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反射实现NSCodingProtocol 帮助类

// .h文件
#import
<Foundation/Foundation.h>@interface NSCodingProtocolHelper : NSObject+(void)encodeWithCoder:(NSCoder *)aCoder andObj:(id)obj;+(id)initWithCoder:(NSCoder *)aDecoder andObj:(id)obj;@end

 

// .m文件
#import "NSCodingProtocolHelper.h"#import <objc/runtime.h> //反射需要用到的头文件@implementation NSCodingProtocolHelper+(void)encodeWithCoder:(NSCoder *)aCoder andObj:(id)obj{ unsigned int outCount; objc_property_t *properties = class_copyPropertyList([obj class], &outCount); for (int i = 0; i < outCount; i++) { objc_property_t *thisProperty = properties + i; NSString *propertyName = [NSString stringWithUTF8String:property_getName(*thisProperty)]; [aCoder encodeObject:[obj valueForKey:propertyName] forKey:propertyName]; }}+(id)initWithCoder:(NSCoder *)aDecoder andObj:(id)obj{ unsigned int outCount; objc_property_t *properties = class_copyPropertyList([obj class], &outCount); for (int i = 0; i < outCount; i++) { objc_property_t *thisProperty = properties + i; NSString *propertyName = [NSString stringWithUTF8String:property_getName(*thisProperty)]; [obj setValue:[aDecoder decodeObjectForKey:propertyName] forKey:propertyName]; } return obj;}@end

使用方法:

在要实现NSCodingProtocle的类中重写 initWithCoder: 和encodeWithCoder: 方法,

例如:

-(void) encodeWithCoder:(NSCoder *)aCoder{    [NSCodingProtocolHelper encodeWithCoder:aCoder andObj:self];    }-(id)initWithCoder:(NSCoder *)aDecoder{    return [NSCodingProtocolHelper initWithCoder:aDecoder andObj:selfl];}

 

  

反射实现NSCodingProtocol 帮助类