I am going to detect the swiping or selecting tab event in XLPagerTabStrip library in Swift 4.
I only need to get the tab index whenever selected tab is changed.
So I have checked library in Github but not found any good solutions.
thanks.
So I didn't find a solution from the library itself but, I used viewWillDisappear and for every time you swipe away of the view this function will be called.
Should be written as follows in your child view controller:
override func viewWillDisappear(_ animated: Bool) {
//Do your thing here
}
You can read more about this callback function here.
You can simply override updateContent
override func updateContent() {
super.updateContent()
// your code ....
}
Related
I am trying to catch doubleClick events from my NSOutlineView to be passed to my ViewController. My idea is to catch doubleClick events and to get the selected row from my OutlineView
What I did so far was subclassing the NSOutlineView in order to overwrite mouseDown
override func mouseDown(with event: NSEvent) {
super.mouseDown(with: event)
if event.clickCount >= 2 {
...
}
}
That works well however I don't know how to pass this event to my ViewController. The ViewController is already implementing the NSOutlineViewDelegate protocol.
I guess that the solution is not far away but somehow I am stuck.
UPDATED
Although you can set up NSGestureRecognizer for single click and NSClickGestureRecognizer for double clicks in OSX, You should probably be using the doubleAction property of the NSOutlineView directly.
Here's an example of how to set it up
This comes from a another of the Wenderlich tutorials, and there is a good discussion on SO already
I have a project set up using SWReveal for the slide out menu.
When I place a motion ended override function it never seems to be called even though everything else in the class loads (indicated with the 'loading'.
I have had a good play around and found that if I change the segue to the page to a 'show' segue the code functions as I would expect it to.
However when I use a custom segue with the SWReveal as the class the motion ended does not work.
I have attached a screen shot to help describe the issue.
Any help much appreciated.
You need to override canBecomeFirstResponder method.
override func canBecomeFirstResponder() -> Bool {
return true
}
I currently facing an issue trying to delegate SWRevealViewController panGestureRecognizer method in one of my view.
When i slide my UISlider, the panGesture interfer and open the sidemenu instead to move my slider.
i tried to delegate the panGesture and it works well, but if i quit my view and go to an other, the pangesture is not functionnal anymore, and i can't reveal my sidemenu from my second view.
My code :
class Search : UIViewController, UIGestureRecognizerDelegate{
#IBOutlet weak var sliderprice: UISlider!
override func viewDidLoad() {
super.viewDidLoad()
self.revealViewController().panGestureRecognizer().delegate = self
}
override func viewDidAppear(animated: Bool) {
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
}
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
if (touch.view == self.sliderprice){
return false
}
else{
return true
}
}
}
While this is an old question, I'll answer it anyways, maybe for someone coming from Google search it will be helpful.
After many hours of research and thinking, finally I was able to come up with multiple solutions to this problem.
The Lazy
This solution is not recommended, but working, so I decided to list it.
Before setting self as self.revealViewController().panGestureRecognizer()'s delegate, store the original self.revealViewController().panGestureRecognizer().delegate to a property, and when you leave the screen at viewWillDisappear(), set self.revealViewController().panGestureRecognizer().delegate back to the one you stored in viewDidLoad(). So in the end it gets back its original delegate. Tampering with delegates like this is never really recommended, but I said, it works.
The Nicer One
I consider this still not the best solution, but we are getting there. Find a class, a controller that you use in the whole application and gets called when you start the app. Here set the SWRevealViewController's panGestureDelegate to this class, and overwrite the gestureRecognizerShouldBeginmethod appropriately (see below).
The Best One - (in my opinion)
Now this is the best and most clear solution.
For the time being (May, 2018) the last commit to SWRevealViewController was in 2015.
Fork the original project ( https://github.com/John-Lluch/SWRevealViewController ) or simply copy the two necessary files (SWRevealViewController.m and SWRevealViewController.h) and place them into a separate folder to handle 3rd party libraries. Then you can remove SWRevealViewController from your Podfile. Don't forget to fix your imports for SWRevealViewController where you have it.
Now you are free to modify the files. What I suggest is the following.
Go to SWRevealViewController.m and implement the following method:
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldReceiveTouch:(UITouch *)touch
{
return ![touch.view isKindOfClass:UISlider.class];
}
If the touched view is a UISlider (or a custom class that inherits from UISlider) the gesture won't begin, meaning the pan gesture will no longer be conflicted with the UISlider's pan gesture.
I seriously hope I could help anyone out there as this problem was a pain in my back for quite some time now.
I thought that Today View every time when i open it it calls "viewWillAppear" but its not. When i change something in my app, and then I slide down for Today View it sometimes refresh the view and sometimes not.
I do all logic in viewWillAppear (fetch data from coreData and put that data to labels), but its not called everytime.
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
fetchContent()
setLabels()
setContentHeight()
tableView.reloadData()
print("view will appear")
}
how to call fetchContent and setLabels every time when user opens Today Extensions?
For this matter you should be using NSWidgetProvinding's widgetPerformUpdateWithCompletionHandler.
Steps:
1.- Make sure that your UIViewController implements NCWidgetProviding
class MainViewController: UIViewController, NCWidgetProviding
2.- Add the following function:
func widgetPerformUpdateWithCompletionHandler(completionHandler: ((NCUpdateResult) -> Void)) {
// Perform any setup necessary in order to update the view.
// If an error is encountered, use NCUpdateResult.Failed
// If there's no update required, use NCUpdateResult.NoData
// If there's an update, use NCUpdateResult.NewData
completionHandler(NCUpdateResult.NewData)
}
3.- In your case you will be using .NewData.
Just make sure that you retrieve needed data and refresh your views (putting every data in place, filling labels, graphs, etc).
Nevermind the fact that your view is not visible during the call to this function, iOS will fill the view and take a snapshot of it.
Then that's what it shows while you are opening notification center and until you gain control again of your app.
So, in your case would be something like this:
func widgetPerformUpdateWithCompletionHandler(completionHandler: ((NCUpdateResult) -> Void)) {
fetchContent()
setLabels()
setContentHeight()
tableView.reloadData()
completionHandler(NCUpdateResult.NewData)
}
Swift 2.1 && Xcode 7.2
It looks like some bug appears when you many time recompile this today extension. solution is to remove from notification center and add it again. then it refresh fine everytime opened
I am trying to learn Swift. I currently have a button that plays an animation but I want to have the animation start immediately after the app loads. How would I go about doing that?
You need to put your animation on the viewDidApear method, while will be called after your viewDidLoad method.
For example
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
UIView.animateWithDuration(2, animations: {
//do what ever here
})
}
Your question is not very specific so I'm not sure if this answers your question.
When your iOS application starts, there is usually a View Controller that gets rendered on the screen as your main entry point. This can be changed in in your AppDelegate.swift
Now, let's assume that in your application, a view controller named WelcomeViewController is the first page and you have your button along with the rest of your logic in it. Every view controller has certain functions that you can override and use. For example:
viewDidLoad
viewDidAppear
viewWillAppear
viewWillDisappear
the names are self-explanatory so I'm sure you can guess what they do. In your case, just override viewDidAppear and start your animation in there.
override func viewDidAppear(animated: Bool) {
...
}