利用runTime，实现以模型为主的字典转模型（注意与KVC的区别）

 1 //
 2 //  NSObject+Value.m
 3 //
 4 //  Created by shunzi 5-10-2014.
 5 //  Copyright (c) 2014年 shunzi. All rights reserved.
 6 //
 7 
 8 #import "NSObject+Value.h"
 9 #import <objc/message.h>
10 #import <objc/runtime.h>
11 
12 @implementation NSObject (Value)
13 - (void)setValues:(NSDictionary *)values
14 {
15     Class c = [self class];
16     
17     while (c) {
18         // 1.获得所有的成员变量
19         unsigned int outCount = 0;
20         Ivar *ivars = class_copyIvarList(c, &outCount);
21 
22         for (int i = 0; i<outCount; i++) {
23             Ivar ivar = ivars[i];
24             
25             // 2.属性名
26             NSMutableString *name = [NSMutableString stringWithUTF8String:ivar_getName(ivar)];
27             
28             // 删除最前面的_
29             [name replaceCharactersInRange:NSMakeRange(0, 1) withString:@""];
30             
31             // 3.取出属性值
32             NSString *key = name;
33             if ([key isEqualToString:@"desc"]) {
34                 key = @"description";
35             }
36             if ([key isEqualToString:@"ID"]) {
37                 key = @"id";
38             }
39             id value = values[key];
40             if (!value) continue;
41             
42             // 4.SEL
43             // 首字母
44             NSString *cap = [name substringToIndex:1];
45             // 变大写
46             cap = cap.uppercaseString;
47             // 将大写字母调换掉原首字母
48             [name replaceCharactersInRange:NSMakeRange(0, 1) withString:cap];
49             // 拼接set
50             [name insertString:@"set" atIndex:0];
51             // 拼接冒号:
52             [name appendString:@":"];
53             SEL selector = NSSelectorFromString(name);
54             
55             // 5.属性类型
56             NSString *type = [NSString stringWithUTF8String:ivar_getTypeEncoding(ivar)];
57             
58             if ([type hasPrefix:@"@"]) { // 对象类型
59                 objc_msgSend(self, selector, value);
60             } else  { // 非对象类型
61                 if ([type isEqualToString:@"d"]) {
62                     objc_msgSend(self, selector, [value doubleValue]);
63                 } else if ([type isEqualToString:@"f"]) {
64                     objc_msgSend(self, selector, [value floatValue]);
65                 } else if ([type isEqualToString:@"i"]) { 
66                     objc_msgSend(self, selector, [value intValue]);
67                 }  else { 
68                     objc_msgSend(self, selector, [value longLongValue]);
69                 }
70             }
71         }
72         
73         c = class_getSuperclass(c);
74     }
75 }
76 @end