iphone进修之旅之实例：LED电子时钟

#import　<UIKit/UIKit.h>

@class　LEDClockViewController;

@interface　LEDClockAppDelegate　:　NSObject　<UIApplicationDelegate>　{
UIWindow　*window;
LEDClockViewController　*viewController;
NSTimer　*timer;
}

@property　(nonatomic,　retain)　IBOutlet　UIWindow　*window;
@property　(nonatomic,　retain)　IBOutlet　LEDClockViewController　*viewController;

-(void)　onInterval;

#import　"LEDClockAppDelegate.h"
#import　"LEDClockViewController.h"

@implementation　LEDClockAppDelegate　

@synthesize　window;
@synthesize　viewController;

-　(void)applicationDidFinishLaunching:(UIApplication　*)application　{

timer=[NSTimer　scheduledTimerWithTimeInterval:(1.0)　target:self　selector:@selector(onInterval)　userInfo:nil　repeats:YES];
[window　addSubview:viewController.view];
[window　makeKeyAndVisible];
}

-(void)　onInterval{
[viewController　interval];
}

-　(void)dealloc　{
[timer　release];
[viewController　release];
[window　release];
[super　dealloc];
}

#import　<UIKit/UIKit.h>

@interface　LEDClockViewController　:　UIViewController　{
IBOutlet　UILabel　*timerLabel;
}

@property　(nonatomic,　retain)　UILabel　*timerLabel;

-(void)　interval;

#import　"LEDClockViewController.h"

@implementation　LEDClockViewController

@synthesize　timerLabel;

-(void)　interval{
NSUInteger　unitFlags=NSHourCalendarUnit　|　NSMinuteCalendarUnit　|　NSSecondCalendarUnit;
NSCalendar　*calendar=[[NSCalendar　alloc]　initWithCalendarIdentifier:NSGregorianCalendar];
NSDate　*date=[NSDate　date];
NSDateComponents　*now=[calendar　components:unitFlags　fromDate:date];
int　hour=[now　hour];
int　minute=[now　minute];
int　second=[now　second];
[timerLabel　setText:[NSString　stringWithFormat:@"%02d:%02d:%02d",hour,minute,second]];
[calendar　release];
}

/*
//　The　designated　initializer.　Override　to　perform　setup　that　is　required　before　the　view　is　loaded.
-　(id)initWithNibName:(NSString　*)nibNameOrNil　bundle:(NSBundle　*)nibBundleOrNil　{
if　(self　=　[super　initWithNibName:nibNameOrNil　bundle:nibBundleOrNil])　{
//　Custom　initialization
}
return　self;
}
*/

/*
//　Implement　loadView　to　create　a　view　hierarchy　programmatically,　without　using　a　nib.
-　(void)loadView　{
}
*/

//　Implement　viewDidLoad　to　do　additional　setup　after　loading　the　view,　typically　from　a　nib.
-　(void)viewDidLoad　{
[timerLabel　setFont:[UIFont　fontWithName:@"DBLCDTempBlack"　size:50.0]];
[timerLabel　setText:@"电子时钟"];
[super　viewDidLoad];
}

//　Override　to　allow　orientations　other　than　the　default　portrait　orientation.
-　(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation　{
//　Return　YES　for　supported　orientations
//return　(interfaceOrientation　==　UIInterfaceOrientationPortrait);
return　YES;
}

-　(void)didReceiveMemoryWarning　{
//　Releases　the　view　if　it　doesn't　have　a　superview.
[super　didReceiveMemoryWarning];

//　Release　any　cached　data,　images,　etc　that　aren't　in　use.
}

-　(void)viewDidUnload　{
//　Release　any　retained　subviews　of　the　main　view.
//　e.g.　self.myOutlet　=　nil;
}

-　(void)dealloc　{
[timerLabel　release];
[super　dealloc];
}