I'm having trouble receiving keyboard events within a subclass of NSView.
I can handle mouse events fine, but my keyDown and keyUp methods are never called. It was my understanding per the documentation that both types of events follow the same hierarchy, however this is seemingly not the case.
Is this a first responder issue? Some field somewhere grabbing the focus? I've tried overriding that but no luck.
Any insights would be greatly appreciated.
If you'd like to see.. this is within a custom NSView class:
#pragma mark -
#pragma mark I/O Events
-(void)keyDown:(NSEvent *)theEvent {
NSLog(#"Sup brah!");
}
-(void)keyUp:(NSEvent *)theEvent {
NSLog(#"HERE");
}
// This function works great:
-(void)mouseDown:(NSEvent *)theEvent {
NSNumber *yeah = [[NSNumber alloc] initWithBool:YES];
NSNumber *nah = [[NSNumber alloc] initWithBool:NO];
NSString *asf = [[NSString alloc] initWithFormat:#"%#", [qcView valueForOutputKey:#"Food_Out"]];
if ([asf isEqualToString:#"1"]) {
[qcView setValue:nah forInputKey:#"Food_In"];
best_food_x_loc = convertToQCX([[qcView valueForOutputKey:#"Food_1_X"] floatValue]);
best_food_y_loc = convertToQCY([[qcView valueForOutputKey:#"Food_1_Y"] floatValue]);
NSLog(#"X:%f, Y:%f",best_food_x_loc, best_food_y_loc);
} else {
[qcView setValue:yeah forInputKey:#"Food_In"];
}
}
You have to set your NSView to be first responder
- (BOOL)acceptsFirstResponder {
return YES;
}
Related
I am implementing session inactivity for my app so that if user is inactive for 30 seconds, then show him a new uiviewcontroller as a formsheet. For touch event, i am using this code
(void)sendEvent:(UIEvent *)event {
[super sendEvent:event];
// Only want to reset the timer on a Began touch or an Ended touch, to reduce the number of timer resets.
NSSet *allTouches = [event allTouches];
if ([allTouches count] > 0) {
// allTouches count only ever seems to be 1, so anyObject works here.
UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
if (phase == UITouchPhaseBegan || phase == UITouchPhaseEnded) {
[[BCDTimeManager sharedTimerInstance]resetIdleTimer];
}
}
}
In BCDTimeManager class which is a singleton class i have implemented resetIdleTimer and idleTimerExceed method
#import "BCDTimeManager.h"
#implementation BCDTimeManager
__strong static BCDTimeManager *sharedTimerInstance = nil;
NSTimer *idleTimer;
NSTimeInterval timeinterval;
+ (BCDTimeManager*)sharedTimerInstance
{
static dispatch_once_t predicate = 0;
dispatch_once(&predicate, ^{
sharedTimerInstance = [[self alloc] init];
NSString *timeout = [[NSUserDefaults standardUserDefaults] valueForKey:#"session_timeout_preference"];
timeinterval = [timeout doubleValue];
});
return sharedTimerInstance;
}
- (void)resetIdleTimer {
if (idleTimer) {
[idleTimer invalidate];
}
idleTimer = nil;
NSLog(#"timeout is %ld",(long)timeinterval);
idleTimer = [NSTimer scheduledTimerWithTimeInterval:timeinterval target:self selector:#selector(idleTimerExceeded) userInfo:nil repeats:true];
}
- (void)idleTimerExceeded {
NSLog(#"idle time exceeded");
[[NSNotificationCenter defaultCenter]
postNotificationName:#"ApplicationTimeout" object:nil];
}
But when i do any touch on the screens, in console, i can see NSLog is printed twice which is causing my NSNOtification action to be triggered twice.
I am not sure what i am doing wrong. Please help me to figure out this.
I figured it out. Code is doing right. I am seeing NSLog twice because of two touch event one touch began and one touch ended. So, this code is correct without any issue. Something is wrong with observers add or remove method. I will look into that
I have a mac cocoa app with a webview that contains some text. I would like to search through that text using the default find bar provided by NSTextFinder. As easy as this may seem reading through the NSTextFinder class reference, I cannot get the find bar to show up. What am I missing?
