I'm trying to add a pin (MKAnnotation and MKAnnotationView) to my MKMapView and allow the user to drag it around.
I'd also like to make the dragging of the pin animated and interactive like the iPhone's Map App.
My question is how do I change the state of the MKAnnoationView so that it's hovering over the map (so the pin isn't actually inside the map)?
I'm not 100% sure how to do this.
At present, my colleague as found an hovering image that he swaps with the default MKAnnotationView, but that means I can't easily animate between the two.
Not sure what you exactly want to do but I have used Apple's example in the iPhone App Programming Guide (Handling Events in an Annotation View) to implement the draggable pin.
It has a partial code but tha may be enough for you to figure it out.
Basically, you must subclass the MKAnnnotation and MKPinAnnotationView and in your CustomAnnotationView class you have to implement delegate methods to handle touch events, as shown in the Apple example.
There was a bit of filling out or modification needed because the code snippet was not complete, but I have reproduced the behaviour of the pin on the Apple's iPhone Map app exactly (except that I did not implement the right accessory button).
In it, the pin feels like it is hovering. So, I suspect that you have no need for the hovering image you have mentioned.
I also presume that by providing a BOOL property, you could make the pin draggable or "fixed" programmatically.
Does this help?
Related
I tried implementing the selecting multiple items with a two-finger pan gesture. However, the checkmarks didn't always appear and disappear when tapping edit to start the process, or tapping done when finished.
I later discovered that it works fine when using a UITableViewController after choosing the different controller from cocoa touch menu, instead of the UIViewController and UITableView I was using before.
So my question is: is it correct for me to now assume that these gestures when used in a table are really meant for a dedicated table view controller (with all the extra functionality you only get from it)?
Without any example code, I can't really see what might be going wrong. Have a look at the documentation to see if you are implementing it correctly.
https://developer.apple.com/documentation/uikit/uitableviewdelegate/selecting_multiple_items_with_a_two-finger_pan_gesture
I need to remove the Standard Callout from the mapview and want to display my custom callout. My custom Callout is having image and many fields. I am designing my custom callout in interface builder.
How I can display my custom callout ?
I have referred to the link "Custom callout Bubble", But I want to display the custom callout from xib.
It's not simple, but you can do it.
You need to create an alternative MKAnnotationView (BubbleView) and show it when you select the first one.
It's possible to differentiate the AnnotationView from BubbleView in delegate.
You have a lot of work to do, this tutorial can help you to understand the passages, but pay attention on iOS 6, some things are changed and there are some problems in BubbleView positioning
http://www.jakeri.net/2009/12/custom-callout-bubble-in-mkmapview-final-solution/
Custom callouts are nearly impossible to implement. You have to simulate a callout by adding your own custom MKAnnotationView to your MKAnnotations, listen to their selection, then listen to your MKANnotationView's didMoveToSuperView callbacks to handle your own animations and drawing.
My implementation on the iPad took weeks to get right and if I were to do it again I wouldn't use Apple's MapKit at all. I'd use another mapping framework altogether that made the process easier.
tldr - you can't do it - trust me
I have just managed to implement detection of a swipe gesture for my app. However I would like to confine the area where the gesture is valid. Thinking about this I came up with a possible solution which would be to check whether the start & finish coordinates are within some area. I was just wondering if there's a better or preferred method of doing something like this.
Simply create an invisible UIView (= with transparent background) and set its frame so it encloses the region you want to detect the gesture into.
Then, simply add a UISwipeGestureRecognizer to that view, and you are done.
Read the generic UIGestureRecognizer Class Reference and the part of the Event Handling Guide for iOS that talks about UIGestureRecognizers for more info.
Of course you could also manage the detection of the swipe gesture by yourself using custom code like explained here in the very same guide but why bother when UIGestureRecognizers can manage everything for you?
I'm about to start a new iPhone app that requires a certain functionality but I'm not sure if it's doable. I'm willing to research but first I just wanted to know if I should at least consider it or not.
I haven't seen this in an app before (which is my main concern, even though I haven't seen too many apps since I don't own an iPhone), but an example would be the iPhone shortcuts panels: you can hold on an app, and then drag it to another panel, sweeping while still dragging it. But this is the core app, is it possible to reproduce something similar within a normal app?
I only need to be sure it can be done before I start digging, I don't need code examples or anything, but if you have some exact resources that you consider helpful, that would be appreciated.
Thanks!
Yes. If you have your custom UIView subclass instance inside a UIScrollView, your view controller just needs to set the UIScrollView to delay content touches and not allow it to cancel touch events.
[scrollView setCanCancelContentTouches:NO];
[scrollView setDelaysContentTouches:YES];
When the user taps and holds in the custom view, the event goes to that custom view, which can process the touch events to drag an item around, but if the user quickly swipes, it scrolls the view.
The "panel" view that you're referring to appears to be a UIPageControl view — although, perhaps, the specific incarnation of this view that Apple uses for the iPhone's home page may be customized.
Instances of generic UIView views that you might touch-and-drag will receive touch events. By overriding methods in the view, these events can be processed and passed to the page control, in order to tell it to "sweep" between pages.
If I wanted to do what you're asking about, that's how I might approach it. It seems doable to me, in any case.
Start with this: Swip from one view to the next view
Try using a UIButton that tracks the time since the state of the button changed to "highlighted". You may need to do this in order to track the dragging and move the button around:
Observing pinch multi-touch gestures in a UITableView
Check to see if the button starts overlapping one side of the screen while being dragged. If s certain amount of time elapses since the button first started overlapping the edge and then manipulate the UIScrollView so that it switches to the next page on the corresponding side of the screen
You may need to use NSTimer to keep track of how long the button is held down, etc.
In any case there's no reason why this couldn't work.
If UIButton doesn't work then perhaps try a custom subclass of UIControl (which tracks the same touch down actions etc.). If that doesn't work then use the window event intercept thing to track everything.
I'm trying to create a modal status indicator display for an iPhone app, and would like one similar to this one used in Tweetie:
Specifically, this one "shades out" the entire screen, including the toolbar. I don't believe through any normal UIView manipulation, I can extend past the bounds of my window, can I? I believe I've seen a status indicator like this somewhere else on iPhone, possibly when I added an Exchange e-mail account.
I've tried subclassing UIAlertView and overriding its drawRect method. If I don't call [super drawRect:] it doesn't ever display the normal UIAlertView text box, however my drawing rectangle is in an odd size and position.
Anyone have any advice to accomplish this?
Check out MBProgressHUD.
Take a look at the source code to the WordPress application. They have code which you can basically drag and drop into your application to do this.
http://iphone.wordpress.org/development/
I haven't done this myself, but you could layer a UIView at the top of the view hierarchy, and use setHidden to dynamically show or hide it. Since it's at the top of the stack, it should be able to intercept all touch events.