ios开发 Reflection(三) 利用反射自动绑值

反射的具体应用，自动绑值

获取属性列表

 1 - (NSArray*)propertyKeys
 2 {
 3     unsigned int outCount, i;
 4     objc_property_t *properties = class_copyPropertyList([self class], &outCount);
 5     NSMutableArray *keys = [[NSMutableArray alloc] initWithCapacity:outCount];
 6     for (i = 0; i < outCount; i++) {
 7         objc_property_t property = properties[i];
 8         NSString *propertyName = [[NSString alloc] initWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
 9         [keys addObject:propertyName];
10     }
11     free(properties);
12     return keys;
13 }

字典与属性列表形成映射

 1 - (BOOL)reflectDataFromOtherObject:(NSObject*)dataSource
 2 {
 3     BOOL ret = NO;
 4     for (NSString *key in [self propertyKeys]) {
 5         if ([dataSource isKindOfClass:[NSDictionary class]]) {
 6             ret = ([dataSource valueForKey:key]==nil)?NO:YES;
 7         }
 8         else
 9         {
10             ret = [dataSource respondsToSelector:NSSelectorFromString(key)];
11         }
12         if (ret) {
13             id propertyValue = [dataSource valueForKey:key];
14             //该值不为NSNULL，并且也不为nil
15             if (![propertyValue isKindOfClass:[NSNull class]] && propertyValue!=nil) {
16                 [self setValue:propertyValue forKey:key];
17             }
18         }
19     }
20     return ret;
21 }

下面是BookModel类的自动绑值的实现

 1 #import <Foundation/Foundation.h>
 2 @interface BookModel : NSObject
 3 {
 4     NSString* _iconUrl;
 5     NSString* _bookName;
 6     NSString* _publisher;
 7     NSString* _price;
 8     NSString* _autherName;
 9     NSString* _pubdate;
10     NSString* _translator;
11     NSString* _introUrl;
12     NSInteger _numRatings;
13     CGFloat _rating;
14 }
15 @property(retain, nonatomic)NSString* iconUrl;
16 @property(retain, nonatomic)NSString* pubdate;
17 @property(retain, nonatomic)NSString* introUrl;
18 @property(retain, nonatomic)NSString* autherName;
19 @property(retain, nonatomic)NSString* translator;;
20 @property(retain, nonatomic)NSString* bookName;
21 @property(retain, nonatomic)NSString* publisher;
22 @property(retain, nonatomic)NSString* price;
23 @property(assign, nonatomic)NSInteger numRatings;
24 @property(assign, nonatomic)CGFloat rating;
25 
26 - (NSArray*)propertyKeys;
27 
28 - (BOOL)reflectDataFromOtherObject:(NSObject*)dataSource;
29 
30 @end

 1 #import "BookModel.h"
 2 #import <objc/runtime.h>
 3 
 4 @implementation BookModel
 5 @synthesize bookName = _bookName;
 6 @synthesize iconUrl = _iconUrl;
 7 @synthesize publisher = _publisher;
 8 @synthesize price = _price;
 9 @synthesize numRatings = _numRatings;
10 @synthesize rating = _rating;
11 @synthesize autherName = _autherName;
12 @synthesize pubdate = _pubdate;
13 @synthesize translator = _translator;
14 @synthesize introUrl = _introUrl;
15 
16 - (id)init
17 {
18     self = [super init];
19     if (self) {
20         // Initialization code here.
21     }
22     
23     return self;
24 }
25 
26 - (NSArray*)propertyKeys
27 {
28     unsigned int outCount, i;
29     objc_property_t *properties = class_copyPropertyList([self class], &outCount);
30     NSMutableArray *keys = [[NSMutableArray alloc] initWithCapacity:outCount];
31     for (i = 0; i < outCount; i++) {
32         objc_property_t property = properties[i];
33         NSString *propertyName = [[NSString alloc] initWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
34         [keys addObject:propertyName];
35     }
36     free(properties);
37     return keys;
38 }
39 
40 - (BOOL)reflectDataFromOtherObject:(NSObject*)dataSource
41 {
42     BOOL ret = NO;
43     for (NSString *key in [self propertyKeys]) {
44         if ([dataSource isKindOfClass:[NSDictionary class]]) {
45             ret = ([dataSource valueForKey:key]==nil)?NO:YES;
46         }
47         else
48         {
49             ret = [dataSource respondsToSelector:NSSelectorFromString(key)];
50         }
51         if (ret) {
52             id propertyValue = [dataSource valueForKey:key];
53             //该值不为NSNULL，并且也不为nil
54             if (![propertyValue isKindOfClass:[NSNull class]] && propertyValue!=nil) {
55                 [self setValue:propertyValue forKey:key];
56             }
57         }
58     }
59     return ret;
60 }
61 
62 
63 @end

 1 #import "ViewController.h"
 2 #import "BookModel.h"
 3 
 4 
 5 @interface ViewController ()
 6 
 7 @end
 8 
 9 @implementation ViewController
10 
11 - (void)viewDidLoad
12 {
13     [super viewDidLoad];
14     // Do any additional setup after loading the view, typically from a nib.
15     NSMutableDictionary *curDic=[[NSMutableDictionary alloc]init];
16     [curDic setValue:@"iconUrlffwf" forKey:@"iconUrl"];
17     [curDic setValue:@"pubdatefewfewf" forKey:@"pubdate"];
18     [curDic setValue:@"introUrlfefewf" forKey:@"introUrl"];
19     [curDic setValue:@"autherName" forKey:@"autherNamefwfwfw"];
20     [curDic setValue:@"translatorfwfewf" forKey:@"translator"];
21     [curDic setValue:@"bookNamefvvvv" forKey:@"bookName"];
22     [curDic setValue:@"publisherfwfewf" forKey:@"publisher"];
23     [curDic setValue:@"pricefwfwf" forKey:@"price"];
24     [curDic setValue:@"numRatingsssss" forKey:@"numRatings"];
25     [curDic setValue:@"ratinggggggg" forKey:@"rating"];
26 
27     BookModel *bModel=[[BookModel alloc]init];
28     [bModel reflectDataFromOtherObject:curDic];
29     NSLog(@"bModel:%@",bModel.translator);
30     
31 }
32 
33 - (void)didReceiveMemoryWarning
34 {
35     [super didReceiveMemoryWarning];
36     // Dispose of any resources that can be recreated.
37 }
38 
39 @end