添加一个倒计时，显示时间和触发一个动作

Question

嗨，我在编程初学者

我已经创建了一个窃听程序，按结果按钮

我想补充后显示抽头数NSTimer，在第一次敲击30秒后（在第一次按下敲击按钮之后）计数。

的同时，显示时间倒计时的标签上（的UILabel timeLabel）

并在30秒，抽头数将重新启动为0

烦请告诉我，如果我需要发布以下任何内容，谢谢！

这里是我的.h文件

#import <UIKit/UIKit.h> 
#import <AVFoundation/AVAudioPlayer.h> 
#import <AudioToolbox/AudioToolbox.h> 

@class Player; 
@interface Tapping2ViewController : UIViewController 
<AVAudioPlayerDelegate> 

{ 
    Player *aPlayer; 
    IBOutlet UILabel *timerLabel; 
    IBOutlet UILabel *resultLabel; 
    AVAudioPlayer *buttonPlayer; 
    NSTimer *lv1Timer; 
    NSInteger *counter1; 

} 
- (IBAction)addTap:(id)sender; 
- (IBAction)getResult:(id)sender; 

-(void)restartTapCount; 
-(void)start; 

@property (retain) NSTimer *lv1Timer; 
@property (nonatomic, retain) IBOutlet UILabel *timerLabel; 

@end 

和我的.m文件

#import "Tapping2ViewController.h" 
#import "Player.h" 


@implementation Tapping2ViewController 

@synthesize lv1Timer; 
@synthesize timerLabel; 

- (id) initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil 
       bundle:nibBundleOrNil]; 
    if (self) { 

    } 
    return self; 
} 


- (void)dealloc 
{ 
    [resultLabel release]; 
    [lv1Timer release]; 
    [aPlayer release]; 
    [timerLabel release]; 
    [super dealloc]; 
} 

- (void)didReceiveMemoryWarning 
{ 
    // Releases the view if it doesn't have a superview. 
    [super didReceiveMemoryWarning]; 

    // Release any cached data, images, etc that aren't in use. 
} 

#pragma mark - View lifecycle 


- (void)viewDidLoad 
{ 
    aPlayer = [[Player alloc] init]; 
    [super viewDidLoad]; 
} 



- (IBAction)addTap:(id)sender 

{ 

    //呢到係設定聲音， 首先要用NSSTRING 去 SET 左條路徑先 
    NSString *buttonFile = [[NSBundle mainBundle] pathForResource:@"button" ofType:@"wav"]; 

    //之後再條NSSTRING 轉做NSURL （因為AVPLAYER 只認URL） 
    NSURL *buttonFileURL = [NSURL fileURLWithPath:buttonFile]; 
    NSError *error = nil; 

    //設定AUDIO PLAYER 要播邊條 聲音 ＊記得SET DELEGATE 做自已去執行 
    buttonPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:buttonFileURL error:&error]; 
    [buttonPlayer setDelegate:self]; 

    NSLog(@"Before: %d", aPlayer.tapCount); 
    aPlayer.tapCount++; 

    //呼叫播放既METHOD 
    [buttonPlayer play]; 


    NSLog(@"After: %d", aPlayer.tapCount); 



    /* 
    //即時顯示數字 
    aPlayer.result = aPlayer.tapCount; 

    NSString *sResult = [NSString stringWithFormat:@"%D", aPlayer.result]; 

    resultLabel.text = sResult; 
    */ 
} 



- (IBAction)getResult:(id)sender { 

    aPlayer.result = aPlayer.tapCount; 

    NSString *aResult = [NSString stringWithFormat:@"%D", aPlayer.result]; 

    resultLabel.text = aResult; 

} 


-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event 

{ 
    if (motion == UIEventSubtypeMotionShake) 
    { 
     aPlayer.tapCount = 0; 
     resultLabel.text = @"0"; 
    } 
} 


- (void)viewDidUnload 
{ 

    [resultLabel release]; 
    resultLabel = nil; 
    [timerLabel release]; 
    timerLabel = nil; 
    [super viewDidUnload]; 
    // Release any retained subviews of the main view. 
    // e.g. self.myOutlet = nil; 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    // Return YES for supported orientations 
    return (interfaceOrientation == UIInterfaceOrientationPortrait); 
} 

//下面係PART OF DETECT SHAKE 既METHOD 

-(BOOL)canBecomeFirstResponder 
{ 
    return YES; 
} 


-(void)viewDidAppear:(BOOL)animated 
{ 
[super viewDidAppear:animated]; 
[self becomeFirstResponder]; 
} 

-(void)viewWillDisappear:(BOOL)animated 
{ 
    [self resignFirstResponder]; 
    [super viewWillDisappear:animated]; 
} 

//去到呢到都係 

@end 

Answer 1

这是我如何做，在一个应用程序，在启动：

count = COUNTDOWN_DURATION; 
countdownTimer = [NSTimer scheduledTimerWithTimeInterval:1 
        target:self selector:@selector(countDown) 
        userInfo:nil repeats:YES]; 

这将每秒钟调用一次countDown方法。你想什么在countDown方法但一定要停止NSTimer上完成（当然递减计数器）：

if (count < 0) { 
    [countdownTimer invalidate]; 
    countdownTimer = nil; 
} 
... 
count--;