    #ifdef DEBUG_SHOWFULLPATH
        #define debug_whereFull() debug_showSeparators(); NSLog(@"Line:%d : %s : %s", __LINE__,__FILE__,__FUNCTION__); debug_showSeparators(); 
    #else
        #define debug_whereFull() debug_showSeparators(); NSLog(@"Line:%d : %s : %s", __LINE__,[ [ [ [NSString alloc] initWithBytes:__FILE__ length:strlen(__FILE__) encoding:NSUTF8StringEncoding] lastPathComponent] UTF8String ] ,__FUNCTION__); debug_showSeparators(); 
    #endif

    /// /// /// ////// ///// 

    #define debugExt(args,...) debug_separator(); debug_whereFull(); NSLog( args, ##__VA_ARGS__); debug_separator();

    /// /// /// ////// ///// Debug Print Macros

    #ifdef DEBUG_SHOWFULLINFO
        #define debug(args,...) debugExt(args, ##__VA_ARGS__);
    #else
        #ifdef DEBUG_SHOWLINES
            #define debug(args,...) debug_showSeparators(); NSLog([ NSString stringWithFormat:@"Line:%d : %@", __LINE__, args ], ##__VA_ARGS__); debug_showSeparators();
        #else
            #define debug(args,...) debug_showSeparators(); NSLog(args, ##__VA_ARGS__); debug_showSeparators();
        #endif
    #endif

    /// /// /// ////// ///// Debug Specific Types

    #define debug_object( arg ) debug( @"Object: %@", arg );
    #define debug_int( arg ) debug( @"integer: %i", arg );
    #define debug_float( arg ) debug( @"float: %f", arg );
    #define debug_rect( arg ) debug( @"CGRect ( %f, %f, %f, %f)", arg.origin.x, arg.origin.y, arg.size.width, arg.size.height );
    #define debug_point( arg ) debug( @"CGPoint ( %f, %f )", arg.x, arg.y );
    #define debug_bool( arg )   debug( @"Boolean: %@", ( arg == YES ? @"YES" : @"NO" ) );

    /// /// /// ////// ///// Debug Where Macros

    #ifdef DEBUGWHERE_SHOWFULLINFO
        #define debug_where() debug_whereFull(); 
    #else
        #define debug_where() debug(@"%s",__FUNCTION__); 
    #endif

    #define debug_where_separators() debug_separator(); debug_where(); debug_separator();

    /// /// /// ////// /////

#else
    #define debug(args,...) 
    #define debug_separator()  
    #define debug_where()   
    #define debug_where_separators()  
    #define debug_whereFull()   
    #define debugExt(args,...)
    #define debug_object( arg ) 
    #define debug_int( arg ) 
    #define debug_rect( arg )   
    #define debug_bool( arg )   
    #define debug_point( arg )
    #define debug_float( arg )
#endif

Answer 5

回答by Rodrigo

There are a new trick that no answer give. You can use printfinstead NSLog. This will give you a clean log:

有一个没有答案的新技巧。您可以printf改用NSLog. 这会给你一个干净的日志：

With NSLogyou get things like this:

随着NSLog你得到这样的事情：

2011-11-03 13:43:55.632 myApp[3739:207] Hello Word

But with printfyou get only:

但printf你只会得到：

Hello World

Use this code

使用此代码

#ifdef DEBUG
    #define NSLog(FORMAT, ...) fprintf(stderr,"%s\n", [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]);
#else
    #define NSLog(...) {}              
#endif

Answer 6

回答by Marc Charbonneau

My answer to this questionmight help, looks like it's similar to the one Diederik cooked up. You may also want to replace the call to NSLog()with a static instance of your own custom logging class, that way you can add a priority flag for debug/warning/error messages, send messages to a file or database as well as the console, or pretty much whatever else you can think of.

我对这个问题的回答可能会有所帮助，看起来它类似于 Diederik 制作的那个。您可能还想将调用替换NSLog()为您自己的自定义日志记录类的静态实例，这样您就可以为调试/警告/错误消息添加优先级标志，将消息发送到文件或数据库以及控制台，或者几乎任何你能想到的。

#define DEBUG_MODE

#ifdef DEBUG_MODE
    #define DebugLog( s, ... ) NSLog( @"<%p %@:(%d)> %@", self, 
              [[NSString stringWithUTF8String:__FILE__] lastPathComponent], 
              __LINE__, 
              [NSString stringWithFormat:(s), 
              ##__VA_ARGS__] )
#else
    #define DebugLog( s, ... ) 
#endif

Answer 7

回答by chunkyguy

Disabling all NSLogs, for somebody allergic to MACROS, here is something that you can compile too:

禁用所有 NSLogs，对于对 MACROS 过敏的人，这里有一些你也可以编译的东西：

void SJLog(NSString *format,...)
{
    if(LOG)
    {   
        va_list args;
        va_start(args,format);
        NSLogv(format, args);
        va_end(args);
    }
}

And, use it almost like NSLog:

并且，几乎像 NSLog 一样使用它：

SJLog(@"bye bye NSLogs !");

From this blog: https://whackylabs.com/logging/ios/2011/01/19/ios-moving-in-and-out-of-nslogs/

来自这个博客：https: //whackylabs.com/logging/ios/2011/01/19/ios-moving-in-and-out-of-nslogs/

Answer 8

回答by Quinn Taylor

To complement the answers above, it can be quite useful to use a replacement for NSLog in certain situations, especially when debugging. For example, getting rid of all the date and process name/id information on each line can make output more readable and faster to boot.

为了补充上面的答案，在某些情况下使用 NSLog 的替代品非常有用，尤其是在调试时。例如，去掉每一行上的所有日期和进程名称/id 信息可以使输出更具可读性和更快的启动。

The following link provides quite a bit of useful ammo for making simple logging much nicer.

以下链接提供了相当多有用的弹药，可让简单的日志记录变得更好。

http://cocoaheads.byu.edu/wiki/a-different-nslog

Answer 9

回答by AddisDev

It's easy to change your existing NSLogs to display line number and class from which they are called. Add one line of code to your prefix file:

更改现有 NSLogs 以显示调用它们的行号和类很容易。将一行代码添加到您的前缀文件中：

#define NSLog(__FORMAT__, ...) NSLog((@"%s [Line %d] " __FORMAT__), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)

Answer 10

回答by Venkat Reddy

It is simple,for Example

这很简单，例如

-(void)applicationWillEnterForeground:(UIApplication *)application {
    NSLog(@"%s", __PRETTY_FUNCTION__);
}

Output:-[AppDelegate applicationWillEnterForeground:]

输出：-[AppDelegate applicationWillEnterForeground:]

objective-c 如何打印出方法名和行号并有条件地禁用NSLog？

提问by rein

回答by diederikh

回答by whitneyland

回答by stefanB

回答by SEQOY Development Team

回答by Rodrigo

回答by Marc Charbonneau

回答by chunkyguy

回答by Quinn Taylor

回答by AddisDev

回答by Venkat Reddy

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objective-c 如何打印出方法名和行号并有条件地禁用NSLog？

提问by rein

回答by diederikh

回答by whitneyland

回答by stefanB

回答by SEQOY Development Team

回答by Rodrigo

回答by Marc Charbonneau

回答by chunkyguy

回答by Quinn Taylor

回答by AddisDev

回答by Venkat Reddy

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