通過目標C的NSNotificationCenter發送和接收消息？我試圖通過NSNotificationCenter目標-C。然而，我還沒有找到任何關于如何做到這一點的例子。您如何通過NSNotificationCenter?
3 回答
12345678_0001
TA貢獻1802條經驗 獲得超5個贊
@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- (void) someMethod{
// All instances of TestClass will be notified
[[NSNotificationCenter defaultCenter]
postNotificationName:@"TestNotification"
object:self];}
holdtom
TA貢獻1805條經驗 獲得超10個贊
NSDictionary *userInfo = [NSDictionary dictionaryWithObject:myObject forKey:@"someKey"];[[NSNotificationCenter defaultCenter] postNotificationName: @"TestNotification" object:nil userInfo:userInfo];
- (void) receiveTestNotification:(NSNotification *) notification {
NSDictionary *userInfo = notification.userInfo;
MyObject *myObject = [userInfo objectForKey:@"someKey"];}- 3 回答
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