NSKeyedArchiver 归档

所谓的归档，就是将数据写到一个文件里面去。一般我们的应用的变量常量之类的数据都是在内存里面的，只要APP关闭，这些数据都会丢失。但是把数据存储到文件里面去，就能将数据保存到本地磁盘里面（目前iOS基本就是在沙盒里面操作了），不管是APP关闭还是重启设备，下次启动APP的时候都能够读出来。

NSKeyedUnarchiver解档

• 所谓解档(别人也叫反归档)，就是将数据从文件里面读取出来。在程序里面使用。

iOS12之前

归档

+ (NSData *)archivedDataWithRootObject:(id)rootObject API_DEPRECATED("Use +archivedDataWithRootObject:requiringSecureCoding:error: instead", macosx(10.2,10.14), ios(2.0,12.0), watchos(2.0,5.0), tvos(9.0,12.0));

NSMutableArray *array = [NSMutableArray array];for (ServiceModel *model in self.selectedArray) {NSData *data = [NSKeyedArchiver archivedDataWithRootObject:model];[array addObject:data];}[kUserDefaults setObject:array forKey:keySelectedArray];[kUserDefaults synchronize];

解档

+ (nullable id)unarchiveObjectWithData:(NSData *)data API_DEPRECATED("Use +unarchivedObjectOfClass:fromData:error: instead", macosx(10.2,10.14), ios(2.0,12.0), watchos(2.0,5.0), tvos(9.0,12.0));

NSMutableArray *localArray = [NSMutableArray array];
//获取array	
NSArray *array = [[NSUserDefaults standardUserDefaults] objectForKey:keySelectedArray];for (NSData *data in array) {//解码ServiceModel*model = [NSKeyedUnarchiver unarchiveObjectWithData:data];[localArray addObject:model];
}

iOS12之后

归档

+ (nullable NSData *)archivedDataWithRootObject:(id)object requiringSecureCoding:(BOOL)requiresSecureCoding error:(NSError **)error API_AVAILABLE(macos(10.13), ios(11.0), watchos(4.0), tvos(11.0));

NSMutableArray *array = [NSMutableArray array];for (TCMeServiceModel *model in selectedArray) {NSData *data = [NSKeyedArchiver archivedDataWithRootObject:model requiringSecureCoding:YES error:nil];[array addObject:data];}[kUserDefaults setObject:array forKey:keySelectedArray];[kUserDefaults synchronize];

解档

+ (nullable id)unarchivedObjectOfClasses:(NSSet *)classes fromData:(NSData *)data error:(NSError **)error API_AVAILABLE(macos(10.13), ios(11.0), watchos(4.0), tvos(11.0));

NSMutableArray *localArray = [NSMutableArray array];//获取arrayNSArray *array = [[NSUserDefaults standardUserDefaults] objectForKey:keySelectedArray];for (NSData *data in array) {//解码NSSet *classSet = [NSSet setWithObjects:[ServiceModel class],[NSString class], nil];ServiceModel*model = [NSKeyedUnarchiver unarchivedObjectOfClasses:classSet fromData:data error:nil];if (model) {[localArray addObject:model];}}

model

#import NS_ASSUME_NONNULL_BEGIN
@interface ServiceModel : NSObject//NSCopying,NSSecureCoding
/** image */
@property (nonatomic, copy) NSString *image;
/** title */
@property (nonatomic, copy) NSString *title;
/** vc */
@property (nonatomic, copy) NSString *vc;-(instancetype)initWithDict:(NSDictionary *)dict;
+(instancetype)resultListWithDict:(NSDictionary *)dict;@endNS_ASSUME_NONNULL_END

#import "ServiceModel.h"@implementation ServiceModel-(instancetype)initWithDict:(NSDictionary *)dict{self = [super init];if (self) {[self setValuesForKeysWithDictionary:dict];}return self;
}+(instancetype)resultListWithDict:(NSDictionary *)dict{	return [[self alloc]initWithDict:dict];
}+ (BOOL)supportsSecureCoding {return YES;
}//归档
- (void)encodeWithCoder:(nonnull NSCoder *)aCoder {[aCoder encodeObject:_image forKey:@"image"];[aCoder encodeObject:_title forKey:@"title"];[aCoder encodeObject:_vc forKey:@"vc"];
}//解档
- (nullable instancetype)initWithCoder:(nonnull NSCoder *)aDecoder {self = [super init];if (self) {_image = [aDecoder decodeObjectForKey:@"image"];_title = [aDecoder decodeObjectForKey:@"title"];_vc = [aDecoder   decodeObjectForKey:@"vc"];}return self;
}@end

归档存储的是数组，数组中嵌套的是model对象：

另：归档存储的是数组嵌套模型的时候：

①、model对象中要遵循NSSecureCoding协议；

②、model对象.m类中，要实现+ (BOOL)supportsSecureCoding方法，并返回真。

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