macOS Objective-C

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Objective-C

Let daarop dat programme wat in Objective-C geskryf is behou hul klasverklarings wanneer gecompileer word in Mach-O binaries. Sulke klasverklarings sluit die naam en tipe van:

Die klas
Die klas metodes
Die klas instansie veranderlikes

Jy kan hierdie inligting verkry deur class-dump:

class-dump Kindle.app

Let daarop dat hierdie name obfuskeer kan word om die omkering van die binêre meer moeilik te maak.

Klasse, Metodes & Objekte

Koppelvlak, Eienskappe & Metodes

// Declare the interface of the class
@interface MyVehicle : NSObject

// Declare the properties
@property NSString *vehicleType;
@property int numberOfWheels;

// Declare the methods
- (void)startEngine;
- (void)addWheels:(int)value;

@end

Klas

@implementation MyVehicle : NSObject

// No need to indicate the properties, only define methods

- (void)startEngine {
NSLog(@"Engine started");
}

- (void)addWheels:(int)value {
self.numberOfWheels += value;
}

@end

Object & Call Method

Om 'n instansie van 'n klas te skep, word die alloc metode aangeroep wat geheue toewys vir elke eienskap en nul daardie toewysings. Dan word init aangeroep, wat die eienskappe tot die vereiste waardes initaliseer.

// Something like this:
MyVehicle *newVehicle = [[MyVehicle alloc] init];

// Which is usually expressed as:
MyVehicle *newVehicle = [MyVehicle new];

// To call a method
// [myClassInstance nameOfTheMethodFirstParam:param1 secondParam:param2]
[newVehicle addWheels:4];

Klas Metodes

Klas metodes word gedefinieer met die plusteken (+) en nie die koppelteken (-) wat met instansiemetodes gebruik word nie. Soos die NSString klas metode stringWithString:

+ (id)stringWithString:(NSString *)aString;

Setter & Getter

Om te stel & te kry eienskappe, kan jy dit doen met 'n puntnotasie of soos asof jy 'n metode aanroep:

// Set
newVehicle.numberOfWheels = 2;
[newVehicle setNumberOfWheels:3];

// Get
NSLog(@"Number of wheels: %i", newVehicle.numberOfWheels);
NSLog(@"Number of wheels: %i", [newVehicle numberOfWheels]);

Instansie Veranderlikes

Alternatiewelik tot setter & getter metodes kan jy instansie veranderlikes gebruik. Hierdie veranderlikes het dieselfde naam as die eienskappe, maar begin met 'n "_":

- (void)makeLongTruck {
_numberOfWheels = +10000;
NSLog(@"Number of wheels: %i", self.numberOfLeaves);
}

Protokolle

Protokolle is 'n stel metodeverklarings (sonder eienskappe). 'n Klas wat 'n protokol implementeer, implementeer die verklaarde metodes.

Daar is 2 tipes metodes: verpligtend en opsioneel. Deur default is 'n metode verpligtend (maar jy kan dit ook met 'n @required etiket aandui). Om aan te dui dat 'n metode opsioneel is, gebruik @optional.

@protocol myNewProtocol
- (void) method1; //mandatory
@required
- (void) method2; //mandatory
@optional
- (void) method3; //optional
@end

Alles saam

// gcc -framework Foundation test_obj.m -o test_obj
#import <Foundation/Foundation.h>

@protocol myVehicleProtocol
- (void) startEngine; //mandatory
@required
- (void) addWheels:(int)value; //mandatory
@optional
- (void) makeLongTruck; //optional
@end

@interface MyVehicle : NSObject <myVehicleProtocol>

@property int numberOfWheels;

- (void)startEngine;
- (void)addWheels:(int)value;
- (void)makeLongTruck;

@end

@implementation MyVehicle : NSObject

- (void)startEngine {
NSLog(@"Engine started");
}

- (void)addWheels:(int)value {
self.numberOfWheels += value;
}

- (void)makeLongTruck {
_numberOfWheels = +10000;
NSLog(@"Number of wheels: %i", self.numberOfWheels);
}

@end

int main() {
MyVehicle* mySuperCar = [MyVehicle new];
[mySuperCar startEngine];
mySuperCar.numberOfWheels = 4;
NSLog(@"Number of wheels: %i", mySuperCar.numberOfWheels);
[mySuperCar setNumberOfWheels:3];
NSLog(@"Number of wheels: %i", mySuperCar.numberOfWheels);
[mySuperCar makeLongTruck];
}

Basiese Klasse

String

// NSString
NSString *bookTitle = @"The Catcher in the Rye";
NSString *bookAuthor = [[NSString alloc] initWithCString:"J.D. Salinger" encoding:NSUTF8StringEncoding];
NSString *bookPublicationYear = [NSString stringWithCString:"1951" encoding:NSUTF8StringEncoding];

Basiese klasse is onveranderlik, so om 'n string aan 'n bestaande een toe te voeg, moet 'n nuwe NSString geskep word.

