IOS开发（75）之把 JSON 数据转化成 Arrays 或者 Dictionaries

1 前言
通过 NSJSONSerialization 这个类的 JSONObjectWithData:options:error:方法来实现，把JSON 数据解析出来放在数据或者字典里面保存。

2 代码示例
TestDemo.m

[plain]
-(void)convseFromJson{
    NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
    [dictionary setValue:@"Anthony" forKey:@"First Name"];
    [dictionary setValue:@"Robbins" forKey:@"Last Name"];
    [dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];
    NSArray *arrayOfAnthonysChildren = [[NSArray alloc] initWithObjects:
                                        @"Anthony's Son 1",
                                        @"Anthony's Daughter 1",
                                        @"Anthony's Son 2",
                                        @"Anthony's Son 3",
                                        @"Anthony's Daughter 2", nil];
    [dictionary setValue:arrayOfAnthonysChildren forKey:@"children"];
    NSError *error = nil;
    NSData *jsonData = [NSJSONSerialization
                        dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
    if ([jsonData length] > 0 && error == nil){
        NSLog(@"Successfully serialized the dictionary into data.");
        /* Json转数组/字典 */
        error = nil;
        //转换方法
        id jsonObject = [NSJSONSerialization
                         JSONObjectWithData:jsonData options:NSJSONReadingAllowFragments
                         error:&error];
        if (jsonObject != nil && error == nil){
            NSLog(@"Successfully deserialized...");
            //如果jsonObject是字典类
            if ([jsonObject isKindOfClass:[NSDictionary class]]){
                NSDictionary *deserializedDictionary = (NSDictionary *)jsonObject;
                NSLog(@"Dersialized JSON Dictionary = %@", deserializedDictionary);
            }
            //如果jsonObject是数组类
            else if ([jsonObject isKindOfClass:[NSArray class]]){
                NSArray *deserializedArray = (NSArray *)jsonObject;
                NSLog(@"Dersialized JSON Array = %@", deserializedArray);
            } else {
                NSLog(@"I can't deal with it");
            }
        }
        else if (error != nil){
            NSLog(@"An error happened while deserializing the JSON data."); }
    }
    else if ([jsonData length] == 0 &&error == nil){
        NSLog(@"No data was returned after serialization.");
    }
    else if (error != nil){
        NSLog(@"An error happened = %@", error);
    }
}

-(void)convseFromJson{
    NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
    [dictionary setValue:@"Anthony" forKey:@"First Name"];
    [dictionary setValue:@"Robbins" forKey:@"Last Name"];
    [dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];
    NSArray *arrayOfAnthonysChildren = [[NSArray alloc] initWithObjects:
                                        @"Anthony's Son 1",
                                        @"Anthony's Daughter 1",
                                        @"Anthony's Son 2",
                                        @"Anthony's Son 3",

补充：移动开发 , IOS ,