大家好, 请看下面的代码,我希望能够在单击相同的按钮时停止声音,单击另一个按钮,甚至在返回主屏幕时也是如此。不知道该怎么做,
FoxViewController.m
#import "FoxViewController.h"
#import <AVFoundation/AVAudioPlayer.h>
AVAudioPlayer *newPlayer_Fox;
@interface FoxViewController ()
@end
@implementation FoxViewController
-(IBAction) Fox;
{
NSString *soundFilePath = [[NSBundle mainBundle] pathForResource: @"new"ofType: @"mp3"];
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: soundFilePath];
newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: fileURL error: nil];
[newPlayer play];
}
- (id)initWithNibName:(NSString*)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
FoxViewController.h
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>
AVAudioPlayer *newPlayer;
@interface FoxViewController : UIViewController
-(IBAction)Fox;
@end
非常感谢你的帮助,贾斯汀。
答案 0 :(得分:0)
在flag
文件中保留一个BOOL soundPlay
说FoxViewController.h
作为全局变量
现在在FoxViewController.m's viewDidLoad
方法
soundPlay = TRUE;
动作按钮将如下所示:
-(IBAction) Fox;
{
if(soundPlay){
soundPlay = FALSE; //made false for next time another condition will be used.
NSString *soundFilePath = [[NSBundle mainBundle] pathForResource: @"new"ofType: @"mp3"];
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: soundFilePath];
newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: fileURL error: nil];
[newPlayer play];
}
else
{
if([newPlayer isPlaying])
{
[newPlayer stop];
}
}
}
对于stopping sound
中的background
,如果未添加,则添加此方法
-(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
//stop background sound
if([newPlayer isPlaying])
{
[newPlayer stop];
}
}
答案 1 :(得分:0)
总结一下,停止声音文件的句子是:
AudioServicesDisposeSystemSoundID (soundFileObject);
解释(重要的是要理解):
我有一个包含18种不同声音文件的表视图。当用户选择一行必须发出相应的文件时,当选择另一行时,它必须停止前一个声音并播放其他声音。
所有这些都是必要的:
1)在“建立阶段”中添加到项目“AudioToolbox.framework”,在“Link Binary with Libraries”中
2)在头文件中(在我的项目中调用“GenericTableView.h”)添加以下句子:
#include <AudioToolbox/AudioToolbox.h>
CFURLRef soundFileURLRef;
SystemSoundID soundFileObject;
@property (readwrite) CFURLRef soundFileURLRef;
@property (readonly) SystemSoundID soundFileObject;
3)在实现文件中(在我的项目中调用“GenericTableView.m”)添加以下句子:
@synthesize soundFileURLRef;
@synthesize soundFileObject;
在你的“行动”实施中或在我的情况下,在:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
//
// That is the question: a way to STOP sound file
//
// -----------------------------------------------------------------------
// Very important to STOP the sound file
AudioServicesDisposeSystemSoundID (soundFileObject);
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
// In my project "rowText" is a field that save the name of the
// corresponding sound (depending on row selected)
// It can be a string, @"Alarm Clock Bell" in example
// Create the URL for the source audio file.
// URLForResource:withExtension: method is new in iOS 4.0.
NSURL *soundURL = [[NSBundle mainBundle] URLForResource:rowText withExtension:@"caf"];
// Store the URL as a CFURLRef instance
self.soundFileURLRef = (CFURLRef) [soundURL retain];
// Create a system sound object representing the sound file.
AudioServicesCreateSystemSoundID (soundFileURLRef,&soundFileObject);
AudioServicesPlaySystemSound (soundFileObject);
[soundURL release];
}
4)最后,在同一个工具文件中(在我的项目中它调用“GenericTableView.m”):
- (void)dealloc {
[super dealloc];
AudioServicesDisposeSystemSoundID (soundFileObject);
//CFRelease (soundFileURLRef);
}
我必须发表评论“CFRelease(soundFileURLRef)”,因为当用户离开表格视图时,应用程序意外结束。
所有这些代码都是Apple的比例。在此链接中,您甚至可以找到直接在iPhone模拟器中测试的示例代码。