如何在iOS中暫停音頻及其定時器滑塊？

Question

我正在使用AVAudioPlayer類播放音頻。我已經實現了一個隨着音樂播放而進步的定時器滑塊。

這裏是我的代碼：

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 

    AudioBool = YES; 
} 

- (IBAction)play:(id)sender 
{ 
    // Code to read the file from resource folder and sets it in the AVAudioPlayer 

    // Sets the audio timer in 1 sec intervals 
    sliderTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTime) userInfo:nil repeats:YES]; 

    // Sets the slider maximum value 
    slider.maximumValue = player.duration; 

    // Sets the valueChanged target 
    [slider addTarget:self action:@selector(sliderChanged :) forControlEvents : UIControlEventValueChanged]; 

    // Play the audio 
// [player prepareToPlay]; 
    [player play]; 
    if(AudioBool == YES) 
    { 
     [player play]; 
     AudioBool = NO; 
    } 
    else 
    { 
     [player pause]; 
     AudioBool = YES; 
    } 
} 

- (void)updateTime 
{ 
    // Updates the slider about the music time 
    slider.value = player.currentTime; 

    NSString *time = [self timeFormatted:slider.value]; 

    self.timerLabe.text = time; 
} 

- (NSString *)timeFormatted:(int)totalSeconds 
{ 

    int seconds = totalSeconds % 60; 
    int minutes = (totalSeconds/60) % 60; 
    //int hours = totalSeconds/3600; 

    //return [NSString stringWithFormat:@"%02d:%02d:%02d",hours, minutes, seconds]; 

    return [NSString stringWithFormat:@"%02d:%02d", minutes, seconds]; 
} 

- (IBAction)sliderChanged : (UISlider *)sender 
{ 
    // skips music with slider changged 
    [player pause]; 
    [player setCurrentTime:slider.value]; 
// [player prepareToPlay]; 
    [player play]; 
} 


// Stops the timer when audio finishes 
- (void)audioPlayerDidFinishPlaying : (AVAudioPlayer *)player successfully : 
(BOOL)flag  
{ 
    // Music completed 
    if (flag) 
    { 
     [sliderTimer invalidate]; 
    } 
} 

2個問題，我有：

1. 我似乎無法暫停音頻。當我重新點擊播放按鈕時，它會在開始時重新啓動音頻，而不是暫停播放。

2. 該滑塊也重新開始而不是暫停。

如何解決這些問題？

感謝

Answer 1

嘗試此解決方案，您需要根據IsPlaying模塊屬性（在你的代碼AudioBool屬性）

#import <AVFoundation/AVFoundation.h> 

@interface ViewController() 

@property (nonatomic, strong) AVAudioPlayer *audioPlayer; 
@property (nonatomic) BOOL isPlaying; 
@property (nonatomic, strong) NSTimer *sliderTimer; 
@property (weak, nonatomic) IBOutlet UISlider *slider; 
@property (weak, nonatomic) IBOutlet UILabel *timerLabel; 

@end 

@implementation ViewController 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 

    NSBundle *mainBundle = [NSBundle mainBundle]; 
    NSString *filePath = [mainBundle pathForResource:@"10101" ofType:@"mp3"]; 
    NSURL *fileURL = [NSURL fileURLWithPath:filePath]; 

    self.isPlaying = NO; 

    NSError *error; 
    self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:&error]; 
    [self.audioPlayer prepareToPlay]; 

    [self.slider addTarget:self action:@selector(sliderChanged:) forControlEvents:UIControlEventValueChanged]; 

    self.slider.minimumValue = 0; 
    self.slider.maximumValue = self.audioPlayer.duration; 
} 

- (IBAction)play:(id)sender { 

    if (self.isPlaying) 
    { 
     // Music is currently playing 
     [self.audioPlayer pause]; 
     self.isPlaying = !self.isPlaying; 
    } 
    else 
    { 
     // Music is currenty paused/stopped 
     [self.audioPlayer play]; 
     self.isPlaying = !self.isPlaying; 
     self.sliderTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTime) userInfo:nil repeats:YES]; 
    } 
} 

- (void)sliderChanged:(UISlider *)sender 
{ 
    // skips music with slider changged 
    [self.audioPlayer pause]; 
    [self.audioPlayer setCurrentTime:self.slider.value]; 
    [self.audioPlayer play]; 
} 

- (void)updateTime 
{ 
    // Updates the slider about the music time 
    self.slider.value = self.audioPlayer.currentTime; 

    NSString *time = [self timeFormatted:self.slider.value]; 
    self.timerLabel.text = time; 
} 

- (NSString *)timeFormatted:(int)totalSeconds 
{ 

    int seconds = totalSeconds % 60; 
    int minutes = (totalSeconds/60) % 60; 

    return [NSString stringWithFormat:@"%02d:%02d", minutes, seconds]; 
} 



// Stops the timer when audio finishes 
- (void)audioPlayerDidFinishPlaying : (AVAudioPlayer *)player successfully:(BOOL)flag 
{ 
    // Music completed 
    if (flag) 
    { 
     [self.sliderTimer invalidate]; 
    } 
} 

，使在播放方法暫停改變basically..shift在viewDidLoad中的滑塊初始化還播放/