Minute to midnight in Iphone

In this tutorial we will see the app is "Minutes to Midnight" is simply a countdown of the time left before the day ends. This is the view based apps.

Here are some steps for it…

1. Open the xcode & choose "File->New Project".

2. Select "Application" from left menu and then "View-based Application".

3.Name your project as "MinutesToMidnight" and save the project.

4.Now just select "timerViewController.h" file from left menu for define a UILabel . Set the property for UILabel.

#import <UIKit/UIKit.h>

@interface timerViewController : UIViewController {

IBOutlet UILabel *timeLabel; 

NSTimer *timer;

}

@property(nonatomic,retain) UILabel *timeLabel; 

-(void)onTimer;

@end

5. Now select "timerViewController.m" file from menu for implementation.

- (void)viewDidLoad {

    [super viewDidLoad];

[timeLabel setFont:[UIFont fontWithName:@"DBLCDTempBlack" size:128.0]];

timer=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];

}

-(void)onTimer{

NSDate *time=[NSDate date];

int hour=23-(int)[[time dateWithCalendarFormat:nil timeZone:nil] hourOfDay];

int min=59-(int)[[time  dateWithCalendarFormat:nil timeZone:nil] minuteOfHour];

int sec =59-(int)[[time dateWithCalendarFormat:nil timeZone:nil] secondOfMinute];

timeLabel.text=[NSString stringWithFormat:@"%2d:%2d:%2d",hour,min,sec];

}

- (void)dealloc {

    [super dealloc];

}

@end

6. Now double click on "timerViewController.xib" from Resource folder for open it.

7. On the view window drag the label from library . Then link the label  to the File's Owner. 

8. Then Quit and Save the Interface Builder.

9. Now you are ready for  click on "Build & Go" button. 

Now you can see the output in iphone simulator .