本地保存数据(轻量级)
这里提供两种方案:
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
#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:1];
第二种 :通过NSUserDefaults方法:
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
- 模型代码
#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
- 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:0 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];
- 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);
```