Controller.m
/* |
File: Controller.m |
Abstract: Simple NSUserDefaults example program that reads/writes a preference and shows how to make a window's position and size persistent. |
Version: 1.2 |
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*/ |
#import "Controller.h" |
@implementation Controller |
#define defaultValue @"Default" |
#define myKey @"My String" |
/* Called when the app has finished launching and is ready to start running. |
This happens because in IB the delegate of the app is set to be this object. |
*/ |
- (void)applicationDidFinishLaunching:(NSNotification *)notification { |
// One of the things we do is to read the last value recorded from userdefaults |
// and set that as the value of the textfield. We have a handle to the textfield |
// (myTextField) because it is set up as an outlet in InterfaceBuilder. |
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; |
NSString *val = [defaults stringForKey:myKey]; |
if (val == nil) val = defaultValue; |
[myTextField setStringValue:val]; |
// Another thing we do is make the location of the default window also |
// get stored in defaults. This is handled simply handled by telling the window |
// what key to look for, and everything else is automatic! |
[myWindow setFrameAutosaveName:@"My Window"]; |
// Now show the window... (By default we've set it in IB not to be visible at start) |
[myWindow makeKeyAndOrderFront:nil]; |
} |
/* This method is called when a new value is entered into the textfield. |
*/ |
- (void)textFieldAction:(id)sender { |
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; |
NSString *val; |
// Get the new value from the textfield |
val = [myTextField stringValue]; |
// If it's the default value, remove from preferences; otherwise set the new value |
// We don't need to do this, but it keeps preferences cleaner, and the default value |
// is more implicit this way (in case it ever changes, the old default value won't |
// have been hardwired). |
if ([val isEqualToString:defaultValue]) { |
[defaults removeObjectForKey:myKey]; |
} else { |
[defaults setObject:val forKey:myKey]; |
} |
// Note that we don't synchronize with the file system or anything; this will happen |
// when the app quits. There are times when an explicit synchronize might be necessary, |
// but often it's not. Synchronizing unecessarily can also be a performance issue. |
} |
@end |
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