自动释放池和dispatch_async
我读了关于GCD的文章，有一个例子：
dispatch_queue_t bgQueue = myQueue;
dispatch_async(dispatch_get_main_queue(), ^{
NSString *stringValue = [[[textField stringValue] copy] autorelease];
dispatch_async(bgQueue, ^{
// use stringValue in the background now
});
});
如果我将该方法放在单击处理程序中（将在自动释放池中调用），我会丢失stringValue吗，因为单击事件后自动释放池将被销毁？
I read the article about GCD, and there is an example:
dispatch_queue_t bgQueue = myQueue;
dispatch_async(dispatch_get_main_queue(), ^{
NSString *stringValue = [[[textField stringValue] copy] autorelease];
dispatch_async(bgQueue, ^{
// use stringValue in the background now
});
});
If i place that method in click handler (which will be called in the autoreleasepool), will i loss stringValue, because autoreleasepool will be destroyed after click event?
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在那个内部块里面？不，你不会失去这个价值。当在块内引用 Objective-C 对象变量（尚未声明为 __block）并且复制该块时，该对象将自动保留。当块被释放时，该对象也将被释放。
dispatch_async()负责复制和释放块。Inside that inner block? No, you won’t lose that value. When an Objective-C object variable (which hasn’t been declared as
__block) is referenced inside a block and the block is copied, that object is automatically retained. When the block is released, that object will be released, too.dispatch_async()is responsible for copying and releasing the block.