我有一些数据可以说乘客和内部乘客我有孩子的阵列和婴儿的阵列，我只是竹子，只是没有任何线索将乘客列表转换为JSON。
到目前为止，在Objective-c中，我看到我们通过它将类对象转换为NSDictionary toDictionary方法。
我的问题是，如果我们有类对象列表，那么这里有什么问题？我们将如何转换该列表？
我有NSMutableArray的乘客和乘客对象内我有NSMutableArray的儿童和婴儿。
如何根据要求将乘客列表转换为Dictionary？
我是objective-c的新手，在java中我们用来序列化和反序列化。
我已经尝试过将NSMutableArray转换为NSDictionary等等，但它似乎根本不起作用。
{
"airline_code":"AA",
"inbound_trip_id":122222,
"outbound_trip_id":111111,
"passengers":[
{
"address_line1":"fdsdsf",
"address_line2":"",
"children":[
{
"city":"abx",
"country":"abcd",
"country_access_code":"11",
"country_code":"AK",
"date_of_birth":"4#8#2017",
"email_address":"[email protected]",
"first_name":"munna",
"gender":"Male",
"inbound_ssr_id":[
40420
],
"last_name":"khna",
"middle_name":"",
"nationality":"aaaa",
"outbound_ssr_id":[
40417
],
"passport_expiry_date":"4#29#2019",
"passport_issue_date":"4#8#2019",
"passport_number":"PPA2345",
"phone_number":"111111111",
"state":"aaa",
"title":"Mr",
"titleIndex":0,
"zip_code":"123213"
}
],
"city":"Dadu",
"country":"aa",
"country_access_code":"11",
"country_code":"aa",
"date_of_birth":"4#8#1973",
"email_address":"[email protected]",
"firstAdult":0,
"first_name":"aaa",
"gender":"Male",
"inbound_ssr_id":[
40421
],
"billing_info":false,
"last_name":"ccc",
"middle_name":"",
"nationality":"PK",
"outbound_ssr_id":[
40416
],
"passport_expiry_date":"4#29#2019",
"passport_issue_date":"4#8#2019",
"passport_number":"PPA12345",
"phone_number":"111111111",
"state":"OOA",
"title":"Mr",
"zip_code":"324546"
},
{
"address_line1":"dfdsfdsf",
"address_line2":"",
"city":"Beletwene",
"country":"Somalia",
"country_access_code":"252",
"country_code":"SO",
"date_of_birth":"4#8#1989",
"email_address":"[email protected]",
"firstAdult":0,
"first_name":"vv",
"gender":"Male",
"genederIndex":0,
"inbound_ssr_id":[
40419
],
"billing_info":false,
"last_name":"fdf",
"middle_name":"",
"nationality":"PP",
"outbound_ssr_id":[
40418
],
"passport_expiry_date":"4#29#2019",
"passport_issue_date":"4#8#2019",
"passport_number":"PPA123435",
"phone_number":"615100002",
"state":"PPA",
"title":"Mr",
"titleIndex":0,
"zip_code":"23454"
}
],
"search_id":"0000000000000000000000000000000000000",
"token_id":"0000000000000000000000000000000000000"
}
我在类对象中同时执行toDictionary和fromDictionary。如果一个对象具有嵌套的类对象，那么它们同样需要实现一个toDictionary和fromDictionary方法。以下是包含Trip类数组的Claim类的示例：
Claim.h
#import <Foundation/Foundation.h>
@interface Claim : NSObject <NSCopying>
{
}
-(id) copy;
-(id) copyWithZone: (NSZone *) zone;
@property (nonatomic, strong) NSNumber *claimID;
@property (nonatomic, strong) NSString *claimantName;
@property (nonatomic, strong) NSNumber *totalAmount;
@property (nonatomic, strong) NSMutableArray *trips;
@property (nonatomic, assign) BOOL isDirty;
-(void) fromDictionary:(NSDictionary *)dict;
-(NSMutableDictionary *) toDictionary;
-(void) getClaim:(NSInteger)claim_id;
-(void) getTrips;
-(BOOL) saveClaim;
-(BOOL) addClaim;
-(BOOL) updateClaim;
-(BOOL) deleteClaim;
@end
这是Claim类的实现：
#import "Claim.h"
#import "AppDelegate.h"
#import "Trip.h"
@implementation Claim
@synthesize claimID;
@synthesize claimantName;
@synthesize totalAmount;
@synthesize trips;
@synthesize isDirty;
