ios中解析json对象基类

这个是对上面一篇写的一个解析json对象的基类

@interface BaseObjectFromJson : NSObject

+ (id) objectWithDict:(NSDictionary*)dict withClassName:(NSString*)className;
+ (NSArray*) objectsWithArray:(NSArray*)array withClassName:(NSString*)className;

- (id) initWithDict:(NSDictionary*)dict;
- (NSString*) propertyClassName:(NSString*)propertyName;

@end

//
//  BaseObjectFromJson.m
//  xxoo
//
//  Created by Tommy on 13-11-5.
//  Copyright (c) 2013年 Tommy. All rights reserved.
//

#import "BaseObjectFromJson.h"
#import "objcUtils.h"

@implementation BaseObjectFromJson



+ (id) objectWithDict:(NSDictionary*)dict withClassName:(NSString*)className{
    Class objClass = NSClassFromString(className);
    BaseObjectFromJson* object = nil;
    if(objClass){
        object = [[objClass alloc] initWithDict:dict];
    }else{
        NSAssert(0, @"Unknown class:%@",className);
    }

    return object;
}

+ (NSArray*) objectsWithArray:(NSArray*)array withClassName:(NSString*)className{

    Class objClass = NSClassFromString(className);
    BaseObjectFromJson* object = nil;
    NSMutableArray* objArray = nil;

    if(objClass){
        objArray = [NSMutableArray new];
        for (NSDictionary* dict in array){
            object = [[objClass alloc] initWithDict:dict];
            [objArray addObject:object];
        }
    }else{
        NSAssert(0, @"Unknown class:%@",className);
    }


    return objArray;
}

- (NSString*) description{

    NSMutableString* desc = [NSMutableString new];
    NSArray* propertyArray = getPropertyNameList(self);
    [desc appendString:@"{
"];


    for (NSString* key in propertyArray) {
        [desc appendFormat:@"  %@ : %@
",key,[self valueForKey:key]];
    }


    [desc appendString:@"
}"];

    return desc ;
}


- (id) initWithDict:(NSDictionary*)dict{
    NSArray* propertyArray = getPropertyNameList(self);
    for (NSString* key in propertyArray) {
        @try{
            if([dict[key] isKindOfClass:[NSArray class]]){
                NSString* className = [self propertyClassName:key];
                NSArray* array = [BaseObjectFromJson objectsWithArray:dict[key] withClassName:className?className:key];
                [self setValue:array forKey:key];
            }else if([dict[key] isKindOfClass:[NSDictionary class]]){
                [self setValue:[BaseObjectFromJson objectWithDict:dict[key] withClassName:key]forKey:key];
            }else{
                [self setValue:dict[key] forKey:key];
            }
        }@catch (NSException *exception) {
            NSLog(@"except:%@:%@",key,dict[key]);
        }
    }

    return self;
}
- (NSString*) propertyClassName:(NSString*)propertyName{
    return nil;
}

@end

这个demo很简单，用的还是上一篇中的例子。

NSString* jsonString = request.responseString;
NSData* jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *jsonObj = [jsonData objectFromJSONData];

Result* result = [SearchResult objectWithDict:jsonObj withClassName:@"Result"];

如果一个需要对一个json对象的解析中不存在数组之类的，就直接继承就行，什么都不用写。如果有数组的话，就需要重载

- (NSString*) propertyClassName:(NSString*)propertyName这个方法就行。这样就可以找到正确的类进行解析了。