利用pre平台实现iOS应用程序自动更新

 //
 //  AppDelegate.m
 //  PreAutoUpdateDemo
 //
 //  Created by mac on 15/12/18.
 //  Copyright © 2015年 mac. All rights reserved.
 //

 #import "AppDelegate.h"

 #define USER_KEY @"1234321344SDFDFBVVFGDSVF" // 根据实际情况替换为自己的user_key

 @interface AppDelegate () <UIAlertViewDelegate>

 /** pre app_key */
 @property(nonatomic,copy)NSString *app_key;
 /** package_key */
 @property(nonatomic,copy)NSString *package_key;
 /** last_version */
 @property(nonatomic,copy)NSString *last_version;
 /** isNewVirson 是否有新版本需要更新 */
 @property(nonatomic,assign)BOOL isNewVersion;
 @end

 @implementation AppDelegate
 /*
  实现程序启动就能动态检测是否有更新需要在application:(UIApplication *)application didFinishLaunchingWithOptions:方法里
  1.首先调用viewUploadApps方法获取app_key
  2.然后调用getAllVersions方法获取package_key
  3.再调用getAppDetailInfo获取last_version
  4.最后调用compareVersions方法比较版本号
  5.如果版本号不同那么就调用updateApp方法更新喽

 备注：不懂加QQ：1838886973
  */

 # pragma mark - pre自动更新
 // 获取app_key
 - (void)viewUploadApps
 {
     // POST-http://pre.im/api/v1/app/myapps
     NSURLSession *session = [NSURLSession sharedSession];
     NSURL *url = [NSURL URLWithString:@"http://pre.im/api/v1/app/myapps"];
     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
     request.HTTPMethod = @"POST";
     request.HTTPBody = [@"user_key=cedf0edc71e463628af1ee9c4b3bb84b" dataUsingEncoding:NSUTF8StringEncoding];

     NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
         if (!data) {
             return;
         }
         NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
         self.app_key = [dict[@"data"][@"list"] firstObject][@"app_key"];

         dispatch_async(dispatch_get_main_queue(), ^{

             [self getAllVersions];

         });
     }];

     [task resume];
 }
 // 获取package_key
 - (void)getAllVersions
 {
     // POST-http://pre.im/api/v1/app/builds
     NSURLSession *session = [NSURLSession sharedSession];
     NSURL *url = [NSURL URLWithString:@"http://pre.im/api/v1/app/builds"];
     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
     request.HTTPMethod = @"POST";
     NSString *parms = [NSString stringWithFormat:@"user_key=%@&app_key=%@&page=%d",USER_KEY,self.app_key,];
     request.HTTPBody = [parms dataUsingEncoding:NSUTF8StringEncoding];

     NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
         if (!data) {
             return;
         }

         NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
         self.package_key = [dict[@"data"][@"list"] firstObject][@"package_key"];

         dispatch_async(dispatch_get_main_queue(), ^{

             [self getAppDetailInfo];

         });

     }];

     [task resume];
 }
 // 获取last_version
 - (void)getAppDetailInfo
 {
     // POST-http://pre.im/api/v1/app/view
     NSURLSession *session = [NSURLSession sharedSession];
     NSURL *url = [NSURL URLWithString:@"http://pre.im/api/v1/app/view"];

     NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
     request.HTTPMethod = @"POST";

     NSString *parms = [NSString stringWithFormat:@"user_key=%@&app_key=%@&package_key=%@",USER_KEY,self.app_key,self.package_key];

     request.HTTPBody = [parms dataUsingEncoding:NSUTF8StringEncoding];

     NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
         if (!data) {
             return;
         }

         NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
         self.last_version = dict[@"data"][@"last_version"];

         dispatch_async(dispatch_get_main_queue(), ^{

             [self compareVersions];

         });
     }];
     [task resume];

 }
 // 比较版本号
 - (void)compareVersions
 {
     NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
     // app当前版本
     NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];

     if (app_Version.floatValue < self.last_version.floatValue) { // 注意了，这里只能比较2.1、2.2这种版本号，不能比较2.1.1这种三段式版本。如果想比较三段式版本，可以把if的判断条件改为比较字符串是否相同
         self.isNewVersion = YES;
         // 更新
         dispatch_async(dispatch_get_main_queue(), ^{
             UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"App更新" message:@"有最新版本更新哦~" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"更新", nil];
             [alertView show];
         });
     } else {
         self.isNewVersion = NO;
     }
 }
 //更新APP
 - (void)updateApp
 {
     // GET-http://pre.im/api/v1/app/install
     NSURLSession *session = [NSURLSession sharedSession];
     NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://pre.im/api/v1/app/install?app_key=%@",self.app_key]];

     NSURLSessionDataTask *task = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
         if (!data) {
             return;
         }
         NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
         NSString *urlStr = dict[@"data"];
         NSURL *url = [NSURL URLWithString:urlStr];

         BOOL isOpen = [[UIApplication sharedApplication] openURL:url];
         NSLog(@"isOpen = %d url = %@",isOpen,dict[@"data"]);

     }];
     [task resume];
 }

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

     //pre更新
     [self viewUploadApps];
     return YES;
 }

 #pragma mark - UIAlertViewDelegate
 - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
 {
     if (buttonIndex ==  && self.isNewVersion) { // 点击了确定就更新
         [self updateApp];
     }
 }
 @end