Convert NSString to int Decimal Value ,iOS

-(void)FunTest
 NSString* mDataStaring = @"1234";
 NSString *subStr =@"";
 NSUInteger tlen=mDataStaring.length;
 for(int i=0;i<tlen;i=i+2)
 subStr = [mDataStaring substringWithRange:NSMakeRange(i, 2)];
 int value=[self Fun_ConvertStringToInt:subStr];
 NSLog(@"value=%d\n", value);
 


-(int)Fun_ConvertStringToInt:(NSString*)iDataStaring
 NSData* theData=[self bytesStringToData:iDataStaring];
 
 int *values = [theData bytes];
 NSUInteger cnt = [theData length];
 return values[0];

-(NSData*)bytesStringToData:(NSString*)bytesString

Convert NSString to int Decimal Value ,iOS