47 lines
1.5 KiB
Markdown
47 lines
1.5 KiB
Markdown
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# BlueprintReadWrite
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- **功能描述：** 可从蓝图读取或写入此属性。
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- **元数据类型：** bool
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- **引擎模块：** Blueprint
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- **作用机制：** 在PropertyFlags中加入[CPF_BlueprintVisible](../../../../Flags/EPropertyFlags/CPF_BlueprintVisible.md)
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- **常用程度：** ★★★★★
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可从蓝图读取或写入此属性。
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此说明符与 BlueprintReadOnly 说明符不兼容。
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## 示例代码：
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```cpp
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public:
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//PropertyFlags: CPF_BlueprintVisible | CPF_ZeroConstructor | CPF_IsPlainOldData | CPF_NoDestructor | CPF_HasGetValueTypeHash | CPF_NativeAccessSpecifierPublic
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UPROPERTY(BlueprintReadWrite, Category = Blueprint)
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int32 MyInt_ReadWrite = 123;
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//PropertyFlags: CPF_BlueprintVisible | CPF_BlueprintReadOnly | CPF_ZeroConstructor | CPF_IsPlainOldData | CPF_NoDestructor | CPF_HasGetValueTypeHash | CPF_NativeAccessSpecifierPublic
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UPROPERTY(BlueprintReadOnly, Category = Blueprint)
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int32 MyInt_ReadOnly = 123;
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```
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## 示例效果：
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蓝图中可读写：
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## 原理：
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如果有CPF_Edit | CPF_BlueprintVisible | CPF_BlueprintAssignable之一，则可以Get属性。
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```cpp
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EPropertyAccessResultFlags PropertyAccessUtil::CanGetPropertyValue(const FProperty* InProp)
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{
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if (!InProp->HasAnyPropertyFlags(CPF_Edit | CPF_BlueprintVisible | CPF_BlueprintAssignable))
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{
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return EPropertyAccessResultFlags::PermissionDenied | EPropertyAccessResultFlags::AccessProtected;
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}
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return EPropertyAccessResultFlags::Success;
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}
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```
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