[MISS静IOS开发原创文摘]-AppDelegate存储全局变量和 NSUserDefaults standardUserDefaults 通过模型保存和读取数据,存储自定义的对象

2021-10-01 10:51:44

由于app开发的需求,需要从api接口获得json格式数据并保存临时的 app的主题颜色和相关url

方案有很多种:

1, 通过AppDelegate保存为全局变量,再获取

2,使用NSUSerDefault

第一种 :通过AppDelegate方法:

定义全局变量

//

//  AppDelegate.h

//

//  Created by MISSAJJ on 15/5/5.

//  Copyright (c) 2015年 MISSAJJ. All rights reserved.

//

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate >

@property (strong, nonatomic) UIWindow *window;

@property (strong, nonatomic) NSString *globalAppThemeColor;

@property (strong, nonatomic) NSString *globalAboutTag;

@end

在AppDelegate.m 内赋值:

_globalAppThemeColor = appDetails.appThemeColor;

_globalAboutTag = appDetails.about;

在需要的VC头部导入

#import "AppDelegate.h"

- (void)viewDidLoad {

    [super viewDidLoad];

   //创建

  AppDelegate * appDelegate=(AppDelegate*)[[UIApplication sharedApplication]delegate];

}

获得变量

NSString *about = appDelegate.globalAboutTag;
NSString *theme = appDelegate.globalAppThemeColor;

灵活运用到代码需求的地方

//navi设置为全局主题色

self.navigationController.navigationBar.barTintColor = [UIColor colorWithHexString:appDelegate.globalAppThemeColor alpha:];

====== I am 华丽丽的分割线 ^_^=======

第二种 :通过NSUserDefaults方法:

查找了相关资料,自己整理了一份NSUserDefaults文摘给有共同有需求的程序猿朋友们.

一 ,NSUserDefaults 简单的运用方法

NSUserDefaults一般可以存取一些短小的信息，比如存入再读出一个字符串到NSUserDefaults

注意 : key值必须要相同才能读取出来哦!

NSUserDefaults只支持： NSString, NSNumber, NSDate, NSArray, NSDictionary, 不是所有数据都能往里放滴哦~

//存储数据

NSString *string = [NSString stringWithString @"我想存储的字符串内容"];

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

[userDefaults setObject:string forKey:@"theme"]; 
//在存储数据的地方,别忘了这一句

[[NSUserDefaults standardUserDefaults] synchronize];

//在需要的地方获取数据

NSString *getStringValue  = [[NSUserDefaults standardUserDefaults] objectForKey:@"theme"];

二 , 如果需要保存比较多得数据, 可以通过模型保存和读取

1.模型代码

//

//  AreasModel.h

////

//  Created by MISSAJJ on 15/5/7.

//  Copyright (c) 2015年 MISSAJJ. All rights reserved.

//

#import <Foundation/Foundation.h>

@interface AreasModel : NSObject

/*

 * about 模型

 */

@property (nonatomic,copy)NSString * about;

@property (nonatomic,copy)NSString * appThemeColor;

@end

记住必须要在 M 文件里写这两个方法

- (id) initWithCoder: (NSCoder *)coder

- (void) encodeWithCoder: (NSCoder *)coder

然后把该自定义的类对象编码到 NSData中，再从NSUserDefaults中进行读取。

//

//  AreasModel.m

////

//  Created by MISSAJJ on 15/5/7.

//  Copyright (c) 2015年 MISSAJJ. All rights reserved.

//

#import "AreasModel.h"

@implementation AreasModel

- (id)initWithCoder:(NSCoder *)aDecoder

{

    if(self = [super init])

    {

        self.about       = [aDecoder decodeObjectForKey:@"about"];

        self.appThemeColor           = [aDecoder decodeObjectForKey:@"appThemeColor"];

    }

    return self;

}

- (void)encodeWithCoder:(NSCoder *)aCoder

{

    [aCoder encodeObject:self.about forKey:@"about"];

    [aCoder encodeObject:self.appThemeColor forKey:@"appThemeColor"];

}

@end

2. 存储数据的代码

//////////////////////////   
   以上省略........
//////////////////////////

 //URL编码成UTF8

    dirPath = [dirPath stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSURL * dirUrl = [NSURL URLWithString:dirPath];

    NSMutableURLRequest * dirRequest = [NSMutableURLRequest requestWithURL:dirUrl];

    NSData *dirJsonData = [NSURLConnection sendSynchronousRequest:dirRequest returningResponse:nil error:nil];

    NSDictionary *dirListJsonData = [NSJSONSerialization JSONObjectWithData:dirJsonData options: error:nil];

    NSDictionary* dicData = [dirListJsonData objectForKey:@"data"];

   #pragma mark ====保存临时主题和关于信息====

    NSString *about = [dicData objectForKey:@"about"];

    NSString *theme = [dicData objectForKey:@"theme"];

    //创建模型

    AreasModel *themeAndAbout = [[AreasModel alloc] init];

    themeAndAbout.about = about;

    themeAndAbout.appThemeColor = theme;

    //保存数据,用归档保存到NSUserDefault

    NSData *themeAndAboutData = [NSKeyedArchiver archivedDataWithRootObject:themeAndAbout];

    [[NSUserDefaults standardUserDefaults] setObject:themeAndAboutData forKey:@"themeAndAbout"];

    [[NSUserDefaults standardUserDefaults] synchronize];

3. 获取数据代码

//获得保存数据

    NSData *getthemeAndAboutData = [[NSUserDefaults standardUserDefaults] objectForKey:@"themeAndAbout"];

//转成模型获取数据

   AreasModel *getThemeAndAbout =   [NSKeyedUnarchiver unarchiveObjectWithData:getthemeAndAboutData];

    NSLog(@"%@,%@",getThemeAndAbout.appThemeColor, getThemeAndAbout.about);

====心灵和身体,总有一个在路上===

====只要还在路上,就不至于后退===

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