iOS開發——儲存自訂對象數組、字典到檔案

iOS開發——儲存自訂對象數組、字典到檔案

在ios中，要儲存普通的數組到檔案可以直接調用-wirteToFile:atomically:方法寫入，並且可以通過NSArray的方法-initWithContentOfFile:來讀檔案初始化數組。然而，當要儲存的數組中儲存的資料對象是自訂對象時，就得通過對象歸檔的方法來實現了，具體來說

一、自訂對象實現歸檔協議，並實現方法- (id)initWithCoder:和方法- (void)encodeWithCoder:

@interface CourseModel : CYZBaseModel 

- (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、獲得儲存檔案的路徑

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

三、調用NSKeyedArchived類的類方法：- (void)archiveRootObject:toFile:寫入檔案

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

四、調用NSKeyedUnarchiver類的類方法:- (id)unarchiveObjectWithFile:讀檔案

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