setter

问题 My Xcode app is getting the following exception error message. -[UINavigationController setDeals:]: unrecognized selector sent to instance 0x8338d40 The exception is being thrown in the following context in the prepareForSegue: method, likely with the destination item. The key line where the exception is thrown is marked with this comment. //**********exception BSViewController.h #import <UIKit/UIKit.h> @class BSData; @interface BSViewController : UIViewController <UITextViewDelegate,

问题 I'm trying to make a setter method (setAvailForAssembly) that sets the assembledstocklevel but for some reason my if conditions don't seem to be making any effect. Why this is happening? Main Class public class TestAssembledPart { public static void main(String args[]) { // Constructing two Part objects (the base parts) Part part0 = new Part("p101", "Crank", 218, 12.20); Part part1 = new Part("p102", "Pedal", 320, 14.30); // Constructing AssembledPart object assembled from p101 & p102

问题 I'm trying to create a class in Java using BlueJ. My class is named Automobile. My goal is to be able to use my Constructor method to create cars with the variables: year, color, brand, number of doors, number of kilometers, if it's automatic (boolean), if it's sold (boolean), a description, and an identification number. All the variables have a set default value, a minimum and a maximum accepted value. I have to use getVariablename and setVariablename for my methods. My color and brand

问题 May be I do not completely understand the concept of properties in python, but I am confused by the behaviour of my Python program. I have a class like this: class MyClass(): def __init__(self, value): self._value = value @property def value(self): return self._value @value.setter def value(self, value): self._value = value What I would expect is, that calling MyClass.value = ... changes the content of _value. But what actually happened is this: my_class = MyClass(1) assert my_class.value ==

问题 I found in Scala: can't write setter without getter? that you can't create a setter without getter: The interpretation of an assignment to a simple variable x = e depends on the definition of x. If x denotes a mutable variable, then the assignment changes the current value of x to be the result of evaluating the expression e. The type of e is expected to conform to the type of x. If x is a parameterless function defined in some template, and the same template contains a setter function x_= as

问题 I need to make it so that every time a specific property on my object is changed - it will call a special method on the same object. Example: MyObject.prototype = Object.create({ specialMethod: function() { /* ... */ } }, { someValue: { set: function(value) { /* HOW DO I ASSIGN THE VALUE TO MyObject HERE?*/ /* I can't do: this.someValue=value, that would create endless recursion */ this.specialMethod(); } } }); How do I assign the value to MyObject within the property setter? 回答1: There is no

问题 I have a piece of hardware I write a class for which has multiple inputs. Each input (channel) has a name, so I created a list: CHANNELS = {"T0": 0, "Tend": 1, "A": 2, "B": 3, "C" : 4, "D" : 5, "E" : 6, "F" : 7, "G" : 8, "H" : 9} Now I would like to create a property to access the value of each channel: @property def readT0(self) return self._query("REQUEST STRING 0") # the request string expects a number, instead of the real name T0 @property def readTend(self) return self._query("REQUEST

问题 I have a class like this: Public Class MyClass Private _intList As New List(Of Integer) Private _avg As Decimal Public Sub Add(ByVal anInt As Integer) _intList.Add(anInt) End Sub Public Property Avg() As Decimal Get Dim _sum As Integer = 0 For Each anInt In _intList _sum += anInt Next Avg = If((_intList.Count > 0), _sum / _intList.Count, _avg) Return _avg End Get Set(ByVal value As Decimal) If _avg <> value Then _avg = value Console.WriteLine("Value changed") End If End Set End Property End

问题 I'm currently having Type1 &GetType1() const { return *this->type1; } void SetType1(const Type1 &type1) { *this->type1 = type1; } and in the class definition class Type2 { public: Type2(); virtual ~Type2(); Type1 &GetType1() const; void SetType1(const Type1 &type1); private: Type1 *type1 = nullptr; } And in main int main() { Type2 *type2 = new Type2(); Type1 *newType1 = new Type1(); type2->SetType1(*newType1); delete type2; delete newType1; } everywhere in my project. It seems to me that this

问题 I have a abstract class called WizardViewModelBase. All my WizardXXXViewModel classes inherit from the base abstract class. The base has a property with a getter. Every sub class needs and overrides that string property as its the DisplayName of the ViewModel. Only ONE ViewModel called WizardTimeTableWeekViewModel needs a setter because I have to set wether the ViewModel is a timetable for week A or week B. Using 2 ViewModels like WizardTimeTableWeekAViewModel and