我用start
, stop
,设置了三个按钮pause
。并给 NSTimer 控制以计算。开始停止按钮工作正常给我开始和停止时间,但pause
按钮没有给我准确的时间。它实际上暂停时间..但重新开始它添加暂停的定时和显示 [ay. 假设我在开始的 5 秒处暂停并等待 5 秒然后按开始...它应该显示 5 ...但显示 10 ..
-(void)start:(NSTimer *)timer
{
if(_timer==nil)
{
startDate =[NSDate date];
_timer=[NSTimer scheduledTimerWithTimeInterval:0.25 target:self selector:@selector(timer:) userInfo:nil repeats:YES];
}
if(_timer!=nil)
{
float pauseTime = -1*[pauseStart timeIntervalSinceNow];
[_timer setFireDate:[previousFireDate initWithTimeInterval:pauseTime sinceDate:previousFireDate]];
}
}
-(void)timer:(NSTimer *)timer
{
NSInteger secondsSinceStart = (NSInteger)[[NSDate date] timeIntervalSinceDate:startDate];
NSInteger seconds = secondsSinceStart % 60;
NSInteger minutes = (secondsSinceStart / 60) % 60;
NSInteger hours = secondsSinceStart / (60 * 60);
NSString *result = nil;
if (hours > 0)
{
result = [NSString stringWithFormat:@"%02d:%02d:%02d", hours, minutes, seconds];
}
else
{
result = [NSString stringWithFormat:@"%02d:%02d", minutes, seconds];
}
label.text=result;
NSLog(@"time interval -> %@",result);
}
-(void)stop
{
if(_timer!=nil)
{
endDate = [NSDate date];
NSLog(@"endate%@",endDate);
NSTimeInterval interval = [endDate timeIntervalSinceDate:startDate];
NSLog(@"total time %f",interval);
[_timer invalidate];
_timer = nil;
startDate=nil;
}
}
-(void)pause:(NSTimer *)timer
{
pauseStart = [NSDate dateWithTimeIntervalSinceNow:0];
previousFireDate = [_timer fireDate];
[_timer setFireDate:[NSDate distantFuture]];
}