IOS中打开应用实现检查更新的功能

//检查更新页面

- (void)Renew{
    
    NSDictionary *infoDic = [[NSBundle mainBundle]infoDictionary];
    
    NSString *version = [infoDic valueForKey:@"CFBundleShortVersionString"];
    
    NSString *ipstr = [NSObject  deviceIPAdress];
    
    NSString *paramIp = ipstr;
    
    NSTimeInterval time = [[NSDate  date]timeIntervalSince1970];
    
    long i = time;
    
    NSString *paramTime = [NSString stringWithFormat:@"%ld",i];
    
    NSString *signstr = [NSString  stringWithFormat:@"%@%@%@%@",paramTime,paramIp,@"phone_ios",@"d556bd3337cd909b49eb5e33f46ad65c"];
    
    NSString *md5str =  [signstr MD5Hash];
    
    NSString *mdstr = [md5str   lowercaseString];
    
    NSString *sign = mdstr;
    
    NSString *key = @"phone_ios";
    
    NSDictionary *param = @{
                            @"type" : @2,
                            
                            @"version" : version
                            
                            };
    
    NSDictionary *dict = @{
                           
                           @"paramTime" : paramTime,
                           
                           @"paramIp" : paramIp,
                           
                           @"sign":sign,
                           
                           @"key" : key,
                           
                           @"param":param
                           
                           };
    
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    
    manager.requestSerializer = [AFJSONRequestSerializer serializer];
    
    manager.responseSerializer =  [AFJSONResponseSerializer  serializer];
    
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"application/json"];
    
    [manager POST:RenewUrl parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {
        
        NSDictionary *resultDic = responseObject[@"result"];
        
        _upgradeUrl = resultDic[@"upgradeUrl"];
        
          _force = resultDic[@"isForce"];
        NSLog(@"_force--------%@",_force);
     
        NSLog(@"%@",resultDic);
        
        if ([resultDic[@"isForce"]compare:@0] !=NSOrderedSame) {
            
        UIAlertView *isForceView = [[UIAlertView alloc]initWithTitle:@"特别提示" message:@"发现新版本" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"下载", nil];
            
            
            [isForceView show];
            
        }else if ([resultDic[@"version"]compare:version] != NSOrderedSame) {
            
            UIAlertView *resultView = [[UIAlertView alloc]initWithTitle:@"提示" message:@"发现新版本" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"下载", nil];
            
            [resultView show];
            
        }else{
            
            return ;
        }
        
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        
        UIAlertView *errorView = [[UIAlertView alloc]initWithTitle:@"提示" message:@"网络有问题" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
        
        [errorView show];
        
        NSLog(@"%@",error);
    }];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    
    if ([_force compare:@1 ]!=NSOrderedSame) {
        
        if (buttonIndex==1) {
            
            [self  startDownLoad];
            
//            [[UIApplication  sharedApplication]openURL:[NSURL URLWithString:_upgradeUrl]];
        }
        
        }else if ([_force  compare:@0] !=NSOrderedSame){
        
        if ( buttonIndex == 1) {
            
//            [[UIApplication  sharedApplication]openURL:[NSURL URLWithString:_upgradeUrl]];
            
            [self  startDownLoad];
            
        }else if (buttonIndex == 0){
            
            exit(0);
            
        }
    }
    
}

- (void) startDownLoad{

NSURL *url = [NSURL URLWithString:_upgradeUrl];
    
//    NSLog(@"url-------%@",url);
    
    NSURLRequest *request = [NSURLRequest  requestWithURL:url];
    
    NSURLConnection *connect = [NSURLConnection  connectionWithRequest:request delegate:self];
    
    [connect  start];
}