[英]how I can pause and resume my NSTimer
I have a NSTimer that already works however want to pause it when you click a button. 我有一个已经可以工作的NSTimer,但是当您单击按钮时想暂停它。 This button besides pause redirects me to my other view then when I get back to the home view he has to continue where you left off. 除了暂停,此按钮会将我重定向到其他视图,然后当我返回到主视图时,他必须从您上次停下的地方继续。 I already have the pause button and I intend to continue counting calling a method on viewWillAppear 我已经有了暂停按钮,并且打算继续计算在viewWillAppear上调用方法
this is my code: 这是我的代码:
- (void)viewDidLoad {
[super viewDidLoad];
[self setUp];
}
- (void) setUp {
_startDate = [NSDate date];
_timer = [NSTimer scheduledTimerWithTimeInterval: 1.0/100.0 target: self selector: @selector(timerUpdating) userInfo: nil repeats: true];
}
-(void)timerUpdating {
NSDate *currentDate = [NSDate date];
NSTimeInterval timeInterval = [currentDate timeIntervalSinceDate:_startDate];
NSDate *timerDate = [NSDate dateWithTimeIntervalSince1970:timeInterval];
NSDateFormatter *dateFormater = [[NSDateFormatter alloc]init];
[dateFormater setDateFormat:@"mm:ss"];
[dateFormater setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
NSString *timeString = [dateFormater stringFromDate:timerDate];
self.timerLabel.text = timeString;
self.pauseTimeInterval = &(timeInterval);
}
- (IBAction)timerActionPause:(id)sender {
}
- (void)startTimer {
if(_timer != nil) { // To make sure
[self stopTimer];
}
_timer = [NSTimer scheduledTimerWithTimeInterval: 1.0/100.0 target: self selector: @selector(timerUpdating) userInfo: nil repeats: true];
}
- (void)stopTimer {
[_timer invalidate];
_timer = nil;
}
- (void)resetTimer {
[self stopTimer];
[self startTimer];
}
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