Tagged Questions
1
vote
1answer
37 views
uninitialized extern NSString usage
In the following class:
MGTileMenu
various extern NSString's are defined in the following way for use as notifications:
.h
extern NSString *MGTileMenuWillDisplayNotification; // menu will be shown
...
0
votes
7answers
77 views
-[__NSCFString stringInISO8601Format]: unrecognized selector sent to instance [closed]
I create one extern NSString* select_new and initialize it in main() class.
NSString* select_new = @"new_car";
but when I use it
[carObject getCar:[[self ...
0
votes
1answer
98 views
Extern inheritance duplicate symbol errors, what is going on?
I have a question about the use of extern and inheritance. I'm coding an iOS app in Objective C using X-Code.
I have two hypothetical classes B and C which both inherit from class A.
Now class A ...
0
votes
2answers
176 views
Equivalent of public static final variables
I understand that placing the word extern before a variable declaration in a header file declares the existence of a global static variable without initialising it. I also understand that if I import ...
1
vote
2answers
85 views
Xcode: extern causing Linker error
Seems to be almost a duplicate of this question, but the answer there hasn't addressed the problem.
first.h
extern PlanningDocumentService *folderService;
first.m
#import first.h
- ...
0
votes
1answer
94 views
C++ Standard regarding external linkage and calling conventions
I've read the last C++11 draft (n3337 - is it the last one?), and I got a question for a possible implementation I've been working on.
Let's say we have this code:
extern "Objective C" {
class ...
0
votes
2answers
91 views
When & where to initialize extern variables from arbitrary message return values?
The project I am working on stores some constant strings like this:
(.h)
extern NSURL *kURLLocationComputer;
And I need to initialize them as follows:
(.mm)
NSURL *kURLLocationComputer;
... {
...
2
votes
1answer
124 views
Objective-C – access extern const with a string containing its name?
I have a constant defined out of class in SomeClass.h:
extern NSString *const SCImportantString;
@interface SomeClass
@end
And assign it in SomeClass.m:
NSString *const SCImportantString = @"All ...
1
vote
2answers
98 views
Accesing global variable giving linker error in objective C
I have declared a global variable like below
extern NSString *name;
@interface viewcontrollerOne{}
in implementation file i am accessing that global variable in some method like
-(void)someMethod
...
2
votes
1answer
1k views
type name does not allow storage class to be specified
@interface Foo : NSObject
{
extern int gGlobalVar;
int i;
}
-(void)setgGlobalVar:(int)val;
@end
@implementation Foo
-(void)setgGlobalVar:(int)val
{
i = 5;
NSLog(@"i = %i", ...
8
votes
2answers
904 views
Static, extern and inline in Objective-C
What do static, extern and inline (and their combinations) mean in Objetive-C using the LLVM compiler?
Also, I noticed that there are CG_EXTERN and CG_INLINE macros. Should we be using those instead?
...
2
votes
2answers
284 views
setting NSMutableArray Global variable
I want a NSMutableArray global. I have the following setup:
code.h
extern NSMutableArray *global
@interface
@end
code.m
NSMutableArray *global=nil;
@implementation
...
global=variable_mutablearray; ...
0
votes
1answer
47 views
extern passing data from one instance to another of a different class
I have the following code in objective C:
class1.h:
...
extern NSString global;
...
class1.m:
...
NSString *global;
@implementation:
..
-dostuff{
global=@"hi";
}
..
@end
...
1
vote
1answer
365 views
Objective-C extern and typedef undefined symbols
I am new to objective-c. I have the following:
@interface HPSEnumerations : NSObject
typedef NSString* HPS_FORMELEMENTTYPE;
extern HPS_FORMELEMENTTYPE Textfield;
extern HPS_FORMELEMENTTYPE Label;
...
40
votes
1answer
2k views
“FOUNDATION_EXPORT” vs “extern”
I would like to ask what's the reason behind using FOUNDATION_EXPORT instead of extern in Objective C projects.
I've checked this question and using FOUNDATION_EXPORT has earned whopping 340 points ...
0
votes
1answer
145 views
Passing an NSString to another view controller crashes the app
I have the following code where I am passing the value of buttonString (an NSString) to another view controller. the app crashes when buttonString = imageName; is set and then called on the other view ...
1
vote
2answers
235 views
Trying to use extern int, told it's now a pointer
I've declared this little guy in the Constants.h file of my project:
extern int *exitDirection;
Then, I set him to an integer. In this case, it was 881, which is a very nice number.
Now, I want to ...
3
votes
1answer
1k views
How to use static variable(BOOL) in Objective C
I am from C# background, and I am having a hard time in figuring out about how to use a static variable(BOOL in my case) in Objective C.
My questions are:
Where should I declare my static variable. ...
0
votes
1answer
162 views
Duplicate symbol caused by inline extern
FMParallaxChild.h
typedef struct {
// ...
} FMParallaxSetting;
inline extern FMParallaxSetting FMParallaxSettingMake(CGPoint ratio, CGPoint startPos, CGPoint offset, CGPoint relVel, int zOrder);
...
2
votes
2answers
619 views
Objective-c extern variables changes
Please help, I'm stuck with objective-c global variables aka extern!
I writing my first iOS app it is a game, so to save my progress I wrote some global variables in Globals.h:
@interface Globals : ...
0
votes
1answer
340 views
Is it true to use extern to access variables from other classes in Objective c?
i have a DetailViewController and a Messages class(this is a TableViewController class). I parse some web information in the first class and want to use some values amongst them in the second class. ...
1
vote
3answers
684 views
Difference between external variable of some sort and static variable
What the difference between external variable of some sort and static variable?
//ClassA.m
NSString *var1;
static NSString *var2;
@implementation ClassA
...
7
votes
4answers
5k views
Objective-C static, extern, public variables
I want to have a variable that I can access anywhere by importing a header file but I also want it to be static in the sense that there is only one of them created. In my .m file, I specify
static ...
0
votes
2answers
2k views
Linker error using extern “C” in Objective-C code
I'm trying to create some utility functions that can be called from both Objective-C and C++ code in an iPhone application. I have third party C++ classes that cannot be compiled as ObjectiveC++ ...
7
votes
2answers
1k views
3 questions about extern used in a Objective-C project
1
when I use the word "extern" before a method or variable declaration, am I making it global and therefore readable/writable/usable over the entire project ?
2
If I use extern before a keyword, is ...
7
votes
1answer
2k views
“extern const” vs “extern” only
I've seen 2 ways of creating global variables, what's the difference, and when do you use each?
//.h
extern NSString * const MyConstant;
//.m
NSString * const MyConstant = @"MyConstant";
and
//.h
...
3
votes
3answers
2k views
External Constants for UIColor, UIFont, etc
I have a constants.m file that is a centralized collection of many program constants. To set a color, I do this:
@implementation UIColor (UIColor_Constants)
+(UIColor *) ...
2
votes
2answers
459 views
Linking External Constants — Objective C
In an earlier answer about external constants, the preferred answer says
"Constants.m should be added to your application/framework's target so
that it is linked in to the final product."
I am ...
1
vote
2answers
341 views
Mysterious problem with Extern
In my project I've AuxState.h where I define
extern NSString *kStrAgentStateLogin;
extern NSString *kStrAgentStateAvailable;
extern NSString *kStrAgentStateLogOff;
extern NSString ...
0
votes
2answers
165 views
Calling external method actually calls other method
I must be asleep already or something because I'm seeing weird things.
I've got a class, called ListSorter (.h/.m), which has 2 extern methods.
The .h looks like:
@interface ListSorter : NSObject ...
