判断APP是否已安装

    NSString *str = [NSString stringWithFormat:@"%@://%@",[dic objectForKey:@"ios_url_scheme"],[dic objectForKey:@"app_bundle_id"]];
    NSURL *app_url = [NSURL URLWithString:str];
    BOOL hasInstalled = [[UIApplication sharedApplication] canOpenURL:app_url];
    if (hasInstalled){
        //说明此设备有安装app,打开APP
        if (APP_Version.doubleValue <= 10) {
            [[UIApplication sharedApplication] openURL:app_url];
        }else{
            [[UIApplication sharedApplication] openURL:app_url options:@{} completionHandler:nil];
        }
    }else{
        //说明此设备没有安装app,跳转APP_STORE
        NSString *link = [dic objectForKey:@"app_link_ios"];
        if (link.length != 0) {
            NSString *link_pro = [link stringByReplacingOccurrencesOfString:@"https" withString:@"itms-apps"];
            if (APP_Version.doubleValue <= 10) {
                [[UIApplication sharedApplication] openURL:[NSURL URLWithString:link_pro]];
            }else{
                [[UIApplication sharedApplication] openURL:[NSURL URLWithString:link_pro] options:@{} completionHandler:nil];
            }
        }
    }