greypoint - Developer IT

Strategy to lazy load images for buttons within UIScrollView?

- by greypoint

I have a horizontal UIScrollView that contains UIButtons (though it could be any object). I would like to only download images for these buttons as the user scrolls and they are seen. I would also like an activityindicator running on each button while the images are downloading. Here's what I've tried with results: Check content offset of uiscrollview and download images for visible buttons. Problem: issues getting activity view shown within subclassed UIButton and not desired usability since images are only downloaded once scrolling stops. Add subviews (not buttons) to the UIScrollview hoping to use the view's ViewController to initiate a downloaded on viewDidAppear. Problem: viewDidAppear never seems to get called (because I am using addSubView?). I've seen other apps that do this kind of loading but need some guidance on the typical set-up. Ebay's app is a great example. All items have a default image until the item comes into view, then an activityindicator runs and the items unique image is downloaded. Thanks for assistance.

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iPhone/Cocoa Coding Standards

- by greypoint

Are there any generally-accepted coding standards (naming, casting etc) that apply specifically to iPhone/Cocoa/Objective-C? I know Microsoft has published similar standards as they relate to .Net and C# but haven't run across anything related to the iPhone world.

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Can UIDatePicker's minimumDate and maximumDate include time?

- by greypoint

Need a UIDatePicker with specific maximum and minimum dates and times. Currently NSDatePicker.minimumDate and .maximumDate appear to only consider the date. What's the proper way to handle this?

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Simplest means to fade/dissolve between two UIImageViews

- by greypoint

Could someone give me a little direction on creating crossfades/dissolves between two UIImageViews in the same view controller? I am trying to set up an effect of a background image slideshow but not sure on the mechanics. Thanks.

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Why would XCode not include a resource in device build vs simulator

- by greypoint

I have an issue where an image resource (Default.png) is included in a build for the simulator but is not being included when built for device. I have verified this by looking at the *.app package contents? I have also verified that the resource is selected for the active target. Any thoughts on what else I can look at to debug this? Thanks.

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Can keyboard of type UIKeyboardTypeNamePhonePad be made to start in phone mode?

- by greypoint

Is there some way to have a keyboard of type UIKeyboardTypeNamePhonePad start in phone number pad mode rather than alphabetic? The keyboard works well for what I need but I'd like it to start in the "other" mode since that is more likely what the user will enter.

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Compile/use unrar C++ source for iphone app?

- by greypoint

Writing an app that will include the ability to decompress zip and rar files. I think I'm OK on how to handle the .zips but .rars seem a little more trouble. I noticed that rarlabs has source available but it's C++. Is there a way to compile, wrap or otherwise use this code within an iPhone app? Reference: http://www.rarlab.com/rar_add.htm Open to alternate suggestions on how to handle .rar files as well. I'm still pretty much a newbie so please explain in small words :)

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Same project...multiple apps?

- by greypoint

We have a an iPhone app project that we wish to deploy multiple times under different client names. The individual apps will be very similar but will have different resources (icon, images etc) and config settings stored in plists (server names, options etc). What is the preferred means to manage this in Xcode? Obviously we really don't want different XCode projects for each App deployment since it's 90% shared code.

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Why does initWithFrame have the wrong frame value?

- by greypoint

I have a subclass of UIButton called INMenuCard and I am overriding the initWithFrame to include an activity indicator. The menuCard places correctly but any internal reference to "frame" give me "inf,inf,0,0" which means my activityIndicator subview is not placed correctly. What might I be missing? @implementation INMenuCard - (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { CGRect innerFrame = CGRectInset(frame, 50.0f, 100.0f); activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:innerFrame]; activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhite; [self addSubview:activityIndicator]; } return self; } I am instantiating INMenuCard with (debugging shows the CGRect values are correct): CGRect cardFrame = CGRectMake(cardX, cardStartY, cardWidth, cardHeight); INMenuCard *menuCard = [[INMenuCard buttonWithType:UIButtonTypeCustom] initWithFrame:cardFrame]; [theView addSubView:menuCard];

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How would I include open source library in my iPhone application?

- by greypoint

I have found an existing open source library that I would like to include in my iPhone project (the unrar source code found here: http://www.rarlab.com/rar_add.htm ). I have compiled this source as a linked library on my Mac with "make lib" which creates the libunrar.so file just fine. These are the makefile settings for that target: lib: WHAT=RARDLL lib: $(OBJECTS) $(LIB_OBJ) @rm -f libunrar.so $(LINK) -shared -o libunrar.so $(LDFLAGS) $(OBJECTS) $(LIB_OBJ) Obviously I can't use this on iPhone but I imagine I should be able to compile with different options to make a static library that I can use. Do I: Compile it on the Mac with different make options then drag the resulting library (some kind of .a ?) into my xcode project? or Drag all of the source code into my xcode project and create special targets of some kind to create it? or Something else entirely different? I've been working on solving my unrar problem for a couple of weeks now and I believe using this library will give me the best results but I just don't know the final steps to make use of it. Thanks for all advice.

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