I want to add CATransition animation for NSView. I have the following code:
[contentView setWantsLayer:YES];
NSRect rect = [contentView bounds];
NSData *shadingBitmapData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"restrictedshine" ofType:@"tiff"]]; // took from Apple's example
NSBitmapImageRep *shadingBitmap = [[[NSBitmapImageRep alloc] initWithData:shadingBitmapData] autorelease];
CIImage *inputShadingImage = [[[CIImage alloc] initWithBitmapImageRep:shadingBitmap] autorelease];
CIFilter *transitionFilter = [CIFilter filterWithName:@"CIRippleTransition"];
[transitionFilter setDefaults];
[transitionFilter setValue:[CIVector vectorWithX:NSMidX(rect) Y:NSMidY(rect)] forKey:@"inputCenter"];
[transitionFilter setValue:[CIVector vectorWithX:rect.origin.x Y:rect.origin.y Z:rect.size.width W:rect.size.height] forKey:@"inputExtent"];
[transitionFilter setValue:inputShadingImage forKey:@"inputShadingImage"];
CATransition *presentAnimation = [CATransition animation];
[presentAnimation setFilter:transitionFilter];
[presentAnimation setDuration:1.0];
[presentAnimation setDelegate:self];
[contentView setAnimations:[NSDictionary dictionaryWithObject:presentAnimation forKey:@"subviews"]];
// maybe there are memory leaks in this code, don't bother at this moment
The problem is:
I execute this code.
I do [[contentView animator] addSubview:mySubview];
for the first time, it does not work. View just appears. CATransition
delegate methods are called, but finished
flag is NO (false).
I remove view by [mySubview removeFromSuperview];
and it removes with animation, finished
flag = YES (true).
I repeat steps 2 and 3 and it works with animation. Step 2 now tells that animation was finished
(YES). Works as expected.
What's wrong?
Problem resolved.
First of all: [contentView setWantsLayer:YES];
, and this must be set before performing animations. Better place for this are awakeFromNib
or init
methods, or something like this. You need to enable Core Animation on contentView
, perform UI drawing (I mean allow your app to do this), and only then perform animations. In my case I enabled Core Animation and performed animation immediately, and that's why it did not work for me.