序列化与反序列化

对象的序列化与反序列化

首先创建一个对象做数据源

---

.h头文件 遵循NSSecureCoding协议

@interface ABoss : NSObject

@property (nonatomic, strong) NSString *name;
@property (nonatomic, assign) CGFloat money;
@property (nonatomic, strong) NSString *company;

+(void)saveObj:(ABoss *)boss withFileName:(NSString *)fileName;
+(ABoss *)readObjWithFileName:(NSString *)fileName;

@end

.m文件 必须实现的方法有：
-(void)encodeWithCoder:(NSCoder *)aCoder
-(instancetype)initWithCoder:(NSCoder *)aDecoder
+(BOOL)supportsSecureCoding

@implementation ABoss

-(void)encodeWithCoder:(NSCoder *)aCoder{
    NSLog(@"encode");
    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeFloat:self.money forKey:@"money"];
    [aCoder encodeObject:self.company forKey:@"company"];
}

-(instancetype)initWithCoder:(NSCoder *)aDecoder{
    NSLog(@"decodera");
    if (self==[super init]) {
        self.name=[aDecoder decodeObjectForKey:@"name"];
        self.money=[aDecoder decodeFloatForKey:@"money"];
        self.company=[aDecoder decodeObjectForKey:@"company"];
        NSLog(@"decoderb");
    }
    NSLog(@"decodec");
    return self;
}

/**
 支持NSSecureCoding协议 必须支持

 @return 必须支持
 */
+(BOOL)supportsSecureCoding{
    return YES;
}

/**
 序列化该类的对象

 @param boss ABoss 实例
 @param fileName 保存的文件名
 */
+(void)saveObj:(ABoss *)boss withFileName:(NSString *)fileName{
    NSString *filePath=[NSHomeDirectory() stringByAppendingPathComponent:fileName];
    {
        NSData *data=[NSKeyedArchiver archivedDataWithRootObject:boss requiringSecureCoding:YES error:nil];
        [data writeToFile:filePath atomically:YES];
    }
}

/**
 反序列化该类的对象

 @param fileName 需反序列化的文件
 @return return ABoss 实例
 */
+(ABoss *)readObjWithFileName:(NSString *)fileName{
    NSString *filePath=[NSHomeDirectory() stringByAppendingPathComponent:fileName];
    NSData *oldData=[NSData dataWithContentsOfFile:filePath];
    NSError *error;
    return [NSKeyedUnarchiver unarchivedObjectOfClass:[ABoss class] fromData:oldData error:&error];
}

@end

既然数据已做好，那么可以直接使用了

-(void)saveAData{
    ABoss *boss=[[ABoss alloc] init];
    boss.name=@"chen bai qiang";
    boss.money=6658654869.00;
    boss.company=@"tianxiadiyi";
    [ABoss saveObj:boss withFileName:@"abboss.archive"];
}

-(void)readData{
    ABoss *boss=[ABoss readObjWithFileName:@"abboss.archive"];
    NSLog(@"boss information's name:%@,money:%.2f,company:%@",boss.name,boss.money,boss.company);
}

运行 打印如下

encode
decodera
decoderb
decodec
boss information's name:chen bai qiang,money:6658654720.00,company:tianxiadiyi

