从另一个线程在主线程上运行方法

发布于 2024-10-16 02:20:08 字数 631 浏览 4 评论 0原文

我的模型类必须从互联网获取一些数据。所以我决定在另一个线程上运行它，这样用户界面就不会冻结。因此，当一个对象需要一些数据时，它首先使用这种类型的方法询问模型：

- (void)giveMeSomeData:(id)object withLabel:(id)label {
objectAsking= object;
theLabel= label;
NSThread* thread= [[NSThread alloc] initWithTarget:self selector:@selector(getTheDataFromInternet) object:nil];
[thread start];
}

- (void)getTheDataFromInternet {
//getting data...

theData= [dataFromInternet retain]; //this is the data the object asked for
[self returnObjectToAsker];
}

- (void)returnObjectToAsker {
[objectAsking receiveData:theData withLabel:theLabel];
}

由于我仍然是新手，你能告诉我这是否是一个好的模式？

谢谢！

原文

My model class has to get some data from the internet. So I decided to run it on another thread so the ui doesn't freeze.
So when an object wants some data it first asks the model using a method of this type:

- (void)giveMeSomeData:(id)object withLabel:(id)label {
objectAsking= object;
theLabel= label;
NSThread* thread= [[NSThread alloc] initWithTarget:self selector:@selector(getTheDataFromInternet) object:nil];
[thread start];
}

- (void)getTheDataFromInternet {
//getting data...

theData= [dataFromInternet retain]; //this is the data the object asked for
[self returnObjectToAsker];
}

- (void)returnObjectToAsker {
[objectAsking receiveData:theData withLabel:theLabel];
}

As I'm still a newbie, can you tell me if it's a good pattern?

Thanks!

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鹤舞 2024-10-23 02:20:08

你的设置几乎是正确的。您永远不想在主线程上启动任何类型的网络连接。

就目前而言，-returnObjectToAsker 将在后台线程上执行。

您可能会对 -[NSObject PerformSelectorOnMainThread:withObject:waitUntilDone:]。

或者，如果您想使用 Grand Central Dispatch（iOS 4+、Mac OS X 10.6+）进行某些操作，您可以这样做：

#import <dispatch/dispatch.h>

- (void)giveMeSomeData:(id)object withLabel:(id)label {
    dispatch_async(dispatch_get_global_queue(0,0), ^{
      //this runs on a background thread
      //get data from the internet
      dataFromTheInternet = ...;
      dispatch_async(dispatch_get_main_queue(), ^{
        [object receiveData:dataFromTheInternet withLabel:label];
        //this runs on the main thread.  Use theData
      });
    });
}

由于块捕获了它们的环境，因此您甚至不必保存对象和 label 到 ivars 中。 :)

Your setup is pretty much correct. You never want to initiate any sort of network connection on the main thread.

As it currently stands, -returnObjectToAsker will be executed on the background thread.

You'd probably be interested in -[NSObject performSelectorOnMainThread:withObject:waitUntilDone:].

Or if you wanted to something with Grand Central Dispatch (iOS 4+, Mac OS X 10.6+), you could do:

#import <dispatch/dispatch.h>

- (void)giveMeSomeData:(id)object withLabel:(id)label {
    dispatch_async(dispatch_get_global_queue(0,0), ^{
      //this runs on a background thread
      //get data from the internet
      dataFromTheInternet = ...;
      dispatch_async(dispatch_get_main_queue(), ^{
        [object receiveData:dataFromTheInternet withLabel:label];
        //this runs on the main thread.  Use theData
      });
    });
}

Since the blocks capture their environment, you wouldn't even have to save off object and label into ivars. :)

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