一，效果圖。

二，代碼。

RootViewController.h

#import <UIKit/UIKit.h>@interface RootViewController : UIViewController {UILabel *label;NSDateFormatter *dateFormatter ; } @end

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RootViewController.m

#import "RootViewController.h"@interface RootViewController ()@end@implementation RootViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];if (self) {// Custom initialization}return self; }- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view.//labellabel=[[UILabel alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];label.backgroundColor=[UIColor redColor];[self.view addSubview:label];//定時(shí)器[NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(updateTime) userInfo:nil repeats:YES];dateFormatter = [[NSDateFormatter alloc] init];[dateFormatter setDateFormat:@"HH:mm:ss"];} - (void)updateTime {label.text = [dateFormatter stringFromDate:[NSDate date]]; }

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轉(zhuǎn)載于:https://www.cnblogs.com/yang-guang-girl/p/5727997.html

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