NSNotificationCenter 用法

2015/11/04 39492

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一个简单的使用 NSNotificationCenter 的代码例子

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@implementation TestClass
 
- (void) dealloc
{
    // If you don't remove yourself as an observer, the Notification Center
    // will continue to try and send notification objects to the deallocated
    // object.
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [super dealloc];
}
 
- (id) init
{
    self = [super init];
    if (!self) return nil;
 
    // Add this instance of TestClass as an observer of the TestNotification.
    // We tell the notification center to inform us of "TestNotification"
    // notifications using the receiveTestNotification: selector. By
    // specifying object:nil, we tell the notification center that we are not
    // interested in who posted the notification. If you provided an actual
    // object rather than nil, the notification center will only notify you
    // when the notification was posted by that particular object.
 
    [[NSNotificationCenter defaultCenter] addObserver:self
        selector:@selector(receiveTestNotification:)
        name:@"TestNotification"
        object:nil];
 
    return self;
}
 
- (void) receiveTestNotification:(NSNotification *) notification
{
    // [notification name] should always be @"TestNotification"
    // unless you use this method for observation of other notifications
    // as well.
 
    if ([[notification name] isEqualToString:@"TestNotification"])
        NSLog (@"Successfully received the test notification!");
}
 
@end
 
//... somewhere else in another class ...
- (void) someMethod
{
    // All instances of TestClass will be notified
    [[NSNotificationCenter defaultCenter]
        postNotificationName:@"TestNotification"
        object:self];
}