ios - 如何在应用程序启动时播放音频文件

Question

我想在应用程序启动时播放声音，然后让用户有机会通过“停止”按钮暂停声音。我怎样才能做到这一点？

我的实际代码是：

player1 = [[AVAudioPlayer alloc]
          initWithContentsOfURL:[NSURL fileURLWithPath:
          [[NSBundle mainBundle] pathForResource:@"Startsound" ofType:@"m4a"]]error:nil];
player1.numberOfLoops=-1;
[player1 prepareToPlay];

Answer 1

由于这个问题被扭曲了，我确实明白他想说什么。

这就是你的做法。在您的 v1AppDelegate.h 文件中添加

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#include <AudioToolbox/AudioToolbox.h>

@interface v1AppDelegate : UIResponder <UIApplicationDelegate>
{
    AVAudioPlayer *myAudioPlayer;
}

@property (nonatomic, retain) AVAudioPlayer *myAudioPlayer;

@property (strong, nonatomic) UIWindow *window;

@end

现在在你的 v1AppDelegate.m 文件中添加这个

#import "v1AppDelegate.h"
#import <AVFoundation/AVFoundation.h>
#include <AudioToolbox/AudioToolbox.h>

@implementation v1AppDelegate

@synthesize window = _window;

@synthesize myAudioPlayer;


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    //start a background sound
    NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:@"Startsound" ofType: @"m4a"];
    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:soundFilePath ];    
    myAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
    myAudioPlayer.numberOfLoops = -1; //infinite loop
    [myAudioPlayer play];


    // Override point for customization after application launch.
    return YES;
}

如果您希望在代码中的任何其他位置停止或开始播放此音乐，只需添加此

#import "v1AppDelegate.h"    
- (IBAction)stopMusic
    {
        v1AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
        [appDelegate.myAudioPlayer stop];
    }


    - (IBAction)startMusic
    {
        v1AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
        [appDelegate.myAudioPlayer play];
    }