#import@interface MJStudent : NSObject @property (nonatomic, copy) NSString *no; @property (nonatomic, assign) double height; @property (nonatomic, assign) int age; @end
#import "MJStudent.h" @interface MJStudent() @end @implementation MJStudent /** * 将某个对象写入文件时会调用 * 在这个方法中说清楚哪些属性需要存储 */ - (void)encodeWithCoder:(NSCoder *)encoder { [encoder encodeObject:self.no forKey:@"no"]; [encoder encodeInt:self.age forKey:@"age"]; [encoder encodeDouble:self.height forKey:@"height"]; } /** * 从文件中解析对象时会调用 * 在这个方法中说清楚哪些属性需要存储 */ - (id)initWithCoder:(NSCoder *)decoder { if (self = [super init]) { // 读取文件的内容 self.no = [decoder decodeObjectForKey:@"no"]; self.age = [decoder decodeIntForKey:@"age"]; self.height = [decoder decodeDoubleForKey:@"height"]; } return self; } @end - (IBAction)save { // 1.新的模型对象 MJStudent *stu = [[MJStudent alloc] init]; stu.no = @"42343254"; stu.age = 20; stu.height = 1.55; // 2.归档模型对象 // 2.1.获得Documents的全路径 NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; // 2.2.获得文件的全路径 NSString *path = [doc stringByAppendingPathComponent:@"stu.data"]; // 2.3.将对象归档 [NSKeyedArchiver archiveRootObject:stu toFile:path]; } - (IBAction)read { // 1.获得Documents的全路径 NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; // 2.获得文件的全路径 NSString *path = [doc stringByAppendingPathComponent:@"stu.data"]; // 3.从文件中读取MJStudent对象 MJStudent *stu = [NSKeyedUnarchiver unarchiveObjectWithFile:path]; NSLog(@"%@ %d %f", stu.no, stu.age, stu.height); }