[英]iPhone: Camera Preview Overlay
How do I add an overlay ( UIImageView
) to the camera preview and handle touches on this?如何向相机预览添加叠加层 ( UIImageView
) 并处理其上的触摸?
My previous attempts to do this (eg use UIImagePickerController
and add the image as a subview) have failed.我以前尝试这样做(例如使用UIImagePickerController
并将图像添加为子视图)都失败了。
This tutorial explains it: http://www.musicalgeometry.com/?p=821 本教程解释了它: http : //www.musicalgeometry.com/? p = 821
Just add a UIImage in the overlay view instead of the red area shown in the tutorial. 只需在叠加视图中添加UIImage,而不是教程中显示的红色区域。
For your implementation file:对于您的实施文件:
- (IBAction)TakePicture:(id)sender {
// Create image picker controller
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
// Set source to the camera
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
// Delegate is self
imagePicker.delegate = self;
OverlayView *overlay = [[OverlayView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
// Insert the overlay:
imagePicker.cameraOverlayView = overlay;
// Allow editing of image ?
imagePicker.allowsImageEditing = YES;
[imagePicker setCameraDevice:
UIImagePickerControllerCameraDeviceFront];
[imagePicker setAllowsEditing:YES];
imagePicker.showsCameraControls=YES;
imagePicker.navigationBarHidden=YES;
imagePicker.toolbarHidden=YES;
imagePicker.wantsFullScreenLayout=YES;
self.library = [[ALAssetsLibrary alloc] init];
// Show image picker
[self presentModalViewController:imagePicker animated:YES];
}
Make a UIView class and add this code制作一个 UIView class 并添加此代码
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
// Clear the background of the overlay:
self.opaque = NO;
self.backgroundColor = [UIColor clearColor];
// Load the image to show in the overlay:
UIImage *overlayGraphic = [UIImage imageNamed:@"overlaygraphic.png"];
UIImageView *overlayGraphicView = [[UIImageView alloc] initWithImage:overlayGraphic];
overlayGraphicView.frame = CGRectMake(30, 100, 260, 200);
[self addSubview:overlayGraphicView];
}
return self;
}
You may be able to add the UIImageView
as a subview of the main window directly instead of the UIImagePicker
, it may work better.您可以直接将UIImageView
添加为主要 window 的子视图,而不是UIImagePicker
,它可能会更好。 Just make sure to add them in the right order, or call只需确保以正确的顺序添加它们,或致电
[window bringSubviewToFront:imageView];
after the camera is up.相机升起后。
If you want to handle touches on the UIImageView
you could just add the UIImageView
as a subview of a normal fullscreen View
with a transparent background, and add that to the window instead, with a normal UIViewController
subclass that you can use to handle the touch events.如果你想处理UIImageView
上的触摸,你可以将UIImageView
添加为具有透明背景的普通全屏View
的子视图,然后将其添加到 window 中,使用普通的UIViewController
子类来处理触摸事件.
See the camera overlay view (available in 3.1 and later)查看相机叠加视图(在 3.1 及更高版本中可用)
@property(nonatomic, retain) UIView *cameraOverlayView
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