按秒倒数计时器
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【中文标题】按秒倒数计时器【英文标题】:push seconds to countdown timer 【发布时间】:2012-06-27 20:20:20 【问题描述】:我创建了一个显示在标签上的倒数计时器,现在我想添加一个功能,当用户按下按钮时,它将向倒数计时器添加 30 秒。 我试图自己做,但我没有成功(我遇到了一个错误,有一次它停止了我的计时器)我该怎么做? 这是我的代码:
-(IBAction)start:(id)sender
timer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];
-(void)updateTimer:(NSTimer *)timer
currentTime -= 10 ;
[self populateLabelwithTime:currentTime];
if(currentTime <=0)
[timer invalidate];
//some code when countdown reach to 00:00:00
- (void)populateLabelwithTime:(int)milliseconds
seconds = milliseconds/1000;
minutes = seconds / 60;
seconds -= minutes * 60;
NSString * countdownText = [NSString stringWithFormat:@"%@%02d:%02d:%02d", (milliseconds<0?@"-":@""), minutes, seconds,milliseconds%1000];
countdownLabel.text = countdownText;
-(IBAction)addTime:(id)sender
timer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(addToCurrent:) userInfo:nil repeats:YES];
-(void) addToCurrent:(NSTimer *)timerb;
seconds +=10;
[self populateLabelWithTime:seconds];
- (void)viewDidLoad
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
currentTime = 2700;
谢谢!
【问题讨论】:
准确地列出问题所在以及您遇到的错误是很有帮助的。-(IBAction)addTime:(id)sender currentTime += 30000;
【参考方案1】:
无需在每次单击按钮时重新创建计时器。此外,在我看来,当您尝试将 30 秒添加回计时器时,您不小心修改了秒数而不是 currentTime。
-(IBAction)addTime:(id)sender
currentTime += 30000;
[self populateLabelWithTime:currentTime];
【讨论】:
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