检测版本更新的方法。

 

//检查新版本 更新        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{        // 耗时的操作                //获取本地版本号        NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];        NSString *version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];        NSString *build = [infoDictionary objectForKey:@"CFBundleVersion"];        NSString *nowVersion = [NSString stringWithFormat:@"%@.%@", version, build];                //获取appStore网络版本号        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://itunes.apple.com/lookup?id=%@", @"1081299934"]];        NSString * file =  [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];                NSRange substr = [file rangeOfString:@"\"version\":\""];        NSRange range1 = NSMakeRange(substr.location+substr.length,10);        //    NSRange substr2 =[file rangeOfString:@"\"" options:nil range:range1];        NSRange substr2 = [file rangeOfString:@"\"" options:NSCaseInsensitiveSearch  range:range1];        NSRange range2 = NSMakeRange(substr.location+substr.length, substr2.location-substr.location-substr.length);        NSString *appStoreVersion =[file substringWithRange:range2];                dispatch_async(dispatch_get_main_queue(), ^{            // 更新界面                        //如果不一样去更新            if(![nowVersion isEqualToString:appStoreVersion])            {                                [self showAlert];                            }                                });    });/** *  检查新版本更新 */-(void)showAlert{    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"有新的版本啦~~" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"前去更新",nil];    [alert show];}- (void)alertView:(UIAlertView*)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    if(buttonIndex==1)    {        // 此处加入应用在app store的地址，方便用户去更新，一种实现方式如下：        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://itunes.apple.com/us/app/id%@?ls=1&mt=8", @"10812999054"]];        [[UIApplication sharedApplication] openURL:url];    }}