ios - 如何在 ViewController 中获取委托(delegate)方法以查看 *recorder 何时完成(不同的类)

Question

我有一个单例

@implementation RDTRecord
@synthesize recorder;
+(RDTRecord *)sharedRecorder
{
static RDTRecord* sharedRecorder;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
    sharedRecorder = [[RDTRecord alloc]init];
});
return sharedRecorder
}

和一个方法:

- (void)doRecordAudio:(int)increment{
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:nil];
... file location etc.
 recorder = [[AVAudioRecorder alloc]initWithURL:outputFileURL settings:settings               error:&error];
if (recorder) {
    [recorder prepareToRecord];

    [recorder recordForDuration:(NSTimeInterval) 3.0]
}

在一个类(class) RDTRecord
我从 RDTViewController 中的“记录”按钮调用它使用以下内容:

-(IBAction)recordButton:(UIButton *)sender

        //somenumber is not initialized yet so plug any int in here
        [[RDTRecord sharedRecorder] doRecordAudio:somenumber]; 
}

我想实现委托(delegate)...

-(void)audioRecorderDidFinishRecording:(AVAudioRecorder *)sharedRecorder successfully:(BOOL)flag {
...do some stuff here
}

在我的 RDTViewController不在 RDTRecord
我的 vc 的界面是:

#import <UIKit/UIKit.h>
#import "RDTRecord.h"

@interface RDTViewController : UIViewController <AVAudioRecorderDelegate>;

@property (weak, nonatomic) IBOutlet UIButton *recordButton;

- (IBAction)recordButton:(UIButton *)sender;
-(void)audioRecorderDidFinishRecording:(AVAudioRecorder *)sharedRecorder successfully:(BOOL)flag;
@end

.h 为 RDTRecord如下:

#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
#import "RDTViewController.h"

@interface RDTRecord : NSObject {
    AVAudioRecorder *recorder;
}

@property (nonatomic,strong) AVAudioRecorder *recorder;

+(RDTRecord *)sharedRecorder;
- (void)doRecordAudio:(int)increment;
@end

问题是:我怎样才能得到委托(delegate)方法 audioRecorderDidFinishRecording在我的 RDTViewController到“看”的时候 *recorder如果 *recorder 则结束正在上课 RDTRecord ?
或者，问同样问题的另一种方式可能是:如果委托(delegate)在另一个类中，我如何让 AVAudioRecorder *recorder 对象“知道”使用委托(delegate) - 例如 RDTViewController那个代码会是什么样子？

Answer 1

制作 RDTRecord录音机的委托(delegate)并让它实现audioRecorderDidFinishRecording:successfully: .但是，也给它一个属性@property (assign) id <AVAudioRecorderDelegate> delegate;并且，当您的 View Controller 想要触发录制时，请将其设置为 RDTRecord 的委托(delegate).

现在，当 audioRecorderDidFinishRecording:successfully:在 RDTRecord 中调用它可以将回调转发给它的委托(delegate):

- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)sharedRecorder successfully:(BOOL)flag
{
    [self.delegate audioRecorderDidFinishRecording:sharedRecorder successfully:flag];
}

(您也可以将委托(delegate)添加为 doRecordAudio: 的参数，并在回调运行后添加 nil 和 delegate，具体取决于您的其他要求)。

View Controller 应在完成后(以及在销毁之前)将自己作为委托(delegate)移除。