IOS開發(fā)代碼分享之用nstimer實(shí)現(xiàn)倒計(jì)時(shí)功能

用nstimer實(shí)現(xiàn)倒計(jì)時(shí)功能，廢話不多說(shuō)，直接上代碼，詳細(xì)解釋請(qǐng)參照注釋

//

[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFireMethod:) userInfo:nil repeats:YES];

//

- (void)timerFireMethod:(NSTimer *)theTimer

{

BOOL timeStart = YES;

NSCalendar *cal = [NSCalendar currentCalendar];//定義一個(gè)NSCalendar對(duì)象

NSDateComponents *endTime = [[NSDateComponents alloc] init];??? //初始化目標(biāo)時(shí)間...

NSDate *today = [NSDate date];??? //得到當(dāng)前時(shí)間

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *dateString = [dateFormatter dateFromString:todate];

NSString *overdate = [dateFormatter stringFromDate:dateString];

//??? NSLog(@"overdate=%@",overdate);

static int year;

static int month;

static int day;

static int hour;

static int minute;

static int second;

if(timeStart) {//從NSDate中取出年月日，時(shí)分秒，但是只能取一次

year = [[overdate substringWithRange:NSMakeRange(0, 4)] intValue];

month = [[overdate substringWithRange:NSMakeRange(5, 2)] intValue];

day = [[overdate substringWithRange:NSMakeRange(8, 2)] intValue];

hour = [[overdate substringWithRange:NSMakeRange(11, 2)] intValue];

minute = [[overdate substringWithRange:NSMakeRange(14, 2)] intValue];

second = [[overdate substringWithRange:NSMakeRange(17, 2)] intValue];

timeStart= NO;

}

[endTime setYear:year];

[endTime setMonth:month];

[endTime setDay:day];

[endTime setHour:hour];

[endTime setMinute:minute];

[endTime setSecond:second];

NSDate *overTime = [cal dateFromComponents:endTime]; //把目標(biāo)時(shí)間裝載入date

//用來(lái)得到具體的時(shí)差，是為了統(tǒng)一成北京時(shí)間

unsigned int unitFlags = NSYearCalendarUnit| NSMonthCalendarUnit| NSDayCalendarUnit| NSHourCalendarUnit| NSMinuteCalendarUnit| NSSecondCalendarUnit;

NSDateComponents *d = [cal components:unitFlags fromDate:today toDate:overTime options:0];

NSString *t = [NSString stringWithFormat:@"%d", [d day]];

NSString *h = [NSString stringWithFormat:@"%d", [d hour]];

NSString *fen = [NSString stringWithFormat:@"%d", [d minute]];

if([d minute] < 10) {

fen = [NSString stringWithFormat:@"0%d",[d minute]];

}

NSString *miao = [NSString stringWithFormat:@"%d", [d second]];

if([d second] < 10) {

miao = [NSString stringWithFormat:@"0%d",[d second]];

}

//??? NSLog(@"===%@天 %@:%@:%@",t,h,fen,miao);

[_longtime setText:[NSString stringWithFormat:@"%@天 %@:%@:%@",t,h,fen,miao]];

if([d second] > 0) {

//計(jì)時(shí)尚未結(jié)束，do_something

//??????? [_longtime setText:[NSString stringWithFormat:@"%@:%@:%@",d,fen,miao]];

} else if([d second] == 0) {

//計(jì)時(shí)結(jié)束 do_something

} else{

//計(jì)時(shí)器失效

[theTimer invalidate];

}

}

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