ios writable directory

WritableDirectory.h

#import <Foundation/Foundation.h>

@interface WritableDirectory : NSObject

+ (NSString*)getDir;

@end

WritableDirectory.m

#import "WritableDirectory.h"

@implementation WritableDirectory

+ (NSString*)getDir{
    static bool _createdWritableDir = true;
    static NSString * _writableDirectory = NULL;
    NSFileManager * fileManager = [NSFileManager defaultManager];
    if(_createdWritableDir) {
        _createdWritableDir = false;
        NSString * version = [[UIDevice currentDevice] systemVersion];
        if([version isEqualToString:@"5.0"]) {
            _writableDirectory = [[NSHomeDirectory() stringByAppendingPathComponent:@"/Library/Caches"] copy];
        } else if([version floatValue] >= 5.0) {
            _writableDirectory = [[NSHomeDirectory() stringByAppendingPathComponent:@"/Documents/NoBackup/"] copy];
            [fileManager createDirectoryAtPath:_writableDirectory withIntermediateDirectories:true attributes:nil error:nil];
            const char * attrName = "com.apple.MobileBackup";
            uint8_t attrValue = 1;
            setxattr([_writableDirectory UTF8String],attrName,&attrValue,sizeof(attrValue),0,0);
        } else {
            _writableDirectory = [[NSHomeDirectory() stringByAppendingPathComponent:@"/Documents/NoBackup/"] copy];
            [fileManager createDirectoryAtPath:_writableDirectory withIntermediateDirectories:true attributes:nil error:nil];
        }
    }
    return _writableDirectory;
}


@end