初始化一个只读属性

最新推荐文章于 2021-12-13 21:09:27 发布

转载最新推荐文章于 2021-12-13 21:09:27 发布 · 1k 阅读

文章标签：

#ios #iOS #IOS

本文详细介绍了如何在Objective-C中通过直接赋值或私有类扩展来灵活地控制属性的读写性，特别强调了在不同场景下使用这些方法的重要性，并提供了实例代码来辅助理解。

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Either assign to the instance variable directly (don't forget to add a retain orcopy if you need it) or redeclare the property in a private class extension. Like this:

In your .h file:

@property (readonly, copy) NSString *firstName;

In your .m file:

@interface MyClass ()

// Redeclare property as readwrite
@property (readwrite, copy) NSString *firstName;

@end


@implementation MyClass

@synthesize firstName;
...

Now you can use the synthesized setter in your implementation but the class interface still shows the property as readonly. Note that other classes that import your .h file can still call-[MyClass setFirstName:] but they won't know that it exists and will get a compiler warning

another

In your .h file:

@property (readonly, copy)NSString*firstName;

@interface MyClass ()

@synthesize firstName  = _firstName;
@end


only can you use _fisrtName to init