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iOS如何實(shí)現(xiàn)毫秒倒計(jì)時(shí)-創(chuàng)新互聯(lián)
這篇文章將為大家詳細(xì)講解有關(guān)iOS如何實(shí)現(xiàn)毫秒倒計(jì)時(shí)，小編覺(jué)得挺實(shí)用的，因此分享給大家做個(gè)參考，希望大家閱讀完這篇文章后可以有所收獲。
實(shí)現(xiàn)方法
自定義一個(gè)UIview，將倒計(jì)時(shí)封裝起來(lái)。
一、在MsecCountDownView.h中增加時(shí)間戳和計(jì)時(shí)器這兩屬性
@interface MsecCountDownView : UIView @property(nonatomic, assign)double timeInterval;//未來(lái)某個(gè)日期的時(shí)間戳 @property(nonatomic, strong)NSTimer *timer ; //定時(shí)器 @end
二、在MsecCountDownView.m實(shí)現(xiàn)相關(guān)UI及倒計(jì)時(shí)方法
@interface MsecCountDownView (){
UIView *countdownBackView;
CGFloat _passTime;
}
@property(nonatomic, strong)UILabel *tipLabel;
@property(nonatomic, strong)UILabel *hoursLabel;
@property(nonatomic, strong)UILabel *minutesLabel;
@property(nonatomic, strong)UILabel *secondsLabel;
@property(nonatomic, strong)UILabel *millionSecondsLabel;
@property(nonatomic, strong)UILabel *label1;
@property(nonatomic, strong)UILabel *label2;
@property(nonatomic, strong)UILabel *label3;
@property(nonatomic, strong)UILabel *label4;
@end創(chuàng)建相關(guān)UI
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
countdownBackView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
[self addSubview:countdownBackView];
_tipLabel=[[UILabel alloc] init];
_tipLabel.frame = CGRectMake(0, 0, 40, countdownBackView.frame.size.height);
[countdownBackView addSubview:_tipLabel];
_tipLabel.font = [UIFont systemFontOfSize:12];
//小時(shí)
_hoursLabel=[[UILabel alloc] initWithFrame:CGRectMake(_tipLabel.frame.origin.x+_tipLabel.frame.size.width, 0, 35, countdownBackView.frame.size.height)];
[countdownBackView addSubview:_hoursLabel];
_hoursLabel.font = [UIFont systemFontOfSize:11];
_label1=[[UILabel alloc] initWithFrame:CGRectMake(_hoursLabel.frame.origin.x+_hoursLabel.frame.size.width, _hoursLabel.frame.origin.y, 8, countdownBackView.frame.size.height)];
[countdownBackView addSubview:_label1];
//分鐘
_minutesLabel=[[UILabel alloc] initWithFrame:CGRectMake(_label1.frame.origin.x+_label1.frame.size.width, _hoursLabel.frame.origin.y, 20, countdownBackView.frame.size.height)];
[countdownBackView addSubview:_minutesLabel];
_minutesLabel.font = [UIFont systemFontOfSize:11];
_label2=[[UILabel alloc] initWithFrame:CGRectMake(_minutesLabel.frame.origin.x+_minutesLabel.frame.size.width, _hoursLabel.frame.origin.y, 8, countdownBackView.frame.size.height)];
[countdownBackView addSubview:_label2];
//秒
_secondsLabel=[[UILabel alloc] initWithFrame:CGRectMake(_label2.frame.origin.x+_label2.frame.size.width, _hoursLabel.frame.origin.y, 20 , countdownBackView.frame.size.height)];
[countdownBackView addSubview:_secondsLabel];
_secondsLabel.font = [UIFont systemFontOfSize:11];
_label3=[[UILabel alloc] initWithFrame:CGRectMake(_secondsLabel.frame.origin.x+_secondsLabel.frame.size.width, _hoursLabel.frame.origin.y, 8 , countdownBackView.frame.size.height)];
[countdownBackView addSubview:_label3];
_millionSecondsLabel=[[UILabel alloc] initWithFrame:CGRectMake(_label3.frame.origin.x+_label3.frame.size.width, _hoursLabel.frame.origin.y, 20, countdownBackView.frame.size.height)];
[countdownBackView addSubview:_millionSecondsLabel];
//毫秒
_millionSecondsLabel.font = [UIFont systemFontOfSize:11];
_label1.textAlignment=1;
_label2.textAlignment=1;
_label3.textAlignment = 1;
_hoursLabel.textAlignment=1;
_minutesLabel.textAlignment=1;
_secondsLabel.textAlignment=1;
_millionSecondsLabel.textAlignment=1;
_passTime=0.0;
}
return self;
}生成一個(gè)計(jì)時(shí)器
//得到未來(lái)某個(gè)日期的時(shí)間戳，與當(dāng)前時(shí)間戳相比，得到兩者的時(shí)間差，生成定時(shí)器
- (void)setTimeInterval:(double)timeInterval
{
_timeInterval = timeInterval ;
