Xcode / iOS: How to determine whether code is runn

问题:

I am making an app that processes sensitive credit card data.

If my code is running in debug mode I want to log this data to the console and make some file dumps.

However on the final appstore version (ie when it is running in release mode) it is essential all of this is disabled (security hazard)!

I will try to answer my question as best I can; so the question becomes 'Is this solution path the right or best way to do it?'

// add `IS_DEBUG=1` to your debug build preprocessor settings  

#if( IS_DEBUG )  
#define MYLog(args...) NSLog(args)  
#else  
#define MYLog(args...)  
#endif  

回答1:

Check your project's build settings under 'Apple LVM - Preprocessing', 'Preprocessor Macros' for debug to ensure that 'DEBUG' is being set - do this by selecting the project and clicking on the build settings tab. Search for 'DEBUG' and look to see if indeed DEBUG is being set.

Pay attention though. You may see DEBUG changed to another variable name such as DEBUG_MODE.

then conditionally code for DEBUG in your source files

#ifdef DEBUG

// Something to log your sensitive data here

#else

// 

#endif

回答2:

For a solution in Swift please refer to this thread on SO.

Basically the solution in Swift would look like this:

#if DEBUG
    println("I'm running in DEBUG mode")
#else
    println("I'm running in a non-DEBUG mode")
#endif

Additionally you will need to set the DEBUG symbol in Swift Compiler - Custom Flags section for the Other Swift Flags key via a -D DEBUG entry. See the following screenshot for an example:

回答3:

Apple already includes a DEBUG flag in debug builds, so you don't need to define your own.

You might also want to consider just redefining NSLog to a null operation when not in DEBUG mode, that way your code will be more portable and you can just use regular NSLog statements:

//put this in prefix.pch

#ifndef DEBUG
#undef NSLog
#define NSLog(args, ...)
#endif

回答4:

Most answers said that how to set #ifdef DEBUG and none of them saying how to determinate debug/release build.

My opinion:

1. Edit scheme -> run -> build configuration :choose debug / release . It can control the simulator and your test iPhone's code status.

2. Edit scheme -> archive -> build configuration :choose debug / release . It can control the test package app and App Store app 's code status.

回答5:

zitao xiong's answer is pretty close to what I use; I also include the file name (by stripping off the path of FILE).

#ifdef DEBUG
    #define NSLogDebug(format, ...) \
    NSLog(@"<%s:%d> %s, " format, \
    strrchr("/" __FILE__, '/') + 1, __LINE__, __PRETTY_FUNCTION__, ## __VA_ARGS__)
#else
    #define NSLogDebug(format, ...)
#endif

回答6:

In xcode 7, there is a field under Apple LLVM 7.0 - preprocessing, which called "Preprocessors Macros Not Used In Precompiled..." I put DEBUG in front of Debug and it works for me by using below code:

#ifdef DEBUG
    NSString* const kURL = @"http://debug.com";
#else
    NSString* const kURL = @"http://release.com";
#endif

回答7:

Swift and Xcode 10+

#if DEBUG will pass in ANY development/ad-hoc build, device or simulator. It's only false for App Store and TestFlight builds.

Example:

#if DEBUG
   print("Not App Store build")
#else
   print("App Store build")
#endif

回答8:

Just one more idea to detect:

DebugMode.h

#import <Foundation/Foundation.h>

@interface DebugMode: NSObject
    +(BOOL) isDebug;
@end

DebugMode.m

#import "DebugMode.h"

@implementation DebugMode
+(BOOL) isDebug {
#ifdef DEBUG
    return true;
#else
    return false;
#endif
}
@end

add into header bridge file:

#include "DebugMode.h"

usage:

DebugMode.isDebug()

It is not needed to write something inside project properties swift flags.

回答9:

Not sure if I answered you question, maybe you could try these code:

#ifdef DEBUG
#define DLOG(xx, ...)  NSLog( \
    @"%s(%d): " \
    xx, __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__ \  
    )
#else
#define DLOG(xx, ...)  ((void)0)
#endif