Swift中无法使用ARC的方法 [英] ARC unavailable methods in Swift

问题描述

我能够看到一个有趣的案例 Estimote Nearables SDK

I was able to see an interesting case using Estimote nearables SDK

他们有一个名为zone的类ESTNearable.

// ENUM
typedef NS_ENUM(NSInteger, ESTNearableZone ) {
   ESTNearableZoneUnknown = 0,
   ESTNearableZoneImmediate,
   ESTNearableZoneNear,
   ESTNearableZoneFar,
};

// CLASS
@interface ESTNearable : NSObject <NSCopying, NSCoding>
// ... 
@property (nonatomic, assign, readonly) ESTNearableZone zone;
// ...
@end

因此，当我尝试在 Swift 中使用此方法时，编译器将失败，并显示以下错误:

So when I try to use this method in Swift, compiler fails with that error:

据我了解，存在某种编译器错误，由于某种原因，它认为我想使用NSObject - (struct _NSZone *)zone OBJC_ARC_UNAVAILABLE;中的旧zone方法，因此我可以使用该类的其他特定属性，而不会出现任何问题.

As I understand there is some kind of compiler bug and for some reason it believes that I want to use old zone method from NSObject - (struct _NSZone *)zone OBJC_ARC_UNAVAILABLE; I can use other specific properties of that class without any problems.

当我使用SDK时，无法更改zone方法的名称.我相信我可以编写某种obj-c类别，在其中添加一些新方法，该方法将返回原始方法的值，但是我不想在我的项目中添加obj-c类.

As I use an SDK I can not change the name of the zone method. I believe I can write some kind of obj-c category, add some new method there, which will return value of original one, but I do not want to add obj-c classes in my project.

是否有可能迅速调用此方法，因为我相信类实例将调用正确的zone方法?

Is there any possibility to call this method from swift as I believe correct zone method will be called for class instances?

提前谢谢！

推荐答案

在这里，我发现了同样的问题.我回答在那儿更深入.我找不到更好的东西，所以我继续了以前的假设.

Here I found the same question. I answered more deeply there. I could not find something more good, so I went ahead with my old assumptions.

我将此类别添加到桥接标题中.效果很好.

I Added this category to Bridging Header. It worked fine.

#import <EstimoteSDK/EstimoteSDK.h>

@interface ESTNearable (Ex)

/// Solving the compiler problem that "zone" method is unavailable in Swift
@property (readonly) ESTNearableZone nearableZone;

@end

// Implementation

@implementation ESTNearable (Ex)

- (ESTNearableZone)nearableZone
{
    return self.zone;
}

@end

之后，我只在 Swift

var zone = someNearable.nearableZone

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