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

- (NSArray*)propertyKeys
{
    unsigned int outCount, i;
    objc_property_t *properties = class_copyPropertyList([self class], &outCount);
    NSMutableArray *keys = [[NSMutableArray alloc] initWithCapacity:outCount];
    for (i = 0; i < outCount; i++) {
        objc_property_t property = properties[i];
        NSString *propertyName = [[NSString alloc] initWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
        [keys addObject:propertyName];
    }
    free(properties);
    return keys;
}

字典与属性列表形成映射

- (BOOL)reflectDataFromOtherObject:(NSObject*)dataSource
{
    BOOL ret = NO;
    for (NSString *key in [self propertyKeys]) {
        if ([dataSource isKindOfClass:[NSDictionary class]]) {
            ret = ([dataSource valueForKey:key]==nil)?NO:YES;
        }
        else
        {
            ret = [dataSource respondsToSelector:NSSelectorFromString(key)];
        }
        if (ret) {
            id propertyValue = [dataSource valueForKey:key];
            //该值不为NSNULL，并且也不为nil
            if (![propertyValue isKindOfClass:[NSNull class]] && propertyValue!=nil) {
                [self setValue:propertyValue forKey:key];
            }
        }
    }
    return ret;
}

下面是BookModel类的自动绑值的实现

#import <Foundation/Foundation.h>
@interface BookModel : NSObject
{
    NSString* _iconUrl;
    NSString* _bookName;
    NSString* _publisher;
    NSString* _price;
    NSString* _autherName;
    NSString* _pubdate;
    NSString* _translator;
    NSString* _introUrl;
    NSInteger _numRatings;
    CGFloat _rating;
}
@property(retain, nonatomic)NSString* iconUrl;
@property(retain, nonatomic)NSString* pubdate;
@property(retain, nonatomic)NSString* introUrl;
@property(retain, nonatomic)NSString* autherName;
@property(retain, nonatomic)NSString* translator;;
@property(retain, nonatomic)NSString* bookName;
@property(retain, nonatomic)NSString* publisher;
@property(retain, nonatomic)NSString* price;
@property(assign, nonatomic)NSInteger numRatings;
@property(assign, nonatomic)CGFloat rating;

- (NSArray*)propertyKeys;

- (BOOL)reflectDataFromOtherObject:(NSObject*)dataSource;

@end

#import "BookModel.h"
#import <objc/runtime.h>

@implementation BookModel
@synthesize bookName = _bookName;
@synthesize iconUrl = _iconUrl;
@synthesize publisher = _publisher;
@synthesize price = _price;
@synthesize numRatings = _numRatings;
@synthesize rating = _rating;
@synthesize autherName = _autherName;
@synthesize pubdate = _pubdate;
@synthesize translator = _translator;
@synthesize introUrl = _introUrl;

- (id)init
{
    self = [super init];
    if (self) {
        // Initialization code here.
    }
    
    return self;
}

- (NSArray*)propertyKeys
{
    unsigned int outCount, i;
    objc_property_t *properties = class_copyPropertyList([self class], &outCount);
    NSMutableArray *keys = [[NSMutableArray alloc] initWithCapacity:outCount];
    for (i = 0; i < outCount; i++) {
        objc_property_t property = properties[i];
        NSString *propertyName = [[NSString alloc] initWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
        [keys addObject:propertyName];
    }
    free(properties);
    return keys;
}

- (BOOL)reflectDataFromOtherObject:(NSObject*)dataSource
{
    BOOL ret = NO;
    for (NSString *key in [self propertyKeys]) {
        if ([dataSource isKindOfClass:[NSDictionary class]]) {
            ret = ([dataSource valueForKey:key]==nil)?NO:YES;
        }
        else
        {
            ret = [dataSource respondsToSelector:NSSelectorFromString(key)];
        }
        if (ret) {
            id propertyValue = [dataSource valueForKey:key];
            //该值不为NSNULL，并且也不为nil
            if (![propertyValue isKindOfClass:[NSNull class]] && propertyValue!=nil) {
                [self setValue:propertyValue forKey:key];
            }
        }
    }
    return ret;
}


@end

#import "ViewController.h"
#import "BookModel.h"


@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSMutableDictionary *curDic=[[NSMutableDictionary alloc]init];
    [curDic setValue:@"iconUrlffwf" forKey:@"iconUrl"];
    [curDic setValue:@"pubdatefewfewf" forKey:@"pubdate"];
    [curDic setValue:@"introUrlfefewf" forKey:@"introUrl"];
    [curDic setValue:@"autherName" forKey:@"autherNamefwfwfw"];
    [curDic setValue:@"translatorfwfewf" forKey:@"translator"];
    [curDic setValue:@"bookNamefvvvv" forKey:@"bookName"];
    [curDic setValue:@"publisherfwfewf" forKey:@"publisher"];
    [curDic setValue:@"pricefwfwf" forKey:@"price"];
    [curDic setValue:@"numRatingsssss" forKey:@"numRatings"];
    [curDic setValue:@"ratinggggggg" forKey:@"rating"];

    BookModel *bModel=[[BookModel alloc]init];
    [bModel reflectDataFromOtherObject:curDic];
    NSLog(@"bModel:%@",bModel.translator);
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end