No visible #interface for 'BinaryFileReader' declares the selector 'initWithLocation:' - ios

Question

I am having an this error come up:
No visible #interface for 'BinaryFileReader' declares the selector 'initWithLocation:'
for every method called on BinaryFileReader in the method below.
+ (Item*)loadItem:(NSString*)filepath {
Item* newItem = [[Item alloc] init];
BinaryFileReader* input = [[BinaryFileReader alloc] initWithLocation:filepath];
[newItem setName:[input readNSString]];
[newItem setOtherNames:[input readNSMutableArrayOfNSString]];
[newItem setDescription:[input readNSString]];
[newItem setXactCode:[input readNSString]];
[newItem setSymbilityCode:[input readNSString]];
[newItem setAverageLowPrice:[input readInt]];
[newItem setAverageHighPrice:[input readInt]];
[newItem setAverageLifeExpectancy:[input readInt]];
return newItem;
}
Here is my BinaryFileReader.m:
#import "BinaryFileReader.h"
#implementation BinaryFileReader
- (id)init {
self = [super init];
return self;
}
- (id)initWithLocation:(NSString*)filepath {
if ((self = [super init])) {
_file = [NSFileHandle fileHandleForReadingAtPath:filepath];
_fileOffset = 0;
if (_file == nil)
NSLog(#"%#%#",#"Failed to open file at path:",filepath);
}
return self;
}
- (void)close {
[_file closeFile];
}
- (int)readInt {
[_file seekToFileOffset:_fileOffset];
_databuffer = [_file readDataOfLength:4];
_fileOffset+=4;
return (*(int*)([_databuffer bytes]));
}
- (NSString*)readNSString {
int length = [self readInt];
[_file seekToFileOffset:_fileOffset];
_databuffer = [_file readDataOfLength:length];
_fileOffset+=length;
return [[NSString alloc] initWithData:_databuffer encoding:NSUTF8StringEncoding];
}
- (NSMutableArray*)readNSMutableArrayOfNSString {
NSMutableArray* array = [[NSMutableArray alloc] init];
int arrayLength = [self readInt];
int length;
for (int i=0; i<arrayLength; i++) {
length = [self readInt];
[_file seekToFileOffset:_fileOffset];
_databuffer = [_file readDataOfLength:length];
_fileOffset+=length;
[array addObject:[[NSString alloc] initWithData:_databuffer encoding:NSUTF8StringEncoding]];
}
return array;
}
#end
And BinaryFileReader.h:
#interface BinaryFileReader : NSObject
#property (nonatomic) int fileOffset;
#property (nonatomic, retain) NSData* databuffer;
#property (nonatomic, retain) NSFileHandle* file;
- (id)init;
- (id)initWithLocation:(NSString*)filepath;
- (void)close;
- (int)readInt;
- (NSString*)readNSString;
- (NSMutableArray*)readNSMutableArrayOfNSString;
#end
I don't understand why I am having this issue. Any help to clear this up would be much appreciated.

Answer 1

I copy&pasted the code from your question into a project of mine. Expected result: Everything compiles fine. So it's definitely not your code that is the problem.
Coming back to the idea of a different BinaryFileReader.h polluting your #imports: Do you use any third party libraries in your project? If yes, one of those might unexpectedly provide a BinaryFileReader.h file.
Try this: Rename BinaryFileReader.h to something else, e.g. Foo.h. Also change the #import in BinaryFileReader.m to use Foo.h, but leave the #import in the file where your loadItem: method is located so that it still uses BinaryFileReader.h. Now compile again. The compiler should now complain that it can't find BinaryFileReader.h. If the error is still about the missing selector then you know that somewhere you have an unexpected BinaryFileReader.h messing up your project.