《IOS开发系列教程》序列化反序列化对象

《IOS开发系列教程》序列化反序列化对象

 

Cocoa touch提供了序列化和反序列化的方法：

archiveRootObject

unarchiveObjectWithFile

使用这2个方法之前，要保证你的对象是实现了NSCoding协议，例如你定义了一个类，

在头文件中：

@interface myClass : NSObject <NSCoding>

在实现文件中：

@implementation 

-(void)encodeWithCoder:(NSCoder *)encoder

{

}

- (id)initWithCoder:(NSCoder *)decoder

{

}

 

下面给出了一个列子：

-(void)encodeWithCoder:(NSCoder *)encoder{
    [encoder encodeObject:self.difficulty forKey:@"difficulty"];
    [encoder encodeObject:self.language forKey:@"language"];
    [encoder encodeObject:self.category forKey:@"category"];
    [encoder encodeObject:self.playerType forKey:@"playerType"];
}

- (id)initWithCoder:(NSCoder *)decoder {
    if (self = [super init]) {
        self.difficulty = [decoder decodeObjectForKey:@"difficulty"];
        self.language = [decoder decodeObjectForKey:@"language"];
        self.category = [decoder decodeObjectForKey:@"category"];
        self.playerType = [decoder decodeObjectForKey:@"playerType"];
    }
    return self;
}

下面是将对象序列化写进文件，然后在反序列化从文件读出

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:@"set.txt"];

NSMutableArray *myObject=[NSMutableArray array];
[myObject addObject:self.settings];    

这里是写
[NSKeyedArchiver archiveRootObject:myObject toFile:appFile]; 

这里是读
NSMutableArray* myArray = [NSKeyedUnarchiver unarchiveObjectWithFile:appFile]; 

 

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