that any of the properties it exports are KV observable.
I would recommend you use a different method to observe changes in the
transform.
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of the filters you used
to generate that CIImage to the layer. In the case you outline however, there
is no advantage to be had – just assign the CGImageRef to the CALayer's
contents and you are likely to be as optimal as possible.
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determine if it is a portrait or landscape view by comparing width height in
many cases.
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orientation, us
the interfaceOrientation property on your view controller.
That said, why layout that way at all? Why not base your layout on the views
bounds instead?
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On Jun 26, 2011, at 11:39 AM, Tales Pinheiro de Andrade tal...@me.com wrote:
Hi.
I have a few
that you are actually changing. @contents is a bit special
because it is typically set outside of your control, but other properties tend
no to be.
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don't do it in -dealloc also, you can still have a
case where you get a delegate callback, but have an incomplete UI (depending on
what you are doing it may not crash, but you would then not see the results
either).
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at that point.
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?
I've got the random noise part working and it easily fast enough. Its a shame
there isn't a way to specify the opacity when drawing CGLayers. I'd find that
useful but I imagine there is a reason for it.
CGContextSetAlpha().
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to you to then follow the lifetime of that object to discover why it
was leaked.
The method at hand looks good, so it is most likely that the caller or one of
its callers has failed to correctly manage the memory.
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as the
one on your desktop machine).
It may make more sense to take this from a different angle, for example why do
you need a bitmap context in the first place and why does it need to be larger?
There may be better ways of handling this case.
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antialiasing however.
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masks in a particular way.
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CGContextAddLineToPoint(context,pointB.x, pointB.y); //draw to this point
// and now draw the Path!
CGContextStrokePath(context);
What is pointA pointB? What is self.strokeColor? Assuming this is happening
within -drawRect:, it should work just fine.
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On Jun 6, 2011, at 2:37 PM, David Duncan wrote:
On Jun 6, 2011, at 2:31 PM, Development wrote:
I'm really loosing faith in my ability to read simple english
According to like a million examples... If I place the follow bit of code
in a view's drawRect: method I should get a line
with a single path. Instead I would recommend you use another
MKOverlay to designate the end of the path.
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the timer if you
do) then you cancel the connection attempt and declare that the connection
timed out. No need for additional connections.
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On Jun 2, 2011, at 11:16 AM, Nathan Sims wrote:
On Jun 2, 2011, at 10:36 AM, David Duncan wrote:
On Jun 2, 2011, at 10:31 AM, Jim Adams wrote:
Why? Because the timeout was inordinately long with no way to shorten it
other than create my own timeout. Users want responsiveness. One
which steps you through a simple iOS application.
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orientation callbacks (see the documentation for
details) or by implementing -layoutSubviews on relevant views in your view
hierarchy.
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report would be good here.
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by taking a view from one view
controller and adding it as a subview to a view owned (directly or indirectly)
by another view controller?
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and relatively rare. The only
reason I could reasonably debug the issue like this was because I had control
over the sequence of numbers that I was seeing.
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restriction like that however. That said, as you
point out, if you have view that supports layers and come from a nib, you often
have to duplicate work to allow it to work in both situations.
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On May 17, 2011, at 9:49 AM, Bill Cheeseman wrote:
On May 17, 2011, at 11:33 AM, David Duncan wrote:
There should be no actual restriction like that however. That said, as you
point out, if you have view that supports layers and come from a nib, you
often have to duplicate work to allow
cannot easily (if at all) replicate.
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you get one your memory usage will
keep growing and growing.
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QuartzCore.framework.
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the comparison to NO after the comparison to YES,
because it cannot guarantee that the value you are comparing against isn't a
value other than YES or NO in most cases.
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On May 4, 2011, at 4:50 AM, Brian Bruinewoud wrote:
Question is: Why doesn't the Nothing button animate in all calls to the
method?
Only thing I can think of is self.nothingButton == nil.
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(spoiler alert: what you
are doing is not supported). If you want to be able to load arbitrary views
from nibs to add to a view managed by a view controller, the recommendation is
to use an NSObject subclass to own the view and UINib to load the nib.
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above.
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of is that you are using different compilers that are optimizing
differently *and* that you are using Garbage Collection (which you allude to
when you set various values to nil). But if you aren't using GC, then I have no
idea (and setting the values to nil has no effect either).
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and repeats indefinitely, which
would likely give you the same effect without having to run a timer at all.
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it, it can either be a complex or fun game to
see what you can do with animations to get an effect by itself )
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same thing with
UIViews and use UILabel for your labels (which since they do less work for text
layout are generally faster).
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would ideally somehow be embedded within the
circle objects so they could track together. Would it make sense to have a
parallel CATextLayer associated with each CALayer in my circle object? Or
does CAShapeLayer have that capability?
From: David Duncan david.dun...@apple.com
To: Jon
you need to do this:
- (SomeObjectType) foo
{
dispatch_once(ivar_predicate, ^ { ivar_value = /* initialization */ });
return ivar_value;
}
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. If the flag is true, it does nothing. What makes dispatch_once
useful over a simple if statement is that it ensures that if you execute
dispatch_once concurrently from multiple threads that flag gets updated exactly
once, and the block gets called exactly once.
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On Apr 14, 2011, at 10:26 AM, WT wrote:
On Apr 14, 2011, at 2:09 PM, David Duncan wrote:
On Apr 14, 2011, at 10:02 AM, WT wrote:
I looked at dispatch_once() at one point, but I'm still confused by how it
works.
dispatch_once uses a predicate (just a flag) to determine if it should run
impact
system performance.
Can anyone tell me what's causing this ? It's screwing up some of the child
views and causing some subtle bugs...
Your -viewDidUnload method is either directly or indirectly causing the view to
reload, typically by referencing it via self.view.
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by making OpenGL work with AVPlayerLayer. What
are you trying to do?™
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is). If
setting the bounds fixes that, then that is the likely cause.
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open that PDF in Preview.app it looks the same, all jpeg
images are inverted (looks like a film negative). Anybody have a idea on what
is causing this and how to work around it? Thanks Dean
Are these JPEG's perhaps CMYK? Either way you should file a bug report.
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to know for certain)
Basically a CAEAGLLayer is a cross-over point from Core Animation to OpenGL.
Other Core Animation content doesn't interact with the content of a CAEAGLLayer
anymore than the content of any single CALayer interacts with the content of
any other.
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and then just create an
NSWindow on whatever screens you want. You probably want a borderless window
(which is a flag you can pass when you create the window) so that the window
doesn't have content by default.
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without applicationWillTerminate seems kind of
rude :(
Is there any reason you can't save your state once you enter the background
instead?
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that relies on filename, it is probably best
to use arbitrary file names and use whatever the user gives you as a document
title instead.
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that the auto
rotation methods are called in and what has happened at each step.
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a process which creates lots of
objects that are otherwise short lived, but your particular case doesn't have
that, since all of these objects end up being referenced, directly or
indirectly, via the 'list' object.
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with this project).
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of why? in this, but I think the answer is that
you should use the various control events that are exposed for
-addTarget:action:forControlEvents:. By doing so you can get action messages
for basically every touch interaction without needing to subclass to forward
messages.
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Is the contentsScale property set correctly? For CALayers it defaults to 1.0,
UIKit ensures that it is set correctly for layers that it creates, but it is
your responsibility to do this for layers that you create yourself.
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On Jul 11, 2010, at 4:03 PM, Carter Allen cocoa
animation.
This is probably a better alternative.
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in this case it is necessary to understand why you want to do this, as
it is highly likely to inform the approach that you should use. As an example,
removing all Unicode characters from a string would invalidate characters such
as ä, and which could change meanings or identifications.
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likely to look bad than one
that is significantly smaller if only because the resampling will distort the
image more.
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you nave needsDisplayOnBoundsChanged=YES, I would recommend you
set it to NO, and call -setNeedsDisplay on your layers manually when the
resizing is done.
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are trying to figure out your memory usage, it is better to use the
VM Tracker instrument (part of the Allocations template). You'll have to turn
on automatic sampling or press the sample button yourself to get data, but
watching the Dirty Size statistic is what you are interested in here.
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and may offer some memory usage benefits (if you can use
subviews).
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investigated this pathway in the past.
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.
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runloop
iteration? If so, there was no from to animate from, so there is no animation.
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(such as setting auto
sizing text).
Since it sounds like you want the redraw behavior, I would probably just make
that change in IB and go from there.
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.
Technically scrolling is a geometry change, since it is accomplished by
changing the layer's bounds.origin (basically the change is coming from Core
Animation). If your layout is expensive, it is likely that you will need to
maintain a separate layout is dirty flag to avoid this.
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(to make a 1 pixel border) will
likely give you the effect that you desire, although at the cost of additional
rendering time since your layers will no longer be opaque.
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look as good as text drawn over a background.
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larger layer as I mentioned, using the very same APIs that you
mentioned :).
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like layout metrics
(which is above Quartz) and so the question there might be what is Cocoa Text
doing differently (which is beyond my knowledge). The first and second look
like identical metrics with the issue I pointed out (sub-pixel on vs off).
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**)? The type cast doesn't change the data, just the compiler's
interpretation of it (and since this is a pointer that won't affect the data
itself in anyway).
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with something that demonstrates the behavior.
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the view's are resized on one
runloop invocation and their contents replaced on the next. Instead of
overriding -setFrame: you should override -layoutSubViews: which should catch
more cases where layout is needed and allow you to do the work you need at the
right time.
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views (and thus
archived along with those views).
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to test?
You seem to be assuming that NSLog calls -localizedStringWithFormat:, you
probably want to try calling it yourself and logging the results instead.
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not
certain this could be done cleanly or without using lots of intermediate paths
for even short sequences. It is something to explore.
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: with that context, then create an image
from the context and assign it to the layer's contents property. It isn't a
generally useful technique, but if you have a case where you want to preserve
previous content when redrawing the layer this is one way to do so.
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] == [dict valueForKey:obj2] is also true.
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something
}
Only if [[NSNumber numberWithInt:8760] isEqual:@8760] which I don't believe
to be the case.
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is tall without breaking out a ruler to determine if they are the same length.
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On Jan 6, 2011, at 2:51 PM, James Bucanek wrote:
David Duncan mailto:david.dun...@apple.com wrote (Thursday, January 6, 2011
11:53 AM -0800):
On Jan 6, 2011, at 10:28 AM, James Bucanek wrote:
So how can I get my text to draw as smoothly as the Finder?
Subpixel antialiasing requires
, and as such developer
provided dylibs are useless.
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and are based upon those functions.
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On Dec 23, 2010, at 1:09 PM, FF wrote:
On 2010-12-23, at 12:56 PM, David Duncan wrote:
On Dec 23, 2010, at 5:58 AM, FF wrote:
I copied this example from Apple docs.
Generally the examples are there to show you how to use an API, not
necessarily to be complete standalone code. You
);
CGContextTranslateCTM(context, 0, CGImageGetHeight(bc_itemImage));
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawImage(context, self.bounds, bc_itemImage);
CGContextRestoreGState(context);
}
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, but a
dead end that will fail for anything but the simplest of scenes.
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-backed view
appkit views
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'self-foo' is equivalent to 'foo' (both are transformed into an appropriate
offset into instance storage). self.foo is equivalent to [self foo] or [self
setFoo:] depending on context.
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, but the size of the MPMediaPickerController view's
is in portrait mode always.
As noted in the documentation, the media picker doesn't support landscape mode.
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CATiledLayer being drawn to via drawRect:
with UIKit.
So what's true? And how can I find out precisely what is and isn't
thread-safe? m.
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the compiler is just trying to help you understand the ramifications
of your code, just like the warning for if (x = y). You can take the advice
or leave it.
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the frame, are not the same, and well the docs clearly says its
undefined.
Check the bounds, it contains the untransformed size of the view.
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on the view the
frame is a much less reliable means of making adjustments to the view.
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the
debugger to check your deltas.
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is not the case above).
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// stuff
@end
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of typing code into Mail instead of a compiler
:).
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it was a mutable object that wouldn't have been
modified anyway.
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:
Error: FT_Open_Face failed: error 2.
for some files as well when I call CGContextDrawPDFPage on some PDF files.
Once again, is there a way to pre-flight the PDFs to determine if they are
going to fail?
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, I tried the quad curve.
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, you may or may not need OpenGL. You
can experiment with using a CADisplayLink to update a view/layer hierarchy and
see if that gets what you need.
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