Objective C 属性变量和非属性变量的存储 [英] Storage of Objective C property variables and non property variables

问题描述

任何人都可以澄清一下，objective c 中存储的变量究竟在哪里?

Can anyone please clarify me that where exactly the variables stored in objective c ?

在 .h 文件中

@interface example: NSObject
{
  NString *string;      // where is this stored
  int     number;       // where is this stored
}
@property (nonatomic,strong) NSURL* mURL;  // where is this stored

@end

同样，

在 .m 文件中

# import "xyz.h"

NSString *constant = @"hello";  // where is this stored

@interface example()
{
  NString *textg;      // where is this stored
  int     numb;       // where is this stored
}
@property (nonatomic,strong) NSURL* sURL;  // where is this stored

@end

推荐答案

string"、textg"、number"和numb"是类的实例变量.区别在于string"和number"可以公开访问(通过ref->number)，而textg"和numb"是私有的(因为其他类通常不#import .m文件).

"string", "textg", "number" and "numb" are instance variables to the class. The difference is that "string" and "number" are eligible to be publicly accessible (via ref->number), and "textg" and "numb" are private (since other classes conventionally do not #import .m files).

mURL"和sURL"属性存储为实例变量_mURL"和_sURL".同样，_mURL"有资格被公开访问(通过 ref->_mURL)，而_sURL"不是出于同样的原因.

"mURL" and "sURL" properties are stored as instance variables "_mURL" and "_sURL". Again, "_mURL" is eligible to be publicly accessible (via ref->_mURL), and "_sURL" is not for the same reason.

而且，常量"是一个存储在堆上的普通全局变量.

And, "constant" is an ordinary global variable stored on the heap.

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