我正在使用以下代码显示时间...我在viewController中有滚动视图...这里我显示的时间从00:00.00开始(mm:ss:SS)(分钟:秒:毫秒)并且目标是递增毫秒,秒基于毫秒,基于秒的分钟...但我想显示从75:00.00(mm:ss:SS)开始的时间,我想将毫秒,秒和分钟减少到00:00.00(mm:ss) .SS)......我怎么能......？
我在以下链接中已经在SO中询问过这个问题.NSTimer以秒/毫秒减少时间
我按照那段代码时间不计算(在后台也是)当我拖动并按住滚动视图而不释放鼠标点击...帮我修改下面的代码...
enter code here
@interface ViewController : UIViewController
{
IBOutlet UILabel *time;
NSTimer *stopWatchTimer;
NSDate *startDate;
NSTimeInterval secondsAlreadyRun;
}
- (void)reset:(id)sender;
- (void)onStartPressed:(id)sender;
- (void)onStopPressed:(id)sender;
enter code here
-(void)showActivity:(NSTimer *)tim
{
NSDate *currentDate = [NSDate date];
NSTimeInterval timeInterval = [currentDate timeIntervalSinceDate:startDate];
// Add the saved interval
timeInterval += secondsAlreadyRun;
NSDate *timerDate = [NSDate dateWithTimeIntervalSince1970:timeInterval];
static NSDateFormatter * dateFormatter = nil;
if( !dateFormatter ){
dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"mm:ss.SS"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
}
NSString *timeString=[dateFormatter …这是我的iPhone秒表代码.它按预期工作,并在单击按钮时停止并恢复.
然而,当我点击"停止"时,计时器将不会在后台停止运行,当我点击"开始"恢复它时,它将更新时间并跳到当前的位置,而不是从停止的时间恢复.
我怎么能阻止NSTimer？是什么导致这种情况发生？
@implementation FirstViewController;
@synthesize stopWatchLabel;
NSDate *startDate;
NSTimer *stopWatchTimer;
int touchCount;
-(void)showActivity {
NSDate *currentDate = [NSDate date];
NSTimeInterval timeInterval = [currentDate timeIntervalSinceDate:startDate];
NSDate *timerDate = [NSDate dateWithTimeIntervalSince1970:timeInterval];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"mm:ss.SS"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
NSString *timeString=[dateFormatter stringFromDate:timerDate];
stopWatchLabel.text = timeString;
[dateFormatter release];
}
- (IBAction)onStartPressed:(id)sender {
stopWatchTimer = [NSTimer scheduledTimerWithTimeInterval:1/10 target:self selector:@selector(showActivity) userInfo:nil repeats:YES];
touchCount += 1;
if (touchCount > 1)
{
[stopWatchTimer fire];
}
else
{
startDate = [[NSDate date]retain]; …