Fwd: CAAnimation working with float, but not with int?
Fwd: CAAnimation working with float, but not with int?
- Subject: Fwd: CAAnimation working with float, but not with int?
- From: Bill Dudney <email@hidden>
- Date: Tue, 15 Jan 2008 13:23:06 -0700
Hi Kevin,
Short answer is interpolating between 1 and 2 with an int wont work.
There is nothing between 1 and 2 with an int. The CA machinery that
does the animation will only interpolate (and thus animate) types that
it knows how to interpolate. Conceptually it could work if you were to
scale the range up to say 1000 to 2000 and then set the from and to
values accordingly but AFAIK the CA machinery will still refuse to do
the interpolation.
HTH,
-bd-
http://bill.dudney.net/roller/objc
On Jan 15, 2008, at 11:24 AM, Kevin Barnes wrote:
I'm creating a view and animating an instance variable of that
view. If the instance variable is a float, everything works
perfectly, but if I change the float to an int, the animation
doesn't happen. It appears that the "animationWithKeyPath" function
doesn't even get called if my ivar is an int.
Can anyone tell me why my code doesn't work?
Class cls = objc_allocateClassPair([NSView class],
"AnimatedView", 0);
class_addIvar(cls, "animValue", sizeof(int), log2(sizeof(int)),
"i");
Method setterImpl = class_getClassMethod([MyView class],
@selector(setAnimValue:));
class_addMethod(cls, @selector(setAnimValue:),
method_getImplementation(setterImpl), "v@:i");
objc_registerClassPair(cls);
NSView *av = class_createInstance(cls, 0);
[av init];
CABasicAnimation *anim = [CABasicAnimation
animationWithKeyPath:@"animValue"];
[anim setFromValue:[NSNumber numberWithInt:0]];
NSDictionary *dic = [NSDictionary dictionaryWithObject:anim
forKey:@"animValue"];
[av setAnimations:dic];
[self addSubview:av];
objc_msgSend([av animator], @selector(setAnimValue:), (int)100);
Implementation of setAnimValue:
+(void)setAnimValue:(int) val {
printf("setAnimValue val=%d\n", val);
}
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