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2014/10/15 ¤U¤È 10:04:04
iphone Programming Glossary: assignmentObjective-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 improve this question If you're just accessing them there's not much reason to use self.member . If you're doing assignment it's good if you're doing more than the simple @property assign parameter for instance retain copy etc so it can save on..
Boundry detect paper sheet opencv http://stackoverflow.com/questions/13493035/boundry-detect-paper-sheet-opencv a real copy of the actual data and operate on this copy. The OpenCV reference states by using a copy constructor or assignment operator where on the right side it can be a matrix or expression see below. Again as noted in the introduction matrix assignment.. operator where on the right side it can be a matrix or expression see below. Again as noted in the introduction matrix assignment is O 1 operation because it only copies the header and increases the reference counter. Mat clone method can be used to..
if (self = [super init]) vs. if ((self = [super init])) http://stackoverflow.com/questions/3059232/if-self-super-init-vs-if-self-super-init operation . Thus self nil would actually be TRUE. I thought if self super init checks what is the value of self after assignment value of variable . Thus self nil would be FALSE. Which one is the correct way to use when initializing your own classes.. same thing. The thing that the if evaluates is the value of the expression inside it which is the assigned value in an assignment. So when self is not nil you proceed into the if block. The second form throws parens around it to silence any potential.. proceed into the if block. The second form throws parens around it to silence any potential compiler warnings about assignments inside conditionals which is generally bad practice and possibly a typo. But this is idiomatic Objective C so it's fine..
didFinishPickingMediaWithInfo return nil photo http://stackoverflow.com/questions/3088874/didfinishpickingmediawithinfo-return-nil-photo image myUIImageView.image info objectForKey UIImagePickerControllerOriginalImage AND no doing some other kind of assignment UIImage myImage info objectForKey UIImagePickerControllerEditedImage picker dismissModalViewControllerAnimated YES picker..
Programmatically creating Views in IOS (how does it work)? http://stackoverflow.com/questions/4820094/programmatically-creating-views-in-ios-how-does-it-work Views in IOS how does it work A little background I'm going through the CS193P iTune videos and I was stuck on the assignment 3 for the longest time. Basically the assignment asks you to programmatically create a custom view to display a shape on.. I'm going through the CS193P iTune videos and I was stuck on the assignment 3 for the longest time. Basically the assignment asks you to programmatically create a custom view to display a shape on the screen. I'm not using any view controllers by..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers of the resources I'm using is Stanford's CS193P class notes that they have left on the web. It includes lecture notes assignments and sample code and since the course was given by Apple dev's I definitely consider it to be from the horse's mouth . Class.. the horse's mouth . Class Website http www.stanford.edu class cs193p cgi bin index.php Lecture 08 is related to an assignment to build a UINavigationController based app that has multiple UIViewControllers pushed onto the UINavigationController stack...
How to gain assignment access to CGRect elements when the CGRect is an instance variable http://stackoverflow.com/questions/5860755/how-to-gain-assignment-access-to-cgrect-elements-when-the-cgrect-is-an-instance to gain assignment access to CGRect elements when the CGRect is an instance variable @interface some_class some_parent @property nonatomic.. . OK I get that. Can I tell it to not create a setter so that I can access the member variable directly and make assignments to the struct members without having to assign the entire CGRect I suppose that I could break this out into four individual.. The opposite does not seem to be the case as you just can't reach into an ivar that happens to be a struct and make an assignment to one of its elements without having to assign the entire struct. I also tried this @interface some_class some_parent @public..
NSString @property, using copy instead of retain http://stackoverflow.com/questions/587414/nsstring-property-using-copy-instead-of-retain of operations here is important the new value 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..
Why does this create a memory leak (iPhone)? http://stackoverflow.com/questions/612986/why-does-this-create-a-memory-leak-iphone as @property retain id editMyObject id may be replaced by a more specific type or @property copy id editMyObject then assignment via self.editMyObject retains or copies the assigned object. Since MyObject alloc init returns a retained object that you..
How to convert NSData to byte array in iPhone? http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone length Byte byteData len byteData data bytes But the last line of code pops up an error saying incompatible types in assignment . What is the correct way to convert the data to byte array then iphone objective c bytearray type conversion share improve..
Embed Google Maps on page without overriding iPhone scroll behavior http://stackoverflow.com/questions/7534888/embed-google-maps-on-page-without-overriding-iphone-scroll-behavior user must have been setting the events variable somewhere outside the presented code since it looks like the matching assignment is for touch events and the else assignment is for key events. But since I didn't have an events variable it was defaulting.. somewhere outside the presented code since it looks like the matching assignment is for touch events and the else assignment is for key events. But since I didn't have an events variable it was defaulting to the wrong assignment. I simply changed.. and the else assignment is for key events. But since I didn't have an events variable it was defaulting to the wrong assignment. I simply changed mine to start e.touches 0 .pageY and did the same for the touchend event and now everything works. However..
How can I compile lame as static library(.a) for armv6 and armv7 of iPhone? http://stackoverflow.com/questions/9207063/how-can-i-compile-lame-as-static-library-a-for-armv6-and-armv7-of-iphone In function ˜get_termcap_string console.c 92 warning implicit declaration of function ˜tgetstr console.c 92 warning assignment makes pointer from integer without a cast console.c In function ˜get_termcap_number console.c 102 warning implicit declaration..
iPhone: Bonjour NSNetService IP address and port http://stackoverflow.com/questions/938521/iphone-bonjour-nsnetservice-ip-address-and-port app can only handle v4 addresses but ideally you should be prepared to pass both address families upstream. The port assignment will generate incorrect values for Intel processors. You need to use htons to fix that. As Andrew noted above the iteration..
Static string variable in Objective C on iphone http://stackoverflow.com/questions/980083/static-string-variable-in-objective-c-on-iphone in class B as str @ NewValue . This value persists for all methods in class B. But if I access it in class C after assignment in B I am getting it as OldValue. Am I missing something Should i use extern in other classes Thanks Regards Yogini iphone..
http://stackoverflow.com/questions/986392/programmatically-force-a-uiscrollview-to-stop-scrolling-for-sharing-a-table-vie i.e. decelerating the table view continues to decelerate from the old offset effectively overriding my contentOffset assignment. Is there a way to force the table view to stop scrolling decelerating when I set the contentOffset or another way to make..
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