I've just started work on a new game in which the player will fire a projectile by swiping in the direction he needs it to go in. I know how to detect if a swipe is left, right, up, or down using gesture recognizer, but I need to know how to get the angle of the swipe so the projectile can be fired in whatever direction and at whatever angle the player desires.
Sounds like you want to use a UIPanGestureRecognizer instead. Unlike the swipe recognizer, it's called continuously but with different states, so you could do something as simple as just handling the start and end states.
Docs:
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIPanGestureRecognizer_Class/index.html
Related
I am trying to make a game in SWIFT (SpriteKit) where the user can pick between a large amount of characters to play as during the game. The 'characters' would be in what looks like a horizontal picker view. It is similar to the app "Ball King's" player chooser that looks like this:
and
I do not know where to start and any help would be great! Thank you!
Just set up a UISwipeGestureRecognizer in your view. When a swipe is detected, get the direction of the swipe and either display the next or previous sprite with an animation. If you haven't used gesture recognizers documentation is here. Another option is to simply detect swipes generically using touchesBegan, touchesMoved, etc.
I have a question.
I have a SKScene in which I want the user to be able to move it with a UIPanGesture and when the user stops panning, I want the SKScene to have a ease out smooth animation.
If you have played Clash of Clans, you will be familiarised with this. Is the same animation as when you pan navigate through your home village.
Which could be the best way to achieve this?
And how can I add boundaries to it, for it to stop moving when it reaches a certain point in the view?
I'm making a game on the iPad where the player swipes up, down, left, or right to move the character. An attack is controlled by touchesBegan:withEvent:
My problem is that the character attacks whenever he moves.
Is there a way to set up a swipe gesture so the code doesn't run touchesBegan:withEvent: until it sees if the motion is the beginning of a swipe or not?
This is not too easy of a task. Without using some custom gestures I would suggest you to try the combination of UISwipeGestureRecognizer and UILongPressGestureRecognizer. I know this sound silly but it is not: An UILongPressGestureRecognizer acts pretty much the same as the pan gesture so even if the finger is dragged you will receive events. You need to set some proper minimum duration till it fires (depends on the swipe gesture) and some large minimum drag length so it doesn't get canceled for dragging. You need to remove the touch event methods then and move the code to long press gesture action.
To explain the result, your long press gesture will (if set correctly) work just the same as touch events except it will wait for specified duration. If in that duration a swipe is detected your long press gesture will not fire. Seems just what you need...
I am using a UIPanGestureRecogniser to implement drag and drop. When the drag starts I need to identify the object that is being dragged. However the objects are relatively small. And if the user doesn't hit the object right in the centre of the object it isn't getting dragged.
The problem is that when the gesture handler is first called with the state UIGestureRecognizerStateBegan, the finger has already moved several pixels, and so [UIPanGestureRecognizer locationInView:] returns that point, which is not where the gesture truly started. That makes sense as it can only recognize a pan after a few pixels of movement. However, I need the absolute start of the gesture, not the position after the gesture has first been recognized.
I'm thinking that maybe I need to implement a tap gesture recognizer as well, purely to capture the first touch. But that seems like a hack for what is not an unusual requirement. Is there no other way of getting that first touch from within the pan gesture recognizer?
UIGestureRecognizerDelegate protocol provides methods gestureRecognizerShouldBegin: and gestureRecognizer:shouldReceiveTouch: that can help you evaluate the touches before the pan has transitioned to state UIPanGestureRecognizerStateBegan
I'm new to developing iOS apps,
I've successfully implemented a Swipe Gesture Recognizer,
What I was wondering is if there is an easy to use recognizer like the swipe gesture. That would let you implement the homescreen page turning effect but just on a small view in the view controller?
If your unclear on what effect I mean, when you look at the iPhone's homescreen you can drag your finger and it responds instantly (unlike swipe) and also has some spring feeling to it, is this some effect I can use, or do I manually have to program this into the code if so is there a tutorial that explains this?
Thanks,
I hope my question makes sense.
Have a look at UIPanGestureRecognizer:
https://developer.apple.com/library/ios/documentation/uikit/reference/UIPanGestureRecognizer_Class/Reference/Reference.html
UIPanGestureRecognizer is a concrete subclass of UIGestureRecognizer
that looks for panning (dragging) gestures. The user must be pressing
one or more fingers on a view while they pan it. Clients implementing
the action method for this gesture recognizer can ask it for the
current translation and velocity of the gesture.
A panning gesture is continuous. It begins
(UIGestureRecognizerStateBegan) when the minimum number of fingers
allowed (minimumNumberOfTouches) has moved enough to be considered a
pan. It changes (UIGestureRecognizerStateChanged) when a finger moves
while at least the minimum number of fingers are pressed down. It ends
(UIGestureRecognizerStateEnded) when all fingers are lifted.
Clients of this class can, in their action methods, query the
UIPanGestureRecognizer object for the current translation of the
gesture (translationInView:) and the velocity of the translation
(velocityInView:). They can specify the view whose coordinate system
should be used for the translation and velocity values. Clients may
also reset the translation to a desired value.
Edit: The spring feeling part you would need to implement yourself. Since iOS 7 there is UIDynamics which contains different animators, for what you describe you may need UIGravityBehavior and maybe UICollisionBehaviour. Look at the WWDC 2013 videos for this topic, I think you will find some examples there.