42 lines
2.0 KiB
Markdown
42 lines
2.0 KiB
Markdown
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# BlueprintGetter
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- **功能描述：** 为属性定义一个自定义的Get函数来读取。
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- **元数据类型：** string="abc"
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- **引擎模块：** Blueprint
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- **作用机制：** 在PropertyFlags中加入[CPF_BlueprintReadOnly](../../../../Flags/EPropertyFlags/CPF_BlueprintReadOnly.md)、[CPF_BlueprintVisible](../../../../Flags/EPropertyFlags/CPF_BlueprintVisible.md)，在Meta中加入[BlueprintGetter](../../../../Meta/Blueprint/BlueprintGetter.md)
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- **常用程度：** ★★★
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为属性定义一个自定义的Get函数来读取。
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如果没有设置BlueprintSetter或BlueprintReadWrite，则会默认设置BlueprintReadOnly，这个属性变成只读的。
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## 示例代码：
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```cpp
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public:
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//(BlueprintGetter = , Category = Blueprint, ModuleRelativePath = Property/MyProperty_Test.h)
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UFUNCTION(BlueprintGetter, Category = Blueprint) //or BlueprintPure
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int32 MyInt_Getter()const { return MyInt_WithGetter * 2; }
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//(BlueprintSetter = , Category = Blueprint, ModuleRelativePath = Property/MyProperty_Test.h)
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UFUNCTION(BlueprintSetter, Category = Blueprint) //or BlueprintCallable
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void MyInt_Setter(int NewValue) { MyInt_WithSetter = NewValue / 4; }
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private:
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//(BlueprintGetter = MyInt_Getter, Category = Blueprint, ModuleRelativePath = Property/MyProperty_Test.h)
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//PropertyFlags: CPF_BlueprintVisible | CPF_BlueprintReadOnly | CPF_ZeroConstructor | CPF_IsPlainOldData | CPF_NoDestructor | CPF_HasGetValueTypeHash | CPF_NativeAccessSpecifierPrivate
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UPROPERTY(BlueprintGetter = MyInt_Getter, Category = Blueprint)
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int32 MyInt_WithGetter = 123;
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//(BlueprintSetter = MyInt_Setter, Category = Blueprint, ModuleRelativePath = Property/MyProperty_Test.h)
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//PropertyFlags: CPF_BlueprintVisible | CPF_ZeroConstructor | CPF_IsPlainOldData | CPF_NoDestructor | CPF_HasGetValueTypeHash | CPF_NativeAccessSpecifierPrivate
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UPROPERTY(BlueprintSetter = MyInt_Setter, Category = Blueprint)
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int32 MyInt_WithSetter = 123;
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```
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## 示例效果：
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可见MyInt_WithGetter是只读的。
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而MyInt_WithSetter 是可读写的。
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