iOS子线程操作检测版本更新，防止阻塞住线程

来源：互联网发布：linux cat 全部编辑：程序博客网时间：2024/06/05 03:16

在做 app 版本更新时发现请求特别慢，有时甚至等10多秒，严重阻塞主线程，这严重影响了用户体验；

下面介绍一种方法在子线程执行app 版本更新代码；

NSString const *iTnuesApi = @"http://itunes.apple.com/lookup"; ／／itunes 的链接

／／获取本地的版本号

+ (NSString *)check_LocalApp_Version;
{
    NSString *localVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"];

    return localVersion;
}

//执行更新

+ (void )check_APP_UPDATE_WITH_APPID:(NSString *)appid ／／传入 app 在appstore 的 id
{
__block id JSON = nil;

／／创建全局线程

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSError *dataError = nil;

NSString *appURLAPI = [NSString stringWithFormat:@"%@?id=%@",iTnuesApi,appid];

／／请求更新数据（这个环节是最耗费时间的环节）

        NSData *appData = [NSData dataWithContentsOfURL:[NSURL URLWithString:appURLAPI] options:0 error:&dataError];
        if (dataError) {
            //NSLog(@"appStore app版本信息请求错误！请重新尝试");
            [self showAlertWithMessage:@"appStore app版本信息请求错误！请重新尝试"];
            return ;
        }

／／转换 json 格式

        JSON = [NSJSONSerialization JSONObjectWithData:appData options:0 error:nil];
        //NSLog(@"ddd : %@",JSON);

／／获取appstore 上的app 的版本号

       if ([[JSON objectForKey:@"resultCount"] intValue] > 0) {
            NSString *remoteVersion = [[[JSON objectForKey:@"results"] objectAtIndex:0] objectForKey:@"version"];
            NSString *releaseNotes = [[[JSON objectForKey:@"results"] objectAtIndex:0] objectForKey:@"releaseNotes"];
            NSString *trackURL = [[[JSON objectForKey:@"results"] objectAtIndex:0] objectForKey:@"trackViewUrl"];
            [[NSUserDefaults standardUserDefaults] setObject:trackURL forKey:@"KK_THE_APP_UPDATE_URL"];
            //NSLog(@"%@ %@ %@",remoteVersion,releaseNotes,trackURL);

            NSString *localVersion = [self check_LocalApp_Version];

／／判断 appstore 的版本是否比本地app 的版本高？如果高就提示更新

           if ([remoteVersion floatValue] > [localVersion floatValue]) {
                [[CheckVersion check] newVersionUpdate:remoteVersion notes:releaseNotes];
            }
            else
            {
                return;
            }

        }
        else
        {
            //NSLog(@"appStore 无app信息，请检查您的 app id");
            [self showAlertWithMessage:@"appStore 无此app信息，请检查您的 app id"];
            return ;
        }


    });

}

+ (void)showAlertWithMessage:(NSString *)messages
{

／／返回住线程执行版本更新提示

   dispatch_async(dispatch_get_main_queue(), ^{
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"版本更新提示" message:messages delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
        [alert show];

#if !__has_feature(objc_arc)
        [alert release];
#endif
    });

}
／／返回住线程执行版本更新提示
- (void)newVersionUpdate:(NSString *)version notes:(NSString *)releaseNotes
{
    dispatch_async(dispatch_get_main_queue(), ^{
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:[NSString stringWithFormat:@"新版本 %@",version] message:releaseNotes delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"更新", nil];
        [alert show];

#if !__has_feature(objc_arc)
        [alert release];
#endif
    });
}
／／返回住线程执行执行更新
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (buttonIndex==1) {
        //NSString *apiUrl = @"https://itunes.apple.com/us/app/wei-bo/id350962117?mt=8&uo=4";
        //apiUrl = @"itms-apps://itunes.apple.com/cn/app/wei-bo/id350962117?mt=8";
        NSString *theAppURL = [[NSUserDefaults standardUserDefaults] objectForKey:@"KK_THE_APP_UPDATE_URL"];
        NSURL *appStoreURL = [NSURL URLWithString:theAppURL];
        [[UIApplication sharedApplication] openURL:appStoreURL];
    }
}

本篇文章参考于 http://www.cnblogs.com/cocoajin/p/3527979.html

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