Declare a string with char data type in Objective c .m file and use it in Swift

Question

Objc file

#import "EncryptionConstants.h"

@implementation EncryptionConstants

 char encKey[] = "secretKey";
 char iv[] = "secretIV";

@end

after creating a bridging file, I am doing this in a swift file..

var enc = EncryptionConstants()
            print(enc.encKey)

Getting an error like:

value of EncryptionConstants has no member encKey.

stackoverflow.com/questions/22850548/… You are declaring a static variable. — Muhammad Zohaib Ehsan
– Muhammad Zohaib Ehsan, Commented Aug 17, 2017 at 7:48

Vini App · Accepted Answer · 2017-08-19 05:19:19Z

1

Header file like Below :

#import <Foundation/Foundation.h>

@interface EncryptionConstants: NSObject
@property unsigned char* encKey;
@property unsigned char* iv;

@end

.m file is Below :

#import <Foundation/Foundation.h>
#import "EncryptionConstants.h"

@implementation EncryptionConstants

- (instancetype)init
{
    self = [super init];
    if (self) {
        _encKey = "secretKey";
        _iv = "secretIV";
    }
    return self;
}

@end

We have to call in swift as below :

let enc = EncryptionConstants()
print(String(cString: enc.encKey))
print(String(cString: enc.iv))

Need to include

#import "EncryptionConstants.h"

in your bridging header

edited Aug 19, 2017 at 5:19

answered Aug 18, 2017 at 2:07

Vini App

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4 Comments

rhru Over a year ago

It just fixes the compilation error but the value is not being set properly. warning on the line _encKey = "secretKey"; Assigning to 'unsigned char *' from 'char [10]' converts between pointers to integer types with different sign

Vini App Over a year ago

We can change the char type to NSString

rhru Over a year ago

It is a technical requirement to have the data type as char

Vini App Over a year ago

I have updated the answer. print(String(cString: enc.encKey)) print(String(cString: enc.iv)) Please check.

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