本地存储数据--解归档

在model文件的.m文件中对模型中的属性字段做下列操作:

- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.orderid forKey:@"orderid"];
    [aCoder encodeInteger:self.busid forKey:@"busid"];
    [aCoder encodeObject:self.mobile forKey:@"mobile"];
    [aCoder encodeInteger:self.sitefrom forKey:@"sitefrom"];
    [aCoder encodeFloat:self.distance forKey:@"distance"];
}

- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super init]) {
        self.orderid = [aDecoder decodeObjectForKey:@"orderid"];
        self.busid = [aDecoder decodeIntegerForKey:@"busid"];
        self.mobile = [aDecoder decodeObjectForKey:@"mobile"];
        self.sitefrom = [aDecoder decodeIntegerForKey:@"sitefrom"];
        self.distance = [aDecoder decodeFloatForKey:@"distance"];
    }
    return self;
}

如果app中使用了MJExtension框架，该框架已经为我们实现了解归档操作，则不需要写上述代码，只需要在.m文件中导入头文件”MJExtension”，然后在.m文件的@implementation与@end之间添加一句MJCodingImplementation代码 就OK.

将数据持久化到本地:

//保存数据
    [NSKeyedArchiver archiveRootObject:_ticketArray toFile:[self savePath]];

- (NSString *)savePath
{
    NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject]stringByAppendingPathComponent:@"ticketArray.plist"];
    return path;
}

取出本地存储的数据:

//取数据：
    NSMutableArray *arr = [NSKeyedUnarchiver unarchiveObjectWithFile:[self savePath]];