Question

我是一名业余ios开发人员，拥有版本4.6的xcode和OSX 10.8.4。我正在尝试创建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，我收到此消息：

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

我的应用也不会推出。

以下是我的视图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controller.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

Answer 1

问题是pathForResource正在返回零。您是否已将确切的文件名添加到捆绑包中？

此外，在继续加载播放器之前，您应该测试stringPath和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");
}

iOS应用程序崩溃 - [NSURL initFileURLWithPath：]

1 个答案: