我需要将自定义对象的NSCountedSet持久化到NSUserDefaults。:The returned object is immutable, even if the value you originally set was mutable问题
当我需要保留NSCountedSet包含的内部计数元数据时,如果NSUserDefaults从-(id)objectForKey:返回不可变的NSSet,那么如何持久化NSCountedSet?
我想使用formbuilder的array函数来处理formcontrol数组。我有一个现有的自定义对象数组,需要添加到该FormArray中,但是它只接受FormGroup作为参数。如何将我的自定义对象数组转换为FormGroup对象,以便将这些对象添加到FormArray中?formGroupArray);
但是这会给我一个错误"ERROR TypeError: Circular reference in value a
https://blog.logrocket.com/flutter-push-notifications-with-firebase-cloud-messaging/ // For handling the received notifications // Parse the message received title: message.notific