我正在使用 UIImagePickerController 和自定义叠加层构建一个应用程序。所做的是比较两个图像(前图像和后图像)。拍摄后照时,我使用了带有前照的自定义叠加层(请参阅所附图片)。
iPhone 5 - ios7
iPhone 4 - iOS7(拍照时)
iPhone 4 - iOS 7(拍照后)
查看 iPhone 4 和 iPhone 5 相机 View 之间的大小差异。
应用程序适用于 iPhone 5 屏幕尺寸(ios 6 和 ios7)。但是 iPhone 4/4s 屏幕尺寸,它只适用于 iOS6。问题出在 iphone 4/4s(仅限 ios7),相机 View 全屏显示。 这意味着,你可以注意到 iPhone 5 相机 View 尺寸 ~ 320*427 (iOS 6 和 iOS 7) iPhone 4 相机 View 尺寸 ~ 320*427 (iOS 6) 但 iPhone 4 相机 View 大小 ~ 320*480 (iOS 7)。
图片拍摄后,适合320*427的实际尺寸。由于这个问题,我无法在 iPhone 4 iOS7 上将前图像与相机 View 对齐(因为它的尖叫声为 320*480)。
有没有人遇到这个奇怪的问题。我几乎尝试了一切,但没有运气。有什么想法吗???
这是我的一段代码,用于在照片叠加之前使用自定义加载相机 View 。
- (void)loadCameraWithImage
{
if (!isLoadedOnce)
{
isLoadedOnce = YES;
UIImagePickerController *cameraView = [[UIImagePickerController alloc] init];
cameraView.sourceType = UIImagePickerControllerSourceTypeCamera;
cameraView.wantsFullScreenLayout = NO;
if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)]) {
[self setEdgesForExtendedLayout:UIRectEdgeNone];
}
// crop before image
UIImage *imgTmpCropped = [self imageByCropping:imgBefore toRect:CGRectMake(0, 0, imgBefore.size.width/2, imgBefore.size.height)];
UIImage *overleyImage = [[UIImage alloc] initWithCGImage: imgTmpCropped.CGImage
scale: [UIScreen mainScreen].scale
orientation: UIImageOrientationDownMirrored];
UIImageView *crosshairView;
UIImageView *beforeView;
CGFloat screenHieght = [UIScreen mainScreen].bounds.size.height;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
//overleyImage = [UIImage imageNamed:@"overlay_ipad.png"];
crosshairView = [[UIImageView alloc] initWithImage:overleyImage];
crosshairView.frame = CGRectMake(0, 0, 768, 1024);
[crosshairView setUserInteractionEnabled:YES];
crosshairView.backgroundColor = [UIColor clearColor];
beforeView = [[UIImageView alloc] initWithImage:overleyImage];
beforeView.frame = CGRectMake(0, 0, 384, 1024);
beforeView.alpha = 0.5;
beforeView.contentMode = UIViewContentModeScaleAspectFill;
}
else {
//overleyImage = [UIImage imageNamed:@"overleyImageAfter.png"];
crosshairView = [[UIImageView alloc] init];
beforeView = [[UIImageView alloc] initWithImage:overleyImage];
if(screenHieght>500){
crosshairView.frame = CGRectMake(0, 60, 320, 480);
beforeView.frame = CGRectMake(0, 70, 160, 427);
}
else{
if([[[UIDevice currentDevice] systemVersion] floatValue] <7.0){
crosshairView.frame = CGRectMake(0, 0, 320, 480);
beforeView.frame = CGRectMake(0, 0, 160, 427);
}
else{
crosshairView.frame = CGRectMake(0, 0, 320, 480);
beforeView.frame = CGRectMake(0, 0, 160, 480);
}
}
[crosshairView setUserInteractionEnabled:YES];
crosshairView.backgroundColor = [UIColor clearColor];
beforeView.alpha = 0.5;
beforeView.contentMode = UIViewContentModeScaleToFill;
}
//[crosshairView addSubview:beforeView];
//set our custom overlay view
cameraView.cameraOverlayView = beforeView;
cameraView.delegate = (id)self;
cameraView.showsCameraControls = YES;
cameraView.navigationBarHidden = YES;
cameraView.toolbarHidden = YES;
[cameraView setHidesBottomBarWhenPushed:YES];
[self.view.window.rootViewController presentViewController:cameraView animated:YES completion:nil];
isLoadedOnce = NO;
}
最佳答案
长话短说
相机的预览在每个设备上都有相同的宽高比 (4:3),屏幕则不同。假设预览将具有特定的纵横比,并将放置在屏幕上的特定位置。在该区域内绘制叠加层。
更长:
我们遇到了同样的问题。 (我们的用例是用与卡片大小相同的覆盖层拍摄信用卡照片)。主要问题是相机预览的比例在每台设备上始终相同 (4:3),但不同的手机有不同的屏幕比例(例如 iPhone 4s 与 iPhone 5),因此预览需要以不同的方式进行调整,这使得放置非常困难的叠加和裁剪。
我们的解决方案是(代码有点乱,不好意思,抱歉):
// Adjust camera preview to be a little bit more centered instead of adjusted to the top
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
float cameraAspectRatio = 4.0 / 3.0;
float imageHeight = screenSize.width * cameraAspectRatio;
float verticalAdjustment;
if (screenSize.height - imageHeight <= 54.0f) {
verticalAdjustment = 0;
} else {
verticalAdjustment = (screenSize.height - imageHeight) / 2.0f;
verticalAdjustment /= 2.0f; // A little bit upper than centered
}
CGAffineTransform transform = self.cameraController.cameraViewTransform;
transform.ty += verticalAdjustment;
self.cameraController.cameraViewTransform = transform;
CGRect previewFrame = CGRectMake(0, verticalAdjustment, screenSize.width, imageHeight);
CardPhotoView *overlayView = [[CardPhotoView alloc] initWithFrame:CGRectMake(0, 0, screenSize.width, screenSize.height) widthPercentageOfCamera:self.widthPercentageOfCamera previewFrame:previewFrame];
self.overlayView = overlayView;
self.overlayView.delegate = self;
self.overlayView.useViewport = YES;
[self.overlayView setCameraReady:NO];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(cameraIsReady:) name:AVCaptureSessionDidStartRunningNotification object:nil];
self.cameraController.showsCameraControls = NO;
self.cameraController.navigationBarHidden = YES;
self.cameraController.toolbarHidden = YES;
self.cameraController.cameraOverlayView = self.overlayView;
[self presentViewController:self.cameraController animated:NO completion:nil];
解释:
self.cameraController
是一个 UIImagePickerController
。 CardPhotoView
是一个绘制叠加层的 View 子类,它需要预览框架才能准确知道预览的位置(有些设备的顶部和底部会有黑条,有些则没有)。它还需要一个宽度百分比来为裁剪窗口添加一点填充。
此外,我们隐藏了所有默认的相机控件,并实现了一些可以为我们完成工作的按钮。这些按钮被添加到 CardPhotoView
类中,并且在绘制它们时会考虑预览框架的位置。
关于ios - UIImagePickerController 相机 View 大小问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21700319/