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  • iPhone学习之秒表

    主视图控制器类头文件

    #import <UIKit/UIKit.h>

    //UITextField与文本框相关的方法

    @interface MainViewController : UIViewController<UITextFieldDelegate>

    {

        int flag;

        NSTimer* time;

        

        int miniSeconds;

        int seconds;

        int minites;

        

    }

    @property (weak, nonatomic) IBOutlet UIButton *startBtn;

    @property (weak, nonatomic) IBOutlet UILabel *showTime;

    - (IBAction)Start:(id)sender;

    - (IBAction)reset:(id)sender;

    @end

    //主视图控制器类实现文件

    #import "MainViewController.h"

    @interface MainViewController ()

    @end

    @implementation MainViewController

    - (void)viewDidLoad {

        [super viewDidLoad];

    //    UIButton* btn = [UIButton buttonWithType:UIButtonTypeCustom];

    //    [btn setFrame:CGRectMake(100, 300, 200, 44)];

    //    [btn setTitle:@"别点击我,否则揍你。" forState:UIControlStateNormal];

    //    [btn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

    //    [btn addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];

    //    [self.view addSubview:btn];

        flag=0;

        

        time=[NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(CalTime) userInfo:nil repeats:YES];

        

        [time setFireDate:[NSDate distantFuture]];

        miniSeconds = 0;

        seconds = 0;

        minites = 0;

        [self.showTime setText:@"00:00:00"];

        [self.showTime setTextColor:[UIColor redColor] ];

        

        // Do any additional setup after loading the view from its nib.

        

      //  [self initDate];

        

        

        

    }

    //当前视图控制器的对象为文本框的代理

    -(BOOL)textFieldShouldReturn:(UITextField *)textField

    {

        [textField resignFirstResponder];//消除文本框的第一响应者

        return YES;

    }

    -(void)initDate

    {

        UITextField* field = [[UITextField alloc] initWithFrame:CGRectMake(50, 50, 200, 30)];

        field.placeholder = @"请输入用户名";//设置占位符

        field.borderStyle = UITextBorderStyleLine;//设置文本框的边框

        

        field.textColor = [UIColor redColor];

        field.delegate=self;//设置文本框的代理

        [self.view addSubview:field];

        //键盘文本的第一响应这

        

    }

    -(void)CalTime

    {

        miniSeconds++;

        if (miniSeconds==100) {

            seconds++;

            if (seconds==60) {

                minites++;

                seconds=0;

            }

            miniSeconds=0;

        }

        NSLog(@"%@", [NSString stringWithFormat:@"%02d:%02d:%02d", minites, seconds, miniSeconds]);

        self.showTime.text=[NSString stringWithFormat:@"%02d:%02d:%02d", minites, seconds, miniSeconds];

    }

    - (void)didReceiveMemoryWarning {

        [super didReceiveMemoryWarning];

        // Dispose of any resources that can be recreated.

    }

    -(void)click

    {

        NSLog(@"好吧!, 你强我不揍你了");

    }

    /*

    #pragma mark - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation

    - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

        // Get the new view controller using [segue destinationViewController].

        // Pass the selected object to the new view controller.

    }

    */

    - (IBAction)Start:(id)sender {

        

       

        if (flag==0) {

            [self.startBtn setTitle:@"停止" forState:UIControlStateNormal];

            flag=1;

            [time  setFireDate:[NSDate date]];

        }

        else if (flag==1)

        {

        

            [self.startBtn setTitle:@"启动" forState:UIControlStateNormal];

            flag=0;

            [time setFireDate:[NSDate distantFuture]];

        }

        

    }

    - (IBAction)reset:(id)sender {

        if (flag == 0) {

            miniSeconds = 0;

            seconds = 0;

            minites = 0;

            self.showTime.text=[NSString stringWithFormat:@"%02d:%02d:%02d", minites, seconds, miniSeconds];

        }

        

    }

    @end

     效果:

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  • 原文地址:https://www.cnblogs.com/about-zj-blog/p/5338936.html
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