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ALRT

November 3, 2023

An easier constructor for UIAlertController. Present an alert from anywhere like this.


                                              
                                                ALRT.create(.alert, title: “Alert?”).addOK().addCancel().show()

Features

Chainable UIAlertController Setup Methods
Support .alert and .actionSheet UIAlertController.Style
Support UITextfield UIAlertAction(.alert only)
Returns Result whether an alert is successfully displayed. In other words, Unit Testable.

Requirements

Xcode 10.2+
Swift 5.0
iOS 9.0+

Installation

Carthage


                                              
                                                github “mshrwtnb/ALRT” ~> 1.3.7

CocoaPods


                                              
                                                pod repo update

pod ‘ALRT’, ‘~> 1.3.7’

Usage

Basics

.alert


                                              
                                                import ALRT
// Instantiate an .alert-type UIAlertController with OK and Cancel actions. Finally, present the alert by calling `show()`.

ALRT.create(.alert, title: “Title”, message: “Message”).addOK().addCancel().show()

.actionSheet


                                              
                                                // Instantiate an .actionSheet-type UIAlertController.

ALRT.create(.actionSheet, message: “Action Sheet”)

.addAction(“Option A”)

.addAction(“Option B”)

.addDestructive(“Destructive Option”)

.show()

Action Types

Each action comes with different UIAlertAction.Style.


                                              
                                                ALRT.create(.alert, title: “Action Types?”)

.addAction(“🏂”) // .default if not specified

.addOK() // .default

.addCancel(“❌”) // .cancel

.addDestructive(“💣”) // .destructive

.show()

Custom Title

OK and Cancel actions have default titles in English; “OK” and “Cancel”. Here, we’re overriding the titles in Japanese.


                                              
                                                ALRT.create(.alert, title: “Actions In Japanese?”).addOK(“オーケー”).addCancel(“キャンセル”).show()

Action Handling

Each action has handler that is called when user taps the action. The closure takes two parameters: UIAlertAction and [UITextField]?. The former is self-explanatory. The latter is present if text field(s) is/are added to the alert.


                                              
                                                ALRT.create(.alert, title: “Action Handling”)

.addOK() { action, textFields in

print(“\(action.title!) tapped”)

}

.show()

Result Handling

show() has a completion handler that takes Result. You can ensure if the alert was shown successfully or not. This is useful for unit tests.


                                              
                                                ALRT.create(.alert, title: “Result Handling”)

.addOK()

.show() { result in

switch result {

case .success:

print(“Alert is successfully shown”)

case .failure(let error):

print(“Error occurred. \(error.localizedDescription)”)

}

}

TextField(s)

Textfield(s) can be added to an alert in an use-case such as login.


                                              
                                                enum TextFieldIdentifier: Int {

case username

case password

}
ALRT.create(.alert, title: “Enter your credentials”)

// Configure textfield

.addTextField { textfield in

textfield.placeholder = “Username”

textfield.tag = TextFieldIdentifier.username.rawValue

}

.addTextField() { textField in

textField.placeholder = “Password”

textField.isSecureTextEntry = true

textField.tag = TextFieldIdentifier.password.rawValue

}

// If an user selects “Login”, textfields above are retrieved in the trailing closure. Distinguish one from another with a tag or identifier.

.addAction(“Login”) { _, textfields in

for textField in textfields ?? [] {

if let identifier = TextFieldIdentifier(rawValue: textField.tag) {

switch identifier {

case .username:

// Extract username

case .password:

// Extract password

}

}

}

}

.addCancel()

.show()

Changing source ViewController to present from

Although ALRT can present an alert anywhere, you might want to specify a source view controller for some reason. This can be done easily by passing a view controller to show().


                                              
                                                ALRT.create(.alert, title: “Source?”)

.addOK()

.show(self) // self = source view controller

Default Configuration

Set default tintColor and titles for OK and Cancel buttons.


                                              
                                                ALRT.defaultConfiguration = .init(

tintColor: UIColor.blue,

okTitle: “OK👍”,

cancelTitle: “Cancel👎”

)

GitHub

View Github

#swift #uialertcontroller #uialertview

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