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Are there any repositories around for open sourced iPhone and iPad components?

I've noticed that there are many questions about how to handle UIImage objects, especially in conjunction with UIImagePickerController and then displaying it in a view (usually a UIImageView ). Here is a collection of common questions and their answers. Feel free to edit and add your own.

I want to migrate my iPhone app to a new database version. Since I don't have some version saved, I need to check if certain column names exist.

I am having a hard time consuming a very simple (Hello World) WCF web service in my iPhone app. From what I have read, you must manually create the request message then send it to the web service URL.

I have a UIButton , that when pressed, brings up a new view where the user can change some settings. When the view is dismissed, I'd like to update the title/text of the UIButton to reflect the new state. I'm calling:

I have an app that has a tab bar & nav bar for normal interaction. One of my screens is a large portion of text, so I allow the user to tap to go full screen (sort of like Photos.app).

I have some 50 custom cells in my UITableView. I want to display an

I have a UITextView included in a UITableViewCell . The layout is correct when the views are initially displayed, but once I click in the UITextView it automatically scrolls up a bit and the top half of the characters on the first line becomes invisible.

I have a mySample.app file - an iPhone application developed by xcode.

I want to set the height of the first header in my UITableView. For the other headers I want them to remain the default height. What value/constant can I put in place of "someDefaultHeight" in the code below?

I would like to add some rounded corners to all of the UIImageViews in my project. I have already got the code working, but am having to apply it to every image; should I subclass UIImageView to add this? If so, can someone give me some pointers as to how to do this?

i'm using the iphone sdk (3.0) and i'm trying to create an array of selectors to invoke a variety of methods within one class.

Hey all. I'm still pretty new to iPhone development, and I'm having a bit of trouble figuring out how to change the title of my Navigation Bar. On another question on this site somebody recommended using :

If I put only an image in a button and set the imageEdgeInsets more close to the top, the image stays centered and all works as expected:

I am attempting to get a UIGestureRecognizer working with a UIWebview which is a subview of a UIScrollView. This sounds odd but when I have the numberOfTouchesRequired set to 2 the selector fires, but when numberOfTouchesRequired is set to one the selector doesn't fire.

Is it possible to position an element fixed relative to the viewport in Mobile Safari? As many have noted, position: fixed doesn't work, but Gmail just came out with a solution that almost is what I want – see the floating menu bar on the message view.

I've heard that you need to get a Mac if you want to develop iPhone apps. Is this true?

Hallo experts, I've tested what's happing with my app when the iPhone is switched off while the app is active. For this purpose I logged the callback methods of the app's lifecycle in the xcode debugger console.

I read in another post that you can submit the app without the binary but I based on what I have seen this is no longer possible. It seems you cannot submit without the binary and the binary is submitted through the application loader. Is there any other known way to get the itunes/app store link to my app before I submit the binary?

I want to know if there is a way to restrict the size or movements of the UIViews in the GestureRecognizers. Sure I could write my own restriction code but wana know if we can set some property or something to have some bound limits.