It seems that the UIView has not methods like "didRemoveFromSuperview" or "willRemoveFromSuperview".Then,How to listen to the event when a UIView removed from its superView?I should use KVO? thanks in advance! ...
As far as I know, it's a pointer to the superclass. It's hard-wired with the superclass, and not dynamically figured out at runtime. Would like to know it more in detail... Anyone? ...
In Java type arguments, does mean strictly subtypes only? or would E also suffice? ...
How do I choose a particular a method call in the inheritance chain? class A def boo; puts "A:Boo"; end end class B < A def boo; super; puts "B:Boo"; end end class C < B def boo; self.A.boo(???); puts "C:Boo"; end end Thus the output would be A:Boo, C:Boo TIA, -daniel ...
Let's say I have a form for adding/editing products (with field 'user' being a foreign key to my User) triggered from two separate view functions - add/edit : def product_add(request): userprofile = UserProfile.objects.get(user=request.user) if request.method == 'POST': form = ProductAddForm(request.POST, request.FILES,)...
As the title says, how do you remember the order of super's arguments? Is there a mnemonic somewhere I've missed? After years of Python programming, I still have to look it up :( (for the record, it's super(Type, self)) ...
Hi, the above explanation is very nice. However, I am slightly confused by the implementation of Decorator Pattern (DeP) as given in http://www.netobjectives.com/resources/books/design-patterns-explained/java-code-examples/chapter17/#17-1 The design for above linked code is given at tinypic.com/view.php?pic=xnaqlt&s=3 I am confused...
I got an unexpected closure when creating a nested class. I suspect that this is something related to metaclasses, super, or both. It is definitely related to how closures get created. I am using python2.7. Here are five simplified examples that demonstrate the same problem that I am seeing (they all build off the first): EXAMPLE ...
Let's say I have a base class named Entity. In that class, I have a static method to retrieve the class name: class Entity { public static String getClass() { return Entity.class.getClass(); } } Now I have another class extend that. class User extends Entity { } I want to get the class name of User: System.out.pri...
I want to create a namedtuple which represents the individual flags in a short bitfield. I'm trying to subclass it so that I can unpack the bitfield before the tuple is created. However, my current attempt isn't working: class Status(collections.namedtuple("Status", "started checking start_after_check checked error paused queued loade...
Long Ascii String Text may or may not be crushed and compressed into hash kind of ascii "checksum" by using sophisticated mathematical formula/algo. Just like air which can be compressed. To compress megabytes of ascii text into a 128 or so bytes, by shuffling, then mixing new "patterns" of single "bytes" turn by turn from the first to t...
Is super() used to call the parent constructor? Please explain super(). ...
I'm trying to call a method of the superclass by using a variable method name. Normally, I would see the following two lines of code as equivalent: someObj.method() someObj.__getattribute__( 'method' )() And in fact I believe, this is also what actually happens when I use the first line. However, in the following example, the second l...
Hi, Given is the following code: function two() { return "success"; } function one() { two(); return "fail"; } If you test the code by calling function one(), you will always get "fail". The question is, how can I return "success" in function one() by only calling function two()? Is that even possible? Regards ...
Is it possible to access the super class method of an objects super class (or grandfather)? For instance: GrandFatherObject : NSObject SuperObject : GrandFatherObject SelfObject : SuperObject From SelfObject: - (void)overriddenMethod { // For Self someCode(); // For Parent [super overriddenMethod]; // For GrandParent ?...
Hello! I wonder why in these examples there is always a [super someMethod] inside of the Method that has the exact same name: - (void)viewDidLoad { [super viewDidLoad]; // some code } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } - (void)viewDidUnload { [super viewDidUnload]; } I know that t...
Is there a construct in Java or C# that forces inheriting classes to call the base implementation? You can call super() or base() but is it possible to have it throw a compile-time error if it isn't called? That would be very convenient.. --edit-- I am mainly curious about overriding methods. ...
I have an edit page for my object. Because I've divided data in two tabs, I'm using jquery-ui. On the first tab (#core_data) I'm loading object's main data. Form is submited via Ajax : <form method="post" class="object_form" id="event-core-form" action="{% url edit_event_data event.id %}" enctype="multipart/form-data"> {{ form.as_p ...