ios - 在Swift中将MKMapPoint转换为NSValue

我想将MKMapPoint转换为NSValue。在Objective-C中，我可以使用以下语句来做到这一点:

MKMapPoint point = MKMapPointForCoordinate(location.coordinate);
NSValue *pointValue = [NSValue value:&point withObjCType:@encode(MKMapPoint)];

我该如何在Swift中做到这一点？
谢谢!

最佳答案

在Swift中是不可能的，但是您仍然可以在ObjC中创建一个类别并在Swift项目中使用它

// NSValue+MKMapPoint.h
@interface NSValue (MKMapPoint)

+ (NSValue *)valueWithMKMapPoint:(MKMapPoint)mapPoint;
- (MKMapPoint)MKMapPointValue;

@end


// NSValue+MKMapPoint.m
@implementation NSValue (MKMapPoint)

+ (NSValue *)valueWithMKMapPoint:(MKMapPoint)mapPoint {
    return [NSValue value:&mapPoint withObjCType:@encode(MKMapPoint)];
}

- (MKMapPoint)MKMapPointValue {
    MKMapPoint mapPoint;
    [self getValue:&mapPoint];
    return mapPoint;
}

@end

Swift中的用法:

let mapValue = CGValue(MKMapPoint: <your map point>)
let mapPoint = mapValue.MKMapPointValue();