Q:

Unable to run flutter project on IOS with firestore

I am unable to run flutter project on IOS simulator.  I have integrated Cloud Firestore for Firebase with the project.  The project is running perfectly on Android Device, but couldnt able to run it on IOS Simulator.  
I would be thankful if any one can help me out solve this issue. 
When I run pod install command I got the following error Please check. 

Muhammads-MacBook-Pro:ios bhatti$ pod install Analyzing dependencies [!]  CDN: trunk Repo update failed - 44 error(s): CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.2.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.2.1/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.3.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.3.1/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.4.2/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.4.3/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.4.4/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.5.1/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.6.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.7.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.8.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/3.9.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/4.0.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/4.0.1/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/4.0.2/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/4.0.3/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/4.0.4/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/4.0.5/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/4.0.9/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/4.1.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/4.2.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.0.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.0.1/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.1.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.1.1/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.1.2/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.1.4/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.2.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.3.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.4.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.5.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.6.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.7.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.8.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/5.8.1/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/6.0.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/6.0.1/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/6.0.2/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/6.0.3/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/6.0.4/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/6.1.0/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/6.1.1/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/6.1.2/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known) CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/e/2/1/FirebaseAnalytics/6.1.3/FirebaseAnalytics.podspec.json,
error: Failed to open TCP connection to raw.githubusercontent.com:443 (getaddrinfo: nodename nor servname provided, or not known)

Error

*** First throw call stack:
(
 0   CoreFoundation                      0x00007fff23baa1ee __exceptionPreprocess + 350
 1   libobjc.A.dylib                     0x00007fff50864b20 objc_exception_throw + 48
 2   CoreFoundation                      0x00007fff23baa02c +[NSException raise:format:] + 188
 3   Runner                              0x0000000103e82d7a +[FIRApp configure] + 138
 4   Runner                              0x0000000104397086 -[FLTCloudFirestorePlugin init] + 214
 5   Runner                              0x0000000104396f11 +[FLTCloudFirestorePlugin registerWithRegistrar:] + 289
 6   Runner                              0x0000000103e7e5c0 +[GeneratedPluginRegistrant registerWithRegistry:] + 112
 7   Runner                        <…>

Error connecting to the service protocol: HttpException: , uri = http://127.0.0.1:62281/vg54TtZ_CH0=/ws

AppDelegate 

#include "AppDelegate.h"
#include "GeneratedPluginRegistrant.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  [GeneratedPluginRegistrant registerWithRegistry:self];
  return [super application:application didFinishLaunchingWithOptions:launchOptions];
}

@end

A:

There can be many reasons.  kindly provide a screenshot of error or error message something more informative. 
I recently added cloud_firestore and It took days to solve dependencies issues for ios. 
Some common errors are:

Version Compatibility You need atleast XCode version 10.1 for firestore.  
Pod files are not installed. 
To solve this From terminal goto yourproject/ios
directory and run the following command

pod install

Make sure you performed this Step

If you can provide more information or steps you did I can guide you further.