在Swift中获取PHAsset的位置 [英] Getting the location of a PHAsset in Swift

问题描述

出于某种原因， PHAsset 上的 location 属性仅在Objective-c中公开，而不在Swift中公开。

For some reason the location property on a PHAsset is only exposed in Objective-c and not in Swift.

文档：PHAsset.location

为了解决这个问题，我想我可以创建一个Objective-C类其唯一目的是提取位置并将其导入Swift。

To work around it, I figured I could create a Objective-C class whose sole purpose is to extract the location and import it into Swift.

LocationGetter.h

LocationGetter.h

@interface LocationGetter : NSObject
+ (CLLocation *)locationForAsset:(PHAsset *) asset;
@end

LocationGetter.m

LocationGetter.m

@implementation LocationGetter
+ (CLLocation *)locationForAsset:(PHAsset *) asset {
    return [asset location];
}
@end

到目前为止这么好，但是当我尝试在Swift中使用它：

So far so good, but when I try to use it in Swift:

LocationGetter.locationForAsset(ass)

'LocationGetter.Type'没有名为'locationForAsset'的成员

'LocationGetter.Type' does not have a member named 'locationForAsset'

奖金问题：为什么Apple没有在swift中公开位置？

推荐答案

事实证明答案非常简单。问题是Swift文件不知道 CLLocation 是什么，因此拒绝导入该函数。导入 CoreLocation 解决了这个问题。

It turns out that the answer is really simple. The problem is that the Swift file don't know what a CLLocation is, and thus refuses to import that function. Importing CoreLocation solves the issue.

import CoreLocation

LocationGetter.locationForAsset(ass)

编辑： Apple已经从那时起包含 .location 作为 PHAsset 的getter。获取位置现在就像 asset.location 一样简单。

Apple has since included .location as a getter on the PHAsset. Getting the location is now as easy as asset.location.

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