iOS 自定义序列化 runtime 属性列表 归档解档

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从今天起关心底层和原理！
还是person类
@interface Person : NSObject

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

@end
person.m==============
#import “Person.h”
#import <objc/runtime.h>

@implementation Person

• (void)encodeWithCoder:(NSCoder *)aCoder {
  //1、常用
  // [aCoder encodeObject:_name forKey:@“name”];
  // [aCoder encodeInt:_age forKey:@“age”];
  //2、如果属性很多
  unsigned int count = 0;
  Ivar *list = class_copyIvarList(self.class, &count);
  for (NSInteger i = 0; i < count; i++) {
  Ivar ivar = list[i];
  const char *name = ivar_getName(ivar);
  NSLog(@"==========%s", name);
  NSString *key = [NSString stringWithUTF8String:name];
  id value = [self valueForKey:key];
  [aCoder encodeObject:value forKey:key];
  }
  free(list);
  }

• (instancetype)initWithCoder:(NSCoder *)aDecoder {
  self = [super init];
  if (self) {
  // self.name = [aDecoder decodeObjectForKey:@“name”];
  // self.age = [aDecoder decodeIntForKey:@“age”];
  unsigned int count = 0;
  Ivar *list = class_copyIvarList(self.class, &count);
  for (NSInteger i = 0; i < count; i++) {
  Ivar ivar = list[i];
  NSString *key = [NSString stringWithUTF8String:ivar_getName(ivar)];
  //解档
  id value = [aDecoder decodeObjectForKey:key];
  [self setValue:value forKey:key];
  }
  free(list);
  }
  return self;
  }
  @end

ViewController.m中引用，添加两个按钮，存和取===================
#import “ViewController.h”
#import “Person.h”
/*
*关于runtime
*Ivar:成员变量
*method:成员方法
*/

#import <objc/runtime.h>
@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIButton *btn1;
@property (weak, nonatomic) IBOutlet UIButton *btn2;

/**

• 以类为单位，维护一份方法列表
  *SEL 编号 --------- IMP 指针（方法实现）
  */

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  NSLog(@"======%@", NSTemporaryDirectory());
  //查看一个累的所有属性列表
  unsigned count = 0;
  //copy，new，create在堆区（malloc）开辟空间
  Ivar *list = class_copyIvarList(Person.class, &count);
  Ivar ivar = list[0];
  const char *listName = ivar_getName(ivar);
  NSLog(@"成员变量个数---------%d=成员变量%s", count, listName);
  //防止内存泄漏
  free(list);
  // Do any additional setup after loading the view, typically from a nib.
  }

• (IBAction)btn1:(UIButton *)sender {
  Person *per = [[Person alloc] init];
  per.name = @“张三”;
  per.age = 18;
  NSString *temPath = NSTemporaryDirectory();
  NSString *filePath = [temPath stringByAppendingPathComponent:@“temp.file”];
  [NSKeyedArchiver archiveRootObject:per toFile:filePath];
  }

• (IBAction)btn2:(UIButton *)sender {
  NSString *temPath = NSTemporaryDirectory();
  NSString *filePath = [temPath stringByAppendingPathComponent:@“temp.file”];
  Person *per = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
  NSLog(@"-----------%@-----%d", per.name, per.age);

}

demo地址：