- (id)init {
if (self = [super init]) {
self.claimID = [NSNumber numberWithInteger:0];
self.claimantName = @"";
self.totalAmount = [NSNumber numberWithInteger:0];
self.trips = [[NSMutableArray alloc] init];
self.isDirty = NO;
}
return self;
}
-(id) copy
{
Claim *newClaim = [[Claim alloc] init];
newClaim.claimID = [self.claimID copy];
newClaim.claimantName = [self.claimantName copy];
newClaim.totalAmount = [self.totalAmount copy];
newClaim.trips = [[NSMutableArray alloc] initWithArray:self.trips copyItems:YES];
newClaim.isDirty = self.isDirty;
return newClaim;
}
-(id) copyWithZone: (NSZone *) zone
{
Claim *newClaim = [[Claim alloc] init];
newClaim.claimID = [self.claimID copy];
newClaim.claimantName = [self.claimantName copy];
newClaim.totalAmount = [self.totalAmount copy];
newClaim.adjMiles = [self.adjMiles copy];
newClaim.trips = [[NSMutableArray alloc] initWithArray:self.trips copyItems:YES];
newClaim.isDirty = self.isDirty;
return newClaim;
}
-(NSMutableDictionary *)toDictionary
{
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
[dict setObject:self.claimID forKey:@"claim_id"];
[dict setObject:self.claimantName forKey:@"claimant_name"];
[dict setObject:self.totalAmount forKey:@"total_amount"];
NSMutableArray *tripArray = [[NSMutableArray alloc] init];
for (Trip * item in self.trips) {
NSDictionary *theDict = [item toDictionary];
[tripArray addObject:theDict];
}
[dict setObject:tripArray forKey:@"trips"];
if (self.isDirty== YES) {
[dict setValue:@YES forKey:@"is_dirty"];
} else {
[dict setValue:@NO forKey:@"is_dirty"];
}
return dict;
}
-(void)fromDictionary:(NSDictionary *)dict
{
self.claimID = [dict objectForKey:@"claim_id"];
if ([self.claimID isEqual:[NSNull null]]) {
self.claimID = [NSNumber numberWithInt:0];
}
self.claimantName = [dict objectForKey:@"claimant_name"];
if ([self.claimantName isEqual:[NSNull null]]) {
self.claimantName = @"";
}
self.totalAmount = [dict objectForKey:@"total_amount"];
if ([self.totalAmount isEqual:[NSNull null]]) {
self.totalAmount = [NSNumber numberWithDouble:0.00];
}
self.trips = [[NSMutableArray alloc] init];
for (NSDictionary *dict in arrayTrips) {
Trip *item = [[Trip alloc] init];
[item fromDictionary:dict];
[self.trips addObject:item];
}
long ruDirty = [[dict valueForKey:@"is_dirty"] integerValue];
if (ruDirty == 1) {
self.isDirty = YES;
} else {
self.isDirty = NO;
}
}
- (NSString *)clearNulls:(const char *)value {
NSString *result;
if (value == NULL) {
result = @"";
} else if (value == nil) {
result = @"";
} else {
result = [[NSString alloc] initWithUTF8String:value];
}
return result;
}
-(void)getClaim:(NSInteger)claim_id
{
}
-(void)getTrips
{
}
-(BOOL) saveClaim {
if ([self.claimID integerValue] == 0) {
return [self addClaim];
} else {
return [self updateClaim];
}
}
-(BOOL) addClaim {
return dataSaved;
}
-(BOOL) updateClaim {
return dataSaved;
}
-(BOOL) deleteClaim {
return didDelete;
}
@end
NSJSONSerialization类可以将NSDictionary转换为JSON。见https://developer.apple.com/documentation/foundation/nsjsonserialization
您可以使用codable序列化Class到JSON字符串并执行相反的操作。认为Swift example中的JSONEncoder可以从Objective-C访问。
How to use Codable protocol in objective c data model class?