在iOS中以編程方式製作按鈕播放聲音

Question

我想創建一個按鈕，並在觸摸時使其播放聲音。到目前爲止，我可以製作這個按鈕，但是我很難讓它播放聲音。以下是我的：

//loads wav file into SoundID 
NSURL *buttonURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"medic_taunts01" ofType:@"wav"]]; 
AudioServicesCreateSystemSoundID((__bridge CFURLRef)buttonURL, &SoundID); 

//creates button 
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
[button setTitle:@"Show View" forState:UIControlStateNormal]; 
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0); 
[scrollview addSubview:button] 

//this line is the problem 
[button addTarget:self action:@selector(AudioServicesPlaySystemSound((SoundID)) forControlEvents:UIControlEventTouchDown]; 

由於某些原因，xcode不會讓我直接從按鈕單擊播放聲音。我怎樣才能讓觸摸按鈕播放SoundID？

Answer 1

您的按鈕操作方法必須具有以下簽名：

-(void)buttonActionMethod:(id)inSender 

這意味着你不能直接調用的系統方法。對於你正在嘗試做的，我建議這個方法：

//loads wav file into SoundID 
NSURL *buttonURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"medic_taunts01" ofType:@"wav"]]; 
SystemSoundID soundID 
AudioServicesCreateSystemSoundID((__bridge CFURLRef)buttonURL, &soundID); 
self.SoundID = soundID; 

//creates button 
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
[button setTitle:@"Show View" forState:UIControlStateNormal]; 
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0); 
[scrollview addSubview:button] 

//this line is the problem 
[button addTarget:self action:@selector(playButtonSound:) forControlEvents:UIControlEventTouchDown]; 

注SoundID一個屬性（我相信你知道如何使那些）的轉換。然後定義這個方法：

-(void)playButtonSound:(id)inSender { 
    AudioServicesPlaySystemSound(self.SoundID); 
} 

當然，如果你有一個以上的按鈕，每一個不同的聲音，你將需要獲得更多一點創意在這裏與測繪聲音標識的按鈕。

Answer 2

這是你編輯的答案。希望這有助於：

-(void)viewDidLoad { 

     NSURL *buttonURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"medic_taunts01" ofType:@"wav"]]; 
     AudioServicesCreateSystemSoundID((__bridge CFURLRef)buttonURL, &SoundID); 

     //creates button 
     UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
     [button setTitle:@"Show View" forState:UIControlStateNormal]; 
     button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0); 
     [scrollview addSubview:button] 

     //this line was causing problem 
     [button addTarget:self action:@selector(playSound:) forControlEvents:UIControlEventTouchDown]; 


} 


-(void)playSound:(id)sender{ 

     AudioServicesPlaySystemSound((SoundID) 

    }