As a sidenote:
- Yes, I tried setting findBarContainer to a different view, same thing. I reverted back to the scroll view to eliminate complexity in debugging
- performTextFinderAction is called to perform the find operation
**App Delegate:**
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
self.textFinderController = [[NSTextFinder alloc] init];
self.webView = [[STEWebView alloc] initWithFrame:CGRectMake(0, 0, self.window.frame.size.width, 200)];
[[self.window contentView] addSubview:self.webView];
[self.textFinderController setClient:self.webView];
[self.textFinderController setFindBarContainer:self.webView.enclosingScrollView];
[[self.webView mainFrame] loadHTMLString:#"sample string" baseURL:NULL];
}
- (IBAction)performTextFinderAction:(id)sender {
[self.textFinderController performAction:[sender tag]];
}
**STEWebView**
#interface STEWebView : WebView <NSTextFinderClient>
#end
#implementation STEWebView
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self) {
}
return self;
}
- (void)drawRect:(NSRect)dirtyRect
{
// Drawing code here.
}
- (NSUInteger) stringLength {
return [[self stringByEvaluatingJavaScriptFromString:#"document.documentElement.textContent"] length];
}
- (NSString *)string {
return [self stringByEvaluatingJavaScriptFromString:#"document.documentElement.textContent"];
}
In my tests, WebView.enclosingScrollView was null.
// [self.textFinderController setFindBarContainer:self.webView.enclosingScrollView];
NSLog(#"%#", self.webView.enclosingScrollView);
Using the following category on NSView, it is possible to find the nested subview that extends NSScrollView, and set that as the container, allowing the NSTextFinder to display beautifully within a WebView
#interface NSView (ScrollView)
- (NSScrollView *) scrollView;
#end
#implementation NSView (ScrollView)
- (NSScrollView *) scrollView {
if ([self isKindOfClass:[NSScrollView class]]) {
return (NSScrollView *)self;
}
if ([self.subviews count] == 0) {
return nil;
}
for (NSView *subview in self.subviews) {
NSView *scrollView = [subview scrollView];
if (scrollView != nil) {
return (NSScrollView *)scrollView;
}
}
return nil;
}
#end
And in your applicationDidFinishLaunching:aNotification:
[self.textFinderController setFindBarContainer:[self scrollView]];
To get the Find Bar to appear (as opposed to the default Find Panel), you simply have to use the setUsesFindBar: method.
In your case, you'll want to do (in your applicationDidFinishLaunching:aNotification method):
[textFinderController setUsesFindBar:YES];
//Optionally, incremental searching is a nice feature
[textFinderController setIncrementalSearchingEnabled:YES];
Finally got this to show up.
First set your NSTextFinder instances' client to a class implementing the <NSTextFinderClient> protocol:
self.textFinder.client = self.textFinderController;
Next, make sure your NSTextFinder has a findBarContainer set to the webView category described by Michael Robinson, or get the scrollview within the webView yourself:
self.textFinder.findBarContainer = [self.webView scrollView];
Set the find bar position above the content (or wherever you wish):
[self.webView scrollView].findBarPosition = NSScrollViewFindBarPositionAboveContent;
Finally, tell it to show up:
[self.textFinder performAction:NSTextFinderActionShowFindInterface];
It should show up in your webView:
Also, not sure if it makes a difference, but I have the NSTextFinder in the XIB, with a referencing outlet:
#property (strong) IBOutlet NSTextFinder *textFinder;
You may also be able to get it by simply initing it like normal: self.textFinder = [[NSTextFinder alloc] init];
I have set up an NSCollectionView in a cocoa application. I have subclassed the collection view's NSCollectionViewItem to send me a custom NSNotification when one of its views it selected / deselected. I register to receive a notification within my controller object when this notification is posted. Within this method I tell the view that has just been selected that it is selected and tell it to redraw, which makes it shade itself grey.
