1 . Which security protocol or measure would provide the greatest protection for a wireless LAN? WPA2 cloaking SSIDs shared WEP key MAC address filtering 2 . Refer to the exhibit. All trunk links are operational and all VLANs are allowed on all trunk links. An ARP request is sent by computer 5. Which device or devices will receive this message? only computer 4 computer 3 and RTR-A computer 4 and RTR-A computer 1, computer 2, computer 4, and RTR-A computer 1, computer 2, computer 3, computer 4, and RTR-A all of the computers and the router 3 . Refer to the exhibit. Hosts A and B, connected to hub HB1, attempt to transmit a frame at the same time but a collision occurs. Which hosts will receive the collision jamming signal? only hosts A and B only hosts A, B, and C only hosts A, B, C, and D only hosts A, B, C, and E 4 . Refer to the exhibit. Router RA receives a packet with a source address of 192.168.1.65 and a destination address of 192.168.1.161...
Yes, it's possible (only in the latest Core Animation releases though, I believe, i.e. iPhone 3.0+ and OS X 10.6+).
ReplyDeleteMake your property dynamic so that CA implements the accessors for you:
@dynamic myInt;
Tell the layer that changes of the property require redrawing:
+ (BOOL)needsDisplayForKey:(NSString*)key {
if ([key isEqualToString:@"myInt"]) {
return YES;
} else {
return [super needsDisplayForKey:key];
}
}
Use the value of myInt in your drawInContext: method. Now, when you animate myInt, Core Animation will interpolate the values for each step of the animation and repeatedly ask the layer to draw itself.
If you also want to enable implicit animations for this property, also override actionForKey:.
There is a way to retain the iVars of your custom CALayer subclasses. You override initWithLayer:, the method which is called to create a copy of custom layers. For example, if you have a layer in which you want to create a custom property called 'angle', you might use the following code:
ReplyDelete@implementation AngledLayer
@synthesize angle = _angle
// Tell Core Animation that this key should be animated
+ (BOOL) needsDisplayForKey:(NSString *)key
{
if ([key isEqualToString:@"angle"]) return YES;
return [super needsDisplayForKey:key];
}
// Make sure that, when the layer is copied, so is the custom ivar
- (id) initWithLayer:(id)layer
{
self = [super initWithLayer:layer];
if (self) {
AngledLayer *angledVersion = (AngledLayer *)layer;
self.angle = angledVersion.angle;
}
return self;
}
And bob's your uncle! Note that you can't use this object with implicit animation, for which you'd also have to overide the actionForKey: method.