我有一个像json字符串：
- {
- "a":"val1","b":"val2","c":"val3"
- }
我有一个客观的C头文件,如：
- @interface TestItem : NSObject
- @property NSString *a;
- @property NSString *b;
- @property NSString *c;
- @end
我可以解析Json并获取TestItem类的实例吗？
我知道如何将json解析为字典,但我想在一个类中解析它(类似于gson在Java中所做的那样).
解决方法
您不必直接使用字典,而是始终使用键值编码将JSON反序列化(解析)到您的类.键值编码是Cocoa的一个很好的特性,它允许您在运行时按名称访问类的属性和实例变量.正如我所看到的,您的JSON模型并不复杂,您可以轻松应用它.
person.h
- #import <Foundation/Foundation.h>
- @interface Person : NSObject
- @property NSString *personName;
- @property NSString *personMiddleName;
- @property NSString *personLastname;
- - (instancetype)initWithJSONString:(NSString *)JSONString;
- @end
person.m
- #import "Person.h"
- @implementation Person
- - (instancetype)init
- {
- self = [super init];
- if (self) {
- }
- return self;
- }
- - (instancetype)initWithJSONString:(NSString *)JSONString
- {
- self = [super init];
- if (self) {
- NSError *error = nil;
- NSData *JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];
- NSDictionary *JSONDictionary = [NSJSONSerialization JSONObjectWithData:JSONData options:0 error:&error];
- if (!error && JSONDictionary) {
- //Loop method
- for (NSString* key in JSONDictionary) {
- [self setValue:[JSONDictionary valueForKey:key] forKey:key];
- }
- // Instead of Loop method you can also use:
- // thanks @sapi for good catch and warning.
- // [self setValuesForKeysWithDictionary:JSONDictionary];
- }
- }
- return self;
- }
- @end
appDelegate.m
- @implementation AppDelegate
- - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
- // JSON String
- NSString *JSONStr = @"{ \"personName\":\"MyName\",\"personMiddleName\":\"MyMiddleName\",\"personLastname\":\"MyLastName\" }";
- // Init custom class
- Person *person = [[Person alloc] initWithJSONString:JSONStr];
- // Here we can print out all of custom object properties.
- NSLog(@"%@",person.personName); //Print MyName
- NSLog(@"%@",person.personMiddleName); //Print MyMiddleName
- NSLog(@"%@",person.personLastname); //Print MyLastName
- }
- @end