NSDateFormatter *dataFormatter = [[NSDateFormatter alloc] init];
dataFormatter.dateFormat = @"MM/dd/yyyy HH:mm:ss.SSS";
//獲取當(dāng)前系統(tǒng)的時(shí)間，并用相應(yīng)的格式轉(zhuǎn)換
[dataFormatter stringFromDate:[NSDate date]];
NSString *currentDayStr = [dataFormatter stringFromDate:[NSDate date]];
NSDate *currentDate = [dataFormatter dateFromString:currentDayStr];
//優(yōu)惠結(jié)束的時(shí)間，也用相同的格式去轉(zhuǎn)換
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeInterval/1000.0];
NSString *deadlineStr = [dataFormatter stringFromDate:date];
NSDate *deadlineDate = [dataFormatter dateFromString:deadlineStr];
_timeInterval=[deadlineDate timeIntervalSinceDate:currentDate]*1000;
if (_timeInterval!=0)
{
//時(shí)間間隔是100毫秒，也就是0.1秒
_timer = [NSTimer scheduledTimerWithTimeInterval:0.1f target:self selector:@selector(timerAction) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:_timer forMode:UITrackingRunLoopMode];
}else{
[countdownBackView removeFromSuperview];
}
}實(shí)現(xiàn)每隔100毫秒執(zhí)行的方法，更新倒計(jì)時(shí)器上面相應(yīng)的數(shù)值
// 每間隔100毫秒定時(shí)器觸發(fā)執(zhí)行該方法
- (void)timerAction
{
[self getTimeFromTimeInterval:_timeInterval] ;
// 當(dāng)時(shí)間間隔為0時(shí)干掉定時(shí)器
if (_timeInterval-_passTime == 0)
{
[_timer invalidate] ;
_timer = nil ;
}
}
// 通過(guò)時(shí)間間隔計(jì)算具體時(shí)間(小時(shí),分,秒,毫秒)
- (void)getTimeFromTimeInterval : (double)timeInterval
{
//1s=1000毫秒
_passTime += 100.f;//毫秒數(shù)從0-9，所以每次過(guò)去100毫秒
_tipLabel.text=@"還剩：";
_label3.text=@".";
_label2.text=@":";
_label1.text=@":";
//小時(shí)數(shù)
NSString *hours = [NSString stringWithFormat:@"%ld", (NSInteger)((timeInterval-_passTime)/1000/60/60)];
//分鐘數(shù)
NSString *minute = [NSString stringWithFormat:@"%ld", (NSInteger)((timeInterval-_passTime)/1000/60)%60];
//秒數(shù)
NSString *second = [NSString stringWithFormat:@"%ld", ((NSInteger)(timeInterval-_passTime))/1000%60];
//毫秒數(shù)
CGFloat sss = ((NSInteger)((timeInterval - _passTime)))%1000/100;
NSString *ss = [NSString stringWithFormat:@"%.lf", sss];
if (minute.integerValue < 10) {
minute = [NSString stringWithFormat:@"0%@", minute];
}
self.hoursLabel.text = [NSString stringWithFormat:@"%@",hours];
self.minutesLabel.text = [NSString stringWithFormat:@"%@",minute];
self.secondsLabel.text = [NSString stringWithFormat:@"%@",second];
self.millionSecondsLabel.text = [NSString stringWithFormat:@"%@",ss];
if (timeInterval - _passTime <= 0) {
[countdownBackView removeFromSuperview];
[self removeFromSuperview];
}
}三、在ViewController.m給倒計(jì)時(shí)器賦值，實(shí)現(xiàn)自己想要的倒計(jì)時(shí)
- (void)viewDidLoad {
[super viewDidLoad];
msecView=[[MsecCountDownView alloc] initWithFrame:CGRectMake(50, 100, self.view.frame.size.width-100, 16)];
[self.view addSubview:msecView];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];
NSDate* date = [formatter dateFromString:@"2017-04-11 15:10:00.000"];
//將日期轉(zhuǎn)換成時(shí)間戳
NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue]*1000;
msecView.timeInterval=timeSp;
}這樣就實(shí)現(xiàn)倒計(jì)時(shí)的功能了。但是使用倒計(jì)時(shí)還需要注意一點(diǎn)，當(dāng)離開(kāi)該頁(yè)面的時(shí)候，記得把定時(shí)器暫停，等回到該頁(yè)面的時(shí)候再啟動(dòng)倒計(jì)時(shí)。
這個(gè)可以通過(guò)以下兩方法實(shí)現(xiàn)。
-(void)viewWillAppear:(BOOL)animated{
// 頁(yè)面出現(xiàn)時(shí)，開(kāi)啟計(jì)時(shí)器
[msecView.timer setFireDate:[NSDate distantPast]];
}
-(void)viewWillDisappear:(BOOL)animated{
// 頁(yè)面消失時(shí)，暫停提示器
[msecView.timer setFireDate:[NSDate distantFuture]];
}關(guān)于“iOS如何實(shí)現(xiàn)毫秒倒計(jì)時(shí)”這篇文章就分享到這里了，希望以上內(nèi)容可以對(duì)大家有一定的幫助，使各位可以學(xué)到更多知識(shí)，如果覺(jué)得文章不錯(cuò)，請(qǐng)把它分享出去讓更多的人看到。
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文章標(biāo)題：iOS如何實(shí)現(xiàn)毫秒倒計(jì)時(shí)-創(chuàng)新互聯(lián)
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