runtime学习实战一：类的属性进行归档解档

#import <Foundation/Foundation.h>

@interface PYPerson : NSObject

@property (nonatomic, assign) int age;

@property (nonatomic, assign) int height;

@property (nonatomic, copy) NSString *name;

@property (nonatomic, assign) int age2;

@property (nonatomic, assign) int height2;

@property (nonatomic, assign) int age3;

@property (nonatomic, assign) int height3;

@property (nonatomic, assign) int age4;

@property (nonatomic, assign) int height4;

@end

#import "PYPerson.h"

#import <objc/runtime.h>

@implementation PYPerson

- (instancetype)init {

if (self = [super init]) {

_age = 1;

_height = 2;

_name = @"name";

_age2 = 3;

_height2 = 4;

_age3 = 5;

_height3 = 6;

_age4 = 7;

_height4 = 8;

}

return self;

}

- (NSString *)description {

return @"我是一个实例person";

}

- (void)encodeWithCoder:(NSCoder *)encoder {

unsigned int count = 0;

Ivar *ivars = class_copyIvarList([PYPerson class], &count);

for (int i = 0; i<count; i++) {

// 取出i位置对应的成员变量

Ivar ivar = ivars[i];

// 查看成员变量

const char *name = ivar_getName(ivar);

// 归档

NSString *key = [NSString stringWithUTF8String:name];

id value = [self valueForKey:key];

[encoder encodeObject:value forKey:key];

}

free(ivars);

}

- (id)initWithCoder:(NSCoder *)decoder {

if (self = [super init]) {

unsigned int count = 0;

Ivar *ivars = class_copyIvarList([PYPerson class], &count);

for (int i = 0; i<count; i++) {

// 取出i位置对应的成员变量

Ivar ivar = ivars[i];

// 查看成员变量

const char *name = ivar_getName(ivar);

// 归档

NSString *key = [NSString stringWithUTF8String:name];

id value = [decoder decodeObjectForKey:key];

// 设置到成员变量身上

[self setValue:value forKey:key];

}

free(ivars);

}

return self;

}

#import <Foundation/Foundation.h>

#import "PYPerson.h"

#import "APLProduct.h"

int main(int argc, const char * argv[]) {

@autoreleasepool {

// insert code here...

NSLog(@"Hello, World!");

PYPerson *person = [[PYPerson alloc] init];

[[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver                   archivedDataWithRootObject:person] forKey:@"person"];

NSData *personData = [[NSUserDefaults standardUserDefaults] objectForKey:@"person"];

if (personData != nil) {

PYPerson *tmpPerson = [NSKeyedUnarchiver unarchiveObjectWithData:personData];

NSLog(@"%@", tmpPerson);

}

}

return 0;

}