在非主线程中运行Cocoa GUI [英] Running a Cocoa GUI in a non-main thread

问题描述

我在开发可可用户界面时遇到gui /线程相关的问题。应用程序设计如下：

主线程（＃1）：解析参数，加载插件等。

Gui线程（＃？）：启动gui，处理事件等。它的gui线程。

Cocoa框架是非线程安全的，规则，GUI必须在主线程上运行。断言用于检查这一点。为了尝试解决这个问题，我自己实现了run方法（代码如下） - http：// cocoawithlove .com / 2009/01 / demystifying-nsapplication-by.html - 指南。但我错过了一些东西。打开一个窗口，但保持空白（完全为白色）。虽然如果我在主线程中调用它的工作完美。

所以基本上我需要弄清楚缺少什么。

   - （void）run 
 {
 NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; 
 
 [self finishLaunching]; 
 
 shouldKeepRunning = YES; 
 do 
 {
 [pool release]; 
 pool = [[NSAutoreleasePool alloc] init]; 
 
 NSEvent * event = 
 [self 
 nextEventMatchingMask：NSAnyEventMask 
 untilDate：[NSDate distantFuture] 
 inMode：NSDefaultRunLoopMode 
 dequeue：YES] ; 
 
 [self sendEvent：event]; 
 [self updateWindows]; 
} while（shouldKeepRunning）; 
 
 [pool release]; 
} 
 
  - （void）terminate：（id）sender 
 {
 shouldKeepRunning = NO; 
} 
  

解决方案

这种方法永远不会工作。即使你修复了当前的问题（窗口不绘图），你会立即遇到另一个模糊，不可能修复的问题，另一个，另一个。 Cocoa期望GUI线程成为主线程，故事结束。

I am having a gui/threading related problem in developing a cocoa user interface. The application is designed like this:

Main Thread (#1): parses arguments, loads plugins, etc.

Gui thread (#?): launches the gui, handles events, etc. Its the gui thread.

The Cocoa framework is non-thread safe, but enforces one rule, the GUI must run on the main thread. A assertion is used to check this. To try to go around this I implemented the run method myself (code below) following this - http://cocoawithlove.com/2009/01/demystifying-nsapplication-by.html - guide. But I am missing something. A window is opened, but stays blank (completely white). Although if I make the call in the main thread it works perfectly.

So basically I need to figure out what's missing.

- (void)run
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    [self finishLaunching];

    shouldKeepRunning = YES;
    do
    {
        [pool release];
        pool = [[NSAutoreleasePool alloc] init];

        NSEvent *event =
            [self
                nextEventMatchingMask:NSAnyEventMask
                untilDate:[NSDate distantFuture]
                inMode:NSDefaultRunLoopMode
                dequeue:YES];

        [self sendEvent:event];
        [self updateWindows];
    } while (shouldKeepRunning);

    [pool release];
}

- (void)terminate:(id)sender
{
    shouldKeepRunning = NO;
}

解决方案

Don't. This approach will never work. Even if you fix your current problem (the window not drawing) you'll immediately run into another obscure, impossible-to-fix problem, and another, and another. Cocoa expects the GUI thread to be the main thread, end of story.

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