How can I have my MKMapView follow my user around until they scroll, and then have a button to follow the user around again?
Here is the flow I would like it to have.
View Loads:
Zoom in and center on the users current location, then follow the user around.
User scrolls:
Do nothing until a button is pressed
Button pressed:
Same code as 'View Loads'
Your location manager is continuously providing you with new location information via the delegate method locationManager:didUpdateToLocation:fromLocation:. Change the map's region whenever you get an update. Before doing so, check a flag ("shouldFollowCurrentLocation" or similar) that is set by default. You will unset the flag when your map view delegate gets mapView:regionWillChangeAnimated: (you will of course have to keep track of the occasions when you cause the region to change programmatically) and reset it in the button's action method.
Related
So I have a menu bar application that has a slider inside a custom view: I want the ability to press the option key while dragging to make the slider snap to increments.
Right now, everything is working... except I cannot find a single way to notify my menu app that the option key is being pressed. Here's what I've tried:
NSEvent.addGlobalMonitorForEvents
"Note that your handler will not be called for events that are sent to your own application."
NSEvent.addLocalMonitorForEvents
"Your handler will not be called for events that are consumed by nested event-tracking loops such as control tracking, menu tracking, or window dragging"
NSApplication.shared.currentEvent
This dosesn't work because the flagsChanged event isn't handled by the app, so this value is set to another value (mouse button presses).
flagsChanged(with event: NSEvent)
This doesn't get called. I've set the viewController to acceptFirstResponder as well as resigned the first responder of the view. Also, I've subclassed the view and overridden flagsChanged and that hasn't worked.
I've tried creating a menu item that has a key like "s" or "p" to trigger an action. But when the "action" gets triggered, the menu bar hides...
So I'm trying to find how I can be notified when the option key is pressed. Is this possible? I can clarify if you have any questions.
In your custom slider view's mouseDragged method, you'd simply check the NSEvent parameter's modifierFlags to see if it contains the option key.
--
Since it could be interpreted that the slider is an actual NSSlider, if that's the case then the slider's control is really implemented in with an NSSliderCell, and the mouse tracking gets handed off from the view to the cell within mouseDown, so the NSSlider's mouseDragged wouldn't be called, and instead you'd have to do work in the cell's trackMouse:inRect:... method. But if you're using an NSSlider, then you'd probably simply want to use altIncrementValue.
I've been struggling with this for a while already and some
help would be useful.
Imagine I have a UIButton, which starts in highlighted/selected state.
If a user taps it, then highlighted/selected state changes.
I've implemented this and it works fine. Problems start
for example if user taps inside the button region,
does not release her/his finger, and moves mouse
outside the button area -- at this time my Button
would usually lose highlighted/selected state.
Anyway, I have solved this issue too, by overriding UIControlEventTouchUpOutside
and making button keep the state it had before...
But now another problem comes in, similar to the above,
if a user taps the button, does not release his/her
finger, and moves the finger to the right say (horizontally,
which also makes my dialog for instance go to the right),
then I again lose "selected/highlighted" state....
I believe again some kind of gesture similar to - but different -
than UIControlEventTouchUpOutside is being called which
removes my selected state...
Do you know what can be going in here? Any advice appreciated.
ps. I have fixed all the issues by just setting different images
for normal/selected states using the interface builder.
For the highlighted effect you can use the: setHighlighted of UIButton class.
When you start touching the button set the highlighted property of button to YES.
when you start touch:
yourButton.highlighted = YES;
When you stop touch:
yourButton.highlighted = NO;
I have fixed all the issues by just setting different images for normal/selected states using the interface builder.
I have a custom MKAnnotationView subclass. It is showing the view exactly as I want it to. In that view, I have a button. I want to capture events on the button to perform an action. This works just fine.
However, I do NOT want the callout to be dismissed or disappear. Basically, touching the button in the callout will start playing a sound, but I want to leave the annotation up so the user can press stop if they want to, without having to touch the map pin again to bring the annotation back up. In another instance, I want the button touch to animate more details in the callout, so I definitely don't want to dismiss the callout at that point.
How can I keep the callout from disappearing whenever the user selects the callout or a button inside the callout?
This may not be the best solution, but it definitely works. First off, I tried a number of things, like observing for context and such, but I never got past crashing, and it seemed cumbersome. So, this is what I did:
I first specified what the controlling factor was for keeping an alert viewable. In my case, I created a custom annotation view, and whenever the user clicks a button on that custom view, I want it to stay visible, and maybe even change the content. So, I set a delegate on that custom view so that my map can know when something changes. In my map view controller, I catch that message and set a class member variable to true to signify that I want the annotation view to stay.
NOTE: This will happen before the selection messages occur.
Now, in my didDeselectAnnotation method, I check the boolean value. If I want to keep it visible, I opt to NOT remove my annotation, I reset the boolean value, and I re-select the annotation manually, setting animation to NO. This lets the annotation view "stay" visible--maybe a cheat, but the user can't see the difference. Whenever that boolean value says that deselection is ok, I simply remove the annotation and all is well.
So, the workflow is this:
Touch pin
CustomAnnotationView is displayed
User clicks a button on CustomAnnotationView, which notifies the delegate (mapView) that the
action occurred
Set the class boolean value to know that you want to keep the annotation around
mapView then calls didDeselectAnnotation method
In didDeselectAnnotation method, use conditional to decide if you should remove the annotation, or keep it around by not removing the annotation and manually re-selecting it without animation.
I hope this helps others. It took me a while to figure this out, so I hope it saves you time.
If you find a better solution, by all means, please post it here!
you can suppress callout closing by using hittest, check this following post.
Detect tap on title of callout
When you touch a UIButton it hides for a fraction of second and then it executes its action. This fast "blink" is the feedback the user needs to know that the button has been clicked.
In the project I am doing, I need to select the button programmatically, as if the user had clicked it. In other words, the same behavior has the button had been clicked by the user... a fast blink and execution of its action.
Is this possible to do?
thanks for any help.
The change in the appearance of the button is effected by setting the button's highlighted property. The property is automatically set to YES when the user touches down on the button, and back to NO when she releases.
The highlighted property is writable, so you can set it YES yourself to simulate a touch down. You'll probably want to use +[NSTimer scheduledTimerWithTimeInterval:invocation:repeats:] to set it back to NO after a short interval.
It is pretty simple, and probably there is a better solution.
First, use images to your button, and when you have to fire the button, you just change the button's image in the normal state to the pressed image, and after that, replace it back to the original. You can simply do it with a timer.
I am currently using a UIPIckerView in my app to allow a user to select from a list of options. The problem is that there isn't enough of a delay when the user stops spinning the wheel and it is selecting a value before the user has a chance to scroll further down the list.
Is there a way to override the default behavior that selects the row as soon as the wheel stops spinning and the user removes their finger? I see Mobile Safari includes a "Done" button which would be great.
I can provide code if necessary (not sure how it would help).
Thanks!
You can add this manually; just add a done button to the view that holds the UIPicker, and have IT do whatever action you're currently performing in – pickerView:didSelectRow:inComponent:.
The UIPickerView automatically selects which ever row stops in the center. It does not work like a table but more like a popup menu. As such, you can't use a picker view like a button to call an action because it will trigger the moment the user stops moving it whether that represents their final choice or not.
Instead, as noted previously, you need a second control element (usually a button) to call the action that makes use of the pickerview's selection.