xcode 如何将财产私有化？
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How to make properties private?
提问by Randall
Someone told me I could make properties private so that only an instance of the class can refer to them (via self.)
有人告诉我我可以将属性设为私有，以便只有类的实例可以引用它们（通过 self.）。
However, if I use @private in the class interface and then declare the property normally, it can still be accessed from outside of the class... So how can I make properties private? Syntax example please.
但是，如果我在类接口中使用@private，然后正常声明属性，仍然可以从类外部访问它......那么我如何将属性设为私有？请语法示例。
回答by dtuckernet
You need to include these properties in a class extension. This allows you to define properties (and more recently iVars) within your implementation file in an interface declaration. It is similar to defining a category but without a name between the parentheses.
您需要在类扩展中包含这些属性。这允许您在接口声明中的实现文件中定义属性（以及最近的 iVars）。它类似于定义一个类别，但在括号之间没有名称。
So if this is your MyClass.m file:
因此，如果这是您的 MyClass.m 文件：
// Class Extension Definition in the implementation file
@interface MyClass()
@property (nonatomic, retain) NSString *myString;
@end
@implementation MyClass
- (id)init
{
self = [super init];
if( self )
{
// This property can only be accessed within the class
self.myString = @"Hello!";
}
}
@end
回答by kubi
Declare the property in the implementation (.m) file, like so:
在实现 (.m) 文件中声明属性，如下所示：
@interface MyClass()
@property (nonatomic, retain) MyPrivateClass *secretProperty;
@end
You'll be able to use that property within your class without a compiler warning.
您将能够在没有编译器警告的情况下在您的类中使用该属性。
