项目介绍：
XBCodingObject
Github
先前做APP做离线的时候经常遇到有需求要把自定义模型存入数据库,但是需要实现NSCoding协议的两个方法,模型属性少的时候还有耐心写,但是当有100个属性的时候难道还一个个写吗,程序员写代码就是要避免重复的代码,这里作者只是帮助开发者省去了这些枯燥简单没有技术的代码,其次能更有效的提高开发效率.
只要把这个类拖进工程,在创建数据模型的时候直接继承就OK了,内部就自动帮你实现了NSCoding协议的两个方法了,详细用法看下文!自定义类person类#import 'XBCodingObject.h'
#import 'XBDog.h'
@interface XBPerson : XBCodingObject
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *age;
/**
狗类
*/
@property (nonatomic, strong) XBDog *dog;
/**
数组里面装的是猫类
*/
@property (nonatomic, strong) NSArray *cats;
@end
自定义dog类#import 'XBCodingObject.h'
@interface XBDog : XBCodingObject
@property (nonatomic, copy) NSString *dogName;
@property (nonatomic, copy) NSString *dogAge;
@end
自定义cat类#import 'XBCodingObject.h'
@interface XBCat : XBCodingObject
@property (nonatomic, copy) NSString *catName;
@property (nonatomic, copy) NSString *catAge;
@end
用法#import 'ViewController.h'
#import 'XBPerson.h'
#import 'XBCat.h'
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSMutableArray *array = [NSMutableArray arrayWithCapacity:3];
for (int i = 0; i < 3; ++i) {
XBPerson *person1 = [[XBPerson alloc] init];
person1.name = @'123';
person1.age = @'aaaa';
XBDog *dog = [[XBDog alloc] init];
dog.dogName = @'哈哈哈';
dog.dogAge = @'111';
person1.dog = dog;
NSMutableArray *tempArray = [NSMutableArray arrayWithCapacity:3];
for (int i = 0; i < 3; ++i) {
XBCat *cat = [[XBCat alloc] init];
cat.catName = @'444';
cat.catAge = @'555';
[tempArray addObject:cat];
}
person1.cats = tempArray;
[array addObject:person1];
}
// 这里可以直接实现归档方法
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:array];
// 解档
NSArray *arr = [NSKeyedUnarchiver unarchiveObjectWithData:data];
NSLog(@'%@', arr);
}
核心代码// 获取所有属性列表
- (NSArray *)properties {
NSMutableArray *properties = [NSMutableArray array];
unsigned int count = 0;
Ivar *propertyArr = class_copyIvarList([self class], &count);
objc_property_t *propertyArray = class_copyPropertyList([self class], &count);
for (int i = 0; i < count; i++) {
Ivar property = propertyArr[i];
const char *propertyNameC = ivar_getName(property);
NSString *propertyNameOC = [[NSString alloc] initWithCString:propertyNameC encoding:NSUTF8StringEncoding];
[properties addObject:propertyNameOC];
}
free(propertyArray);
return properties;
}
// 把所有属性归档
- (void)encodeWithCoder:(NSCoder *)aCoder {
NSArray *propertyArray = [self properties];
for (NSString *property in propertyArray) {
[aCoder encodeObject:[self valueForKey:property] forKey:property];
}
}
// 对所有属性解档
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if (self == [super init]) {
for (NSString *property in [self properties]) {
[self setValue:[aDecoder decodeObjectForKey:property] forKey:property];
}
}
return self;
}
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