iOS 检测更新版本

获取app版本URL 数字是appID，在开发者账号app信息中可以找到

#define APP_URL @"http://itunes.apple.com/cn/lookup?id=1169362912"

检测商店的版本

//检测商店的版本
    AFHTTPSessionManager *mgr = [AFHTTPSessionManager manager];
    [mgr POST:APP_URL parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        NSLog(@"------------------------------------------------------------------------%@",responseObject);
        /*responseObject是个字典{}，有两个key

         KEYresultCount = 1//表示搜到一个符合你要求的APP
         results =（）//这是个只有一个元素的数组，里面都是app信息，那一个元素就是一个字典。里面有各种key。其中有 trackName （名称）trackViewUrl = （下载地址）version （可显示的版本号）等等
         */

        //具体实现为
        NSArray *arr = [responseObject objectForKey:@"results"];
        NSDictionary *dic = [arr firstObject];
        NSString *versionStr = [dic objectForKey:@"version"];
        NSString *trackViewUrl = [dic objectForKey:@"trackViewUrl"];
        NSString *releaseNotes = [dic objectForKey:@"releaseNotes"];//更新日志

        //NSString* buile = [[NSBundle mainBundle] objectForInfoDictionaryKey: (NSString*) kCFBundleVersionKey];build号

        // 加测当前的版本
        NSString *app_Version = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
        NSLog(@"------------------------------------------------------------------------%@",app_Version);
        if ([self compareVersionsFormAppStore:versionStr WithAppVersion:app_Version]) {
            UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:[NSString stringWithFormat:@"发现新版本:%@",versionStr] message:releaseNotes preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *cancelAction  = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
                NSLog(@"点击了取消");
            }];

            UIAlertAction *OKAction  = [UIAlertAction actionWithTitle:@"更新" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                NSLog(@"点击了知道了");
                NSURL * url = [NSURL URLWithString:trackViewUrl];//itunesURL = trackViewUrl的内容
                [[UIApplication sharedApplication] openURL:url];
            }];
            [alertVC addAction:cancelAction];
            [alertVC addAction:OKAction];
            [self presentViewController:alertVC animated:YES completion:nil];
        }

    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"");

    }];

比较方法

//比较版本的方法，在这里我用的是Version来比较的
- (BOOL)compareVersionsFormAppStore:(NSString*)AppStoreVersion WithAppVersion:(NSString*)AppVersion {

    BOOL littleSunResult = false;

    NSMutableArray* a = (NSMutableArray*) [AppStoreVersion componentsSeparatedByString: @"."];
    NSMutableArray* b = (NSMutableArray*) [AppVersion componentsSeparatedByString: @"."];

    while (a.count < b.count) { [a addObject: @"0"]; }
    while (b.count < a.count) { [b addObject: @"0"]; }

    for (int j = 0; j<a.count; j++) {
        if ([[a objectAtIndex:j] integerValue] > [[b objectAtIndex:j] integerValue]) {
            littleSunResult = true;
            break;
        }else if([[a objectAtIndex:j] integerValue] < [[b objectAtIndex:j] integerValue]){
            littleSunResult = false;
            break;
        }else{
            littleSunResult = false;
        }
    }
    return littleSunResult;//true就是有新版本，false就是没有新版本

}