Hack to choose the displayed carrier name in the iOS simulator

XCDFakeCarrier.m

//
// Copyright (c) 2012-2015 Cédric Luthi / @0xced. All rights reserved.
//

#import <Foundation/Foundation.h>

#if TARGET_OS_SIMULATOR

static const char *fakeCarrier;
static const char *fakeTime;

#import <objc/runtime.h>

@interface XCDFakeCarrier : NSObject
@end

@implementation XCDFakeCarrier

/*
  Runtime offsets for the -[UIStatusBarComposedData rawData] struct
  struct {
    BOOL itemIsEnabled[27];
    BOOL timeString[64];
    int gsmSignalStrengthRaw;
    int gsmSignalStrengthBars;
    BOOL serviceString[100];
    ...
  }
 
  See https://github.com/nst/iOS-Runtime-Headers/blob/master/Frameworks/UIKit.framework/UIStatusBarComposedData.h
*/
static NSUInteger timeStringOffset;
static NSUInteger timeStringSize;
static NSUInteger gsmSignalStrengthBarsOffset;
static NSUInteger gsmSignalStrengthBarsSize;
static NSUInteger serviceStringOffset;
static NSUInteger serviceStringSize;

+ (void) load
{
	fakeCarrier = getenv("FAKE_CARRIER");
	if (!fakeCarrier)
	{
		NSLog(@"You must set the FAKE_CARRIER environment variable");
		return;
	}
	fakeTime = getenv("FAKE_TIME");
	
	const Class UIStatusBarComposedData = objc_getClass("UIStatusBarComposedData");
	const Method rawData = class_getInstanceMethod(UIStatusBarComposedData, sel_getUid("rawData"));
	const char *typeEncoding = method_getTypeEncoding(rawData);
	
	if (typeEncoding)
	{
		NSRegularExpression *typeEncodingRegularExpression = [NSRegularExpression regularExpressionWithPattern:@"\\^(\\{\\?=\\[\\d+[Bc]\\]\\[\\d+c\\]ii\\[\\d+c\\])" options:(NSRegularExpressionOptions)0 error:NULL];
		NSString *typeEncodingString = @(typeEncoding);
		NSTextCheckingResult *typeEncodingMatch = [typeEncodingRegularExpression firstMatchInString:typeEncodingString options:(NSMatchingOptions)0 range:NSMakeRange(0, typeEncodingString.length)];
		if (typeEncodingMatch.numberOfRanges > 1)
		{
			NSString *partialTypeEncoding = [[typeEncodingString substringWithRange:[typeEncodingMatch rangeAtIndex:1]] stringByAppendingString:@"}"];
			NSMethodSignature *methodSignature = [NSMethodSignature signatureWithObjCTypes:partialTypeEncoding.UTF8String];
			NSString *parsedTypeEncoding = methodSignature.debugDescription;
			NSRegularExpression *parsedTypeEncodingRegularExpression = [NSRegularExpression regularExpressionWithPattern:@"^            memory \\{offset = (\\d+), size = (\\d+)\\}" options:NSRegularExpressionAnchorsMatchLines error:NULL];
			NSArray<NSTextCheckingResult *> *offsetMatches = [parsedTypeEncodingRegularExpression matchesInString:parsedTypeEncoding options:(NSMatchingOptions)0 range:NSMakeRange(0, parsedTypeEncoding.length)];
			if (offsetMatches.count == 5)
			{
				timeStringOffset =            [[parsedTypeEncoding substringWithRange:[offsetMatches[1] rangeAtIndex:1]] integerValue];
				timeStringSize =              [[parsedTypeEncoding substringWithRange:[offsetMatches[1] rangeAtIndex:2]] integerValue];
				gsmSignalStrengthBarsOffset = [[parsedTypeEncoding substringWithRange:[offsetMatches[3] rangeAtIndex:1]] integerValue];
				gsmSignalStrengthBarsSize =   [[parsedTypeEncoding substringWithRange:[offsetMatches[3] rangeAtIndex:2]] integerValue];
				serviceStringOffset =         [[parsedTypeEncoding substringWithRange:[offsetMatches[4] rangeAtIndex:1]] integerValue];
				serviceStringSize =           [[parsedTypeEncoding substringWithRange:[offsetMatches[4] rangeAtIndex:2]] integerValue];
				
