Objective-C：完成一个间隔计时器
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【中文标题】Objective-C：完成一个间隔计时器【英文标题】：Objective-C: Completing an interval timer 【发布时间】：2014-01-17 04:51:08 【问题描述】：我目前正在开发一个间隔计时器，它可能会让您想到 Gymboss 计时器。比较到此结束。
假设您使用踏步机将整个锻炼时间设置为 10 分钟。您希望每次重复持续 1 分钟，每次休息 30 秒。虽然我设法在“计时”方法中编写了将在锻炼结束时播放的声音，但我仍在努力在重复或休息结束时播放声音。这是代码中标题的相关部分：
#import <AudioToolbox/AudioToolbox.h>
@interface AutoLayoutViewController : UIViewController <AVAudioPlayerDelegate>
// 1. The three green labels
// Workout's timer
IBOutlet UILabel *workoutTimer;
NSTimer *workoutCountdown;
// Repetition's length
@property (strong, nonatomic) IBOutlet UILabel *repetitionLabel;
// Break's length
@property (strong, nonatomic) IBOutlet UILabel *breakLabel;
// 2. The three steppers
// Stepper for Workout's total length
@property (strong, nonatomic) IBOutlet UIStepper *secondsWorkoutChanged;
// Stepper for Repetition's length
@property (strong, nonatomic) IBOutlet UIStepper *secondsRepetitionChanged;
// Stepper for Break's length
@property (strong, nonatomic) IBOutlet UIStepper *secondsBreakChanged;
// 4. The start button
@property (strong, nonatomic) IBOutlet UIButton *startPauseButton;
@end
其次，这是实现文件的相关部分：
// 1. Steppers
// Stepper for Workout's length
- (IBAction)secondsWorkoutChanged:(UIStepper *)sender
/* User increases value of seconds with stepper. Whenever variable for seconds is equal or greater than 60, the program sets the value of minutes through this division: seconds / 60. */
seconds = [sender value];
minutes = seconds / 60;
/* "If" statement for resetting seconds to 0 in order for the label to look like a watch. REAL number of seconds stored by stepper modulus operated by 60.
*/
if (seconds > 59)
seconds = seconds % 60;
// End if.
[workoutTimer setText: [NSString stringWithFormat:@"%2i : %2i", (int) minutes, (int) seconds]];
// Stepper for Repetition's length
- (IBAction)secondsRepetitionChanged:(UIStepper *)sender
/* User increase value of secondsBreak with stepper. Whenever variable for secondsBreak exceeds 60, the program sets the value of minutesBreak by dividing the number of seconds with 60. */
secondsRepetition = [sender value];
minutesRepetition = secondsRepetition / 60;
/* "If" statement for resetting secondsBreak to 0 in order for the label to look like a watch. REAL number of seconds stored by stepper modulus operated by 60.
*/
if (secondsRepetition > 59)
secondsRepetition = secondsRepetition % 60;
// End if.
[_repetitionLabel setText: [NSString stringWithFormat:@"%2i : %2i", (int) minutesRepetition, (int) secondsRepetition]];
// Stepper for Break's length
- (IBAction)secondsBreakChanged:(UIStepper *)sender
/* User increase value of secondsBreak with stepper. Whenever variable for secondsBreak exceeds 60, the program sets the value of minutesBreak by dividing the number of seconds with 60. */
secondsBreak = [sender value];
minutesBreak = secondsBreak / 60;
/* "If" statement for resetting secondsBreak to 0 in order for the label to look like a watch. REAL number of seconds stored by stepper modulus operated by 60.
*/
if (secondsBreak > 59)
secondsBreak = secondsBreak % 60;
// End if.
[_breakLabel setText: [NSString stringWithFormat:@"%2i : %2i", (int) minutesBreak, (int) secondsBreak]];
// 3. The buttons
// Method for countdown
- (void)chrono:(NSTimer *)timer
// First brace for "chrono" method.
// Timer loses 1 second when started.
seconds = seconds -= 1;
workoutTimer.text = [NSString stringWithFormat: @"%2i : %2i", minutes, seconds];
// If "statement for including minutes in countdown.
if (seconds <= 0)
if (minutes <= 0)
[workoutCountdown invalidate]; // 1: If both minutes and seconds = 0, countdown ends.
// 1.1: Alarm for end of workout.
CFBundleRef workoutEnded = CFBundleGetMainBundle();
CFURLRef soundFileURLRef;
soundFileURLRef = CFBundleCopyResourceURL(workoutEnded, (CFStringRef) @"alarm_clock_ringing", CFSTR ("wav"), NULL);
UInt32 soundID;
AudioservicesCreateSystemSoundID(soundFileURLRef, &soundID);
AudioServicesPlaySystemSound(soundID);
// Reset all steppers when workout ends.
_secondsWorkoutChanged.value = 0;
_secondsRepetitionChanged.value = 0;
_secondsBreakChanged.value = 0;
// Reset the text displayed in the label to zero.
[workoutTimer setText:@"00 : 00"];
[_repetitionLabel setText:@"00 : 00"];
[_breakLabel setText:@"00 : 00"];
// End of "if" statement" for minutes.
else // Timer still running
seconds = 60;
minutes -= 1;
// End of else.
