Hi,
I've been playing around with bindings to NSUserDefaultsController in
a very simple app to test saving preferences, but the
[sharedUserDefaultsController save:self] method seems to return
immediately without waiting for the save operation to complete.
The save does actually take place, which I can see if I open the
plist file in Property List Editor, but if the very next line after
sending the save message is one which reads a property from the
plist, it's the old value which gets returned rather than the newly
saved one.
My test app consists of only one window with a slider (whose value is
bound to the Shared User Defaults Controller), and three buttons: one
connected to savePrefs, one to revertPrefs, and one to checkValue
which prints out the slider's value as stored within the model.
Here's the entire code:
-(id)init {
[super init];
[[NSUserDefaultsController sharedUserDefaultsController]
setAppliesImmediately:NO];
myPrefs = [NSUserDefaults standardUserDefaults];
[self readPrefs];
return self;
}
-(void) readPrefs{
//[myPrefs synchronize]; //this line doesn't make any difference
theValue = [myPrefs objectForKey:@"thevalue"];
}
-(void) savePrefs:(NSObject *) sender{
// save prefs and close the window
[[NSUserDefaultsController sharedUserDefaultsController] save:self];
[self readPrefs];
}
-(void) checkValue:(NSObject *) sender{
NSLog(@"value is %@",theValue);
}
-(void) revertPrefs:(NSObject *) sender{
// revert and close the window
[[NSUserDefaultsController sharedUserDefaultsController]
revert:sender];
}
If I move [self readPrefs] out of the savePrefs method and into
checkValue, it prints the new value as expected - but I don't want to
be reading the preferences every time I need to use that particular
variable. Can someone explain the right way to do this please?
For what it's worth, I also get these compiler warnings for the line
with [sharedUserDefaultsController save:]
warning: multiple methods named '-save:' found
warning: using '-(void)save:(id)sender'
warning: also found '-(BOOL)save:(NSError **)error'
Thanks
Mark
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