推送视图控制器后播放 mp3 的问题

Posted 2023-02-25

【中文标题】推送视图控制器后播放 mp3 的问题

【英文标题】：problem play an mp3 after pushing viewcontroller

【发布时间】：2011-02-28 20:27:41

【问题描述】：

在我的 tableViewController 上

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 

我推送我的视图控制器

        [self.navigationController pushViewController:[[[UIViewController alloc] initWithNibName:@"myViewController" bundle:nil] autorelease] animated:YES];

在 myViewController 我已经导入 AVFoundation 并通过 IB 添加三个按钮来播放/暂停/停止歌曲

myViewController.h
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>

@interface fotos : UIViewController <AVAudioPlayerDelegate> 
AVAudioPlayer *player;

@property (nonatomic, retain) AVAudioPlayer *player;

-(IBAction)play:(id)sender;
-(IBAction)pause:(id)sender;
-(IBAction)stop:(id)sender;

我已经以这种方式实现了

myViewController.m
@implementation fotos
@synthesize player;

- (void)viewDidLoad 
[super viewDidLoad];
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"peter"                                                          
ofType:@"mp3"];

NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:filePath];

player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
player.delegate = self;
[player prepareToPlay];
[filePath release];
[fileURL release];  


-(IBAction)play:(id)sender 

if(!player.playing)

 [player play];



-(IBAction)pause:(id)sender 
[player pause];


-(IBAction)stop:(id)sender 
[player stop];

我已经在 IB 中连接了我的操作，但是当我尝试播放我的文件时，我得到了

 *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-    
[UIViewController play:]: unrecognized selector sent to instance 0x5619e70'
*** Call stack at first throw:
(
0   CoreFoundation                      0x01009be9 __exceptionPreprocess + 185
1   libobjc.A.dylib                     0x0115e5c2 objc_exception_throw + 47
2   CoreFoundation                      0x0100b6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3   CoreFoundation                      0x00f7b366 ___forwarding___ + 966
4   CoreFoundation                      0x00f7af22 _CF_forwarding_prep_0 + 50
5   UIKit                               0x0041ea6e -[UIApplication sendAction:to:from:forEvent:] + 119
6   UIKit                               0x004ad1b5 -[UIControl sendAction:to:forEvent:] + 67
7   UIKit                               0x004af647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
8   UIKit                               0x004ae1f4 -[UIControl touchesEnded:withEvent:] + 458
9   UIKit                               0x004430d1 -[UIWindow _sendTouchesForEvent:] + 567
10  UIKit                               0x0042437a -[UIApplication sendEvent:] + 447
11  UIKit                               0x00429732 _UIApplicationHandleEvent + 7576
12  GraphicsServices                    0x01b18a36 PurpleEventCallback + 1550
13  CoreFoundation                      0x00feb064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
14  CoreFoundation                      0x00f4b6f7 __CFRunLoopDoSource1 + 215
15  CoreFoundation                      0x00f48983 __CFRunLoopRun + 979
16  CoreFoundation                      0x00f48240 CFRunLoopRunSpecific + 208
17  CoreFoundation                      0x00f48161 CFRunLoopRunInMode + 97
18  GraphicsServices                    0x01b17268 GSEventRunModal + 217
19  GraphicsServices                    0x01b1732d GSEventRun + 115
20  UIKit                               0x0042d42e UIApplicationMain + 1160
21  Training Cocoa                      0x00001bc4 main + 102
22  Training Cocoa                      0x00001b55 start + 53
)
terminate called after throwing an instance of 'NSException'

我也尝试在 viewDidLoad 中播放，但没有。

有什么建议吗？ 谢谢

【参考方案1】：

由于播放器是一个属性，请尝试通过[self player] 引用它

所以你可能有[[self player] play];

【讨论】：

谢谢，很好的回复。我注意到我的新手错误，现在我创建了一个引用 myViewController 的 viewController 并且所有工作 myViewController *myC = [[myViewController alloc] initWithNib ....] 并推送 myC。