NScoder objective-c 运行 时间

Question

NSCoder *coder; 
coder=[[NSCoder alloc]init];
[coder encodeObject:@"value" forKey:@"frame"];

错误

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -encodeObject:forKey: cannot be sent to an abstract object of class NSCoder: Create a concrete instance!`

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这在 运行 期间中断 time.can 任何人帮助我找到我做错了什么？

Answer 1

需要创建一个模型class，并且在这个模型class中，需要实现一个NSCodingProtocol

例如书 Class

Book.h

@interface Book : NSObject<NSCoding>

@property (nonatomic, retain) NSString *name;
@property (nonatomic, retain) NSString *author;

@end

Book.m

- (id)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super init]) {
        self.title = [aDecoder decodeObjectForKey:@"name"];
        self.author = [aDecoder decodeObjectForKey:@author"];
    }
    return self;
}

- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:_name forKey:@"name"];
    [aCoder encodeObject:_author forKey:@"author"];
}