ios nsagora #3: objective-c vs. swift

Tuesday 29 July, meeting #3

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70

23 Members

Objective-C vs. Swift

alexcristea!iOS Dev

January 9

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1951

2007

2008 #42

2014 #3

Modern.Safe.Fast.Fun

2014 #16

DISCLAIMER

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vs

Language

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Data  Types

Objective  C Swift

NSInteger Int

double Double

BOOL Bool

NSString String

NSArray Array

id AnyObject

Class AnyClass

SEL Selector

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Define  new  Data  Types

Objective  C Swift

@interface class

@protocol protocol

struct struct

enum enum

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Extending  existing  Data  Types

Objective  C Swift

categories extension

@interface (categoryName) @end

class a{ } extension a { }

struct b { } extension b{ }

enum b { } extension b{ }

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#if __LP64__typedef long NSInteger;typedef unsigned long NSUInteger;#elsetypedef int NSInteger;typedef unsigned int NSUInteger;#endif!#define NSIntegerMax LONG_MAX#define NSIntegerMin LONG_MIN#define NSUIntegerMax ULONG_MAX

Objective-C

Data type definitions

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struct Int : SignedInteger { init() init(_ value: Int) .... static var max: Int { get } static var min: Int { get } } !extension Int : Printable { var description: String { get } }

Swift

Data type definitions

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@property (nonatomic) NSMutableArray *items;@property (nonatomic, strong) NSArray *immutableItems;@property (nonatomic, weak) id<DelegateProtocol> delegate;

Objective-C

var items:Array<Int> = [] let immutableItems = [1, 2, 3, 4] weak var delegate:DelegateProtocol?

Swift

Properties

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@property (nonatomic) DataProcessor *processor;....

- (DataProcessor *)getDataProcessor { if(!_processor) { _processor = [DataProcessor alloc] init]; } return _processor; }

Objective-C

Lazy Properties

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@lazy var processor = DataProcessor() var processorPower:Int { get { return processor.power } set(newPower) { self.processor.power = new.power } }

Swift

Lazy Properties

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// Algorithm.h+ (int)fibonacci:(int)n;!// Algorithm.m+ (int)fibonacci:(int)n { if (n < 2) return 1; return [self fibonacci:n-1] + [self fibonacci:n-2];}

Objective-C

Methods

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class func fibonacci(n: Int) -> Int { if n < 2 { return 1 } return fibonacci(n-1) + fibonacci(n-2) }

Swift

Methods

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// UIView.h+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations;!// Usage[UIView animateWithDuration:2 animations:^{ ....}];

Objective-C

Closures

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// UIView.swift class func animateWithDuration(duration: NSTimeInterval, animations: (() -> Void)!) !//Usage UIView.animateWithDuration(2.5) { .... }

Swift

Closures

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NSArray *arrayOfStrings = @[@"First", @"Second", @2, @"Third"];

Objective-C

var array:Array<Strings> = ["First", "Second", 2, "Third"]

Swift

Generics

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operator infix ^ {} func ^ (var base: Int, power: Int) -> Int { var answer = 1; for _ in 1...power { answer = answer * base } return answer } var x = 2^5 // x = 32

Swift

Defining operators

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// C Functions func arc4random() -> UInt32

!// Core Graphics Classesfunc CGGradientCreateWithColorComponents( space: CGColorSpace!, components: ConstUnsafePointer<CGFloat>, locations: ConstUnsafePointer<CGFloat>, count: UInt) -> CGGradient!

Swift

C Bridging

Performance

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Performance  (seconds)

Objective-­‐C Swift

fibonacci(10) 0,000 0,000

fibonacci(20) 0,000 0,000

fibonacci(30) 0,011 0,015

fibonacci(40) 1,430 1,535

fibonacci(50) 180,486 192,095

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Performance  (seconds)

Objective-­‐C Swift

sum(5000000) 0,026 0,097

sum(8000000) 0,040 0,154

sum(1300000) 0,065 0,263

sum(2100000) 0,103 0,406

sum(3400000) 0,168 0,565

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Open Networking

Tuesday 29 July, meeting #3