NSString *bookDescription = [NSString stringWithFormat:@"%@ by %@ was published in %@", bookTitle, bookAuthor, bookPublicationYear];

Of jy kan ook 'n mutable string klas gebruik:

NSMutableString *mutableString = [NSMutableString stringWithString:@"The book "];
[mutableString appendString:bookTitle];
[mutableString appendString:@" was written by "];
[mutableString appendString:bookAuthor];
[mutableString appendString:@" and published in "];
[mutableString appendString:bookPublicationYear];

Nommer

// character literals.
NSNumber *theLetterZ = @'Z'; // equivalent to [NSNumber numberWithChar:'Z']

// integral literals.
NSNumber *fortyTwo = @42; // equivalent to [NSNumber numberWithInt:42]
NSNumber *fortyTwoUnsigned = @42U; // equivalent to [NSNumber numberWithUnsignedInt:42U]
NSNumber *fortyTwoLong = @42L; // equivalent to [NSNumber numberWithLong:42L]
NSNumber *fortyTwoLongLong = @42LL; // equivalent to [NSNumber numberWithLongLong:42LL]

// floating point literals.
NSNumber *piFloat = @3.141592654F; // equivalent to [NSNumber numberWithFloat:3.141592654F]
NSNumber *piDouble = @3.1415926535; // equivalent to [NSNumber numberWithDouble:3.1415926535]

// BOOL literals.
NSNumber *yesNumber = @YES; // equivalent to [NSNumber numberWithBool:YES]
NSNumber *noNumber = @NO; // equivalent to [NSNumber numberWithBool:NO]

Blokke

Blokke is funksies wat as objekte optree sodat hulle aan funksies oorgedra kan word of gestoor kan word in arrays of woordeboeke. Ook, hulle kan 'n waarde verteenwoordig as hulle waardes gegee word so dit is soortgelyk aan lambdas.

returnType (^blockName)(argumentType1, argumentType2, ...) = ^(argumentType1 param1, argumentType2 param2, ...){
//Perform operations here
};

// For example

int (^suma)(int, int) = ^(int a, int b){
return a+b;
};
NSLog(@"3+4 = %d", suma(3,4));

Dit is ook moontlik om 'n bloktipe te definieer wat as 'n parameter in funksies gebruik kan word:

// Define the block type
typedef void (^callbackLogger)(void);

// Create a bloack with the block type
callbackLogger myLogger = ^{
NSLog(@"%@", @"This is my block");
};

// Use it inside a function as a param
void genericLogger(callbackLogger blockParam) {
NSLog(@"%@", @"This is my function");
blockParam();
}
genericLogger(myLogger);

// Call it inline
genericLogger(^{
NSLog(@"%@", @"This is my second block");
});

Lêers

// Manager to manage files
NSFileManager *fileManager = [NSFileManager defaultManager];

// Check if file exists:
if ([fileManager fileExistsAtPath:@"/path/to/file.txt" ] == YES) {
NSLog (@"File exists");
}

// copy files
if ([fileManager copyItemAtPath: @"/path/to/file1.txt" toPath: @"/path/to/file2.txt" error:nil] == YES) {
NSLog (@"Copy successful");
}

// Check if the content of 2 files match
if ([fileManager contentsEqualAtPath:@"/path/to/file1.txt" andPath:@"/path/to/file2.txt"] == YES) {
NSLog (@"File contents match");
}

// Delete file
if ([fileManager removeItemAtPath:@"/path/to/file1.txt" error:nil]) {
NSLog(@"Removed successfully");
}

Dit is ook moontlik om lêers te bestuur met NSURL-objekte in plaas van NSString-objekte. Die metode name is soortgelyk, maar met URL in plaas van Path.


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