从 UIPicker 更改音频文件
我有一个 UIPickerView 设置并运行良好。当用户选择一行时，我希望启动一个音频文件，但是如果用户在第一个音频文件停止播放之前选择另一行，我希望它停止第一个音频文件，只让新的音频文件播放。 我目前可以使用下面的代码来做到这一点，但是两个文件同时播放，我找不到停止第一个文件的方法。
我是不是走错路了？ （我是 SDK 编码的新手）
任何想法将不胜感激 谢谢
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
return 1;
}
-(NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component{
return [list count];
}
-(NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [list objectAtIndex:row];
}
-(void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
NSString *string = [NSString stringWithFormat:@"%@", [list2 objectAtIndex:row]];
pickLabel.text = string;
if(row == 1){
NSString *path = [[NSBundle mainBundle]
pathForResource:@"del08sample"ofType:@"mp3"];
AVAudioPlayer* theAudio = [[AVAudioPlayer alloc]
initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
[theAudio play];
}
else if (row == 2){
NSString *path = [[NSBundle mainBundle]
pathForResource:@"icgi03sample"ofType:@"mp3"];
AVAudioPlayer* theAudio = [[AVAudioPlayer alloc]
initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
[theAudio play];
}
}
I have a UIPickerView set up and running fine. When the user selects a row I want one audio file to start but then if the user selects another row before the first audio file has stopped playing I want it to stop the first and just let the new audio file play.
I can do it at present with the code below but both files play at the same time and I cannot find a way of stopping the first one.
Am I going about the wrong way? (I am new to SDK coding)
Any ideas would be appreciated
Thanks
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
return 1;
}
-(NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component{
return [list count];
}
-(NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [list objectAtIndex:row];
}
-(void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
NSString *string = [NSString stringWithFormat:@"%@", [list2 objectAtIndex:row]];
pickLabel.text = string;
if(row == 1){
NSString *path = [[NSBundle mainBundle]
pathForResource:@"del08sample"ofType:@"mp3"];
AVAudioPlayer* theAudio = [[AVAudioPlayer alloc]
initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
[theAudio play];
}
else if (row == 2){
NSString *path = [[NSBundle mainBundle]
pathForResource:@"icgi03sample"ofType:@"mp3"];
AVAudioPlayer* theAudio = [[AVAudioPlayer alloc]
initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
[theAudio play];
}
}
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我还没有用您的代码对此进行测试，但是当我需要这样做时，我添加一个简单的检查来查看
如果已经有一个 AVAudioPlayer 正在播放，请在重新分配之前停止它。 Apple 的 AVAudioPlayer 类参考 有一个也有很多有用的信息。
I haven't tested this with your code, but when I need to do this I add a simple check to see
if there is already an AVAudioPlayer that is playing and stop it before re-allocating. Apple's AVAudioPlayer Class Reference has a whole host of useful info too.