上面的对象序列化也可以写到pch文件

#ifndef PrefixHeader_pch
#define PrefixHeader_pch
#import 
#define SERIALIZER_CODER_DECODER()     \
\
- (id)initWithCoder:(NSCoder *)coder    \
{   \
Class cls = [self class];   \
while (cls != [NSObject class]) {   \
/*判断是自身类还是父类*/    \
BOOL bIsSelfClass = (cls == [self class]);  \
unsigned int iVarCount = 0; \
unsigned int propVarCount = 0;  \
unsigned int sharedVarCount = 0;    \
Ivar *ivarList = bIsSelfClass ? class_copyIvarList([cls class], &iVarCount) : NULL;/*变量列表，含属性以及私有变量*/   \
objc_property_t *propList = bIsSelfClass ? NULL : class_copyPropertyList(cls, &propVarCount);/*属性列表*/   \
sharedVarCount = bIsSelfClass ? iVarCount : propVarCount;   \
\
for (int i = 0; i < sharedVarCount; i++) {  \
const char *varName = bIsSelfClass ? ivar_getName(*(ivarList + i)) : property_getName(*(propList + i)); \
NSString *key = [NSString stringWithUTF8String:varName];   \
id varValue = [coder decodeObjectForKey:key];   \
NSArray *filters = @[@"superclass", @"description", @"debugDescription", @"hash"]; \
if (varValue && [filters containsObject:key] == NO) { \
[self setValue:varValue forKey:key];    \
}   \
}   \
free(ivarList); \
free(propList); \
cls = class_getSuperclass(cls); \
}   \
return self;    \
}   \
\
- (void)encodeWithCoder:(NSCoder *)coder    \
{   \
Class cls = [self class];   \
while (cls != [NSObject class]) {   \
/*判断是自身类还是父类*/    \
BOOL bIsSelfClass = (cls == [self class]);  \
unsigned int iVarCount = 0; \
unsigned int propVarCount = 0;  \
unsigned int sharedVarCount = 0;    \
Ivar *ivarList = bIsSelfClass ? class_copyIvarList([cls class], &iVarCount) : NULL;/*变量列表，含属性以及私有变量*/   \
objc_property_t *propList = bIsSelfClass ? NULL : class_copyPropertyList(cls, &propVarCount);/*属性列表*/ \
sharedVarCount = bIsSelfClass ? iVarCount : propVarCount;   \
\
for (int i = 0; i < sharedVarCount; i++) {  \
const char *varName = bIsSelfClass ? ivar_getName(*(ivarList + i)) : property_getName(*(propList + i)); \
NSString *key = [NSString stringWithUTF8String:varName];    \
/*valueForKey只能获取本类所有变量以及所有层级父类的属性，不包含任何父类的私有变量(会崩溃)*/  \
id varValue = [self valueForKey:key];   \
NSArray *filters = @[@"superclass", @"description", @"debugDescription", @"hash"]; \
if (varValue && [filters containsObject:key] == NO) { \
[coder encodeObject:varValue forKey:key];   \
}   \
}   \
free(ivarList); \
free(propList); \
cls = class_getSuperclass(cls); \
}   \
}   \
+(BOOL)supportsSecureCoding{  \
    return YES;  \
}

#endif /* PrefixHeader_pch */

.m文件

然后在需要实现的文件加 SERIALIZER_CODER_DECODER()

@implementation ABoss

SERIALIZER_CODER_DECODER()

/**
 序列化该类的对象

 @param boss ABoss 实例
 @param fileName 保存的文件名
 */
+(void)saveObj:(ABoss *)boss withFileName:(NSString *)fileName{
    NSString *filePath=[NSHomeDirectory() stringByAppendingPathComponent:fileName];
    {
        NSData *data=[NSKeyedArchiver archivedDataWithRootObject:boss requiringSecureCoding:YES error:nil];
        [data writeToFile:filePath atomically:YES];
    }
}

/**
 反序列化该类的对象

 @param fileName 需反序列化的文件
 @return return ABoss 实例
 */
+(ABoss *)readObjWithFileName:(NSString *)fileName{
    NSString *filePath=[NSHomeDirectory() stringByAppendingPathComponent:fileName];
    NSData *oldData=[NSData dataWithContentsOfFile:filePath];
    NSError *error;
    return [NSKeyedUnarchiver unarchivedObjectOfClass:[ABoss class] fromData:oldData error:&error];
}

@end

---

Json序列化与反序列化

-(void)lib{
    NSDictionary *sender=@{@"a":@"11",
                           @"b":@"22",
                           @"c":@"33"
                           };
    NSLog(@"原数据:%@",sender);
    [self jsonSerializationWithDict:sender];
}

-(void)jsonSerializationWithDict:(id)sender{
    NSError *error;
    NSData *data=[NSJSONSerialization dataWithJSONObject:sender options:NSJSONWritingPrettyPrinted error:&error];
    NSString *jsonString=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"JSON序列化:%@",jsonString);
    [self jsonReverseSerializationWithDict:jsonString];
}

-(void)jsonReverseSerializationWithJsonString:(NSString *)sender{
    NSData *data=[sender dataUsingEncoding:NSUTF8StringEncoding];
    NSError *error;
    NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];
    NSLog(@"JSON反序列化:%@",dict);
}

运算结果如下

原数据:{
    a = 11;
    b = 22;
    c = 33;
}
 JSON序列化:{
  "a" : "11",
  "b" : "22",
  "c" : "33"
}
 JSON反序列化:{
    a = 11;
    b = 22;
    c = 33;
}