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,1];
    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 == 1 && self.isNewVersion) { // 点击了确定就更新
        [self updateApp];
    }
}
@end