The NSCollectionViewItem Subclass:
-(void)setSelected:(BOOL)flag {
[super setSelected:flag];
[[NSNotificationCenter defaultCenter] postNotificationName:#"ASCollectionViewItemSetSelected"
object:nil
userInfo:[NSDictionary dictionaryWithObjectsAndKeys:(ASListView *)self.view, #"view",
[NSNumber numberWithBool:flag], #"flag", nil]];}
The Controller Class (in the -(void)awakeFromNib Method):
//Register for selection changed notification
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(selectionChanged:)
name:#"ASCollectionViewItemSetSelected"
object:nil];
And the -(void)selectionChanged:(NSNotification *)notification method:
- (void)selectionChanged:(NSNotification *)notification {
// * * Must get the selected item and set its properties accordingly
//Get the flag
NSNumber *flagNumber = [notification.userInfo objectForKey:#"flag"];
BOOL flag = flagNumber.boolValue;
//Get the view
ASListView *listView = [notification.userInfo objectForKey:#"view"];
//Set the view's selected property
[listView setIsSelected:flag];
[listView setNeedsDisplay:YES];
//Log for testing
NSLog(#"SelectionChanged to: %d on view: %#", flag, listView);}
The application that contains this code requires there to be no empty selection within the collection view at any time. This is where i get my problem. I've tried checking when a view's selection is changed and reselecting it if there is no selection, and manually selecting the views using NSCollectionView's
-(void)setSelectionIndexes:(NSIndexSet *)indexes
But there is always a situation which occurs that causes there to be an empty selection in the collection view.
So I was wondering if there is an easier way to prevent an empty selection occurring in an NSCollectionView? I see no checkbox in interface builder.
Thanks in advance!
Ben
Update
I ended up just subclassing my NSCollectionView, and overriding the - (void)mouseDown:(NSEvent *)theEvent method. I only then sent the method [super mouseDown:theEvent]; if the click was in one of the subviews. Code:
- (void)mouseDown:(NSEvent *)theEvent {
NSPoint clickPoint = [self convertPoint:theEvent.locationInWindow fromView:nil];
int i = 0;
for (NSView *view in self.subviews) {
if (NSPointInRect(clickPoint, view.frame)) {
//Click is in rect
i = 1;
}
}
//The click wasnt in any of the rects
if (i != 0) {
[super mouseDown:theEvent];
}}
I ended up just subclassing my NSCollectionView, and overriding the - (void)mouseDown:(NSEvent *)theEvent method. I only then sent the method [super mouseDown:theEvent]; if the click was in one of the subviews. Code:
- (void)mouseDown:(NSEvent *)theEvent {
NSPoint clickPoint = [self convertPoint:theEvent.locationInWindow fromView:nil];
int i = 0;
for (NSView *view in self.subviews) {
if (NSPointInRect(clickPoint, view.frame)) {
//Click is in rect
i = 1;
}
}
//The click wasnt in any of the rects
if (i != 0) {
[super mouseDown:theEvent];
}}
I also wanted to avoid empty selection in my collection view.
The way I did it is also by subclassing, but I overrode -hitTest: instead of -mouseDown: to return nil in case the click wasn't on an item :
-(NSView *)hitTest:(NSPoint)aPoint {
// convert aPoint in self coordinate system
NSPoint localPoint = [self convertPoint:aPoint fromView:[self superview]];
// get the item count
NSUInteger itemCount = [[self content] count];
for(NSUInteger itemIndex = 0; itemIndex < itemCount; itemIndex += 1) {
// test the point in each item frame
NSRect itemFrame = [self frameForItemAtIndex:itemIndex];
if(NSPointInRect(localPoint, itemFrame)) {
return [[self itemAtIndex:itemIndex] view];
}
}
// not on an item
return nil;
}
Although I'm late to this thread, I thought I'd just chime in because I've had the same problem recently. I got around it using the following line of code:
[_collectionView setValue:#NO forKey:#"avoidsEmptySelection"];
There is one caveat: the avoidsEmptySelection property is not part of the official API although I think that it's pretty safe to assume that its the type of property that will stick around for a while.
I'm hoping that this question isn't a stupid one but how does one go about positioning a UIPopoverController view over a UIWebView so that the popup view arrow points at the UIWebView link that was clicked to show it?
