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Commit ab043d9

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author
Bob Lee
committed
Added delegate
1 parent 37d2f3b commit ab043d9

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4 files changed

+27
-9
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4 files changed

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‎source-code/4000_protocol_oriented_swift/4004_delegate.playground/Contents.swift‎

Lines changed: 26 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -4,13 +4,15 @@
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### Protocol Oriented Swift
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### Delegate
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7-
**Problem:** Communicate between classes and structs
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**Problem:** How does delegate even work?
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---
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*/
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//: Delegate
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//: 1. A gift from Apple engineers
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//: 2. microwave analogy
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//: > **Purpose of Delegate:** Communicate between objects
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//: **Goal:** Send data from `FirstVC` to `SecondVC`
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//: Design Protocol
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protocol PassDataDelegate {
@@ -20,16 +22,17 @@ protocol PassDataDelegate {
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//: Design Delegator (Sender)
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class FirstVC {
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func drawCircle() {}
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var delegate: PassDataDelegate?
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}
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FirstVC().delegate?.passData(data: "Bob")
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FirstVC().delegate?.passData(data: "A bunch of contracts")
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//: Design Delegate (Receiver)
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class SecondVC: PassDataDelegate {
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func passData(data: String) {
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print("Something happened")
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print("The CEO gave me \(data)")
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}
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}
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@@ -40,17 +43,32 @@ let secondVC = SecondVC()
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//: Assign Delegate
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firstVC.delegate = secondVC
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firstVC.delegate?.passData(data: "Hello, 1231231")
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firstVC.delegate?.passData(data: "A bunch of contracts")
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//: Practical Example in iOS
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import UIKit
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class BobViewController: UIViewController, UITableViewDelegate {
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let tableView = UITableView()
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override func viewDidLoad() {
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super.viewDidLoad()
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tableView.delegate = self
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}
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func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
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print(indexPath)
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}
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}
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//: tableView.delegate.tableView(_ tableView: UITableView, didSelectRorwAt indexPath: IndexPath)
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// UITableView is the delegator/CEO/sender
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// BobViewController is the delegate/Secretary/receiver
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Lines changed: 1 addition & 1 deletion
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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
2-
<playground version='5.0' target-platform='ios' display-mode='raw'>
2+
<playground version='5.0' target-platform='ios' display-mode='rendered'>
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<timeline fileName='timeline.xctimeline'/>
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</playground>

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