使用长按手势与 AVFoundation 开始停止录制

Posted 2023-02-23

【中文标题】使用长按手势与 AVFoundation 开始停止录制

【英文标题】：Use long press gesture with AVFoundation to start stop recording

【发布时间】：2015-04-28 15:32:25

【问题描述】：

您好，我想通过长按手势在 Objective-C 中使用 AVFoundation 编码开始停止录制。

我知道如何使用另一个按钮开始录制和停止录制，但不会全部使用同一个按钮。

谢谢！

【参考方案1】：

我在 github 中更改了您的代码，并在下面发布了代码。我添加UIGestureRecognizerDelegate 的原因是因为否则您的PLAYBUTTONs 点击会因为长按手势而被忽略。为了避免延迟，我将[gesture1 setMinimumPressDuration:0]; 更改为 0 秒。

当我运行该项目时，它可以按照您的要求完美运行：) 这是.h

//viewcontroller.h
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreAudio/CoreAudioTypes.h>
@interface ViewController : UIViewController  <AVAudioRecorderDelegate, AVAudioPlayerDelegate, UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIButton *playButton;
- (void)longPressed:(UIGestureRecognizer *)longPress;
- (IBAction)playTapped:(id)sender;
@end

这里是实现：

//viewcontroller.m
#import "ViewController.h"

@interface ViewController ()

    AVAudioRecorder *recorder;
    AVAudioPlayer *player;

@end

@implementation ViewController
@synthesize playButton;

- (void)viewDidLoad


    UILongPressGestureRecognizer *gesture1 = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressed:)];
    gesture1.delegate = self;
    [gesture1 setMinimumPressDuration:0];
    [self.view addGestureRecognizer:gesture1];


    [super viewDidLoad];

    // Disable Stop/Play button when application launches
    [playButton setEnabled:NO];

    // Set the audio file
    NSArray *pathComponents = [NSArray arrayWithObjects:
                               [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
                               @"MyAudioMemo.m4a",
                               nil];
    NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];

    // Setup audio session
    AVAudiosession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

    // Define the recorder setting
    NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];

    [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
    [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

    // Initiate and prepare the recorder
    recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordSetting error:nil];
    recorder.delegate = self;
    recorder.meteringEnabled = YES;
    [recorder prepareToRecord];


- (void)didReceiveMemoryWarning

    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.


- (void)longPressed:(UIGestureRecognizer *)longPress 
    if(([longPress state] == UIGestureRecognizerStateEnded) || ([longPress state] == UIGestureRecognizerStateEnded)) 
        NSLog(@"long press ended");
        [recorder stop];
        AVAudioSession *audioSession = [AVAudioSession sharedInstance];
        [audioSession setActive:NO error:nil];
    
    else if([longPress state] == UIGestureRecognizerStateBegan) 
        NSLog(@"long press detected");

        if (player.playing) 
            [player stop];
        

        if (!recorder.recording) 
            AVAudioSession *session = [AVAudioSession sharedInstance];
            [session setActive:YES error:nil];

            // Start recording
            [recorder record];
        
    



- (IBAction)playTapped:(id)sender 
    NSLog(@"playTapped");
    if (!recorder.recording)
        player = [[AVAudioPlayer alloc] initWithContentsOfURL:recorder.url error:nil];
        [player setDelegate:self];
        [player play];
    


#pragma mark - AVAudioRecorderDelegate

- (void) audioRecorderDidFinishRecording:(AVAudioRecorder *)avrecorder successfully:(BOOL)flag
    NSLog(@"audioRecorderDidFinishRecording");
    [playButton setEnabled:YES];


#pragma mark - AVAudioPlayerDelegate

- (void) audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Done"
                                                    message: @"Finish playing the recording!"
                                                   delegate: nil
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    [alert show];


#pragma mark - UIGestureRecognizerDelegate

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch 
    // test if our control subview is on-screen
    if (playButton.superview != nil) 
        if ([touch.view isDescendantOfView:playButton]) 
            // we touched our control surface
            return NO; // ignore the touch
        
    
    return YES; // handle the touch



@end

【讨论】：

哇！！这很棒！！非常感谢！！ :D

我现在正试图将长按集中在一个新的“记录”按钮上，我会及时通知您应用程序的进展情况！

好的，我在情节提要中添加了一个按钮，我在 .h 中添加了一个属性 recordButton，我将属性与按钮链接。添加 recordButton 以在 .m 中合成。在长按实现中，我更改了 longPress 并使用 sender 来播放按钮，并添加了这一行 recordButton = (UIButton*)sender.view;按钮可以工作，但长按也可以在按钮外工作:(我应该使用容器视图吗？

我还在 viewDidLoad [recordButton addGestureRecognizer:gesture1] 中更改/添加了这些行； [self.view addSubview:recordButton];

nice :) 如果有任何问题我会尽力提供帮助。保重我现在要睡觉了：D

【参考方案2】：

你可以像这样在里面设置一个UILongPressGestureRecognizer

- (void) viewDidLoad ....

UILongPressGestureRecognizer *gesture1 = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressed:)];
//[gesture1 setDelegate:self]; you won't need this most probably if detecting the long press is your only expectation from the gesture recognizer
[gesture1 setMinimumPressDuration:1];
[self addGestureRecognizer:gesture1];
//instead of [self addGest... you can try [self.view addGest.. as follows:
[self.view addGestureRecognizer:gesture1];

当用户按下视图至少 1 秒时，该函数被触发：

-(void)longPressed:(UIGestureRecognizer *)longPress 
    if(([longPress state] == UIGestureRecognizerStateEnded) || ([longPress state] == UIGestureRecognizerStateEnded)) 
        NSLog(@"long press ended");
        //[self stopRecording];
    
    else if([longPress state] == UIGestureRecognizerStateBegan) 
        NSLog(@"long press detected");
        //[self startRecording];
    

而不是您使用 UIButton 的旧方式：

-(IBAction) buttonPressed: (id)sender 
    NSLog(@"button press detected");
    //[self startRecording];

【讨论】：

谢谢，我不确定，当我停止按下按钮时会停止录制吗？我是这种开发的新手

你完全正确。我对 longPressed 方法做了一个小的修改。你能试试并给出反馈吗？这样，当用户开始长按 1 秒时，录音开始，当用户移开手指或来电时，录音停止

如果这可行并且您不希望在开始录制之前有 1 秒延迟，我将更改答案以使用 UITapGestureRecognizer 与当前解决方案结合使用

顺便说一句，“当我停止按下按钮时”。您是否将手势识别器添加到按钮？使用我的解决方案，您无需触摸按钮。您可以长按屏幕上的任意位置。注意：提供一些代码会对我们有所帮助

有没有办法在评论框外分享代码，因为太长了？