iOS基础（六）——获取当前版本，比较更新版本

1、版本的比较

//处理版本
-(void)VersonUpdate{
    //定义的app的地址
    NSString *urld = [NSString stringWithFormat:@"http://itunes.apple.com/lookup?id=%@",@"你的id"];
    
    //网络请求app的信息，主要是取得我说需要的Version
    NSURL *url = [NSURL URLWithString:urld];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                           cachePolicy:NSURLRequestReloadIgnoringCacheData
                                                       timeoutInterval:10];
    [request setHTTPMethod:@"POST"];
    
    NSURLSession *session = [NSURLSession sharedSession];
    
    NSURLSessionDataTask *task = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        NSMutableDictionary *receiveStatusDic=[[NSMutableDictionary alloc]init];
        if (data) {
            
            //data是有关于App所有的信息
            NSDictionary *receiveDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
            if ([[receiveDic valueForKey:@"resultCount"] intValue]>0) {
                
                [receiveStatusDic setValue:@"1" forKey:@"status"];
                [receiveStatusDic setValue:[[[receiveDic valueForKey:@"results"] objectAtIndex:0] valueForKey:@"version"]   forKey:@"version"];
                
                //请求的有数据，进行版本比较
                [self performSelectorOnMainThread:@selector(receiveData:) withObject:receiveStatusDic waitUntilDone:NO];
            }else{
                
                [receiveStatusDic setValue:@"-1" forKey:@"status"];
            }
        }else{
            [receiveStatusDic setValue:@"-1" forKey:@"status"];
        }
    }];
    
    [task resume];
}

2、获取自身版本号

-(void)receiveData:(id)sender
{
    //获取APP自身版本号 localVersion 例如：0.2.1 -> 021
    NSString *localVersion = [[[NSBundle mainBundle]infoDictionary]objectForKey:@"CFBundleShortVersionString"];
    
    localVersion = [localVersion stringByReplacingOccurrencesOfString:@"." withString:@""];
    
    NSString * serverVerison = sender[@"version"];
    
    serverVerison = [serverVerison stringByReplacingOccurrencesOfString:@"." withString:@""];
    if ([serverVerison intValue]>[localVersion intValue]) {
        [self updateVersion];
    }
}

3、提示更新

-(void)updateVersion{
    NSString *msg = [NSString stringWithFormat:@"更新最新版本，优惠信息提前知"];
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"升级提示" message:msg preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *otherAction = [UIAlertAction actionWithTitle:@"现在升级"style:UIAlertActionStyleDestructive handler:^(UIAlertAction*action) {
        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://itunes.apple.com/cn/app/id1355602256?mt=8"]];
        [[UIApplication sharedApplication]openURL:url];
    }];
    [alertController addAction:otherAction];
    [self.window.rootViewController presentViewController:alertController animated:YES completion:nil];//@"1355602256"
}

此方法是要上架后才可以用！

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