I'm using the delegate method;
-(BOOL) webView:(UIWebView *)inWeb shouldStartLoadWithRequest:(NSURLRequest *)inRequest navigationType:(UIWebViewNavigationType)inType {
if ( [[[inRequest URL] absoluteString] hasPrefix:#"myscheme:"] ) {
//UIPopoverController stuff here
return NO;
}
}
to capture and route the click but I'm unsure how to get the link coords to position the popup view.
Any help or pointer to relevant info would be very much appreciated.
I have a solution that works but I think there is a better way to do it.
I created a TouchableWebView that inherits from UIWebView and the save the touch position in the method hitTest. After that, you need to set a delegate for your webview and implement the method -webView:shouldStartLoadWithRequest:navigationType:
TouchableWebView.h :
#interface TouchableWebView : UIWebView {
CGPoint lastTouchPosition;
}
#property (nonatomic, assign) CGPoint lastTouchPosition;
TouchableWebView.m :
// I need to retrieve the touch position in order to position the popover
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
self.lastTouchPosition = point;
return [super hitTest:point withEvent:event];
}
In RootViewController.m :
[self.touchableWebView setDelegate:self];
// WebView delegate, when hyperlink clicked
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
if (navigationType == UIWebViewNavigationTypeLinkClicked)
{
CGPoint touchPosition = [self.view convertPoint:self.touchableWebView.lastTouchPosition fromView:self.touchableWebView];
[self displayPopOver:request atPosition:touchPosition isOnCelebrityFrame:FALSE];
return FALSE;
}
return TRUE;
}
It's not good because documentation of UIWebView says that you shouldn't subclass it. I guess there is a nicer way but this does work. Did you find another solution ?
Give each link a unique ID and pass that ID to your Obj-C code via your "myscheme:" logic.
You can then determine the link's left & top offset in the UIWebView via Javascript calls:
NSString *leftJS = [NSString stringWithFormat:#"document.getElementById('%d').offsetLeft - scrollX", linkID];
NSInteger leftOffset = [[currentTextView stringByEvaluatingJavaScriptFromString:js] intValue];
NSString *topJS = [NSString stringWithFormat:#"document.getElementById('%d').offsetTop - scrollY", linkID];
NSInteger topOffset = [[currentTextView stringByEvaluatingJavaScriptFromString:js] intValue];
Subtracting scrollX/scrollY accounts for how much to the left or down the user has scrolled the UIWebView.
My understanding is that offsetLeft and offsetTop return the offsets of the element within its parent. So hopefully your links are at the top of the hierarchy instead of embedded in divs or else determining the offset gets more complicated.
For me, use of getBoundingClientRect() and convert it to CGRect works great.
NSString *js = [NSString stringWithFormat:#"JSON.stringify($(\"a[href='%#']\")[0].getBoundingClientRect())", [inRequest URL]];
// {top:, right:, bottom:, left:, width:, height:}
NSString *rectJson = [webView stringByEvaluatingJavaScriptFromString:js];
NSError *error = nil;
NSDictionary *rectDict = [NSJSONSerialization JSONObjectWithData:[rectJson dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:&error];
if (error) {
NSLog(#"json deserialization failed: %#\n%#", rectJson, error);
}
CGRect rect = CGRectMake([rectDict[#"left"] floatValue], [rectDict[#"top"] floatValue], [rectDict[#"width"] floatValue], [rectDict[#"height"] floatValue]);
I have a notification that fires in my model when certain properties change. As a result, a selector in a particular view object catches the notifications to change the position of the view accordingly.
The notifications causes a view on the window to move in a particular direction (always vertically or horizontally and always by a standard step size on the window). It's possible for the user-actions to cause several notifications to fire one after the other. For example, 3 notifications could be sent to move the view down three steps, then two more notifications could be sent to move the view to the right two steps.
The problem is that as I execute the animations, they don't happen consecutively. So, in the previous example, though I want the view to move slowly down three spaces and then move over two spaces as a result of the notifications, instead it ends up moving diagonally to the new position.
