我有三个按钮start
stop
和pause
..My start
和stop
按钮做工精细与下面code..but时按Pause
它暂停计时器..但是当再次按下start.IT继续从新增加的时间...不是从暂停时间....
supoose我暂停以5秒的启动,等待5秒钟,然后按开始...它应该显示5 ......但因为我没有在start
timer!=nill
提到(timer:)
显示10 ..
.. 。 怎么会被添加..
我有问题:
Pause
不工作。
-(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)
{
startDate=nil;
[_timer invalidate];
_timer = nil;
}
}
-(void)pause:(NSTimer *)timer
{
pauseStart = [NSDate dateWithTimeIntervalSinceNow:0];
previousFireDate = [_timer fireDate];
[_timer setFireDate:[NSDate distantFuture]];
}
访问此http://stackoverflow.com/questions/9975562/how-to-pause-play-nstimer –