Objective-C 在 performSelectorOnMainThread 中使用参数传递消息：[关闭]答案

【问题标题】：Objective-C Passing Messages with Arguments in performSelectorOnMainThread: [closed]Objective-C 在 performSelectorOnMainThread 中使用参数传递消息：[关闭]
【发布时间】：2012-08-14 17:34:55
【问题描述】：

当传递给@selector 的方法有参数时需要语法帮助。谢谢！

//This works
dispatch_async(kBgQueue, ^{ 

 [self performSelectorOnMainThread:@selector(hydrateList) withObject:nil waitUntilDone:YES];   

});



//But what about when the method in the selector has arguments?
//This is incorrect, syntactically
  dispatch_async(kBgQueue, ^{ 

     [self performSelectorOnMainThread:@selector(hydrateListForCategory:self.categorySelected) withObject:nil waitUntilDone:YES];
  });

【问题讨论】：

搜索该方法并阅读文档。 NSObject documentation

标签： objective-c ios5 objective-c-blocks performselector

【解决方案1】：

提示：这就是“withObject:”部分存在的原因。

提示 2：Apple 为其框架提供了非常好的文档。

提示 3：

[self performSelectorOnMainThread:@selector(hydrateListForCategory:) withObject:self.categorySelected waitUntilDone:YES];

【讨论】：

【解决方案2】：

[self performSelectorOnMainThread:@selector(hydrateListForCategory:) withObject:self.categorySelected waitUntilDone:YES];

【讨论】：