Objective c 如何在不按下imagepickercontroller上的拍照按钮的情况下自动拍照?
在我的项目中,我需要每一分钟自动拍照一次。但我找不到任何解决办法 这是我实现的代码,但它不工作 我用NSTimer每4秒调一次相机拍照。我只需要一张照片Objective c 如何在不按下imagepickercontroller上的拍照按钮的情况下自动拍照?,objective-c,xcode,api,uiimagepickercontroller,Objective C,Xcode,Api,Uiimagepickercontroller,在我的项目中,我需要每一分钟自动拍照一次。但我找不到任何解决办法 这是我实现的代码,但它不工作 我用NSTimer每4秒调一次相机拍照。我只需要一张照片 //This method is all for the time setup. You can ignore it. -(NSDate *)userInfo { NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateF
//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];
}
您可以调用UIImagePickerController
的方法以编程方式拍照。例如,您可以使用计时器每分钟调用一次
编辑
您应该首先显示摄像头界面(更多信息)。您可以在方法showCameraUI
中执行此操作。您还应该保留对已创建的UIImagePickerController
的引用
- (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];
// ...
}
最后我想出了解决办法 我使用
AVCaptureVideoDataOutputSampleBufferDelegate
自动拍照
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection
它非常简单,感谢@sch的帮助:)可能有点晚了,但是piker函数有一个属性takePicture
double delayInSecondse = 3.0;
dispatch_time_t epopTime = dispatch_time(DISPATCH_TIME_NOW, delayInSecondse * NSEC_PER_SEC);
dispatch_after(epopTime, dispatch_get_main_queue(), ^(void){
[picker takePicture];
});
非常感谢你的帮助。但我无法让它成功运行。你能读懂我的台词并给我一些建议吗?我是objective-c的新手,所以…你能描述一下你现在的行为吗?是否执行了
targetMethod:
?执行targetMethod:
时,您确定picker
不是nil
吗?我确定targetMethod:可以运行,因为如果我实现UIImagePickerController视图,它可以定期显示。但是如果我只实现了简单的验证,那么在[picker takePicture]行中放置一个断点
并查看调试器是否停止在那里。还要检查选择器是否不是nil
。。。然后我更改了代码,但程序在[picker takePicture]接收到EXC_BAD_访问;