一、归档NSKeyedArchiver和解归档NSKeyedUnarchiver
1.首先确定存储路径。
NSHomeDirectory和NSSearchPathForDirectoriesInDomains的区别
1.NSHomeDirectory
NSString *path1 = NSHomeDirectory();
NSLog(@"path1:%@", path1);
//path1:/Users/yuanjun/Library/Application Support/iPhone Simulator/4.2/Applications/172DB70A-145B-4575-A31E-D501AC6EA830
2.NSSearchPathForDirectoriesInDomains
NSString *path2 = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
NSLog(@"path2:%@", path2);
//path2:/Users/yuanjun/Library/Application Support/iPhone Simulator/4.2/Applications/172DB70A-145B-4575-A31E-D501AC6EA830/Library/Caches
NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSLog(@"path3:%@", path3);
//path3:/Users/yuanjun/Library/Application Support/iPhone Simulator/4.2/Applications/172DB70A-145B-4575-A31E-D501AC6EA830/Documents
2.需要归档的对象
h文件,最后归档协议NSCoding
#import <Foundation/Foundation.h>
@interface Dog : NSObject <NSCoding>
@property (nonatomic, copy) NSString *dogName;
@property (nonatomic, assign) NSInteger dogAge;
@end
m文件,实现归档和反归档协议方法
//归档
//对dog对象进行归档时,此方法执行
//对dog中想要进行归档的所有属性,进行序列化操作
- (void)encodeWithCoder:(NSCoder *)aCoder {
[aCoder encodeObject:self.dogName forKey:@"dogName"]; //归档普通对象
[aCoder encodeInteger:self.dogAge forKey:@"dogAge"]; //归档数字
}
//反归档
//对dog对象进行反归档时,该方法执行
//创建一个新的dog对象,所有属性都是通过反序列化得到
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if (self = [super init]) {
self.dogName = [aDecoder decodeObjectForKey:@"dogName"];
self.dogAge = [aDecoder decodeIntegerForKey:@"dogAge"];
}
return self;
}
控制器中操作,存储数据和取出数据
Dog *heiZi = [[Dog alloc] init];
heiZi.dogName = @"黑子";
heiZi.dogAge = 5;
// 确定存储路径
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
path = [path stringByAppendingString:@"dogInfo"];
// 初始化数据对象
NSMutableData *dogData = [[NSMutableData alloc] init];
// 初始化归档对象
NSKeyedArchiver *archive = [[NSKeyedArchiver alloc] initForWritingWithMutableData:dogData];
// 开始归档
[archive encodeObject:heiZi forKey:@"heiZi"];
[archive finishEncoding];
// 判断是否成功
BOOL finish = [dogData writeToFile:path atomically:YES];
if (finish) {
NSLog(@"666_SunDePrint_999:%@", @"归档成功");
}else{
NSLog(@"666_SunDePrint_999:%@", @"归档失败");
}
//也可以用直接类方法根据路径直接归档
//[NSKeyedArchiver archiveRootObject:heiZi toFile:path];
// 通过路径取出存储数据
NSData *data = [NSData dataWithContentsOfFile:path];
// 反归档
NSKeyedUnarchiver *unArchive = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
Dog *newDog = [unArchive decodeObjectForKey:@"heiZi"];
//可以直接用类方法,根据路径直接解归档
// Dog *newDog = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
NSLog(@"666_SunDePrint_999:%@--%ld", newDog.dogName, newDog.dogAge);
结果:
二、利用runtime归档 (结合KVC)
利用runtime class_copyPropertyList 方法获得对象的属性列表。遍历数组,根据得到的属性名结合KVC方法进行归档和解归档。
#import "Dog.h"
#import <objc/runtime.h>
@implementation Dog
//归档
//对dog对象进行归档时,此方法执行
//对dog中想要进行归档的所有属性,进行序列化操作
- (void)encodeWithCoder:(NSCoder *)aCoder {
unsigned int proCount;
objc_property_t *pros = class_copyPropertyList([self class], &proCount);
for (int i = 0; i < proCount; i++) {
objc_property_t pro = pros[i];
NSString *proName = [NSString stringWithCString:property_getName(pro) encoding:NSUTF8StringEncoding];
NSLog(@"666_SunDePrint_999:%@", proName);
[aCoder encodeObject:[self valueForKey:proName] forKey:proName];
}
free(pros);
}
//解归档
//对dog对象进行解归档时,该方法执行
//创建一个新的dog对象,所有属性都是通过反序列化得到
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if (self = [super init]) {
unsigned int proCount;
objc_property_t *pros = class_copyPropertyList([self class], &proCount);
for (int i = 0; i < proCount; i++) {
objc_property_t pro = pros[i];
NSString *proName = [NSString stringWithCString:property_getName(pro) encoding:NSUTF8StringEncoding];
[self setValue:[aDecoder decodeObjectForKey:proName] forKey:proName];
}
free(pros);
}
return self;
}
@end