Inherits from UIViewController
Declared in JMMCalculatorViewController.h
JMMCalculatorViewController.m

Overview

ViewController that takes button presses and hands them to JMMCalculator to calculate

Tasks

UI Elements

Public Properties

Public Methods

Private Methods

Properties

buttonView

Container view with all of the UIButtons.

@property (weak, nonatomic) IBOutlet UIView *buttonView

Declared In

JMMCalculatorViewController.h

calculator

The running instance of JMMCalculator to do the heavy lifting.

@property (nonatomic, strong) JMMCalculator *calculator

Declared In

JMMCalculatorViewController.h

displayLabel

The main UILabel for displaying results and input.

@property (weak, nonatomic) IBOutlet UILabel *displayLabel

Declared In

JMMCalculatorViewController.h

Instance Methods

buttonIsAnOperation:

Checks whether title is an operation by comparing it to the JMMCalcOperation

- (BOOL)buttonIsAnOperation:(NSString *)title

Parameters

title

The title of the UIButton pressed

Return Value

YES or NO

Declared In

JMMCalculatorViewController.m

calculatorButtonPressed:

Receive calc UIButton tapped and asks handleButtonWithTitlePressed: to take the appropriate action.

- (void)calculatorButtonPressed:(UIButton *)button

Parameters

button

The UIButton that was tapped

Declared In

JMMCalculatorViewController.h

handleButtonWithTitlePressed:

This method decides which UIButton was tapped and calls the appropriate method.

- (void)handleButtonWithTitlePressed:(NSString *)title

Parameters

title

The title of the UIButton pressed. This could be an equal, operation, or numeral button.

Declared In

JMMCalculatorViewController.h

handleEquals

When UIButton tapped is the equals button call [JMMCalculator equate] and set the text of displayLabel to the result of the calculation.

- (void)handleEquals

Discussion

Before equating, if no operation was just pressed add the current display text as an operand to the calculator.

Declared In

JMMCalculatorViewController.m

handleNumeralPressed:

When UIButton tapped is a numeral, concatenate numeral to the displayLabel

- (void)handleNumeralPressed:(NSString *)title

Parameters

title

The numeral that was pressed.

Declared In

JMMCalculatorViewController.m

handleOperationPressed:

When UIButton tapped is an operand button, pass the operand to the [JMMCalculator captureOperand:] and [JMMCalculator captureOperation:] method. This operand will be used later for in the [JMMCalculator equate] operation.

- (void)handleOperationPressed:(NSString *)title

Parameters

title

Title of the operation that was tapped. Passed in from handleButtonWithTitlePressed:

Declared In

JMMCalculatorViewController.m

operationForString:

Translates the NSString representation of an operation to it’s appropriate JMMCalcOperation

- (JMMCalcOperation)operationForString:(NSString *)stringOp

Parameters

stringOp

NSString calcualtor operation

Return Value

The translated JMMCalcOperation

Discussion

Warning: Division not implemented.

Declared In

JMMCalculatorViewController.m

setActionForButtons:

Iterates over given UIButtons and sets their tap action to calculatorButtonPressed:

- (void)setActionForButtons:(NSArray *)buttons

Parameters

buttons

All the buttons

Declared In

JMMCalculatorViewController.h

viewDidLoad

On view load, run setActionForButtons: on all buttons in buttonView and intialize a new JMMCalculator

- (void)viewDidLoad

Declared In

JMMCalculatorViewController.m