新版本

Ifish/controllers/HotBar/Lib/MJExtension/MJPropertyKey.h

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+//
+//  MJPropertyKey.h
+//  MJExtensionExample
+//
+//  Created by MJ Lee on 15/8/11.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+typedef enum {
+    MJPropertyKeyTypeDictionary = 0, // 字典的key
+    MJPropertyKeyTypeArray // 数组的key
+} MJPropertyKeyType;
+
+/**
+ *  属性的key
+ */
+@interface MJPropertyKey : NSObject
+/** key的名字 */
+@property (copy,   nonatomic) NSString *name;
+/** key的种类，可能是@"10"，可能是@"age" */
+@property (assign, nonatomic) MJPropertyKeyType type;
+
+/**
+ *  根据当前的key，也就是name，从object（字典或者数组）中取值
+ */
+- (id)valueInObject:(id)object;
+
+@end