1

我是一名业余 ios 开发人员，拥有 xcode 4.6 版和 OSX 10.8.4。我正在尝试制作一个播放声音的应用程序，但是当我尝试运行该应用程序时，我收到以下消息：

* 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“* - [NSURL initFileURLWithPath:]: nil string parameter”

我的应用程序也不会启动。

这是我的视图 controller.h 的代码：

      ViewController.h:

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


@interface ViewController : UIViewController 



- (IBAction)playButton:(id)sender;
- (IBAction)stopButton:(id)sender;

@end

这是我的视图控制器.m：

      Viewcontroller.m:


#import "ViewController.h"
#import <RevMobAds/RevMobAds.h>


@interface ViewController ()
{
AVAudioPlayer *avPlayer;
}
@end

@implementation ViewController 
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSString *stringPath = [[NSBundle mainBundle]pathForResource:@"98648__dobroide__20100606-mosquito" ofType:@"mp3"];

NSURL *url = [NSURL fileURLWithPath:stringPath];

NSError *error;

avPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error];

[avPlayer setNumberOfLoops:-1];


}

- (void)didReceiveMemoryWarning{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.

 }


- (IBAction)playButton:(id)sender {
[avPlayer play];
}

- (IBAction)stopButton:(id)sender {
[avPlayer pause];

}
@end
4

1 回答 1

6

问题pathForResource是返回零。您是否已将确切的文件名添加到您的捆绑包中？

此外，您应该在继续加载播放器之前stringPath进行测试。error例如：

NSString *stringPath = [[NSBundle mainBundle]pathForResource:@"98648__dobroide__20100606-mosquito" ofType:@"mp3"];
if (stringPath) {
    NSURL *url = [NSURL fileURLWithPath:stringPath];
    NSError *error;
    avPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error];
    if (!error) {
        [avPlayer setNumberOfLoops:-1];
    } else {
        NSLog(@"Error occurred: %@", [error localizedDescription]);
    }
} else {
    NSLog(@"Resource not found");
}
于 2013-09-01T15:44:43.710 回答