我正在做一个关于在Xcode中调试的演示,想要获得更多关于有效使用NSLog的信息。

我特别想问两个问题:

是否有一种方法可以轻松地NSLog当前方法的名称/行号? 在编译发布代码之前,是否有一种方法可以轻松地“禁用”所有nslog ?


当前回答

这里是我们使用的调试常量的一个大集合。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

其他回答

禁用所有nslog,对于那些对MACROS过敏的人,这里有一些东西你也可以编译:

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

并且,像NSLog一样使用它:

SJLog(@"bye bye NSLogs !");

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

我对这个问题的回答可能会有所帮助,看起来它与Diederik编造的答案相似。你可能还想用你自己的自定义日志类的静态实例替换NSLog()的调用,这样你就可以为调试/警告/错误消息添加一个优先级标志,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东西。

#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

一段时间以来,我一直在使用上面几个宏的站点。我的重点是登录控制台,重点是控制和过滤的冗长;如果您不介意大量的日志行,但想要轻松地开关它们的批量,那么您可能会发现这很有用。

首先,我可以选择用上面@Rodrigo所描述的printf替换NSLog

#define NSLOG_DROPCHAFF//comment out to get usual date/time ,etc:2011-11-03 13:43:55.632 myApp[3739:207] Hello Word

#ifdef NSLOG_DROPCHAFF
#define NSLog(FORMAT, ...) printf("%s\n", [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]);
#endif

接下来,我打开或关闭登录。

#ifdef DEBUG
#define LOG_CATEGORY_DETAIL// comment out to turn all conditional logging off while keeping other DEBUG features
#endif

在主块中,定义与应用程序中的模块对应的各种类别。还定义一个日志级别,在此级别以上的日志调用将不会被调用。然后定义各种类型的NSLog输出

#ifdef LOG_CATEGORY_DETAIL

    //define the categories using bitwise leftshift operators
    #define kLogGCD (1<<0)
    #define kLogCoreCreate (1<<1)
    #define kLogModel (1<<2)
    #define kLogVC (1<<3)
    #define kLogFile (1<<4)
    //etc

    //add the categories that should be logged...
    #define kLOGIFcategory kLogModel+kLogVC+kLogCoreCreate

    //...and the maximum detailLevel to report (use -1 to override the category switch)
    #define kLOGIFdetailLTEQ 4

    // output looks like this:"-[AppDelegate myMethod] log string..."
    #   define myLog(category,detailLevel,format, ...) if(detailLevel<0 || ((category&kLOGIFcategory)&&detailLevel<= kLOGIFdetailLTEQ)) {NSLog((@"%s " format), __PRETTY_FUNCTION__, ##__VA_ARGS__);}

    // output also shows line number:"-[AppDelegate myMethod][l17]  log string..."
    #   define myLogLine(category,detailLevel,format, ...) if(detailLevel<0 || ((category&kLOGIFcategory)&&detailLevel<= kLOGIFdetailLTEQ)) {NSLog((@"%s[l%i] " format), __PRETTY_FUNCTION__,__LINE__ ,##__VA_ARGS__);}

    // output very simple:" log string..."
    #   define myLogSimple(category,detailLevel,format, ...) if(detailLevel<0 || ((category&kLOGIFcategory)&&detailLevel<= kLOGIFdetailLTEQ)) {NSLog((@"" format), ##__VA_ARGS__);}

    //as myLog but only shows method name: "myMethod: log string..."
    // (Doesn't work in C-functions)
    #   define myLog_cmd(category,detailLevel,format,...) if(detailLevel<0 || ((category&kLOGIFcategory)&&detailLevel<= kLOGIFdetailLTEQ)) {NSLog((@"%@: " format), NSStringFromSelector(_cmd), ##__VA_ARGS__);}

    //as myLogLine but only shows method name: "myMethod>l17: log string..."
    #   define myLog_cmdLine(category,detailLevel,format, ...) if(detailLevel<0 || ((category&kLOGIFcategory)&&detailLevel<= kLOGIFdetailLTEQ)) {NSLog((@"%@>l%i: " format), NSStringFromSelector(_cmd),__LINE__ , ##__VA_ARGS__);}

    //or define your own...
   // # define myLogEAGLcontext(category,detailLevel,format, ...) if(detailLevel<0 || ((category&kLOGIFcategory)&&detailLevel<= kLOGIFdetailLTEQ)) {NSLog((@"%s>l%i (ctx:%@)" format), __PRETTY_FUNCTION__,__LINE__ ,[EAGLContext currentContext], ##__VA_ARGS__);}

#else
    #   define myLog_cmd(...)
    #   define myLog_cmdLine(...)
    #   define myLog(...)
    #   define myLogLine(...)
    #   define myLogSimple(...)
    //#   define myLogEAGLcontext(...)
#endif

因此,使用kLOGIFcategory和kLOGIFdetailLTEQ的当前设置,调用如下

myLogLine(kLogVC, 2, @"%@",self);

会打印,但这个不会

myLogLine(kLogGCD, 2, @"%@",self);//GCD not being printed

也不会

myLogLine(kLogGCD, 12, @"%@",self);//level too high

如果您想覆盖单个日志调用的设置,请使用负级别:

myLogLine(kLogGCD, -2, @"%@",self);//now printed even tho' GCD category not active.

我发现每行多打几个字是值得的

打开或关闭整个评论类别(例如,只报告那些标记为Model的调用) 报告细节时使用较高级别的数字,或者只报告最重要的电话时使用较低的数字

我相信很多人会觉得这有点过分,但以防有人发现它适合他们的目的。

这里是我们使用的调试常量的一个大集合。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

更改现有nslog以显示调用它们的行号和类是很容易的。在前缀文件中添加一行代码:

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