¡@
2014/10/15 ¤U¤È 10:12:15
iphone Programming Glossary: object'sOptimizing CLLocationManager/CoreLocation to retrieve data points faster on the iPhone http://stackoverflow.com/questions/1081219/optimizing-cllocationmanager-corelocation-to-retrieve-data-points-faster-on-the have one location manager running there's only one GPS chip in the iPhone thus if you launch multiple location manager object's they'll conflict and you get errors from the GPS location manager stating it can't update. 2 Be extremely careful how you..
Objective-C 101 (retain vs assign) NSString http://stackoverflow.com/questions/1380338/objective-c-101-retain-vs-assign-nsstring this question There's no such thing as the scope of an object in Objective C. Scope rules have nothing to do with an object's lifetime the retain count is everything. You usually need to claim ownership of your instance variables. See the Objective..
Compensating compass lag with the gyroscope on iPhone 4 http://stackoverflow.com/questions/4212988/compensating-compass-lag-with-the-gyroscope-on-iphone-4 I get the CMAttitude object. Correct me if I'm wrong please but here is what I've deduced from the CMAttitude object's yaw property I don't need pitch nor roll for my purposes yaw ranges from 0 to PI when the phone is pointing downwards as..
Tracking variable or memory change in XCode? http://stackoverflow.com/questions/4801175/tracking-variable-or-memory-change-in-xcode or memory change in xcode The one like in visual studio called 'data breakpoint'. I want to know where changes my object's view frame. I want to set a breakpoint at a member variable and run it. Then I could get where it's been changed. Thanks..
Just two rounded corners? [duplicate] http://stackoverflow.com/questions/4845211/just-two-rounded-corners
What is the use of -[NSUserDefaults registerDefaults:]? http://stackoverflow.com/questions/4931167/what-is-the-use-of-nsuserdefaults-registerdefaults
Repeating NSTimer, weak reference, owning reference or iVar? http://stackoverflow.com/questions/4945028/repeating-nstimer-weak-reference-owning-reference-or-ivar The deal breaker is what the target of the timer is If the object that creates a timer is its target managing that object's lifetime becomes more fragile it cannot simply be retain release managed instead you need to ensure that the client that..
Where can I find a good example of a Core Data to-many relationship? http://stackoverflow.com/questions/5399195/where-can-i-find-a-good-example-of-a-core-data-to-many-relationship forKey @ theTime newTime setValue existingParent forKey @ parent Note that if you set the relationship from the Time object's side you can use setValue ForKey because from the Time object's perspective the relationship is just one object to one object... Note that if you set the relationship from the Time object's side you can use setValue ForKey because from the Time object's perspective the relationship is just one object to one object. It is really quite simple once you start thinking in objects..
What are the key concepts for an iPhone Developer to learn? [closed] http://stackoverflow.com/questions/5677655/what-are-the-key-concepts-for-an-iphone-developer-to-learn you should know about. Coding Patterns Key Value Observing KVO Allowing one object to respond to changes of another object's properties by registering the Observer with the target object. For more on KVO see Apple's Key Value Observing Programming..
NSString @property, using copy instead of retain http://stackoverflow.com/questions/587414/nsstring-property-using-copy-instead-of-retain is explicitly allowed and does nothing. The choice of retaining versus copying just determines whether or not the object's property shares the same value with what you're setting it to. Consider the following code suppose the 'foo' property is..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c go of it and its reference count is decremented. If after calling release the reference count is now zero then that object's memory is freed by the system. The basic way this differs from malloc and free is that any given object doesn't need to.. on to an object for some length of time if it's a member variable in a class for instance then I need to make sure the object's reference count knows about me. As described above an object's reference count is incremented by calling retain . By convention.. in a class for instance then I need to make sure the object's reference count knows about me. As described above an object's reference count is incremented by calling retain . By convention it is also incremented set to 1 really when the object..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature @ @ en_US_POSIX2.description en_US_POSIX2 localeIdentifier self setLocale en_US_POSIX2 NSLog @ Category's object @ and object's locale @ @ self.description self.locale.description self.locale localeIdentifier return self @end Basically just changed.. 0x160550 en_US_POSIX 2011 07 15 16 35 24.338 DemoApp 214 307 Category's object NSDateFormatter 0x160d90 and object's locale __NSCFLocale 0x12be70 en_GB 2011 07 15 16 35 24.345 DemoApp 214 307 dateString 2011 07 15 04 35 24 PM 2011 07 15..
Last In-First Out Stack with GCD? http://stackoverflow.com/questions/7567827/last-in-first-out-stack-with-gcd cell UITableViewCell alloc initWithStyle UITableViewCellStyleDefault reuseIdentifier CellIdentifier If the contact object's image has not been loaded Use a place holder image then use dispatch_async on a background queue to retrieve it. if contact.image..
Moving a Stick figure, anchorpoints, animation, or something else…? http://stackoverflow.com/questions/7808981/moving-a-stick-figure-anchorpoints-animation-or-something-else game object. The image size has changed so it no longer fits naturally into the game's graphics. On the other hand the object's position has already been well established through gameplay testing and should not be changed to avoid re testing the game...
Why is object not dealloc'ed when using ARC + NSZombieEnabled http://stackoverflow.com/questions/8408071/why-is-object-not-dealloced-when-using-arc-nszombieenabled to do with ARC. NSZombieEnabled basically swizzles dealloc for an implementation which in turn isa swizzles that object's type to _NSZombie a dummy class that blows up as soon as you send any message to it. This is expected behavior and if I'm..
Crash when using gesture recognizers in StoryBoard http://stackoverflow.com/questions/9035826/crash-when-using-gesture-recognizers-in-storyboard object which is the same as the description for most classes . On the simulator you can ask the debugger to print the object's debugDescription like this gdb frame 0 #0 0x013bcbff in NSObject doesNotRecognizeSelector gdb po int ebp 2 this is my test..
|