1.归档方式
把记录保存在应用沙盒的某一文件中，进行归档，或者说存档。
新建一个类CJSearchRecord，继承NSObject,并遵守NSCoding协议
CJSearchRecord.h文件
@interface CJSearchRecord : NSObject<NSCoding>
@property (nonatomic, copy) NSString *beginCity;
@property (nonatomic, copy) NSString *endCity;
CJSearchRecord.m文件实现两个方法
//归档、存入档案
-(void)encodeWithCoder:(nonnull NSCoder *)encoder{
[encoder encodeObject:_beginCity forKey:@"beginCity"];
[encoder encodeObject:_endCity forKey:@"endCity"];
}
//解档，打开档案
-(nullable instancetype)initWithCoder:(nonnull NSCoder *)decoder{
if (self=[super init]) {
_beginCity = [decoder decodeObjectForKey:@"beginCity"];
_endCity =[decoder decodeObjectForKey:@"endCity"];
}
return self;
}
在ViewController.m文件中导入上面创建的文件
在某一个按钮事件方法中
//归档，保存搜索记录
CJSearchRecord *record = [[CJSearchRecord alloc]init];
//设置值
record.beginCity = self.beginCity.titleLabel.text;
record.endCity = self.endCity.titleLabel.text;
//获取沙盒中的document目录
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
//拼接文件路径
NSString *filePath = [path stringByAppendingPathComponent:@"searchRecoder.plist"];
//进行归档
[NSKeyedArchiver archiveRootObject:record toFile:filePath];
在viewDidLoad方法中
//解档,读档，读取记录
//获取文件路径
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
NSString *filePath = [path stringByAppendingPathComponent:@"searchRecoder.plist"];
CJSearchRecord *record = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
