Very short trick: come usare NSFileManager

Apple consiglia di utilizzare l’istanza dell’oggetto NSFileManager e non il suo meotodo di classe defaultManager, in quanto quest’ultimo restituisce un’instanza singleton, cioè sempre lo stesso puntatore ad oggetto (non thread safe).

In Mac OS X v 10.5 and later you should consider using [[NSFileManager alloc] init] rather than the singleton method defaultManager. Using [[NSFileManager alloc] init] instead, the resulting NSFileManager instance is thread safe.

In pratica:

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// Sconsigliato
BOOL result = [[NSFileManager defaultManager] fileExistsAtPath:pathLocalRepository isDirectory:nil];

// Consigliato
NSFileManager *fm = [[NSFileManager alloc] init];
BOOL result = [fm fileExistsAtPath:pathLocalRepository isDirectory:nil];
[fm release];
fm = nil;

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