背景音乐:http://www.cnblogs.com/jiayongqiang/p/5476069.html
音效:
一.介绍:
又称“短音频”，通常在程序中的播放时长为1~2秒.最长可以播放29.9s.
在最后会讲解如何将长音乐MP3格式,制作成xcode能识别的音效格式(wav/aac/m4a等等).
二、音效的播放
1.获得音效文件的路径
NSURL *url = [[NSBundle mainBundle] URLForResource:@"m_03.wav" withExtension:nil];
2.加载音效文件，得到对应的音效ID
SystemSoundID soundID = 0;
AudioServicesCreateSystemSoundID((__bridge CFURLRef)(url), &soundID);
3.播放音效
AudioServicesPlaySystemSound(soundID);
注意：音效文件只需要加载1次
4.音效播放常见函数总结
加载音效文件 AudioServicesCreateSystemSoundID(CFURLRef inFileURL, SystemSoundID *outSystemSoundID)
释放音效资源 AudioServicesDisposeSystemSoundID(SystemSoundID inSystemSoundID)
播放音效 AudioServicesPlaySystemSound(SystemSoundID inSystemSoundID)
播放音效带点震动 AudioServicesPlayAlertSound(SystemSoundID inSystemSoundID)
#import "ViewController.h" //1.导入框架
#import <AVFoundation/AVFoundation.h> @interface ViewController () //2.定义一个SystemSoundID属性
@property (nonatomic, assign) SystemSoundID soundID;
@end @implementation ViewController //3.懒加载SoundID
- (SystemSoundID)soundID {
if (_soundID == ) {
// 3.1.获取资源的URL,音频文件要放在黄色文件夹中
NSURL *buyaoUrl = [[NSBundle mainBundle] URLForResource:@"buyao.wav" withExtension:nil]; // 3.2给SoundID赋值
AudioServicesCreateSystemSoundID((__bridge CFURLRef)(buyaoUrl), &_soundID);
}
return _soundID;
} - (void)viewDidLoad {
[super viewDidLoad];
} - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
// 4.1.播放音效，没有振动效果
AudioServicesPlaySystemSound(self.soundID);
// 4.2.播放音效，在真机上带有振动效果
// AudioServicesPlayAlertSound(soundID);
}
三.将播放音效的功能封装成一个工具类.
1.创建一个类PQAudioTool继承自NSObject.
PQAudioTool.h文件:
#import <Foundation/Foundation.h> @interface PQAudioTool : NSObject
/**
* 播放音效
* @param soundName 音效名称
*/
+ (void)audioToolPlaySoundWithName:(NSString *)soundName;
/**
* 销毁音效
* @param soundName 音效名称
*/
+ (void)audioToolDisposeSoundWihtName:(NSString *)soundName;
@end
PQAudioTool.m文件:
#import "PQAudioTool.h"
#import <AVFoundation/AVFoundation.h> @interface PQAudioTool()
//在此处定义一个成员属性. 那么在类方法中无法取到.所以需要定义一个静态成员属性.
@end @implementation PQAudioTool //定义一个静态成员属性,会一直保存在内存中.属于类的. 不属于哪一个对象的.
//定义一个字典放赋值的soundID.
static NSMutableDictionary *_soundIDs;
+ (void)initialize {//该方法只会调用一次(前提是该类没有子类).
_soundIDs = [NSMutableDictionary dictionary];
}
+ (void)audioToolPlaySoundWithName:(NSString *)soundName {
// 1.从字典中取出音效的ID
SystemSoundID soundID = [_soundIDs[soundName] unsignedIntValue];
// 2.如果现在取出来的值是0
if (soundID == ) {
// 2.1.获取资源的URL
NSURL *buyaoUrl = [[NSBundle mainBundle] URLForResource:soundName withExtension:nil];
// 2.2.给SoundID赋值
AudioServicesCreateSystemSoundID((__bridge CFURLRef)(buyaoUrl), &soundID);
// 2.3.放入字典中
_soundIDs[soundName] = @(soundID);
}
// 3.播放音效
AudioServicesPlaySystemSound(soundID);
}
+ (void)audioToolDisposeSoundWihtName:(NSString *)soundName {
// 1.从字典中取出音效的ID
SystemSoundID soundID = [_soundIDs[soundName] unsignedIntValue];
// 2.如果soundID有值，则销毁音效
if (soundID) {
AudioServicesDisposeSystemSoundID(soundID);
}
}
@end在viewController里调用
- (IBAction)buyaoClick:(id)sender {
[PQAudioTool audioToolPlaySoundWithName:@"1-02 何かがおかしい.m4a"];
}
- (IBAction)oneClick:(id)sender {
[PQAudioTool audioToolPlaySoundWithName:@"lose.aac"];
}
- (IBAction)twoClick:(id)sender {
[PQAudioTool audioToolPlaySoundWithName:@"m_04.wav"];
}四:将长音乐制作成小于30s的音效 1.打开iTunes
2.将需要制作的音乐导入iTunes
3.在iTunes中选择音乐-->右击-->显示简介
4.选择选项卡-->设置开始/结束时间-->好
5.选中音乐-->文件-->转换-->AAC
6.成功.直接将转换好的短音乐 拖拽出来即可使用.