				BOOL isTimeStringOK = timeStringOffset > 0 && timeStringSize > 0;
				BOOL isSignalStrengthBarsOK = gsmSignalStrengthBarsOffset > 0 && gsmSignalStrengthBarsSize == sizeof(int);
				BOOL isServiceStringOK = serviceStringOffset > 0 && serviceStringSize > 0;
				if (isTimeStringOK && isSignalStrengthBarsOK && isServiceStringOK)
				{
					const SEL fakeSelector = @selector(fake_rawData);
					const Method fakeRawData = class_getInstanceMethod(self, fakeSelector);
					if (class_addMethod(UIStatusBarComposedData, fakeSelector, method_getImplementation(fakeRawData), typeEncoding))
					{
						method_exchangeImplementations(rawData, class_getInstanceMethod(UIStatusBarComposedData, fakeSelector));
						NSLog(@"Using \"%s\" fake carrier", fakeCarrier);
						return;
					}
				}
			}
		}
	}
	
	NSLog(@"XCDFakeCarrier failed to initialize");
}

- (void *) fake_rawData
{
	char *rawData = [self fake_rawData];
	
	BOOL isEmptyCarrier = [@(fakeCarrier ?: "") stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]].length == 0;
	BOOL isEmptyTime = [@(fakeTime ?: "") stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]].length == 0;
	
	if (isEmptyCarrier && isEmptyTime)
	{
		bzero(rawData, serviceStringOffset + serviceStringSize);
		return rawData;
	}
	
	strlcpy(rawData + serviceStringOffset, fakeCarrier, serviceStringSize);
	
	if (fakeTime)
		strlcpy(rawData + timeStringOffset, fakeTime, timeStringSize);
	
	int gsmSignalStrengthBars = 5;
	memcpy(rawData + gsmSignalStrengthBarsOffset, &gsmSignalStrengthBars, gsmSignalStrengthBarsSize);
	
	BOOL enableSignalBars = YES;
	memcpy(rawData + 3, &enableSignalBars, sizeof(enableSignalBars));

	BOOL enableBatteryLevelPercentage = YES;
	memcpy(rawData + 8, &enableBatteryLevelPercentage, sizeof(enableBatteryLevelPercentage));
	
	/*
	  0  center  Time
	  1  right   Do not Sisturb
	  2  left    Airplane
	  3  left    Signal Bars
	  4  left    Carrier
	  5  left    Wi-Fi
	  6  right   Time
	  7  right   Battery Logo
	  8  right   Battery Level Percentage
	  9  right   Battery Level Percentage
	 10  right   Bluetooth Battery
	 11  right   Bluetooth
	 12  right   TTY
	 13  right   Alarm
	 14  right   Plus
	 15          unknown
	 16  right   Location Service
	 17  right   Rotation Lock
	 18          unknown
	 19  right   AirPlay
	 20  right   Siri
	 21  left    Play
	 22  left    VPN
	 23  left    Call Forward
	 24  left    Network Activity Indicator
	 25  left    Black Square
	*/
	return rawData;
}

@end

#endif

Nice for taking screenshots or recording screencasts. Does even run on device!

Doesn't work on iOS Simulator 6.0, at least for me. (Failed to initialize).

It is now working on iOS 6.0 and 6.1.

Nice job on this, great hack.

Perfect, thanks for this!

I'm getting this error ld: 2 duplicate symbols for architecture i386, any ideas>

Never mind, I ended up putting some code into a h file and imported that into my app delegate which solved the problem :)

Hi, this is awesome, but I can't figure out how to display the cellular bar strength and eliminate the WiFi signal Icon. Anyone have insight?

Thanks!

A rough example of how to customize other parts of the status bar is available here: https://github.com/ksuther/StatusBarCustomization

I recommend taking a look at a cleaner solution: http://stackoverflow.com/questions/12580694/how-to-customize-carrier-name-in-ios-6-simulator

Looks like this broke with iOS 8.3.

@mpvoseller
Replace statusBarDataInfo with the below & it should work in 8.3 :)

NSDictionary *statusBarDataInfo = @{ @"^{?=[26c][64c]ii[100c]": @"fake_rawData",
                                         // use B instead of c for 64-bit
                                         @"^{?=[26B][64c]ii[100c]": @"fake_rawData" };

It’s working again for iOS 8 and 9 and should even be future proof now!

how to make it work on iPhone 6s? It tried to make it 64 bit like:

NSDictionary *statusBarDataInfo = @{ @"^{?=[25B][64B]ii[100B]": @"fake_rawData",
                                     // use B instead of c for 64-bit
                                     @"^{?=[25B][64c]ii[100c]": @"fake_rawData" };

but didn't work :(

@Pranoy1c It’s not about the iPhone 6S, it’s about the iOS version. Please try updating to the latest version of the gist.

Any update for iOS 11?

does it still work?

https://github.com/shinydevelopment/SimulatorStatusMagic