Wednesday, August 18, 2010

The Funny Thing About Old Code…

Posted by Hidayat Hidayat at 4:57 PM
The funny thing about old code, and most new code, is that there's usually room for improvement. Shortly after posting NSString appendToFile:usingEncoding:, I realized I could've kill two birds with one stone by adding a category method on NSData and then calling that method from the NSString category method. That way I'd get the functionality on both classes without repeating logic.

Without further ado:

#import <Foundation/Foundation.h>

@interface NSData(MCFileAppend)
- (BOOL)appendToFile:(NSString *)path;
@end

@implementation NSData(MCFileAppend)
- (BOOL)appendToFile:(NSString *)path
{
NSFileHandle *fh = [NSFileHandle fileHandleForWritingAtPath:path];
if (fh == nil)
return [self writeToFile:path atomically:YES];

[fh truncateFileAtOffset:[fh seekToEndOfFile]];

[fh writeData:self];
[fh closeFile];
return YES;
}

@end

#pragma mark -
@interface NSString(MCFileAppend)
- (BOOL)appendToFile:(NSString *)path usingEncoding:(NSStringEncoding)encoding;
@end

@implementation NSString(MCFileAppend)
- (BOOL)appendToFile:(NSString *)path usingEncoding:(NSStringEncoding)encoding
{
NSData *encoded = [self dataUsingEncoding:encoding];
return [encoded appendToFile:path];
}

@end

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