Tip calculator in iPhone

1. AppDelegate. h

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2. AppDelegate. m

3. ViewController. h

4. ViewController. m

# Import "ViewController. h"

@ Interface ViewController ()

@ End

@ Implementation ViewController

@ Synthesize bilField;

@ Synthesize tipFieldTen;

@ Synthesize tipFieldFifteen;

@ Synthesize tipFieldTwenty;

@ Synthesize tipFieldCustom;

@ Synthesize totalFieldCustom;

@ Synthesize totalFieldTen;

@ Synthesize totalFieldFifteen;

@ Synthesize totalFieldTwenty;

@ Synthesize customPercentLabel;

@ Synthesize customPercentSlider;

-(Void) viewDidLoad

{

[SuperviewDidLoad];

BilField. delegate = self;

// Do any additional setup after loading the view, typically from a nib.

}

-(Void) didReceiveMemoryWarning

{

[SuperdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

-(Void) awakeFromNib // call this method when all GUI elements are loaded.

{

[BilFieldbecomeFirstResponder]; // displays the key used for bilField input.

}

-(BOOL) textFieldShouldReturn :( UITextField *) textField // used to hide the keyboard

{

[TextField resignFirstResponder];

Return YES;

}

-(IBAction) calculate :( id) sender

{

Static BOOL toggle = YES; // mark whether this method is triggered by a user

If (toggle) // if the user inputs or slides the slider from the keyboard

{

Toggle = NO; // set the flag. The next call to this method will be triggered by the program.

NSString * billFieldText = bilField. text;

Float newTotal = [billFieldText floatValue]; // converts the string type to the floating point type

Float customTipPercent = customPercentSlider. value; // obtain the value of the slider.

If (sender = bilField)

{// Determine whether the event is triggered by bilField

If (billFieldText. length

BillTotal = [NSString stringWithFormat: @ "%. 02f", newTotal/10];

Else

BillTotal = [NSString stringWithFormat: @ "%. 02f", newTotal * 10];

BilField. text = billTotal; // update the text displayed on the interface to the formatted result.

NewTotal = [billTotal floatValue]; // set newTotal to a new value.

// Calculate the tip amount based on the three percentages of 10%, 15%, and 20% respectively.

Float tenTip = maid * 0.10;

Float effecteentip = newTotal * 0.15;

Float twentyTip = maid * 0.20;

// Set the value displayed in the Tip bar

TipFieldTen. text = [NSString stringWithFormat: @ "% 0.2f", tenTip];

TipFieldFifteen. text = [NSString stringWithFormat: @ "% 0.2f", fifteenTip];

TipFieldTwenty. text = [NSString stringWithFormat: @ "% 0.2f", twentyTip];

// Set the value displayed in the Total column

TotalFieldTen. text = [NSString stringWithFormat: @ "% 0.2f", newTotal + tenTip];

TotalFieldFifteen. text = [NSString stringWithFormat: @ "% 0.2f", newTotal + deleteentip];

TotalFieldTwenty. text = [NSString stringWithFormat: @ "% 0.2f", newTotal + twentyTip];

}

Else if (sender = customPercentSlider) // determines whether the event is triggered by customPercentSlider.

{

Int percentage = (int) (customTipPercent * 100); // convert the percentage of the slider to an integer.

CustomPercentLabel. text = [NSString stringWithFormat: @ "% I %", percentage]; // update the tip percentage displayed on the tag, in the form of XX %

Float newSliderValue = (float) percentage)/100; // convert the percentage to a decimal number and assign it to the slider.

CustomPercentSlider. value = newSliderValue;

CustomTipPercent = newSliderValue; // you can call this operation to update the value of customTipPercent based on the ratio of the slider.

}

// Calculate the customTip Value

Float customTip = customTipPercent * newTotal;

TipFieldCustom. text = [NSString stringWithFormat: @ "%. 02f", customTip];

// Update totalFieldCustom

TotalFieldCustom. text = [NSString stringWithFormat: @ "%. 02f", customTip + newTotal];

}

Else

{

Toggle = YES;

}

}

@ End

After running: