I want to fire some code when a property is accessed and changed. I use @property... and @synthesze... in my code for my ivars. The properties are retained, so I'd like to keep that memory management stuff automatically generated by @synthesize. However, I assume that @synthesize tells the compiler to generate the accessor methods code ...
Anyone knows if iPhone OS is based on 32-bit or 64-bit architecture? ...
I wonder if this affects performance or memory consumption a lot. I need an NSMutableArray, and at the beginning I can only guess how many objects will be added. About 3 to 5 maybe. So I create it like this: NSMutableArray *arr = [[NSMutableArray alloc] initWithCapacity:3]; What happens here exactly, when creating it with a capacity o...
I am customizing my UIButton and I can either set image or background image. They both work fine but how do I decide which one to use? Are these two methods for when people have image that are broken up into foreground and background so they can layer them? ...
I would like to get your recommendation on what settings to use for audio recording using AVAudioRecorder. Below is the settings I am using currently. Also, what file extension should I save it as so users on Mac or Windows can play it without difficulties? Right now I am saving the file out as .caf [settings setValue:[NSNumber n...
Example: I add some NSString objects to an NSMutableArray: @"Foo", @"Bar", @“FooBar". Now somewhere else I access that array again, and I want to delete @"Foo". So I create a new NSString @"Foo", and pass it to -removeObject:. The documentation does not state on what criteria -removeObject works. I think that it looks only for the memory...
Or: How to expand the sensitive area for a UIControl without just making the view bigger? I have a pretty small button image (a little arrow), which is just 10 x 10 pixels. Too small for touching. I want the "hot area" to be 50 x 50 around that. For learning, I want to know how to do it manually, even if I could use some of the provided...
I have a UIControl (or UIView, could have either of them, doesnt matter), and this is covered by another UIControl. The other UIControl reacts nicely on touches. But the underlying UIControl also needs to know about the touch and if the touch was actually "on it" or not (from the user's perspective). The covering UIControl is partially t...
That's tricky. I have a small button over a very big one. When the small button on that big button is pressed, the small button does something. But the big one does nothing. Of course. But now I want that the big button also does something, no matter if the small button was tapped or not. So the small button has to forward all touch even...
I have a UIImage that is UIImageOrientationUp (portrait) that I would like to rotate counter-clockwise by 90 degrees (to landscape). I don't want to use a CGAffineTransform. I want the pixels of the UIImage to actually shift position. I am using a block of code (shown below) originally intended to resize a UIImage to do this. I set a tar...
I have an animation which I kick off like this: [UIView beginAnimations:@"doThis" context:self]; [UIView setAnimationDuration:1.5f]; [UIView setAnimationDelay:2.5f]; Now, the problem is that this animation is told to start in 2.5 seconds. But in the meantime, something may happen and I don't want the animation anymore. However, CA wil...
when a UIView is rotated, it's borders look incredible ugly. There's no antialiasing happening at all. Also if it's a UIImageView, no antialiasing happens when rotating the transform matrix. Is there a way to achieve smooth edges and smooth rotation of images? ...
Due to the lazy loading nature of view controllers in iPhone, my app is a bit slow in response the first time when you go to the various screens, which has a rich graphics elements (custom graphics assets) in it. Will preloading the app images ahead of time, that is, by calling [UIImage imageNamed: ...] ahead of time so the next time it...
In my app, I would like to resize the tableview's height when it's in edit mode vs when it's not (in order to make room for editing controls below the table view) How should this be done? ...
The documentation is very poor on this. What's the effect of these? The only thing that seems to work as expected is kCAAnimationLinear. What can I do with the others, for example? ...
Hi, I have an UIView which I want to give a gradient background and I'm wondering how to implement that as efficient as possible. I am considering three options: Create an UIImageView as subview and give it an image of the gradient to display. Draw the gradient image in drawRect: of the original UIView. Draw the gradient in drawRect:...
I am getting errors of type EXC-BAD-ACCESS where I create a new UIImage instance by assigning the value of a pre-existing UIImage (as below) and I am trying to figure out what the problem is. There is a heap of code to sort through and I am not sure where to start so I won't bother posting source -- but it might help me in my investigati...
I want to compare if an variable A represents the same object as variable B does. Could I do that with the == operator? Or what else is this exactly looking at? I think I need to check for the memory adress of the object where the variable is pointing to, right? ...
Apple has added Spotlight to OS3.0 release. I am having problem finding any API for third party apps to work with Spotlight Search. Is such a thing available? ...
Example: I have a float value like 1294322.0000000, and I want to print it out in a label, like that: 1.294.322 So at every thousands-position one point inbetween. I bet you know what I mean. Don't know the exact english words for that. Or, for example, I have a float like that: 15.29, then it should look like "15,29". Or a float li...