迅速跟随以下块属性的属性块声明等效于什么? [英] What is the property block declaration equivalent in swift of the following block property?

问题描述

在Objective-C中，我这样做:

In Objective-C I do this:

@property (nonatomic, copy) void(^completion)(MyObject * obj);

迅速做到这一点的正确方法是什么?

What is the correct way to do this in swift?

推荐答案

相应的闭包属性将声明为

The corresponding closure property would be declared as

class MyClass {
     var completion : ((MyObject) -> Void)? // or ...! for an implicitly unwrapped optional
}

您可以将属性设置为

completion = {
    (obj : MyObject) -> Void in
    // do something with obj ...
}

可以将其缩短(由于自动类型推断)

which can be shortened (due to the automatic type inference) to

completion = {
    obj in
    // do something with obj ...
}

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