// End of all the "if" (general).
// Last brace for "chrono" method.
//Start button
-(IBAction) startPauseButton:(UIButton *)sender
workoutCountdown = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(chrono:) userInfo:nil repeats:YES];
我的问题如下。当重复和中断结束时，如何播放声音？出于演示的目的，您可以使用来自“chrono”方法的声音的代码行。
谢谢。
安科
【问题讨论】：
嗨。你能澄清一下 repitition 和 break 的术语吗？所有的计时器都应该同时开始吗？如果可能，请通过示例提供计时器的工作流程。 假设用户正在做仰卧起坐。他的整个锻炼时间为10分钟。在他按下“开始”按钮一分钟后，他会听到第一个警报（重复），告诉他/她停止他的仰卧起坐。在第一个警报后 30 秒，他/她将听到另一个警报告诉他/她休息结束。之后，两个警报将在一个循环中相互跟随，直到锻炼结束。我确信我必须在“chrono”方法中设置一个循环才能发生这种情况。 这是我目前所了解的。重复警报确定您在一次连续拉伸或一组中锻炼多长时间。休息警报设置休息时间。当重复计时器达到零倒计时时，总锻炼计时器暂停。此时，重复警报被重置为其原始值并且中断计时器启动。当休息计时器达到零时，锻炼计时器和重复计时器开始其下一个循环。到目前为止我是对的吗？ 在锻炼期间，除非用户按下“暂停”按钮，否则“总锻炼计时器”将继续运行。至于其他两个组件，当重复计时器达到零时，警报将重置为其原始值，并且休息计时器启动。当中断计时器达到零时，重复计时器和中断计时器进入下一个循环。到目前为止，这就是我项目的全貌。 【参考方案1】：尝试在您的实施文件中实施以下更改：
[ 注意：我重新定位了变量的声明语句，并添加了两个新的变量secondsValue和minutesValue]
@implementation CDTViewController
// instance variables
int seconds;
int minutes;
int secondsRepetition;
int minutesRepetition;
int secondsBreak;
int minutesBreak;
int secondsValue;
int minutesValue;
BOOL startBreakTimer;
BOOL startRepetitionTimer;
- (void)viewDidLoad
[super viewDidLoad];
startRepetitionTimer = YES;
startBreakTimer = NO;
- (IBAction)secondsRepetitionChanged:(UIStepper *)sender
minutesRepetition = [sender value] / 60;
secondsRepetition = (int)[sender value] % 60;
secondsValue = secondsRepetition;
minutesValue = minutesRepetition;
[_repetitionLabel setText: [NSString stringWithFormat:@"%2i : %2i", (int) minutesRepetition, (int) secondsRepetition]];
- (IBAction)secondsBreakChanged:(UIStepper *)sender
minutesBreak = [sender value] / 60;
secondsBreak = (int)[sender value] % 60;
[_breakLabel setText: [NSString stringWithFormat:@"%2i : %2i", (int) minutesBreak, (int) secondsBreak]];
- (void)chrono:(NSTimer *)timer
seconds -= 1;
secondsValue -= 1;
if (seconds < 0)
seconds = 59;
minutes -= 1;
if (minutes < 0)
minutes = 0;
if (secondsValue < 0)
secondsValue = 59;
minutesValue -= 1;
if (minutesValue < 0)
minutesValue = 0;
workoutTimer.text = [NSString stringWithFormat: @"%2i : %2i", minutes, seconds];
if (startRepetitionTimer)
_repetitionLabel.text = [NSString stringWithFormat: @"%2i : %2i",minutesValue, secondsValue];
_breakLabel.text = [NSString stringWithFormat: @"%2i : %2i", minutesBreak, secondsBreak];
if (secondsValue == 0)
if (minutesValue == 0)
startBreakTimer = YES;
startRepetitionTimer = NO;
secondsValue = secondsBreak;
minutesValue = minutesBreak;
/* write code to play repetition alarm
here */
else if (startBreakTimer)
_repetitionLabel.text = [NSString stringWithFormat: @"%2i : %2i",minutesRepetition, secondsRepetition];
_breakLabel.text = [NSString stringWithFormat: @"%2i : %2i", minutesValue, secondsValue];
if (secondsValue == 0)
if (minutesValue == 0)
startBreakTimer = NO;
startRepetitionTimer = YES;
secondsValue = secondsRepetition;
minutesValue = minutesRepetition;
/* write code to play break alarm
here */
if (seconds == 0)
if (minutes == 0)
[workoutCountdown invalidate];
// Alarm for end of workout.
// Reset all steppers when workout ends.
_secondsWorkoutChanged.value = 0;
_secondsRepetitionChanged.value = 0;
_secondsBreakChanged.value = 0;
// Reset the text displayed in the label to zero.
[workoutTimer setText:@"00 : 00"];
[_repetitionLabel setText:@"00 : 00"];
[_breakLabel setText:@"00 : 00"];
return;
希望这个逻辑对你有帮助！
【讨论】：
再次感谢您的回答！我测试了你在 iOS 模拟器中描述的逻辑，它可以工作。以上是关于Objective-C：完成一个间隔计时器的主要内容，如果未能解决你的问题，请参考以下文章