Showing posts with label Interface Builder. Show all posts
Showing posts with label Interface Builder. Show all posts

Saturday, June 30, 2018

Handling background touches: UIControl instead of UITapGestureRecognizer

Usually, to handle background touches on a View Controller we add a UITapGestureRecognizer. The setup requires a few lines of code, but there is a way, you can handle background touches even more easy!

What you need to do is just to change the root view type from UIView to UIControl and attach an action. With Storyboard:
  1. Select the root view.
  2. In the Identity inspector simply change the type to UIControl. (Serious type change isn't required.)
  3. Finally, connect an action to the Touch Down event using Connections inspector.
Then the action can be utilized, for example, to hide a keyboard: @IBAction func backgroundTouched(_ sender: Any) { // Hide keyboard view.endEditing(true) }
If any child control interrupts a touch, it wouldn't be delivered to the background control! This is the main pro and con of this method. Sometimes it's exactly the desired behaviour to ignore touches on buttons. But other times you need to handle all the touches anywhere in the View Controller, like if you have a large UITextView and you want to hide the keyboard by tap.

Saturday, February 3, 2018

Changing view's type on the Storyboard

Suppose the design of your app changed, and now you need to replace the Table View with a Collection View keeping all the constraints along with views hierarchy.
Drop a new View Controller on the storyboard and put a Collection View inside. Rename it in the left panel (called Document Outline). Name it "The Replacement" so you will be able recognize it later. Now switch to the Source Code through the Open As.
Now the storyboard looks like XML markup. Find the Table View you need to replace, it will be scoped within the tableView tag.

Copy its id (example: id="8Oa-xL-ums"). It points to the view in constraints and outlets. Now find the new Collection View under the collectionView tag.

Copy everything including the enclosing tags: <collectionView ...</collectionView> and paste it instead of the tableView. Replace Collection View's id with the value you copied from the Table View. Before switching back to Interface Builder you need to clean up the storyboard. Remove the scene of the temporary View Controller that you created at the beginning of the tutorial. Delete everything between tags and the preceding comment: <!--View Controller><scene ...</scene>. If you don't do this you will have an error because of duplicated id.

Now you will have the new Collection View constrained like the Table View but misplaced, because it's was copied with the rect.
Click Update Frames and enjoy the result!

Here is the list of storyboard tags for different UI classes. Who knows, may be it will be useful.

arscnView ARSCNView
arskView ARSKView
glkView GLKView
mapView MKMapView
mtkView MTKView
sceneKitView SCNView
skView SKView
activityIndicatorView UIActivityIndicatorView
button UIButton
collectionView UICollectionView
datePicker UIDatePicker
imageView UIImageView
label UILabel
navigationBar UINavigationBar
pageControl UIPageControl
pickerView UIPickerView
progressView UIProgressView
scrollView UIScrollView
searchBar UISearchBar
segmentedControl UISegmentedControl
slider UISlider
stackView UIStackView
stepper UIStepper
switch UISwitch
tabBar UITabBar
tableView UITableView
textField UITextField
textView UITextView
toolbar UIToolbar
view UIView
containerView UIView (with embedded View Controller)
visualEffectView UIVisualEffectView
webView UIWebView
wkWebView WKWebView

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