退出应用数据的保存和恢复

ゝ一纸荒年。 2022-08-02 00:26 193阅读 0赞

应用 application 中保存和恢复数据  ，重写下面方法

- (BOOL) application:(UIApplication *)application shouldSaveApplicationState:(NSCoder *)coder{
    
        NSLog(@"shouldSaveApplicationState");
        return YES;
    }
    
    
    - (BOOL) application:(UIApplication *)application shouldRestoreApplicationState:(NSCoder *)coder{
    
         NSLog(@"shouldRestoreApplicationState");
        return YES;
    }
    
    - (void)application:(UIApplication *)application willEncodeRestorableStateWithCoder:(NSCoder *)coder{
       
        [coder encodeObject:@"appliaction_data" forKey:@"app_key"];
    
    }
    
    - (void)application:(UIApplication *)application didDecodeRestorableStateWithCoder:(NSCoder *)coder{
    
        NSString *str = [coder decodeObjectForKey:@"app_key"];
        
        NSLog(@"app--data--%@",str);
    }

UIviewController  保存和恢复 ， 实现

UIViewControllerRestoration 协议

//
    //  ViewController.m
    //  书籍_退出应用数据的保存和恢复
    //
    //  Created by 麦子 on 15/7/3.
    //  Copyright (c) 2015年 麦子. All rights reserved.
    //
    
    #import "ViewController.h"
    #define MY_KEY  @"myKey"
    
    @interface ViewController ()
    
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        NSLog(@"view did load");
        self.view.backgroundColor = [UIColor yellowColor];
        self.restorationIdentifier = @"AnyIdentifier";
        self.restorationClass = [self class];
    }
    
    
    + (UIViewController *) viewControllerWithRestorationIdentifierPath:(NSArray *)identifierComponents coder:(NSCoder *)coder{
        
        // 获取父类对象
        if ([[self alloc] isKindOfClass:[UIViewController class]]) {
            NSLog(@"UIViewController=====");
        }
        UIViewController *viewContro = [[self alloc] initWithNibName:nil bundle:nil];
        return  viewContro;
    }
    
    // 保存数据
    - (void)encodeRestorableStateWithCoder:(NSCoder *)coderA{
        [super encodeRestorableStateWithCoder:coderA];
        
        [coderA encodeObject:@"myData" forKey:MY_KEY];
        
        NSLog(@"保存数据");
    }
    
    // 恢复数据
    - (void)decodeRestorableStateWithCoder:(NSCoder *)coderA{
        [super decodeRestorableStateWithCoder:coderA];
        NSString *data = [coderA decodeObjectForKey:MY_KEY];
        NSLog(@"恢复数据---%@",data);
    }
    
    
    
    
    - (void)didReceiveMemoryWarning {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    @end

恢复数据如下：

**2015-07-03 17:55:06.528** **书籍****\_****退出应用数据的保存和恢复****\[1835:123914\] shouldRestoreApplicationState**

**2015-07-03 17:55:06.529** **书籍****\_****退出应用数据的保存和恢复****\[1835:123914\] UIViewController=====**

**2015-07-03 17:55:06.530** **书籍****\_****退出应用数据的保存和恢复****\[1835:123914\] view did load**

**2015-07-03 17:55:06.530** **书籍****\_****退出应用数据的保存和恢复****\[1835:123914\]** **恢复数据****---myData**

**2015-07-03 17:55:06.530** **书籍****\_****退出应用数据的保存和恢复****\[1835:123914\] app--data--appliaction\_data**

**2015-07-03 17:55:06.532** **书籍****\_****退出应用数据的保存和恢复****\[1835:123914\] view did load**