Here is the code for my two selectors (note that placePlayer sets the position of the view according to current information in the model):
- (void)moveEventHandler: (NSNotification *) notification
{
[self placePlayer];
CABasicAnimation* moveAnimation = [CABasicAnimation animationWithKeyPath:#"position"];
moveAnimation.duration = 3;
moveAnimation.fillMode = kCAFillModeForwards; // probably not necessary
moveAnimation.removedOnCompletion = NO; // probably not necessary
[[self layer] addAnimation:moveAnimation forKey:#"animatePosition"];
}
Any suggestions on how to make multiple calls to this methods force animation to execute step-by-step rather than all at once? Thanks!!
I think what you might want to do here is set up a queue of animations that need to happen consecutively and set the animations delegate so that you will receive the animationDidStop:finished: message. This way when one animation is completed you can set off the next one in the queue.
The solution I implemented does indeed use a queue. Here's a pretty complete description:
This is all done in a view class called PlayerView. In the header I include the following:
#import "NSMutableArray+QueueAdditions.h"
#interface PlayerView : UIImageView {
Player* representedPlayer; // The model object represented by the view
NSMutableArray* actionQueue; // An array used as a queue for the actions
bool animatingPlayer; // Notes if the player is in the middle of an animation
bool stoppingAnimation; // Notes if all animations should be stopped (e.g., for re-setting the game)
CGFloat actionDuration; // A convenient way for me to change the duration of all animations
// ... Removed other variables in the class (sound effects, etc) not needed for this example
}
// Notifications
+ (NSString*) AnimationsDidStopNotification;
#property (nonatomic, retain) Player* representedPlayer;
#property (nonatomic, retain, readonly) NSMutableArray* actionQueue;
#property (nonatomic, assign) CGFloat actionDuration;
#property (nonatomic, assign) bool animatingPlayer;
#property (nonatomic, assign) bool stoppingAnimation;
// ... Removed other properties in the class not need for this example
- (void)placePlayer; // puts view where needed (according to the model) without animation
- (void)moveEventHandler:(NSNotification *) notification; // handles events when the player moves
- (void)rotateEventHandler:(NSNotification *) notification; // handles events when the player rotates
// ... Removed other action-related event handles not needed for this example
// These methods actually perform the proper animations
- (void) doMoveAnimation:(CGRect) nextFrame;
- (void) doRotateAnimation:(CGRect)nextFrame inDirection:(enum RotateDirection)rotateDirection;
// ... Removed other action-related methods not needed for this example
// Handles things when each animation stops
- (void) animationDidStop:(NSString*)animationID
finished:(BOOL)finished
context:(void*)context;
// Forces all animations to stop
- (void) stopAnimation;
#end
As an aside, the QueueAdditions category in NSMutableArray+QueueAdditions.h/m looks like this:
#interface NSMutableArray (QueueAdditions)
- (id)popObject;
- (void)pushObject:(id)obj;
#end
#implementation NSMutableArray (QueueAdditions)
- (id)popObject
{
// nil if [self count] == 0
id headObject = [self objectAtIndex:0];
if (headObject != nil) {
[[headObject retain] autorelease]; // so it isn't dealloc'ed on remove
[self removeObjectAtIndex:0];
}
return headObject;
}
- (void)pushObject:(id)obj
{
[self addObject: obj];
}
#end
Next, in the implementation of the PlayerView, I have the following:
#import "PlayerView.h"
#import <QuartzCore/QuartzCore.h>
#implementation PlayerView
#synthesize actionQueue;
#synthesize actionDuration;
#synthesize animatingPlayer;
#synthesize stoppingAnimation;
// ... Removed code not needed for this example (init to set up the view's image, sound effects, actionDuration, etc)
// Name the notification to send when animations stop
+ (NSString*) AnimationsDidStopNotification
{
return #"PlayerViewAnimationsDidStop";
}
// Getter for the representedPlayer property
- (Player*) representedPlayer
{
return representedPlayer;
}
// Setter for the representedPlayer property
- (void)setRepresentedPlayer:(Player *)repPlayer
{
if (representedPlayer != nil)
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[representedPlayer release];
}
if (repPlayer == nil)
{
representedPlayer = nil;
// ... Removed other code not needed in this example
}
else
{
representedPlayer = [repPlayer retain];
if (self.actionQueue == nil)
{
actionQueue = [[NSMutableArray alloc] init];
}
[actionQueue removeAllObjects];
animatingPlayer = NO;
stoppingAnimation = NO;
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:#selector(moveEventHandler:)
name:[Player DidMoveNotification]
object:repPlayer ];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:#selector(rotateEventHandler:)
name:[Player DidRotateNotification]
object:repPlayer ];
// ... Removed other addObserver actions and code not needed in this example
}
}
// ... Removed code not needed for this example
- (void) placePlayer
{
// Example not helped by specific code... just places the player where the model says it should go without animation
}
// Handle the event noting that the player moved
- (void) moveEventHandler: (NSNotification *) notification
{
// Did not provide the getRectForPlayer:onMazeView code--not needed for the example. But this
// determines where the player should be in the model when this notification is captured
CGRect nextFrame = [PlayerView getRectForPlayer:self.representedPlayer onMazeView:self.mazeView];
// If we are in the middle of an animation, put information for the next animation in a dictionary
// and add that dictionary to the action queue.
