本文介绍了一个Objective-C的基础模型(BaseModel)实现，该模型用于从字典数据中初始化对象并设置属性，通过映射字典键与对象属性之间的关系来完成数据绑定。
#import <Foundation/Foundation.h>
@interface BaseModel : NSObject
- (id)initContentWithDic:(NSDictionary *)jsonDic;
- (void)setAttributes:(NSDictionary *)jsonDic;
- (NSDictionary *)attributeMapDictionary:(NSDictionary *)jsonDic;
@end
#import "BaseModel.h"
@implementation BaseModel
- (id)initContentWithDic:(NSDictionary *)jsonDic
{
self = [super init];
if (self != nil) {
[self setAttributes:jsonDic];
}
return self;
}
- (void)setAttributes:(NSDictionary *)jsonDic
{
/*
key: json字典的key名
value: model对象的属性名
*/
//mapDic： 属性名与json字典的key 的映射关系
NSDictionary *mapDic = [self attributeMapDictionary:jsonDic];
for (NSString *jsonKey in mapDic) {
//modelAttr:"newsId"
//jsonKey : "id"
NSString *modelAttr = [mapDic objectForKey:jsonKey];
SEL seletor = [self stringToSel:modelAttr];
//判断self 是否有seletor 方法
if ([self respondsToSelector:seletor]) {
//json字典中的value
id value = [jsonDic objectForKey:jsonKey];
if ([value isKindOfClass:[NSNull class]]) {
value = @"";
}
//调用属性的设置器方法，参数是json的value
[self performSelector:seletor withObject:value];
}
}
}
/*
SEL 类型的创建方式有两种，例如：setNewsId: 的SEL类型
1.第一种
SEL selector = @selector(setNewsId:)
2.第二种
SEL selector = NSSelectorFromString(@"setNewsId:");
*/
//将属性名转成SEL类型的set方法
//newsId --> setNewsId:
- (SEL)stringToSel:(NSString *)attName
{
//attName: image
//截取收字母
NSString *first = [[attName substringToIndex:1] uppercaseString]; //I
NSString *end = [attName substringFromIndex:1];//mage
NSString *setMethod = [NSString stringWithFormat:@"set%@%@:",first,end];
//setImage:
//将字符串转成SEL类型
return NSSelectorFromString(setMethod);
}
/*
属性名与json字典中key的映射关系
key: json字典的key名
value: model对象的属性名
*/
- (NSDictionary *)attributeMapDictionary:(NSDictionary *)jsonDic
{
NSMutableDictionary *mapDic = [NSMutableDictionary dictionary];
for (id key in jsonDic) {
[mapDic setObject:key forKey:key];
}
/*
{
id: @"id"
image: @"image"
type: @"type"
}
*/
return mapDic;
}
@end
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