iOS开发之一句代码检测APP版本的更新

• 提示更新效果图如下，当然也是可以自定义类似与AlertView相似的自定义view，如京东、网易云音乐都是自定义了这种提示框的view。以下只展示，从App Store获取到app信息、并解析app信息获取发布在App Store上的版本号与当前手机里安装的app版本号做对比，如果有更新就做提示。
• 在工程中新建一个NSObject类，将以下.h和.m文件中的代码拷贝至这个新建的类中。

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// //  HKCheckAppVersionMgr.h //  HKTyy // //  Created by isHakan on 17/3/24. //  Copyright © 2017年 liuhuakun. All rights reserved. //   #import <Foundation/Foundation.h>   @interface HKCheckAppVersionMgr : NSObject   + (HKCheckAppVersionMgr *)sharedInstance; - (void)isUpdataApp:(NSString *)appId;   @end

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// //  HKCheckAppVersionMgr.m //  HKTyy // //  Created by isHakan on 17/3/24. //  Copyright © 2017年 liuhuakun. All rights reserved. //   #import "HKCheckAppVersionMgr.h"   #import <UIKit/UIKit.h>   @interface HKCheckAppVersionMgr ()<UIAlertViewDelegate>   @property (nonatomic, strong) NSString *appId;   @end   @implementation HKCheckAppVersionMgr   + (HKCheckAppVersionMgr *)sharedInstance {     static HKCheckAppVersionMgr *instance = nil;           static dispatch_once_t onceToken;     dispatch_once(&onceToken, ^{                   instance = [[HKCheckAppVersionMgr alloc] init];               });           return instance; }   - (void)isUpdataApp:(NSString *)appId {     NSURL *appUrl = [NSURL URLWithString:[NSString stringWithFormat:@"http://itunes.apple.com/lookup?id=%@",appId]];     NSString *appMsg = [NSString stringWithContentsOfURL:appUrl encoding:NSUTF8StringEncoding error:nil];     NSDictionary *appMsgDict = [self jsonStringToDictionary:appMsg];     NSDictionary *appResultsDict = [appMsgDict[@"results"] lastObject];     NSString *appStoreVersion = appResultsDict[@"version"];     float newVersionFloat = [appStoreVersion floatValue];//新发布的版本号           NSString *currentVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];     float currentVersionFloat = [currentVersion floatValue];//使用中的版本号           //当前版本小于App Store上的版本&用户未点击不再提示     if (currentVersionFloat<newVersionFloat && ![self isAlertUpdataAgain])     {         self.appId = appId;         UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"检测到新版本，是否去更新？" delegate:self cancelButtonTitle:@"去更新" otherButtonTitles:@"下次再说",@"不再提示", nil];         [alertView show];     }       }   - (NSDictionary *)jsonStringToDictionary:(NSString *)jsonStr {     if (jsonStr == nil)     {         return nil;     }           NSData *jsonData = [jsonStr dataUsingEncoding:NSUTF8StringEncoding];     NSError *error;     NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:jsonData                                                          options:NSJSONReadingMutableContainers                                                            error:&error];     if (error)     {         //NSLog(@"json格式string解析失败:%@",error);         return nil;     }           return dict; }     #pragma mark UIAlertViewDelegate - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {     if (buttonIndex==0)     {         [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://itunes.apple.com/app/id%@",self.appId]]];         return;     }           if (buttonIndex==2)     {         [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"IS_ALERT_AGAIN"];         [[NSUserDefaults standardUserDefaults] synchronize];         return;     } }   - (BOOL)isAlertUpdataAgain {     BOOL res = [[NSUserDefaults standardUserDefaults] objectForKey:@"IS_ALERT_AGAIN"];     return res; }   @end

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• 在需要检测App版本是否有更新的地方-[以下是以在ViewController处检测App版本更新为例]：

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//  ViewController.m //  Demo // //  Created by isHakan on 2017/7/21. //  Copyright © 2017年 liuhuakun. All rights reserved. //   #import "ViewController.h"   //引入‘头文件’ #import "HKCheckAppVersionMgr.h"   //发布在App Store的Apple ID #define kYourAppleID @"1234567890"   @interface ViewController ()   @end   @implementation ViewController   - (void)viewDidLoad {     [super viewDidLoad];     // Do any additional setup after loading the view, typically from a nib.           //一句代码检测更新     [[HKCheckAppVersionMgr sharedInstance] isUpdataApp:kYourAppleID]; }   - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning];     // Dispose of any resources that can be recreated. }     @end