Question

我需要你的帮助。问题：有一个数组，其中对象4，当你按下播放声音时我有一个按钮并改变（+1）数组的索引=＆gt;当用户第二次点击时，声音应该以索引“2”等播放。问题是索引不会改变，并播放索引为“1”的文件。

*的·H

@interface AZViewController : UIViewController

{

    NSInteger _acatindex;
}

@property (weak, nonatomic) NSMutableArray *acat;

- (IBAction)catbutt:(id)sender;

*的的.m

- (void)viewDidLoad
{
    [super viewDidLoad];

    //array

    NSMutableArray *acat = [NSMutableArray arrayWithObjects:@"cat1", @"cat2", @"cat3", @"cat4", nil];

    NSURL *url = [[NSBundle mainBundle] URLForResource:[acat objectAtIndex:_acatindex] withExtension:@"wav"];
    NSAssert(url, @"URL is valid.");
    NSError* error = nil;
    self.catplayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
    if(!self.catplayer)
    {
        NSLog(@"Error creating player: %@", error);
    }

}
    //button action
- (IBAction)catbutt:(id)sender
{    
    _acatindex++;
    if (_acatindex == _acat.count)
    {
        _acatindex = 0;
    }

    AZTrace();
    [self.catplayer stop];
    [self stopTimer];
    self.catplayer.currentTime = 0;
    [self.catplayer prepareToPlay];

    AZTrace();
    [self.catplayer play];
    self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(timerFired:) userInfo:nil repeats:YES];
}

Answer 1

您只能在-viewDidLoad:方法中加载网址。您需要告诉音频播放器在-catbutt:方法中播放数组中的下一个声音。您正在停止播放器，但在重新启动之前，您没有更改正在播放的文件。

Answer 2

删除以下行：

    [acat addObject:@"cat1"];
    [acat addObject:@"cat2"];
    [acat addObject:@"cat3"];
    [acat addObject:@"cat4"];

声明您的数组和NSURL不在viewDidLoad中，请在.h中执行此操作：

@interface AZViewController : UIViewController

{

    NSInteger _acatindex;
     NSMutableArray *acat;
    NSURL *url;
}

@property (weak, nonatomic) NSMutableArray *acat;

- (IBAction)catbutt:(id)sender;

现在从viewDidLoad()：

中删除以下代码

url = [[NSBundle mainBundle] URLForResource:[acat objectAtIndex:_acatindex] withExtension:@"wav"];
    NSAssert(url, @"URL is valid.");
    NSError* error = nil;

self.catplayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
    if(!self.catplayer)
    {
        NSLog(@"Error creating player: %@", error);
    }

并将其粘贴到- (IBAction)catbutt:(id)sender

上方_acatindex++;

希望这会有所帮助。

数组中的objective-c索引

2 个答案: