ios - postNotificationName 是否保证立即发送给监听者？

Question

如果我愿意

[[NSNotificationCenter defaultCenter] postNotificationName:@"N" object:self];
NSLog(@"here");

在执行NSLog(@"here");之前，会同步通知观察者...如果所有对象都在同一个线程上，是否保证同步执行(立即)？

找不到明确说明的内容

Answer 1

是的，虽然埋得很好:

Using the NSNotificationCenter’s postNotification: method and its variants, you can post a notification to a notification center. However, the invocation of the method is synchronous: before the posting object can resume its thread of execution, it must wait until the notification center dispatches the notification to all observers and returns.

来源:

https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/Notifications/Articles/NotificationQueues.html