NSTimer减少秒/毫秒的时间
问题描述:
我正在开发一个QuiZ应用程序。它需要一个倒数计时器,因为我想在75:00.00(mm:ss.SS)启动一个计时器,并通过减少1毫秒将其减少到00:00.00(mm:ss.SS)。我想显示一个提醒,即时间!当时间到达00:00.00(mm:ss.SS)时。NSTimer减少秒/毫秒的时间
我通过下面的链接
Stopwatch using NSTimer incorrectly includes paused time in display
答
这是一个简单的解决方案,您的问题。
声明
@interface ViewController : UIViewController
{
IBOutlet UILabel * result;
NSTimer * timer;
int currentTime;
}
- (void)populateLabelwithTime:(int)milliseconds;
-(IBAction)start;
-(IBAction)pause;
@end
定义
- (void)viewDidLoad
{
[super viewDidLoad];
currentTime = 270000000; // Since 75 hours = 270000000 milli seconds
}
-(IBAction)start{
timer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];
}
-(IBAction)pause{
[timer invalidate];
}
- (void)updateTimer:(NSTimer *)timer {
currentTime -= 10 ;
[self populateLabelwithTime:currentTime];
}
- (void)populateLabelwithTime:(int)milliseconds {
int seconds = milliseconds/1000;
int minutes = seconds/60;
int hours = minutes/60;
seconds -= minutes * 60;
minutes -= hours * 60;
NSString * result1 = [NSString stringWithFormat:@"%@%02dh:%02dm:%02ds:%02dms", (milliseconds<[email protected]"-":@""), hours, minutes, seconds,milliseconds%1000];
result.text = result1;
}
答
使用缩短定时器下面的代码显示的时间。
double dblRemainingTime=60; //1 minute
if(dblRemainingTime >0)
{
dblRemainingTime -= 1;
int hours,minutes, seconds;
hours = dblRemainingTime/3600;
minutes = (dblRemainingTime - (hours*3600))/60;
seconds = fmod(dblRemainingTime, 60);
[lblRemainingTime setText:[NSString stringWithFormat:@"%02d:%02d",minutes, seconds]];
}
else
alert('Time up buddy');
+1了详细的解释。保持。 – 2012-04-21 09:14:57
海它工作正常,有一些变化...我有滚动视图,其中我显示的时间..如果我拖动滚动视图时间不计算(在背景也)...我必须做的。 ..? – SriKanth 2012-04-21 12:33:01
添加此代码以在滚动期间启用计时器 ........................................ .......................................... - (IBAction)start { timer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(updateTimer :) userInfo:nil repeatats:YES]; [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes]; } – 2012-04-22 06:15:54