带返回类型的内联块 [英] Inline Block With Return Type

问题描述

在Objective-C中可以创建一个内联块并使用其返回类型吗?例如，是否可以创建一个返回BOOL的块，使其内联，并将其返回类型用于赋值.

Is it possible in Objective-C to create a block inline and use its return type? For example, can I create a block that returns a BOOL, have it be inline, and use its return type for an assignment.

BOOL b = <inline block that returns BOOL> { // unsure of the syntax / legality of this
    return YES; // will be more logic in here, that is why I want to use a block.
};

我在使用块语法时遇到麻烦，并且不确定是否可以内联创建块.我检查了以下资源，无济于事.

I am having trouble with the block syntax, and am unsure if a block can be created inline. I have checked the following resources with no avail.

• 块备忘单
• 天哪"块语法
• 当然还有

• Block Cheat Sheet
• Gosh Darn Block Syntax
• And of Course, The Apple Documentation

如果这是不可能的，或者非常容易，那么谢谢您的时间和耐心.

Thankyou for your time and patience if this happens to be impossible, or very easy.

推荐答案

您需要使用以下内容:

BOOL b = ^(){ return YES; }();

这实际上创建了块，然后调用它.虽然不好看，所以您也可以做这样的事情:

This actually creates the block and then calls it. It's not nice to read though, so you may as well just do something like this:

BOOL b = NO;
{
    // Other stuff, will be local
    b = YES;
}

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