获取当前的日期和时间－数码

IOS---如何获取当前的日期和时间，并显示

创建两个UILable: Lable1,Lable2.创建好IBOutlate并连线， 然后用如下方法：

-(void)updateLabel {

NSDate* now = [NSDate date];

NSCalendar *cal = [NSCalendar currentCalendar];

unsigned
int unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit |NSSecondCalendarUnit;

NSDateComponents *dd = [cal components:unitFlags fromDate:now];

int y = [dd year];

int m = [dd
month];

int d = [dd day];

int hour = [dd hour];

int min = [dd minute];

int sec = [dd second];

Lable1.text
= [NSString stringWithFormat:@"2d%:2d%:2d%",y,m,d];

Lable2.text =[NSStrinstringWithFormat:@"2d%:2d%:2d%",hour,min,sec];

}

- (void)onTimer {

[viewController updateLabel];

}

在AppDeletate.m文件中增加如下方法：

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

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

[window addSubview:viewController.view];

[window
makeKeyAndVisible];

}