如何将音频保存到iPhone中的文档？

Question

我尝试录制音频并将其保存到文档文件夹，但该程序只能在模拟器中工作。一旦我在我的iPhone（ios 8.3）中运行它，它就无法工作。我的代码有问题吗？谢谢。

这是h文件：

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import <AVFoundation/AVAudioPlayer.h>
#import <AVFoundation/AVAudioRecorder.h>
#import <Accelerate/Accelerate.h>

@interface ViewController : UIViewController{
    AVAudioPlayer *player;
    AVAudioRecorder *recorder;
}

- (IBAction)REC:(id)sender;
- (IBAction)STOP_and_SAVE:(id)sender;
- (IBAction)PLAY:(id)sender;

@property (nonatomic, strong) NSString *Record_path1_string;


@end

m file：

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}

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

- (IBAction)REC:(id)sender {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    self.Record_path1_string = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"bbb.wav"];
    recorder = [[AVAudioRecorder alloc] initWithURL:[NSURL fileURLWithPath: self.Record_path1_string] settings:nil error:nil];

    [recorder prepareToRecord];
    [recorder record];

    NSLog(@"recording!");
}

- (IBAction)STOP_and_SAVE:(id)sender {
    [recorder stop];
}

- (IBAction)PLAY:(id)sender {
    player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath: self.Record_path1_string] error:nil];
    [player play];
}

@end

我已经检查了Mac中模拟器中的Documents文件夹，音频文件已保存，但我无法检查iPhone中的Documents文件夹。