// If we're not in the middle of an animation, just do the animation
if (animatingPlayer)
{
NSDictionary* actionInfo = [NSDictionary dictionaryWithObjectsAndKeys:
[NSValue valueWithCGRect:nextFrame], #"nextFrame",
#"move", #"actionType",
#"player", #"actionTarget",
nil];
[actionQueue pushObject:actionInfo];
}
else
{
animatingPlayer = YES; // note that we are now doing an animation
[self doMoveAnimation:nextFrame];
}
}
// Handle the event noting that the player rotated
- (void) rotateEventHandler: (NSNotification *) notification
{
// User info in the notification notes the direction of the rotation in a RotateDirection enum
NSDictionary* userInfo = [notification userInfo];
NSNumber* rotateNumber = [userInfo valueForKey:#"rotateDirection"];
// Did not provide the getRectForPlayer:onMazeView code--not needed for the example. But this
// determines where the player should be in the model when this notification is captured
CGRect nextFrame = [PlayerView getRectForPlayer:self.representedPlayer onMazeView:self.mazeView];
if (animatingPlayer)
{
NSDictionary* actionInfo = [NSDictionary dictionaryWithObjectsAndKeys:
[NSValue valueWithCGRect:nextFrame], #"nextFrame",
#"rotate", #"actionType",
rotateNumber, #"rotateDirectionNumber",
#"player", #"actionTarget",
nil];
[actionQueue pushObject:actionInfo];
}
else
{
enum RotateDirection direction = (enum RotateDirection) [rotateNumber intValue];
animatingPlayer = YES;
[self doRotateAnimation:nextFrame inDirection:direction];
}
}
// ... Removed other action event handlers not needed for this example
// Perform the actual animation for the move action
- (void) doMoveAnimation:(CGRect) nextFrame
{
[UIView beginAnimations:#"Move" context:NULL];
[UIView setAnimationDuration:actionDuration];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(animationDidStop:finished:context:)];
self.frame = nextFrame;
[UIView commitAnimations];
}
// Perform the actual animation for the rotate action
- (void) doRotateAnimation:(CGRect)nextFrame inDirection:(enum RotateDirection)rotateDirection
{
int iRot = +1;
if (rotateDirection == CounterClockwise)
{
iRot = -1;
}
[UIView beginAnimations:#"Rotate" context:NULL];
[UIView setAnimationDuration:(3*actionDuration)];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(animationDidStop:finished:context:)];
CGAffineTransform oldTransform = self.transform;
CGAffineTransform transform = CGAffineTransformRotate(oldTransform,(iRot*M_PI/2.0));
self.transform = transform;
self.frame = nextFrame;
[UIView commitAnimations];
}
- (void) animationDidStop:(NSString*)animationID
finished:(BOOL)finished
context:(void *)context
{
// If we're stopping animations, clear the queue, put the player where it needs to go
// and reset stoppingAnimations to NO and note that the player is not animating
if (self.stoppingAnimation)
{
[actionQueue removeAllObjects];
[self placePlayer];
self.stoppingAnimation = NO;
self.animatingPlayer = NO;
}
else if ([actionQueue count] > 0) // there is an action in the queue, execute it
{
NSDictionary* actionInfo = (NSDictionary*)[actionQueue popObject];
NSString* actionTarget = (NSString*)[actionInfo valueForKey:#"actionTarget"];
NSString* actionType = (NSString*)[actionInfo valueForKey:#"actionType"];
// For actions to the player...
