NSLog 的优化

打印日志，是任何开发常用的调试手段。在ios系统提供了打印日志的API The utility functions NSLog() and NSLogv() use the NSString string formatting services to log error messages. Note that as a consequence of this, you should take care when specifying the argument for these functions. A common mistake is to specify a string that includes formatting characters, as shown in the following example.

但是NSLog 很占用性能，如果在release版本上仍然使用了NSLog 会极大的降低性能。通常的做法是

#ifndef DEBUG#define AZLog(fmt, ...) NSLog((@"[文件名:%s]\n" "[函数名:%s]\n" "[行号:%d] \n" fmt"\n\n"), __FILE__, __FUNCTION__, __LINE__, ##__VA_ARGS__)#else#define AZLog(...)#endif

但是 一个项目 是很多人一起写的，每个模块可能 需要打印的日志不一样，或者说，张三写代码的时候，不想看见李四负责模块的打印日志。怎么办？

typedef enum _LogOwner{    Log_All     =0,    Log_LW      =1,    Log_SYX     =2,    Log_Andrew  =3,}LogOwner;#ifdef TEST_ENV_PRODUCTION#define CTLogBase(owner,onwer_type,fmt,...)#elif defined TEST_ENV_QA#define CTLogBase(owner,onwer_type,fmt,...) if ([[CTLog defaultCTLog].owners containsObject:[NSNumber numberWithInteger:Log_All]] || [[CTLog defaultCTLog].owners containsObject:[NSNumber numberWithInteger:onwer_type]])\{\    NSLog((@"%s [owner: %@] [line: %d] " fmt),__FUNCTION__, owner,__LINE__, ##__VA_ARGS__);\}\#endif// NSLog((@"[文件名:%s]" "[函数名:%s]" "[行号:%d]" format), __FILE__, __FUNCTION__, __LINE__, ##__VA_ARGS__);  #define LWLog(fmt,...) CTLogBase(@"LW",Log_LW,fmt,##__VA_ARGS__)#define SYXLog(fmt,...) CTLogBase(@"SYX",Log_SYX,fmt,##__VA_ARGS__)#define AZLog(fmt,...) CTLogBase(@"Andrew",Log_Andrew,fmt,##__VA_ARGS__)

其中 CTLog类为：

////  CTLog.h//  circle_iphone////  Created by Andrew on 15/11/30.//  Copyright © 2015年 ctquan. All rights reserved.//#import <Foundation/Foundation.h>/** *  调试辅助类 */@interface CTLog : NSObject@property (nonatomic,strong)NSMutableArray *owners;#pragma mark - 对外接口+(instancetype)defaultCTLog;/** 只显示该开发者的调试日志 */-(void)setLogOwner:(LogOwner)owner;@end

////  CTLog.m//  circle_iphone////  Created by Andrew on 15/11/30.//  Copyright © 2015年 ctquan. All rights reserved.//#import "CTLog.h"@implementation CTLog+(instancetype)defaultCTLog{    static CTLog *ctlog=nil;    static dispatch_once_t once_log;    dispatch_once(&once_log, ^{        ctlog=[CTLog new];        [ctlog InitArray];    });    return ctlog;}-(void)InitArray{    _owners=[NSMutableArray array];    [_owners addObject:[NSNumber numberWithInteger:Log_All]];}/** 只显示该开发者的调试日志 */-(void)setLogOwner:(LogOwner)owner{    [_owners removeAllObjects];    [_owners addObject:[NSNumber numberWithInteger:owner]];}@end

在appdelegate.m 中 ：

    // 启动调试日志    [CTLog defaultCTLog];    // 只显示该开发者的调试日志    [[CTLog defaultCTLog] setLogOwner:Log_All];