NSFileManager in IOS - ios

Question

- (void)viewDidLoad
{
[super viewDidLoad];
NSFileManager * fileManager =[[NSFileManager alloc]init];
NSArray *Apath=[fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask];
NSString *FilePath=[[Apath objectAtIndex:0] absoluteString];
NSString *TEST =[FilePath stringByAppendingPathComponent:#"test10.txt"];
BOOL flage =[[NSFileManager defaultManager] fileExistsAtPath:TEST];
if (flage)
{
NSLog(#"It's exist ");
}
else
{
NSLog(#"It is not here yet ");
NSData * data =[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:#"www.google.com"]];
[data writeToFile:TEST atomically:YES];
}
}
I'm just trying to create a text file , it always give me "It is not here yet"
Anything wrong with the code ??

Answer 1

You haven't created a file, you have only created a file path: you need to write a file to that path.
//after these lines ... (I've improved your variable names)
NSArray *paths=[fileManager URLsForDirectory:NSDocumentDirectory
inDomains:NSUserDomainMask];
NSString *filePath=[[paths objectAtIndex:0] absoluteString];
filePath =[filePath stringByAppendingPathComponent:#"test10.txt"];
//try this
NSString* fileContent = #"some text to save in a file";
BOOL success = [fileContent writeToFile:filePath
atomically:YES
encoding:NSUTF8StringEncoding
error:nil]
But watch out - file existence tests come with a warning from Apple:
Note: Attempting to predicate behavior based on the current state of the file system or a particular file on the file system is not recommended. Doing so can cause odd behavior or race conditions. It's far better to attempt an operation (such as loading a file or creating a directory), check for errors, and handle those errors gracefully than it is to try to figure out ahead of time whether the operation will succeed.