在ios中，要保存普通的数组到文件可以直接调用-wirteToFile:atomically:方法写入，并且可以通过NSArray的方法-initWithContentOfFile:来读文件初始化数组。然而，当要保存的数组中存储的数据对象是自定义对象时，就得通过对象归档的方法来实现了，具体来说

一、自定义对象实现归档协议，并实现方法- (id)initWithCoder:和方法- (void)encodeWithCoder:

@interface CourseModel : CYZBaseModel <NSCoding>

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super init];
    if (self) {
        self.courseName = [aDecoder decodeObjectForKey:@"courseName"];
        self.courseTeacher = [aDecoder decodeObjectForKey:@"courseTeacher"];
        self.courseTime = [aDecoder decodeObjectForKey:@"courseTime"];
        self.courseLocation = [aDecoder decodeObjectForKey:@"courseLocation"];
        self.shouldUseTip = [aDecoder decodeBoolForKey:@"shouldUseTip"];
        self.row = [aDecoder decodeIntegerForKey:@"row"];
        self.section = [aDecoder decodeIntegerForKey:@"section"];
    }
    return self;
}

- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.courseName forKey:@"courseName"];
    [aCoder encodeObject:self.courseTeacher forKey:@"courseTeacher"];
    [aCoder encodeObject:self.courseTime forKey:@"courseTime"];
    [aCoder encodeObject:self.courseLocation forKey:@"courseLocation"];
    [aCoder encodeBool:self.shouldUseTip forKey:@"shouldUseTip"];
    [aCoder encodeInteger:self.row forKey:@"row"];
    [aCoder encodeInteger:self.section forKey:@"section"];
}

二、获得保存文件的路径

- (NSString *)filePath
{
    return [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"course.plist"];
}

    NSString *path = [self filePath];
    [NSKeyedArchiver archiveRootObject:self.allCourses toFile:path];
    

四、调用NSKeyedUnarchiver类的类方法:- (id)unarchiveObjectWithFile:读文件

    NSString *path = [self filePath];
    self.allCourses = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
    if (self.allCourses == nil) {
        self.allCourses = [NSMutableArray array];
    }

iOS开发——保存自定义对象数组、字典到文件