if ([actionTarget isEqualToString:#"player"])
{
NSValue* rectValue = (NSValue*)[actionInfo valueForKey:#"nextFrame"];
CGRect nextFrame = [rectValue CGRectValue];
if ([actionType isEqualToString:#"move"])
{
[self doMoveAnimation:nextFrame];
}
else if ([actionType isEqualToString:#"rotate"])
{
NSNumber* rotateNumber = (NSNumber*)[actionInfo valueForKey:#"rotateDirectionNumber"];
enum RotateDirection direction = (enum RotateDirection) [rotateNumber intValue];
[self doRotateAnimation:nextFrame inDirection:direction];
}
// ... Removed code not needed for this example
}
else if ([actionTarget isEqualToString:#"cell"])
{
// ... Removed code not needed for this example
}
}
else // no more actions in the queue, mark the animation as done
{
animatingPlayer = NO;
[[NSNotificationCenter defaultCenter]
postNotificationName:[PlayerView AnimationsDidStopNotification]
object:self
userInfo:[NSDictionary dictionaryWithObjectsAndKeys: nil]];
}
}
// Make animations stop after current animation by setting stopAnimation = YES
- (void) stopAnimation
{
if (self.animatingPlayer)
{
self.stoppingAnimation = YES;
}
}
- (void)dealloc {
if (representedPlayer != nil)
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
[representedPlayer release];
[actionQueue release];
// …Removed other code not needed for example
[super dealloc];
}
#end
Explanation:
The view subscribes to appropriate notifications from the model object (player). When it captures a notification, it checks to see if it is already doing an animation (using the animatingPlayer property). If so, it takes the information from the notification (noting how the player is supposed to be animated), puts that information into a dictionary, and adds that dictionary to the animation queue. If there is no animation currently going, the method will set animatingPlayer to true and call an appropriate do[Whatever]Animation routine.
Each do[Whatever]Animation routine performs the proper animations, setting a setAnimationDidStopSelector to animationDidStop:finished:context:. When each animation finishes, the animationDidStop:finished:context: method (after checking whether all animations should be stopped immediately) will perform the next animation in the queue by pulling the next dictionary out of the queue and interpreting its data in order to call the appropriate do[Whatever]Animation method. If there are no animations in the queue, that routine sets animatingPlayer to NO and posts a notification so other objects can know when the player has appropriately stopped its current run of animations.
That's about it. There may be a simpler method (?) but this worked pretty well for me. Check out my Mazin app in the App Store if you're interested in seeing the actual results.
Thanks.
You should think about providing multiple points along the animation path in an array as shown below.
The example below specifies multiple points along the y-axis but you can also specify a bezier path that you want your animation to follow.
The main difference between basic animation and key-frame animation is that Key-frame allows you to specify multiple points along the path.
CAKeyframeAnimation *downMoveAnimation;
downMoveAnimation = [CAKeyframeAnimation animationWithKeyPath:#"transform.translation.y"];
downMoveAnimation.duration = 12;
downMoveAnimation.repeatCount = 1;
downMoveAnimation.values = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:20],
[NSNumber numberWithFloat:220],
[NSNumber numberWithFloat:290], nil];
downMoveAnimation.keyTimes = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:0],
[NSNumber numberWithFloat:0.5],
[NSNumber numberWithFloat:1.0], nil];
downMoveAnimation.timingFunctions = [NSArray arrayWithObjects:
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn],
// from keyframe 1 to keyframe 2
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut], nil];
// from keyframe 2 to keyframe 3
downMoveAnimation.removedOnCompletion = NO;
downMoveAnimation.fillMode = kCAFillModeForwards;