nsobject

I have a class object like; BookEntity.h import <Cocoa/Cocoa.h> @interface BookEntity : NSObject<NSCoding> { NSString *name; NSString *surname; NSString *email; } @property(copy) NSString *name,*surname,*email; @end BookEntity.m #import "BookEntity.h" @implementation BookEntity @synthesize name,surname,email; - (void) encodeWithCoder: (NSCoder *)coder { [coder encodeObject: self forKey:@"appEntity"]; } - (id) initWithCoder: (NSCoder *)coder { if (self = [super init]) { self = [coder decodeObjectForKey:@"appEntity"]; } return self; } and I assign some values to this class, BookEntity *entity =

If I have an NSObject subclass which either has no -init method or simply does nothing in -init , is there any difference between an instance created these two ways: MyClass *instance = [MyClass alloc]; MyClass *instance = [[MyClass alloc] init]; By "does nothing in -init " I mean - (id)init { self = [super init]; if (self) { } return self; } Since NSObject 's -init method itself does nothing, I can't see there being any difference, but of course the advice is that you must call -init to properly prepare an object. Here's the snippet from NSObject 's -init method which got me wondering about

The following Swift code generates a compile error at build time: import Foundation class Wrapper<T> : NSObject { let obj : T init(x : T) { self.obj = x } } Am I doing something wrong or is this a compiler bug? If so, what could I do to work around it? The error log: CompileSwift normal i386 com.apple.xcode.tools.swift.compiler cd /Users/hermespique/workspace/HanekeSwift export PATH="/Applications/Xcode6-Beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode6-Beta.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Applications/Xcode6

I have a People class which holds various bits of into about a person. I would like to be able to identify what kind of person this is, so I thought I would try using a typedef enum for this since I have seen it done before and it seems like the cleanest solution. But, I am unsure how to declare this, then make it into a property. .h typedef enum { kPersonTypeFaculty, kPersonTypeStaff, kPersonTypeSearch } personType; @interface Person : NSObject { NSString *nameFirst; NSString *nameLast; NSString *email; NSString *phone; NSString *room; NSString *status; NSString *building; NSString

This question already has answers here : Closed 3 years ago . NSObject subclass in Swift: hash vs hashValue, isEqual vs == (2 answers) The FooBar class below has to override the == function of the Equatable type. However, calling contains on an array of FooBar objects does not cause a breakpoint inside the custom == function to get invoked. Is it possible another == function is overriding this custom one? Note: Because FooBar must subclass from NSCoding and NSObject, FooBar does not list Equatable as a protocol because it causes this error: Redundant conformance of 'FooBar' to protocol

I often do something like: CoolViewController *coolViewController = [[CoolViewController alloc] init]; [self.navigationController pushViewController:coolViewController animated:YES]; [coolViewController release]; How would I, in a category of UINavigationController , override forwardInvocation: so that I could just instead do: [self.navigationController pushCoolViewControllerAnimated:YES]; Please include the relevant code in your answer, not just an explanation. Thank you! Feel free to comment on whether this is good practice. I'm also asking this for educational purposes, but it seems to me

原文链接： https://mikeash.com/pyblog/friday-qa-2013-10-25-nsobject-the-class-and-the-protocol.html Reader Tomas Bouda asks: what's the deal with the NSObject protocol? There are two NSObjects in Cocoa, a class and a protocol. Why both? What purpose do they serve? In today's article, I'll explore the answer to this question. 读者Tomas Bouda问我：“NSObject协议应该怎么理解呢？在Cocoa中有两处NSObject，一处是NSObject类，另一处是NSObject协议。为啥会有两个呢？他们到底有什么作用？”。在今天的文章里，我将会探讨这个问题。 Namespaces 命名空间 First, let's look at how these two entities with the same name can coexist. Classes and protocols in Objective-C inhabit entirely separate