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2014/10/15 ¤U¤È 10:04:04
iphone Programming Glossary: assignediphone Core Data Unresolved error while saving http://stackoverflow.com/questions/1283960/iphone-core-data-unresolved-error-while-saving times iphone objective c ios core data share improve this question It means there's a mandatory property has been assigned nil. Either in your .xcodatamodel check the optional box or when you are saving to the managedObjectContext make sure that..
UIViewController. viewDidLoad vs. viewWillAppear: What is the proper division of labor? http://stackoverflow.com/questions/1579550/uiviewcontroller-viewdidload-vs-viewwillappear-what-is-the-proper-division-of What is the proper division of labor I have always been a bit unclear on the type of tasks that should be assigned to viewDidLoad vs. viewWillAppear in a UIViewController subclass. For example I am doing an app where I have a UIViewController..
CGImage/UIImage lazily loading on UI thread causes stutter http://stackoverflow.com/questions/1815476/cgimage-uiimage-lazily-loading-on-ui-thread-causes-stutter from left to right. Code runs on the UI thread to ensure that newly visible UIImageViews have a freshly loaded UIImage assigned to them. The loading happens on a background thread. Everything works almost fine except there is a stutter as each image..
iPhone - What are reuseIdentifiers (UITableViewCell)? http://stackoverflow.com/questions/2152180/iphone-what-are-reuseidentifiers-uitableviewcell creates with the intent to reuse it as the basis for performance reasons for multiple rows of a table view. It is assigned to the cell object in initWithFrame reuseIdentifier and cannot be changed thereafter. A UITableView object maintains a queue..
@property and retain, assign, copy, nonatomic in Objective-C http://stackoverflow.com/questions/2255861/property-and-retain-assign-copy-nonatomic-in-objective-c vs. copy vs. assign assign is the default. In the setter that is created by @synthesize the value will simply be assigned to the attribute. My understanding is that assign should be used for non pointer attributes. retain is needed when the attribute..
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self .applicationFrame window addSubview mainViewController view window makeKeyAndVisible When mainViewController is assigned to aController the self keyword is specified self.mainViewController aController However when the mainViewController 's..
How do I query the iPhone's current IP address? http://stackoverflow.com/questions/260484/how-do-i-query-the-iphones-current-ip-address url and do some string manipulation to retrieve the IP address. If you want the internal IP address the one assigned e.g. by DHCP to your device what you can usually do is to resolve the device's hostname i.e. Returns the local IP or NULL..
Managing multiple asynchronous NSURLConnection connections http://stackoverflow.com/questions/332276/managing-multiple-asynchronous-nsurlconnection-connections self The problem with asynchronous requests is when you have various requests going off and you have a delegate assigned to treat them all as one entity a lot of branching and ugly code begins to formulate going What kind of data are we getting..
Deleting an app in iTunes Connect http://stackoverflow.com/questions/3377534/deleting-an-app-in-itunes-connect on the Deselect all button to uncheck all App Store territories. Click on the Save Changes button. After removing all assigned territory checkboxes from your app in the Rights and Pricing section the status changes to Developer Removed from Sale and..
Bonjour over bluetooth WITHOUT Gamekit ? http://stackoverflow.com/questions/3844189/bonjour-over-bluetooth-without-gamekit When writing a server you may even want to first listen on port 0 zero and then query which random available port was assigned to you. After querying for that announce this port instead of a fixed one. That's exactly what WiTap example is doing but..
How to make a call programmatically? http://stackoverflow.com/questions/4582327/how-to-make-a-call-programmatically improve this question Keep the phone number in a separate string. NSString phoneNumber @ 1 800 555 1212 dynamically assigned NSString phoneURLString NSString stringWithFormat @ tel @ phoneNumber NSURL phoneURL NSURL URLWithString phoneURLString..
iPhone - UIImagePickerControllerDelegate inheritance http://stackoverflow.com/questions/4727895/iphone-uiimagepickercontrollerdelegate-inheritance UIImagePickerControllerDelegate inheritance I have added a UIImagePickerController to a UIViewController. I have assigned the UIImagePickerControllerDelegate to that UIViewController. When I try to do myPicker.delegate self Xcode gifts me with..
Comparing float and double data types in objective C http://stackoverflow.com/questions/5024913/comparing-float-and-double-data-types-in-objective-c double or float data type in an iPhone app I am running into problems with and comparisons because when a variable is assigned a number entered with one decimal place such as 4.2 the float or double used in the comparison actually may have a value.. I avoid this problem iphone objective c c floating point double share improve this question when a variable is assigned a number entered with one decimal place such as 4.2 the float or double used in the comparison actually may have a value..
NSString @property, using copy instead of retain http://stackoverflow.com/questions/587414/nsstring-property-using-copy-instead-of-retain must be retained copied before the old value is released in case of self assignment. If you released first and then assigned the property to itself you might deallocate the value by accident. Also note that if the old value is nil sending it a release..
What is objc_setAssociatedObject() and in what cases should it be used? http://stackoverflow.com/questions/5909412/what-is-objc-setassociatedobject-and-in-what-cases-should-it-be-used must be unique. A typical pattern is to use a static variable. The policy specifies whether the associated object is assigned retained or copied and whether the association is be made atomically or non atomically. This pattern is similar to that..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c objective c cocoa delegates share improve this question An Objective C delegate is just an object that has been assigned as a delegate of another. There's no special process for creating them you simply define a class that implements the delegate..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown but it may be dangerous. I've seen Clang go through a few iterations of how it handles return values that aren't assigned to local variables. There's no reason that with ARC enabled that it can't retain and release the object value that's returned..
http://stackoverflow.com/questions/8146253/animate-change-of-view-controllers-without-using-navigation-controller-stack-su below only works for portait orientation I made the following assumptions for this example You have a view controller assigned as the rootViewController of your window When you switch to a new view you want to replace the current viewController with..
Is there a way to simulate multiple iphones using xcode/iphone sim? http://stackoverflow.com/questions/896487/is-there-a-way-to-simulate-multiple-iphones-using-xcode-iphone-sim multiple instances of the debugger running either. This means to do multi device apps you'll need to have a single Mac assigned to a single iPhone touch device or simulator instance each running your app. I've started looking into whether VMWare or..
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