实现“缩放”功能在AVCamViewController [英] Implementing "Zoom" feature in AVCamViewController
问题描述
我想在我的应用程式中实作「缩放」功能。我的应用程序只支持静态图像,没有视频捕获等。我认为应该直接,但是,我可以缩放图像,然而,当我拍摄一个stillImage,图像出来作为完整的图像,没有放大/输出效果。
我使用Apple提供的AVCamViewController类。
如果你们指出我错过了什么,我会很感激。
I'm trying to implement "Zoom" feature in my app. My app only supports Still Image, no video capturing etc.. i thought it should be straight forward however, i'm able to zoom the image however when i take a stillImage, the image comes out as full image, no zoom-in/out effects. I'm using AVCamViewController class provided by Apple. I would appreciate if you guys point what i'm missing.
- (IBAction)zoomView {
self.zoomScale = 1 + self.zoomSlider.value;
self.previewView.transform = CGAffineTransformScale(CGAffineTransformIdentity,self.zoomScale, self.zoomScale);
DLog(@"zoom scale:%f",self.zoomScale);
}
推荐答案
代码,那么我建议在AVCaptureDeviceInput对象上执行缩放,而不是缩放视图。
If you are using Apple's sample code, then I would suggest performing the zoom on the on the AVCaptureDeviceInput object as opposed to zooming a view.
例如,这是我在UIGestureRecognizer处理pinch手势):
For instance, this is how I do it within a UIGestureRecognizer (that handles pinch gestures):
dispatch_async(self.sessionQueue, ^{
AVCaptureDevice *device = [[self getActiveVideoDeviceInput] device];
NSError *error = nil;
if ([device lockForConfiguration:&error])
{
device.videoZoomFactor = MAX(scale, 1.0);
[device unlockForConfiguration];
}
else
{
NSLog(@"%@", error);
}
});
这篇关于实现“缩放”功能在AVCamViewController的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!