如何在不按uiimagepickercontroller上的拍照按钮的情况下自动拍照？

在我的项目中，我需要每隔一分钟自动拍照一次。但我找不到任何解决方案。

这是我实现的代码，但它不起作用......

我使用 NSTimer 调用相机每 4 秒拍照一次。我只需要拍照

//This method is all for the time setup. You can ignore it.

-(NSDate *)userInfo {

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

[dateFormatter setDateFormat:@"yyyy-MM-dd 'at' HH:mm:ss"];

NSDate *date = [[[NSDate alloc]init]autorelease];

NSString *formattedDateString = [dateFormatter stringFromDate:date];

NSLog(@"formattedDateString: %@", formattedDateString);   

return date;    
}


- (void)targetMethod:(NSTimer *)theTimer {
   NSDate *startDate = [self userInfo];

   //newly changed lines.
   UIImagePickerController *myPicker;
   [myPicker takePicture];
   NSLog(@"Timer started on %@", startDate);

}


- (IBAction) showCameraUI {


   [NSTimer scheduledTimerWithTimeInterval:4.0
                                 target:self
                               selector: @selector(targetMethod:)
                               userInfo:[self userInfo]
                                repeats:YES];

}

你可以调用该方法- (void)takePicture; of UIImagePickerController以编程方式拍照。例如，您可以使用计时器每隔一分钟调用一次。

Edit

您应该首先显示相机界面（更多信息here）。您可以在方法中执行此操作showCameraUI。您还应该保留对创建的引用UIImagePickerController.

- (IBAction) showCameraUI
{
    UIImagePickerController *picker;
    // create and display picker

   self.imagePicker = imagePicker;
   [NSTimer scheduledTimerWithTimeInterval:4.0
                             target:self
                           selector: @selector(targetMethod)
                           userInfo:nil
                            repeats:YES];
}

- (void)targetMethod
{
    [self.picker takePicture];
    // ...
}