Objective-C在performSelectorOnMainThread中傳遞帶參數的消息：

-3

當傳遞給@selector的方法有參數時，需要語法方面的幫助。謝謝！Objective-C在performSelectorOnMainThread中傳遞帶參數的消息：

//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]; 
    });

來源

2012-08-14 Slinky

搜索該方法和閱讀文檔。 [NSObject文檔]（https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/nsobject_Class/Reference/Reference.html#//apple_ref/occ/instm/NSObject/performSelectorOnMainThread:withObject ：waitUntilDone :) – MechEthan 2012-08-14 17:40:14

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

來源

2012-08-14 17:37:30

提示：這就是爲什麼「withObject：」一部分是存在的。提示2：Apple爲他們的框架提供了相當不錯的文檔。

提示3：

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

來源

2012-08-14 17:37:33

Objective-C在performSelectorOnMainThread中傳遞帶參數的消息：

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