moveItemAtPath. No errors, but not working - objective-c

Question

Im trying to move files. Below I'm testing if the paths exist. They do, however both copyItemAtPath and moveItemAtPath don't seem to work.
NSString *testUrl = #"/Users/justinshulman/Documents/test2";
if ([[NSFileManager defaultManager]fileExistsAtPath:testUrl]) {
NSLog(#"yes");
}
NSString *testUrl2 = #"/Users/justinshulman/Documents/test1";
if ([[NSFileManager defaultManager]fileExistsAtPath:testUrl2]) {
NSLog(#"yes");
}
NSLog(#"%#",testUrl);
NSLog(#"%#",testUrl2);
[[NSFileManager defaultManager]copyItemAtPath:testUrl2 toPath:testUrl error:nil];
[[NSFileManager defaultManager]moveItemAtPath:testUrl2 toPath:testUrl error:nil];

Answer 1

That is exactly your problem, both move and copy will not actually overwrite the destination file if it already exists. You'll have to remove it first and then copy (or move) the other file to that URL.
Try with
[[NSFileManager defaultManager] removeItemAtPath:testUrl error:nil];
[[NSFileManager defaultManager]copyItemAtPath:testUrl2 toPath:testUrl error:nil];
and it should work fine.

Answer 2

You should also be checking for the error instead of passing nil.
NSError* error = nil;
[[NSFileManager defaultManager]copyItemAtPath:testUrl2 toPath:testUrl error:&error];
if (error != nil) {
NSLog(#"%#", [error localizedDescription]);
}
It also returns a bool on whether the copy was successful.
Adding to #micantox answer, always read the class reference. See class reference for NSFileManager:
If a file with the same name already exists at dstPath, this method
aborts the copy attempt and returns an appropriate error.

Answer 3

You should pass NSError object in error filed.
[[NSFileManager defaultManager]copyItemAtPath:testUrl2 toPath:testUrl error:&error];
Error Domain=NSPOSIXErrorDomain Code=17 UserInfo=0x100457e80 "The operation couldn’t be completed.
[[NSFileManager defaultManager]moveItemAtPath:testUrl2 toPath:testUrl error:&error];
Error Domain=NSCocoaErrorDomain Code=512 UserInfo=0x1004a2270
Use replaceItemAtURL:withItemAtURL:backupItemName:options:resultingItemURL:error:
Replaces the contents specified by the first URL with the contents of
the second URL in a manner that insures no data loss occurs.

Answer 4

#justin, First thing it never works only. Because you are trying to copy the source path to destination path where both path are same. Second thing, how NSFileManager copy or move api works is, you have to copy or move source path to different destination path with appending your appropriate path component. For example see the code below:--
NSString *testUrl = #"/Users/home/Documents/source.rtf";
//
if ([[NSFileManager defaultManager]fileExistsAtPath:testUrl]) {
NSLog(#"yes");
}
//Below destination is folder name which should be exist on your machine or else you can create programmatically as well
NSString *testUrl2 = #"/Users/home/Documents/destination";
NSLog(#"%#",testUrl);
NSLog(#"%#",testUrl2);
NSError *err=nil;
//Now we are copying the souce path to destination folder with appending file name (it can be any your name becuase file manager copy source file contents to your destination file contents)
//Here given file name is a destination.rtf where you can give any your name. Also this is for copying source contents to destination contents
NSFileManager *fm=[NSFileManager defaultManager];
if ([fm copyItemAtPath:testUrl toPath:[testUrl2 stringByAppendingPathComponent:#"destination.rtf"] error:&err])
{
NSLog(#"success");
}
else
{
NSLog(#"%#",[err localizedDescription]);
}