NSObjectIntrospection

一个 reignited NSObject 的扩展，允许运行时检查。它允许您生成具有对象的属性键值对的字典。

先决条件

• 这些扩展使用 ARC；因此适用于 ios4.0+

如何安装

• 将 NSObject+introspection 文件夹拖入您的项目。
  
• 哪里需要，导入 #import "NSObject+introspection.h"。

用法

由于 NSObject 是几乎所有 Objective-C 对象的根类，因此几乎任何类都可以调用它。

它公开了 4 个方法

-(NSDictionary*)propertiesDict; //returns a dictionary with key-value pairs of the objects declared properties

-(NSDictionary *)iVarsDict; //returns a dictionary with key-value pairs of the objects iVars

-(NSDictionary *)methodsDict; //returns a dictionary with key-value pairs of the objects methods
//currently the  key and value are both the method name string

-(NSDictionary *)objectIntrospectDictionary; //returns a dictionary with the above 3 dictionaries with keys "properties", "iVars" and "methods"

用法说明

• 对于任何为 nil 的属性或 iVar，它对应的键将是 [NSNull null] 值。

示例

SomeObject.h

//SomeObject.h
#import <Foundation/Foundation.h>
#import "SomeOtherObject.h" // not described in readme

@interface SomeObject : NSObject {
  NSString *anIvarString;
}

@property (nonatomic, strong) NSString *someString;
@property (nonatomic, strong) SomeOtherObject *someOtherObject;

SomeObject.m

//SomeObject.m
#import "SomeObject.h"

@implementation SomeObject

@synthesize someString;
@synthesize someOtherObject;

-(id)init{
  self=[super init];

  if(self){
    anIvarString=@"some string value";
    self.someString=@"a string which is a property of our object"
    self.someOtherObject=[[SomeOtherObject alloc] init];
    }

  return self;
}

代码中任何地方

#import "NSObject+Introspection.h"
#import "SomeObject.h"
...
SomeObject *someObject=[[SomeObject alloc] init];

NSDictionary *propsDict=[someObject propertiesDict];

NSLog (@"%@",propsDict.description);

日志输出

{
    someOtherObject =  "<someOtherObject: 0x765fe50>"; //the dictionary contains the actual object instance
    someString = "a string which is a property of our object";
}

待办事项

• 谈谈从方法字典中删除 .cxx_desctruct 方法，这是 dealloc 调用后的一个方法
• 添加一些更有趣的扩展 :)