iOS 实现倒计时

时间：2015-04-22 18:15:23 阅读：196 评论：0 收藏：0 [点我收藏+]

#import "ViewController.h"
#import "QSSDateHelper.h"
@interface ViewController ()
@property (nonatomic,strong) UIButton *btn;
@property (nonatomic,assign) BOOL isTouch;
@property (nonatomic,assign) NSInteger time;
@property (nonatomic,assign) int year;
@property (nonatomic,assign) int mouth;
@property (nonatomic,assign) int day;
@property (nonatomic,assign) int hour;
@property (nonatomic,assign) int minute;
@property (nonatomic,assign) int second;
@property (nonatomic,assign) int myTouchSecond;
@property NSDate *touchDate;
@property NSCalendar *cal;
@property NSTimer *timer ;
@end

@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    [self initBtn];
    self.isTouch=NO;

}
- (void)dealloc{
    [self.timer invalidate];
    self.timer=nil;
    self.time=0;
}
- (void)initBtn{
    self.btn=[[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    [self.btn setTitle:@"倒计时" forState:UIControlStateNormal];
    [self.btn setBackgroundColor:[UIColor lightGrayColor]];
    [self.view addSubview:self.btn];
    [self.btn addTarget:self action:@selector(releaseTime) forControlEvents:UIControlEventTouchUpInside];
}
- (void)timerFireMethod:(NSTimer *)timer{



    //NSDate *dd = [NSDate dateWithTimeIntervalSince1970:self.myTouchSecond];
    int targetSecond = self.myTouchSecond + 10*60;//目标的时间

    //把目标的秒数转化为固定格式的秒数

    NSDate *dd = [NSDate dateWithTimeIntervalSince1970:targetSecond];

    unsigned int time2=NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond;

    NSCalendar *cal=[NSCalendar currentCalendar];

    NSDateComponents *t2=[cal components:time2 fromDate:dd];
    //==================开始定时的时间=====================
    unsigned int time=NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond;

    NSDateComponents *t=[self.cal components:time fromDate:self.touchDate]; //开始定时的时间
    NSLog(@"开始倒计时的时间:%d天%d小时%d分钟%d秒",(int)t.day,(int)t.hour,(int)t.minute,(int)t.second);
    //==================目标时间==========================
    NSLog(@"目标时间:%d天%d小时%d分钟%d秒",(int)t2.day,(int)t2.hour,(int)t2.minute,(int)t2.second);
    //目标时间
    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSDateComponents *components = [[NSDateComponents alloc] init];

    [components setYear:t2.year];
    [components setMonth:t2.month];
    [components setDay:t2.day];
    [components setHour:t2.hour];
    [components setMinute:t2.minute];

    NSLog(@"minute +++++ 10   %d",self.minute+10);
    [components setSecond:self.second];

    unsigned int unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;

    //NSDate *fireDate = [calendar dateFromComponents:components];//目标时间


    NSDate *nowhhhhh=[NSDate date];



    NSDateComponents *d = [calendar components:unitFlags fromDate:nowhhhhh toDate:dd options:0];//计算时间差


    UIAlertView *alert=[[UIAlertView alloc]initWithTitle:[NSString stringWithFormat:@"%d分钟%d秒",(int)[d minute],(int)[d second]] message:@"倒计时" delegate:self cancelButtonTitle:@"我知道了" otherButtonTitles:nil, nil];

    alert.delegate=self;

    [alert show];

}
- (void)releaseTime{
    self.time++;
    self.isTouch=YES;
    if (self.time==1){
        NSLog(@"开始倒计时");
        //当前时间只调用一次这个方法。。。
        NSDate *now=[NSDate date];
        NSCalendar *cal=[NSCalendar currentCalendar];
        unsigned int time=NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond;
        NSDateComponents *t=[cal components:time fromDate:now];
        self.year=(int)[t year];
        self.mouth=(int)[t month];
        self.day=(int)[t day];
        self.hour=(int)[t hour];
        self.minute=(int)[t minute];
        self.second=(int)[t second];




        NSTimeInterval time2=[[NSDate date] timeIntervalSince1970];
        self.myTouchSecond = time2;
        NSLog(@"date\n%d", self.myTouchSecond);


        self.touchDate=now;
        self.cal=cal;
    }else{
        self.timer=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFireMethod:) userInfo:nil repeats:NO];
        [self.timer setFireDate:[NSDate distantPast]];
    }

}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

@end

iOS 实现倒计时

标签：ios nstimer 倒计时

原文地址：http://blog.csdn.net/darongzi1314/article/details/45197535

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