iOS 應用版本檢測更新

-(void)checkVersion:(id)sender{
   
    dict_version=[[sender objectFromJSONData] copy];
   
    //獲取用戶安裝當前客戶端的版本號
    NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
    //版本號存入數組
    NSString *now_version = [infoDictionary objectForKey:@"CFBundleVersion"];
    //版本號存入數組
    NSArray *local_version_arr=[now_version componentsSeparatedByString:@"."];
    ////NSLog(@"local_version_arr is %@",local_version_arr);
   
    //從服務器獲取的版本號
    NSString *new_version = [dict_version objectForKey:@"version"];
    //從服務器獲取的更新內容
    NSString *updateContern = [dict_version objectForKey:@"update_content"];
   
    //判斷獲取的內容是不是正確
    if (![new_version isEqual:[NSNull null]] && ![new_version isEqual:@""]) {
        //將版本號以“.”爲間隔存入數組中
        NSArray *new_version_arr=[new_version componentsSeparatedByString:@"."];
        //比較服務器版本號和當前應用版本號
        for (int i=0; i<[new_version_arr count];i++ ) {
            if ([[new_version_arr objectAtIndex:i] intValue]>[[local_version_arr objectAtIndex:i] intValue]) {
                UIAlertView *updateAlert=[[UIAlertView alloc]initWithTitle:@"版本更新提示" message:updateContern delegate:self cancelButtonTitle:@"稍後提示" otherButtonTitles:@"現在更新", nil];
                [updateAlert show];
                [updateAlert release];
                break;
            }else if ([[new_version_arr objectAtIndex:i] intValue]==[[local_version_arr objectAtIndex:i] intValue]) {
                continue;
            }else {
                return;
            }

        }

    }
}
#pragma mark - uialert delegate
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
   
    if (buttonIndex ==1) {
        NSLog(@"downloadUrl is %@",[dict_version objectForKey:@"downloadUrl"]);

       [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[dict_version objectForKey:@"downloadUrl"]]];

                //[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"itms-services://?action=download-manifest&url=https://xxx.plist"]];

    }

}