Debug
(lldb) po descFirstHeight.priority
▿ UILayoutPriority
- rawValue : 1000.0

(lldb) po descSecondHeight.priority
▿ UILayoutPriority
- rawValue : 500.0

(lldb) po UILayoutPriority.defaultLow
▿ UILayoutPriority
- rawValue : 250.0

(lldb) po UILayoutPriority.defaultHigh
▿ UILayoutPriority
- rawValue : 750.0

(lldb)

Solution
- In XIB dont set (priority = 1000) but you must set (prority = 999)
descFirstHeight =  999
descSecondHeight = 250

- And in file swift 

descFirstHeight.priority = UILayoutPriority.defaultLow // 250

descSecondHeight.priority = UILayoutPriority.defaultHigh // 750

Source: https://stackoverflow.com/a/37474902/8366535

3. In Stackview cannot change color UIView (IOS 12)

Condition when subview in stackview 

example look like this

in phone 8 (IOS 12)

Should be like this
in Iphone 11 (IOS 15)

let see the code Before, it is because in ios 12 the process is slower than ios 15 

//// Code here ///

//// ----------- ///

SOLUTION

So this my solution can fix that problem use dispatchqueue async

//// ----------- ///

4. Error build after (pod install)

error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.

How to Solve

- clean build/ delete DrivedData

- pod install / pod update (again)

If still an error

- checkout to branch development/master and build app.
- If in branch master not failed back into your branch and build your app again

5. UserDefaults JSON
this example use pod swiftyJson

// set

if let model = JSON["data"].rawString(.utf8, options: .fragmentsAllowed) {

  UserDefaults.standard.setValue(model, forKey: "UserDefaultKey")

 }

//call

guard let status = UserDefaults.standard.string(forKey: "UserDefaultKey"), let data = statusOA.data(using: .utf8) else {

return nil }

6. Nil when passing data Model

When I passing optional data model like this 
example: 

In Model

In View Controller

Solution is  create a new request model with parameter

7. Error Need Install `cocoapods-keys`

Not running with Xcode Cloud, setup podfile with cocoapod-keys plugin

[!] Your Podfile requires that the plugin `cocoapods-keys` be installed. Please install it and try installation again.

The problem is my git change from `https` to `ssh` setting so my old version ruby is `2.6.1` update to `3.1.2`

Solution

- delete old `cocoapod-keys-App ` in Keychain access

$arch 

$ruby -v   

$brew     

$brew install rbenv ruby-build

$rbenv install 3.1.2  

$rbenv global 3.1.2    

$open ~/.zshrc  

$ruby -v 

$gem install cocoapods-keys

$gem install cocoapods

$gem install fastlane

$cd app    

$pod install 

8. When Cannot Run "xed ." in terminal  

This Error

app: $xcode-select --install

xcode-select: error: command line tools are already installed, use "Software Update" to install updates

Solution:

xcode-select --install

sudo xcode-select -s /Applications/Xcode.app/Contents/Developersudo xcodebuild -license accept