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[操作系统]【代码笔记】UILable电子表显示


一,效果图。

二,代码。

RootViewController.h

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

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#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.    //label  label=[[UILabel alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];  label.backgroundColor=[UIColor redColor];  [self.view addSubview:label];    //定时器  [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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