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Use of @dynamic in objectiveC


Use of @dynamic in objectiveC

By : Torgonton
Date : November 22 2020, 02:42 PM
I wish this helpful for you @dynamic tells the compiler that you, the developer, will make sure that implementations of properties will be added at runtime. There is no hint how you would do this (I suppose it requires playing around with the internals of the Objective-C runtime in objc/runtime.h), and since there is no hint how you do this, you can't use @dynamic in code that you write. Unless you figure it out yourself and post the answer here :-)
NSManagedObject contains @dynamic because its properties are created at runtime by Core Data, and not by the Objective-C compiler. The Objective-C compiler wouldn't know how to create these properties, since they access the database behind the programmer's back.
code :


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2D Dynamic Memory Allocation - ObjectiveC

2D Dynamic Memory Allocation - ObjectiveC


By : Bub B
Date : March 29 2020, 07:55 AM
seems to work fine I need some examples of dynamic memory allocation of 2D array in ObjectiveC in iPhone sdk. Sample code will be appreciated. I want to declare an array of pointers and then each index will be declare an array at runtime. , It is weird to collude C arrays and NSArrays, but it can be done:
code :
NSMutableArray *myArrays[];
myArrays = malloc(sizeof(NSMutableArray *) * numberOfArrays);
NSMutableArray *rows = [NSMutableArray array];
[rows addObject: [NSMutableArray array]];
[rows addObject: [NSMutableArray array]];
[rows addObject: [NSMutableArray array]];

NSMutableArray *row0 = [rows objectAtIndex: 0];
[row0 addObject: [Datum new]];
[row0 addObject: [Datum new]];
[row0 addObject: [Datum new]];
Datum **my2DArray = malloc(sizeof(Datum *) * width * height);
my2DArray[ x + (y * width) ] = ....;
Creating .dylib dynamic library from source files in ObjectiveC

Creating .dylib dynamic library from source files in ObjectiveC


By : user2598620
Date : March 29 2020, 07:55 AM
I hope this helps . See Apple's developer docs
or just follow the instructions from the page you quote
ObjectiveC: if (obj) {...} AND if (obj != nil) {...}, which is better?

ObjectiveC: if (obj) {...} AND if (obj != nil) {...}, which is better?


By : 53vi
Date : March 29 2020, 07:55 AM
Any of those help edit: after testing a bit, I have determined that modern compilers will actually create the same machine code for both cases;
orig post:
code :
if(obj) {
Map with int key in objectiveC

Map with int key in objectiveC


By : Im a Lonely Pig
Date : March 29 2020, 07:55 AM
wish of those help The best option (if you don't want to mess with C++) is using a NSMutableDictionary with NSNumbers as keys. This is easier with the new literal syntax:
code :
NSMutableDictionary *map = [NSMutableDictionary dictionary];
map[@1] = @"A value";
map[@578] = @"Another string";
int key = 310; // doesn't matter where this comes from
map[@(key)] = @"From a variable!";
MVC as used in ObjectiveC programming

MVC as used in ObjectiveC programming


By : user3876662
Date : March 29 2020, 07:55 AM
it should still fix some issue A model is what holds your application's data — its model of the world.
A view is what interfaces with your user. It displays things and receives input back.
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