//
//  ViewController.m
//  timer
//
//  Created by apple  on 14/11/11.
//  Copyright (c) 2014年 guocheng. All rights reserved.
//


#import "ViewController.h"


@interface ViewController ()
{
    int i ;
    NSTimer*timer;
    UILabel * label;


}
@end


@implementation ViewController


- (void)viewDidLoad {
    [super viewDidLoad];


//创建定时器
    timer =  [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(labeltext) userInfo:nil repeats:YES];
//让定时器处于关闭状态
   [timer setFireDate:[NSDate distantFuture]];


UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(50, 50, 50, 50);
    [button setTitle:@"开始" forState:UIControlStateNormal];
    [button setTitle:@"暂停" forState:UIControlStateSelected];
    [button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
    button.backgroundColor = [UIColor redColor];
    [self.view addSubview:button];
    [self createUI];
}


-(void)buttonClick:(UIButton*)bt{

    if (bt.selected==YES) {


         NSLog(@"ddddddddd");
//当button 处于选择状态的时候 开启定时器
        [timer setFireDate:[NSDate distantFuture]];

//将button的状态至为no
        bt.selected =NO;
            }
    else{

            NSLog(@"PPPPPPP");
        bt.selected =YES;

       [timer setFireDate:[NSDate distantPast]];



    }

   }
-(void)labeltext{
NSLog(@"111111");
    i++;
label.text =[NSString stringWithFormat:@"%d",i];


}
-(void)createUI{

label = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];

        [self.view addSubview:label];


}
//页面消失，进入后台不显示该页面，关闭定时器
-(void)viewDidDisappear:(BOOL)animated
{
//关闭定时器
    [timer setFireDate:[NSDate distantFuture]];
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}


@end