通常app页面需要使用本地化存储来减少用户每次进入请求的等待时间。常用的本地存储方法如NSKeyedArchiver和NSUserDefaults等。但是一般情况下，这些本地存储的类型要求不支持自定义的类型，只支持NSString NSarray NSDictornary等类型。这样可以通过<NSCopying>协议来编码对象和解码对象操作。
创建model遵循<NSCopying>协议
#import <Foundation/Foundation.h>
@interface Model : NSObject<NSCoding
@property (nonatomic, copy) NSString *userName;
@property (nonatomic, copy) NSString *passWord;
@property (nonatomic, copy) NSString *phoneNum;
@end;
#import "Model.h"
@implementation Model
- (void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:self.userName forKey:@"userName"];
[aCoder encodeObject:self.passWord forKey:@"passWord"];
[aCoder encodeObject:self.phoneNum forKey:@"phoneNum"];
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
if (self = [super init]) {
self.name = [aDecoder decodeObjectForKey:@"userName"];
self.Class = [aDecoder decodeObjectForKey:@"passWord"];
self.Class = [aDecoder decodeObjectForKey:@"phoneNum"];
}
return self;
}
@end
存储方法
//获取路径
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"modelTest.plist"];
NSFileManager *fileM = [NSFileManager defaultManager];
//判断文件是否存在，不存在则直接创建，存在则直接取出文件中的内容
if (![fileM fileExistsAtPath:filePath]) {
[fileM createFileAtPath:filePath contents:nil attributes:nil];
}
//要保存的自定义模型
Model *model= [[Model alloc] init];
model.name = @"police";
model.userName = @"policeman";
model.phoneNum = @"110";
//添加数组
[self.dataArr addObject:model];
//通常情况下的存储方法
[self.dataArr writeToFile:filePath atomically:YES];
//取数据方法
NSMutableArray *array = [NSMutableArray arrayWithContentsOfFile:filePath];
//保存自定义模型存储方法
[NSKeyedArchiver archiveRootObject:self.dataArr toFile:filePath];
//取数据方法
NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
