iphone - performSelectorOnMainThread与返回值 [英] iphone - performSelectorOnMainThread with return value

问题描述

我有以下方法：

- (NSMutableArray *)getElements:(NSString *)theURL;

我想知道是否有一种方法使用performSelectorOnMainThread调用该方法，返回值。到目前为止，我尝试过：

And I wanted to know if there is a way to call that method using performSelectorOnMainThread so that I can get the return value. So far, I've tried with:

myArray = [object performSelectorOnMainThread:@selector(getElements:)
                                   withObject:url waitUntilDone:YES];

但它不工作，因为performSelectorOnMainThread返回void。我如何解决这个问题？

but it doesn't work, since performSelectorOnMainThread returns void. How could I solve this?

推荐答案

欢迎来到我的朋友的多线程环境。

Welcome to a multi-threaded environment my friend.

您需要将返回值存储在实例变量中，或通过引用通过 withObject 参数传递对象：

You'll need to store the return value in an instance variable or pass in an object by reference through the withObject parameter:

NSMutableDictionary *myDict;

[object performSelectorOnMainThread:@selector(getElements:)
                                   withObject:&myDict waitUntilDone:YES];

您的方法原型应如下所示：

Your method prototype should now look like this:

- (void)getElements:(NSMutableDictionary **)objects;

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