Question

在Java中，您可以使用以下方法获取非托管对象：

Realm realm = Realm.getDefaultInstance();
realm.beginTransaction();
dogs = realm.where(Dog.class).lessThan("age", 2).findAll()
realm.commitTransaction();
realm.close()

如何使用Realm-cocoa在Swift中执行此操作？

Answer 1

要从Swift中的Realm获取非托管对象，您可以使用init(value: AnyObject)初始值设定项：

let unmanagedObject = Object(value: existingObject)

在你的代码示例中BTW你也没有得到一个非托管对象，你需要在Java中使用这样的东西：

RealmObject unmanagedObject = Realm.copyFromRealm(RealmObject existingObject)

在docs中查看更多内容。

Answer 2

对于目标c，有助手类。 https://github.com/yusuga/RLMObject-Copying

非常老旧和过时-一个重要的解决方法是

- (instancetype)deepCopy {
    Class objClass = [RLMSchema classForString:self.objectSchema.className];
    RLMObject *object = [[objClass alloc] init];

    for (RLMProperty *property in self.objectSchema.properties) {

        if (property.array) {
            RLMArray *thisArray = [self valueForKeyPath:property.name];
            RLMArray *newArray = [object valueForKeyPath:property.name];

            for (RLMObject *currentObject in thisArray) {
                if ([currentObject isKindOfClass:[NSString class]]) {
                    [newArray addObject:(NSString*)[currentObject copy]];
                }else if ([currentObject isKindOfClass:[NSNumber class]]) {
                    [newArray addObject:(NSNumber*)[currentObject copy]];
                }else if ([currentObject isKindOfClass:[NSDate class]]) {
                    [newArray addObject:(NSDate*)[currentObject copy]];
                }else if ([currentObject isKindOfClass:[NSData class]]) {
                    [newArray addObject:(NSData*)[currentObject copy]];
                }else {
                     [newArray addObject:[currentObject deepCopy]];
                }
            }

        }
        else if (property.type == RLMPropertyTypeObject) {
            RLMObject *value = [self valueForKeyPath:property.name];
            [object setValue:[value deepCopy] forKeyPath:property.name];
        }
        else {
            id value = [self valueForKeyPath:property.name];
            [object setValue:value forKeyPath:property.name];
        }
    }

    return object;
}

如何在Swift中从Realm查询中获取非托管对象？

2 个答案: