是否有任何方法可以在更改变量后获得?如果是这样,我该如何实现?
“官方”方法是INotifyPropertyChanged
。例如。 UI的控件(Windows窗体,WPF)使用它来自动刷新控件,当数据对象绑定到控件时。
public class MyClass : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
...
}
然后您可以实现这样的属性
private string _name;
public string Name
{
get { return _name; }
set {
if (value != _name) {
_name = value;
OnPropertyChanged(nameof(Name));
}
}
}
您可以这样使用它:
var myObj = new MyClass();
myObj.PropertyChanged += MyObj_PropertyChanged;
myObj.Name = "new name";
// Clean up (e.g. in a `Dispose()` method)
myObj.PropertyChanged -= MyObj_PropertyChanged;
假设此事件处理程序:
// Will be called whenever a property of `MyClass` is updated.
private void MyObj_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
// Example
if (e.PropertyName == nameof(MyClass.Name)) {
var myObj = (MyClass)sender;
//TODO: do something.
}
}
只需检查更新无效。我认为这是在Unity中实现所需目标的最简单方法。
var varToCheckIfChanged; //This is the variable you want to know if it is still the same
var tempVar; //This variable stores the original value, and every time the varToCheckIfChanged changed, you update it.
//Gets called on Start of the scene
void Start
{
tempVar = varToCheckIfChanged;
}
//Gets called every frame
void Update
{
if(varToCheckIfChanged != tempVar)
{
Debug.Log("Variable changed!"); //Debug when the variable is updated
var tempVar = varToCheckIfChanged;
}
}