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:1];
====== 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: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];
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);
[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
原文：http://www.cnblogs.com/missajj/p/4587199.html