Question

我在AppDelegate.m中编写了一些函数，如下所示：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    debugMethod();
    self.WeiboStatusesDatabaseContext = [self createMainQueueManagedObjectContext];
    return YES;
}

- (void)setWeiboStatusesDatabaseContext:(NSManagedObjectContext *)WeiboStatusesDatabaseContext
{
    debugMethod();
    _WeiboStatusesDatabaseContext = WeiboStatusesDatabaseContext;
    NSDictionary *userInfo = self.WeiboStatusesDatabaseContext ? @{WeiboSTATUSESDatabaseAvailabilityContext : self.WeiboStatusesDatabaseContext} : nil;
    [[NSNotificationCenter defaultCenter] postNotificationName:WeiboSTATUSESDatabaseAvailabilityNotification
                                                    object:self
                                                  userInfo:userInfo];
}

我还在MainPageCDTVC.m中编写了一个函数，它是一个CoreData TableViewController：

- (void)awakeFromNib
{
    debugMethod();
    [[NSNotificationCenter defaultCenter] addObserverForName:WeiboSTATUSESDatabaseAvailabilityNotification
                                                  object:nil
                                                   queue:nil
                                              usingBlock:^(NSNotification *note) {
                                                  self.managedObjectContext = note.userInfo[WeiboSTATUSESDatabaseAvailabilityContext];
                                                  debugLog(@"context = %@", self.managedObjectContext);
                                              }];
    debugLog(@"Context = %@", self.managedObjectContext);
}

当我将MainPageCDTVC设置为初始ViewController并运行此应用程序时，我从Xcode控制台获得了一个结果：

2015-04-02 11:37:38.650 WeiboDemo[962:48379] -[MainPageCDTVC awakeFromNib]
2015-04-02 11:37:38.665 WeiboDemo[962:48379] Context = (null)
2015-04-02 11:37:38.669 WeiboDemo[962:48379] -[AppDelegateapplication:didFinishLaunchingWithOptions:]
2015-04-02 11:37:38.673 WeiboDemo[962:48379] file:///Users/wlSong/Library/Developer/CoreSimulator/Devices/7DCCFF56-7A91-4DCC-BB20-CE33FCAE42BF/data/Containers/Data/Application/82C32B6F-A842-4BFD-A9DF-0126A7C290BC/Documents/
2015-04-02 11:37:38.691 WeiboDemo[962:48379] managedObjectContext have created.
2015-04-02 11:37:38.691 WeiboDemo[962:48379] -[AppDelegate setWeiboStatusesDatabaseContext:]
2015-04-02 11:37:38.695 WeiboDemo[962:48379] context = < NSManagedObjectContext: 0x7b84da00 >

我的问题是：

为什么＆＃34; context =＆lt; NSManagedObjectContext：0x7b84da00＆gt;＆＃34;出现在最后？
那是 - [AppDelegate应用程序：didFinishLaunchingWithOptions：]和 - [MainPageCDTVC awakeFromNib]在同一个线程中吗？
如果他们先跑谁？

PS：我是中国人，我的英语很差。原谅我。

Answer 1

订单是：

awakeFromNib
applicationWillFinishLaunching
applicationDidFinishLaunching

您不必担心多线程/并行性。如果您按照订单操作，您将看到：

awakeFromNib =＆gt; defaultCenter observer add =＆gt; print（null）context
applicationDidFinishLaunching =＆gt; call setter =＆gt; setter posts notification =＆gt;打印背景

iOS中的多线程和NSNotification

1 个答案: