My DDLog config

LTLog.h

//
//  LTLog.h
//
//  Created by Lex on 6/29/14.
//  Copyright (c) 2014 LexTang.com. All rights reserved.
//  https://gist.github.com/lexrus/8c6414e7c0177e9e66ea
//

#import <Foundation/Foundation.h>

#define DD_LEGACY_MACROS 0

#import <CocoaLumberjack/CocoaLumberjack.h>
#import <CocoaLumberjack/DDTTYLogger.h>
#import <CocoaLumberjack/DDASLLogger.h>

#ifdef DEBUG
static const int ddLogLevel = DDLogLevelVerbose;
#else
static const int ddLogLevel = DDLogLevelOff;
#endif

@interface LTLog : NSObject <DDLogFormatter>

@end

LTLog.m

//
//  LTLog.m
//
//  Created by Lex on 6/29/14.
//  Copyright (c) 2014 LexTang.com. All rights reserved.
//  https://gist.github.com/lexrus/8c6414e7c0177e9e66ea
//

#import "LTLog.h"
#import <libkern/OSAtomic.h>

#define kDateFormatString @"HH:mm:ss:SSS"

@implementation LTLog {
    int atomicLoggerCount;
    NSDateFormatter *threadUnsafeDateFormatter;
}

+ (void)load {
    [DDLog addLogger:[DDASLLogger sharedInstance]];

    [DDLog addLogger:[DDTTYLogger sharedInstance]];
    [[DDTTYLogger sharedInstance] setColorsEnabled:YES];

    LTLog *log = LTLog.new;

    [[DDASLLogger sharedInstance] setLogFormatter:log];
    [[DDTTYLogger sharedInstance] setLogFormatter:log];
}

- (NSString *)stringFromDate:(NSDate *)date {
    int32_t loggerCount = OSAtomicAdd32(0, &atomicLoggerCount);

    NSLocale *posixLocale =
        [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];

    if (loggerCount <= 1) {
        // Single-threaded mode.

        if (threadUnsafeDateFormatter == nil) {
            threadUnsafeDateFormatter = [[NSDateFormatter alloc] init];
            [threadUnsafeDateFormatter
                setFormatterBehavior:NSDateFormatterBehavior10_4];
            [threadUnsafeDateFormatter setLocale:posixLocale];
            [threadUnsafeDateFormatter setDateFormat:kDateFormatString];
        }

        return [threadUnsafeDateFormatter stringFromDate:date];
    } else {
        // Multi-threaded mode.
        // NSDateFormatter is NOT thread-safe.

        NSString *key = @"MyCustomFormatter_NSDateFormatter";

        NSMutableDictionary *threadDictionary =
            [[NSThread currentThread] threadDictionary];
        NSDateFormatter *dateFormatter = threadDictionary[key];

        if (dateFormatter == nil) {
            dateFormatter = [[NSDateFormatter alloc] init];
            [dateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
            [dateFormatter setLocale:posixLocale];
            [dateFormatter setDateFormat:kDateFormatString];

            threadDictionary[key] = dateFormatter;
        }

        return [dateFormatter stringFromDate:date];
    }
}

- (NSString *)formatLogMessage:(DDLogMessage *)logMessage {
    NSString *logLevel;
    switch (logMessage->_flag) {
    case DDLogFlagError:
        logLevel = @"🆘";
        break;
    case DDLogFlagWarning:
        logLevel = @"❎";
        break;
    case DDLogFlagInfo:
        logLevel = @"✅";
        break;
    case DDLogFlagDebug:
        logLevel = @"🚸";
        break;
    default:
        logLevel = @"🔸";
        break;
    }

    NSString *dateAndTime = [self stringFromDate:(logMessage->_timestamp)];
    NSString *logMsg = logMessage->_message;
    NSString *fileName = logMessage.fileName;
    NSUInteger lineNumber = logMessage->_line;

    return
        [NSString stringWithFormat:@"%@ %@ %@:%lu> %@", logLevel, dateAndTime,
                                   fileName, lineNumber, logMsg];
}

- (void)didAddToLogger:(id<DDLogger>) __attribute__((unused))logger {
    OSAtomicIncrement32(&atomicLoggerCount);
}

- (void)willRemoveFromLogger:(id<DDLogger>) __attribute__((unused))logger {
    OSAtomicDecrement32(&atomicLoggerCount);
}

@end

1. Install CocoaLumberjack with CocoaPods: pod "CocoaLumberjack", "~> 2.0" and pod install
2. Add LTLog.h and LTLog.m into your project
3. Append #import "LTLog.h" to your ***-Prefix.pch
4. Install XcodeColor: https://github.com/robbiehanson/XcodeColors
5. Add an environment variable to your debug scheme XcolorColors and set its value to YES
   

nice

赞

貌似Xcode6.1不输出了

我更新了一下，现在在 Xcode 6.3 里也能用。