iOS gets a string String’s different or value

#import 

NS_ASSUME_NONNULL_BEGIN

@interface HKXORManager: NSObject

+ (HKXORManager *)shareManager;
/**
 * Calculate the XOR value
 * @param string The string that needs to be XORed
 * @return Get the string after XOR
 */
-(NSString *)stringXOR:(NSString *)string;

@end

NS_ASSUME_NONNULL_END

#import "HKXORManager.h"



@implementation HKXORManager



+ (HKXORManager *)shareManager {

 static HKXORManager *instance = nil;

 static dispatch_once_t onceToken;

 dispatch_once(&onceToken, ^{

 instance = [[HKXORManager alloc] init];

 });

 return instance;

}



- (NSString *)stringXOR:(NSString *)string {

 if (string.length%2) {

 string = [NSString stringWithFormat:@"0%@", string span>];

}

 NSString *code = @"00";

 for (int i=0; i<string.length; i=i+ 2) {

 NSString *subString = [string substringWithRange:NSMakeRange(i, 2< /span>)];

 code = [self pinxCreator:code withPinv:subString];

}

 return code;

}



- (NSString *)pinxCreator:(NSString *)pan withPinv:(NSString *)pinv {

 if (pan.length != pinv.length) {

 return nil;

}

 const char *panchar = [pan UTF8String];

 const char *pinvchar = [pinv UTF8String];

 NSString *temp = [[NSString alloc] init];

 for (int i = 0; i ) {

 int panValue = [self charToint:panchar[i]];

 int pinvValue = [self charToint:pinvchar[i]];

 temp = [temp stringByAppendingString:[NSString stringWithFormat:@"%X ",panValue^pinvValue]];

}

 return temp;

}



- (int)charToint:(char)tempChar {

 if (tempChar >= '0' && tempChar <='9') {

 return tempChar-'0';

}

 else if (tempChar >= 'A' && tempChar < = 'F' span>) {

 return tempChar-'A' + 10;

}

 return 0;

}



@end

#import 

NS_ASSUME_NONNULL_BEGIN

@interface HKXORManager: NSObject

+ (HKXORManager *)shareManager;
/**
 * Calculate the XOR value
 * @param string The string that needs to be XORed
 * @return Get the string after XOR
 */
-(NSString *)stringXOR:(NSString *)string;

@end

NS_ASSUME_NONNULL_END

#import "< span style="color: #800000;">HKXORManager.h"



@implementation HKXORManager



+ (HKXORManager *)shareManager {

 static HKXORManager *instance = nil;

 static dispatch_once_t onceToken;

 dispatch_once(&onceToken, ^{

 instance = [[HKXORManager alloc] init];

 });

 return instance;

}



- (NSString *)stringXOR:(NSString *)string {

 if (string.length%2) {

 string = [NSString stringWithFormat:@"0%@", string span>];

}

 NSString *code = @"00";

 for (int i=0; i<string.length; i=i+ 2) {

 NSString *subString = [string substringWithRange:NSMakeRange(i, 2< /span>)];

 code = [self pinxCreator:code withPinv:subString];

}

 return code;

}



- (NSString *)pinxCreator:(NSString *)pan withPinv:(NSString *)pinv {

 if (pan.length != pinv.length) {

 return nil;

}

 const char *panchar = [pan UTF8String];

 const char *pinvchar = [pinv UTF8String];

 NSString *temp = [[NSString alloc] init];

 for (int i = 0; i ) {

 int panValue = [self charToint:panchar[i]];

 int pinvValue = [self charToint:pinvchar[i]];

 temp = [temp stringByAppendingString:[NSString stringWithFormat:@"%X ",panValue^pinvValue]];

}

 return temp;

}



- (int)charToint:(char)tempChar {

 if (tempChar >= '0' && tempChar <='9') {

 return tempChar-'0';

}

 else if (tempChar >= 'A' && tempChar < = 'F' span>) {

 return tempChar-'A' + 10;

}

 return 0;

}



@end