2014/10/15 下午 10:05:26

iphone Programming Glossary: confusion

NSManagedObjectContext performBlockAndWait: doesn't execute on background thread?

http://stackoverflow.com/questions/11831946/nsmanagedobjectcontext-performblockandwait-doesnt-execute-on-background-thread

synchronized with everything submitted to the queue . I hope that makes sense though it probably just caused more confusion. EDIT Furthermore you can see the unspoken implications of this in that the way in which performBlockAndWait provides re..

Where's the difference between setObject:forKey: and setValue:forKey: in NSMutableDictionary?

http://stackoverflow.com/questions/1249634/wheres-the-difference-between-setobjectforkey-and-setvalueforkey-in-nsmutab

more generic e.g. any key type . It's somewhat of a coincidence that the signatures are so similar. What adds to the confusion is that NSMutableDictionary's implementation of setValue forKey is equivalent to setObject forKey in most cases. In other..

Declaration/definition of variables locations in ObjectiveC?

http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec

readability Thanks a bunch folks iphone objective c ios ios5 share improve this question I can understand your confusion. Especially since recent updates to Xcode and the new LLVM compiler changed the way ivars and properties can be declared...

Objective-C: When to call self.myObject vs just calling myObject

http://stackoverflow.com/questions/1332389/objective-c-when-to-call-self-myobject-vs-just-calling-myobject

C When to call self.myObject vs just calling myObject This little bit of syntax has been a bit of a confusion for me in Objective C. When should I call self.myObject vs just calling myObject It seems redundant however they are not..

MKAnnotationView fault when zoom in/out changed the pin image

http://stackoverflow.com/questions/13745211/mkannotationview-fault-when-zoom-in-out-changed-the-pin-image

to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and why?)

http://stackoverflow.com/questions/14659563/to-drawrect-or-not-to-drawrect-when-should-one-use-drawrect-core-graphics-vs-su

any profiling. Consider that I'm comfortable with both methods and now really want a deeper understanding. A lot of my confusion comes from learning how to make table view scroll performance really smooth and fast. Of course the original source of this..

Detect backspace in UITextField

http://stackoverflow.com/questions/1977934/detect-backspace-in-uitextfield

function is called but still not when I press the backspace key in an empty field. Any ideas There seems to be some confusion around this question. I want to receive a notification when the backspace key is pressed. That's it. But the solution must..

MFMailComposeViewController image orientation

http://stackoverflow.com/questions/20204495/mfmailcomposeviewcontroller-image-orientation

the image as it is physically laid out as 3264x2448 i.e. landscape. In debugging this I ran into an additional confusion. And that is that the orientation property can be stripped from the UIImage if you make a copy of it incorrectly. This code..

What exactly must I do in viewDidUnload?

http://stackoverflow.com/questions/2261972/what-exactly-must-i-do-in-viewdidunload

stays in memory. And dealloc is for the case where the whole thing goes to trash. Maybe someone can clear up the confusion. iphone memory management share improve this question The intent here is to balance out your subview management. Anything..

Getting “Using two-stage rotation animation” warning with UIImagePickerController

http://stackoverflow.com/questions/2878947/getting-using-two-stage-rotation-animation-warning-with-uiimagepickercontrolle

within another UIViewController . Because it isn't pushed like a UINavigationController stack there is confusion at the UIWindow level. I don't know if the warning is a problem but to eliminate the warning you can do the following self..

iPhone Landscape FAQ and Solutions

http://stackoverflow.com/questions/2953351/iphone-landscape-faq-and-solutions

Landscape FAQ and Solutions There has been a lot of confusion and a set of corresponding set of questions here on SO how iPhone applications with proper handling for Landscape Portrait..

Dismissing UIAlertViews when entering background state

http://stackoverflow.com/questions/3105974/dismissing-uialertviews-when-entering-background-state

recommends dismissing any UIAlertViews UIActionSheets when entering background state in iOS 4. This is to avoid any confusion on the user's part when he relaunches the application later. I wonder how I could elegantly dismiss all UIAlertViews at..

How do I launch my settings bundle from my application?

http://stackoverflow.com/questions/335965/how-do-i-launch-my-settings-bundle-from-my-application

preferences. Providing the same set of preferences in your application might require too many screens and might cause confusion for the user. When your application has only a few options or has options that the user might want to change regularly you..

dealloc, use release or set to nil for properties?

http://stackoverflow.com/questions/4124049/dealloc-use-release-or-set-to-nil-for-properties

use release or set to nil for properties I have noticed a little confusion when looking at various bits of code both in books and on the web when it comes to implementing dealloc. My question is..

What determines the presence of the iPhone Location Services icon in the status bar?

http://stackoverflow.com/questions/4413963/what-determines-the-presence-of-the-iphone-location-services-icon-in-the-status

I want to be sure that the icon is displayed only when Location Services are actually being employed by my app. Enter confusion. We as developers do not get access to the status bar via the official SDK. This means that the OS will display that icon..

been having a little confusion about the retainCount of NSURLConnection

http://stackoverflow.com/questions/5220902/been-having-a-little-confusion-about-the-retaincount-of-nsurlconnection

having a little confusion about the retainCount of NSURLConnection first look at these code NSURL url NSURL alloc initWithString @ lasdhfkjasf NSURLRequest..

facebook-ios-sdk logout question

http://stackoverflow.com/questions/6226950/facebook-ios-sdk-logout-question

find a solution for simple 'login' 'logout' operations using it. Looks like the Single Sign On style is causing more confusion than benefits. I'd like to know if it is possible have the following situation Enter in the app no accessToken expirationDate..

Quartz 2D drawRect method (iPhone)

http://stackoverflow.com/questions/716351/quartz-2d-drawrect-method-iphone

joconor and Hector Ramos's answers below are contradicting each other. And that's a good demonstration of my confusion concerning this subject. iphone ios cocoa touch quartz graphics share improve this question Some of the confusion between.. confusion concerning this subject. iphone ios cocoa touch quartz graphics share improve this question Some of the confusion between various Cocoa references comes from the introduction of layer backed views in Leopard. On the iPhone all UIViews..

Does storyboard eliminate the need for .nib

http://stackoverflow.com/questions/8495179/does-storyboard-eliminate-the-need-for-nib