我需要使用

Question

https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSNotificationCenter_Class/Reference/Reference.html#//apple_ref/occ/instm/NSNotificationCenter/postNotificationName:object:userInfo的示例代碼：

postNotificationName：對象：用戶信息：

基本上如何觀察者獲取用戶信息？

是否有一個簡短的示例代碼的地方顯示整個事情？

Answer 1

#import <Foundation/Foundation.h> 

#define kSomeKey @"key" 
#define kNotificationName @"MyMadeUpNameNotification" 
@interface Test : NSObject 
@end 
@implementation Test 
-(void) handleNotification:(NSNotification*)notification { 
    NSString *object = [notification.userInfo objectForKey:kSomeKey]; 
    NSLog(@"%@",object); 
} 
-(void) run { 
    [[NSNotificationCenter defaultCenter] addObserver: self 
              selector: @selector(handleNotification:) 
               name: kNotificationName 
               object: nil]; 
    NSString *anyObject = @"hello"; 
    NSDictionary *userInfo = [NSDictionary dictionaryWithObject:anyObject forKey:kSomeKey]; 
    NSNotification *notification = [NSNotification notificationWithName:kNotificationName object:nil userInfo:userInfo]; 
    [[NSNotificationCenter defaultCenter] postNotification:notification]; 
} 
@end 


int main(int argc, char *argv[]) { 
    @autoreleasepool { 
     [[Test new] run]; 
    } 
} 

Answer 2

基本上如何觀察者獲取用戶信息？

見NSNotification類參考。它有一個屬性userInfo，這是一個NSDictionary。