Extension and Protocol

Posted by On 8月 27, 2014 0 Comment

Extension

It’s kind of Category for Objective-C??

Sample

I tried NSString contains I did in Objective-C
StringUtils.swift

import Foundation

extension String {
    func contains(parts : String) -> Bool {
        return self.rangeOfString(parts) != nil;
    }
}

Test

let str : String = "abcdefg"
let target : String = "ddd"
let target2 : String = "def"
        
println(str.contains(target))
println(str.contains(target2))

Result

false
true

Protocol

Protocol seems to be same as Objective-C.
Is like Java interface.

Example(ProtocolTest.swift)

import Foundation

protocol TestProtocol {
    
    var desc: String { get }
    
    func test()
    
}

class ImplTestProtocol : TestProtocol {
    
    var desc : String = "Test"
    
    func test() {
        println(desc)
    }
}

Test

let impl = ImplTestProtocol()
impl.test()

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