通过runtime 遍历自定义model的所有属性实现归档解档操作。
要实现我们自定义的model能够自动解档归档，要遵守NSCoding协议
#import <Foundation/Foundation.h>
@interface siteModel : NSObject<NSCoding>
@property (nonatomic,copy) NSString *siteName;
@property (nonatomic, copy) NSString *siteId;
@end
.m中实现两个协议方法
//归档，将model数据存储本地
- (void)encodeWithCoder:(NSCoder *)aCoder;
//解档，从本地数据中生成model
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder;
.m方法实现
#import "siteModel.h"
#import <objc/runtime.h>
@implementation siteModel
{
NSString *subSiteName;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
if ([super init])
{
unsigned int ivar_count;
Ivar *ivars = class_copyIvarList([self class], &ivar_count);
for (int i = 0; i< ivar_count; i++)
{
Ivar ivar = ivars[i];
NSString *ivarName = [NSString stringWithUTF8String:ivar_getName(ivar)];
[self setValue:[aDecoder decodeObjectForKey:ivarName] forKey:ivarName];
}
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)aCoder
{
unsigned int ivar_count;
Ivar *ivars = class_copyIvarList([self class], &ivar_count);
for (int i = 0; i< ivar_count; i++)
{
Ivar ivar = ivars[i];
NSString *ivarName = [NSString stringWithUTF8String:ivar_getName(ivar)];
[aCoderencodeObject:[self valueForKey:ivarName] forKey:ivarName];
}
}
@end
在controller中使用
//归档
siteModel *fatherSite = [[siteModel alloc]init];
fatherSite.siteName = @"北京";
fatherSite.siteId = @"12300";
NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES) firstObject];
NSString *filePath = [documentPath stringByAppendingString:@"modelFile"];
[NSKeyedArchiver archiveRootObject:fatherSite toFile:filePath];
//解档
NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES) firstObject];
NSString *filePath = [documentPath stringByAppendingString:@"modelFile"];
siteModel *localSite = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
NSLog(@"siteName:%@ siteId:%@",localSite.siteName,localSite.siteId);
siteName:北京 siteId:12300
