歸檔

• 1.1. 簡單歸檔：指把簡單的字符串拱层、數(shù)組等對象進(jìn)行歸檔

    // 初始化需要歸檔的數(shù)組
    NSArray *array = @[@"a", @"b", @"c"];
    // 創(chuàng)建歸檔文件存儲路徑
    NSString *path = PATH_AT_Tmp(@"file.archive"); // 文件后綴隨意
    // 歸檔
    [NSKeyedArchiver archiveRootObject:array toFile:path];
    // 解歸檔
    NSArray *tempArray = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
    // 輸出打印
    NSLog(@"kkk --- %@", tempArray);

• 1.2. data歸檔：先新建一個可變的data對象弥臼，然后通過創(chuàng)建一個NSKeyedArchiver實例對象對各種類型的數(shù)據(jù)進(jìn)行歸檔到data的歸檔文件中

    // 創(chuàng)建歸檔文件存儲路徑
    NSString *path = PATH_AT_Tmp(@"file.archive");
    // 創(chuàng)建可變data
    NSMutableData *data = [NSMutableData data];
    // 創(chuàng)建歸檔實例
    NSKeyedArchiver *keyArch = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    // 歸檔
    [keyArch encodeObject:@"勇往直前" forKey:@"name"];
    [keyArch encodeInteger:18 forKey:@"age"];
    [keyArch finishEncoding];
    [data writeToFile:path atomically:YES];

    // 解歸檔
    NSData *outData = [NSData dataWithContentsOfFile:path];
    NSKeyedUnarchiver *keyUnarch = [[NSKeyedUnarchiver alloc] initForReadingWithData:outData];
    NSString *name = [keyUnarch decodeObjectForKey:@"name"];
    NSInteger age = [keyUnarch decodeIntegerForKey:@"age"];
    NSLog(@"name: %@, age: %ld", name, (long)age);

• 1.3. 自定義歸檔
  定義一個類UserInfoModel，需遵守NSCoding協(xié)議

UserInfoModel.h文件中定義name根灯、age和sex三個屬性
#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface UserInfoModel : NSObject<NSCoding>

@property (nonatomic, copy) NSString *name;
@property (nonatomic, assign) NSInteger age;
@property (nonatomic, copy) NSString *sex;

@end

NS_ASSUME_NONNULL_END

UserInfoModel.m文件需要重寫一個歸檔方法径缅、一個解歸檔方法
#import "UserInfoModel.h"

@implementation UserInfoModel

// 重寫歸檔方法，把調(diào)用者的屬性進(jìn)行歸檔
- (void)encodeWithCoder:(NSCoder *)coder
{
    [coder encodeObject:self.name forKey:@"name"];
    [coder encodeInteger:self.age forKey:@"age"];
    [coder encodeObject:self.sex forKey:@"sex"];
}

// 重寫解歸檔方法烙肺，把屬性賦值給新對象的對應(yīng)屬性
- (instancetype)initWithCoder:(NSCoder *)coder
{
    self = [super init];
    if (self) {
        self.name = [coder decodeObjectForKey:@"name"];
        self.age = [coder decodeIntegerForKey:@"age"];
        self.sex = [coder decodeObjectForKey:@"sex"];
    }
    return self;
}

@end

• 1.3.1歸檔與解歸檔的應(yīng)用

// 初始化對象
UserInfoModel *model = [[UserInfoModel alloc] init];
model.name = @"遇見";
model.age = 18;
model.sex = @"Man";

// 創(chuàng)建歸檔文件存儲路徑
NSString *path = PATH_AT_Tmp(@"file.archive");
// 歸檔
[NSKeyedArchiver archiveRootObject:model toFile:path];
// 解歸檔
UserInfoModel *outModel = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
// 輸出
NSLog(@"name: %@, age: %ld, sex: %@", outModel.name, (long)outModel.age, outModel.sex);

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