PeterHarding: Created page with "=Some Notes on Problems I've Encountered= ==iOS 10: “"[App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction== See - http..."

2021-10-16T10:31:15Z

Created page with "=Some Notes on Problems I've Encountered= ==iOS 10: “"[App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction== See - http..."

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=Some Notes on Problems I've Encountered=

==iOS 10: “"[App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction==

See - http://stackoverflow.com/questions/38458170/ios-10-app-if-were-in-the-real-pre-commit-handler-we-cant-actually-add-any

This fixed it - In your Xcode UI:

* Click on your active scheme name right next to the Stop button
* Click on Edit Scheme....
* in Run (Debug) select the Arguments tab
* in Environment Variables click '+'
* add the variable: OS_ACTIVITY_MODE with Value: disable

=How do I Add an ActivityIndicator?=

I found this a useful reference - http://stackoverflow.com/questions/2638120/can-i-change-the-size-of-uiactivityindicator

Added the following to my (TableView)ViewController to get an ActivityIndicator which data was requested (over the Internet) and loaded into the TableView

<pre>

var activityIndicator: UIActivityIndicatorView?

private var data = [Data]()
{
didSet {
tableView.reloadData()
activityIndicator?.stopAnimating()
}
}

...

func startActivityIndicator(_ scale: CGFloat) -> UIActivityIndicatorView?
{
let ai = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.gray)

ai.frame = CGRect(x: 0, y: 0, width: 50, height: 50)

ai.scale(factor: 2.0)

// let transform: CGAffineTransform = CGAffineTransform(scaleX: scale, y: scale)

// ai.transform = transform

ai.center = self.view.center

ai.startAnimating()

self.view.addSubview(ai)

return ai

}

...

private func loadData()
{
activityIndicator = startActivityIndicator(2.0)

let request = DataRequest()

request.fetchData { [weak self] newData in
self?.data = newData
}
}
</pre>

==How do I Scale It?==

Nice solution from StackOverflow link was to add an extension to the ViewController source file:

<pre>
extension UIActivityIndicatorView {
func scale(factor: CGFloat) {
guard factor > 0.0 else { return }

transform = CGAffineTransform(scaleX: factor, y: factor)
}
}
</pre>

=Waltzing with the Software Keyboard=

I have a TextField in a Navigation Bar which I want to use to enter some search text. When I give focus to the TextField the keyboard appears. I am still working on getting this to close the keyboard once it is shown:

A Google search turned up this - http://stackoverflow.com/questions/18755410/how-to-dismiss-keyboard-ios-programmatically

<pre>
@IBOutlet weak var searchTextField: UITextField!

...

override func viewDidLoad()
{
super.viewDidLoad()

...

let tap = UITapGestureRecognizer(target: self, action: #selector(onTouchGesture))

self.view.addGestureRecognizer(tap)

}

func textFieldShouldReturn(textField: UITextField) -> Bool
{
if (textField.returnKeyType == UIReturnKeyType.default)
{
if let next = textField.superview?.viewWithTag(textField.tag+1) as? UITextField
{
next.becomeFirstResponder()
return false
}
}

textField.resignFirstResponder()

return false
}

func onTouchGesture()
{
searchTextField?.resignFirstResponder()

self.view.endEditing(true)
}
</pre>

The Tap recognizer works. But I haven't managed to do a resignFirstResponder() on the TextField.

Added an IBOutlet to reference the TextField and used this to send a resignFirstResponder() message when I tap outside the keyboard. This much works but isn't the final solution.

Sending an endEditing message to the searchTextField works and seems cleaner:

<pre>
func onTouchGesture()
{
// searchTextField?.resignFirstResponder()

searchTextField?.endEditing(true)
}
</pre>

These look useful:

* https://grokswift.com/uitextfield/
* https://developer.apple.com/library/content/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/ManageTextFieldTextViews/ManageTextFieldTextViews.html

[[Category:IOS]]

IOS 10 Problems - Revision history

PeterHarding: Created page with "=Some Notes on Problems I've Encountered= ==iOS 10: “"[App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction== See - http..."