【发布时间】:2010-11-03 08:01:18
【问题描述】:
如何将叠加层 (UIImageView) 添加到相机预览和
处理涉及到这个?
我之前的尝试(例如,使用 UIImagePickerController 并将图像添加为子视图)失败了。
【问题讨论】:
-
画得真棒!
-
一张图说一千个字
标签: iphone uiimageview camera uiimagepickercontroller
如何将叠加层 (UIImageView) 添加到相机预览和
处理涉及到这个?
我之前的尝试(例如,使用 UIImagePickerController 并将图像添加为子视图)失败了。
【问题讨论】:
标签: iphone uiimageview camera uiimagepickercontroller
本教程讲解:http://www.musicalgeometry.com/?p=821
只需在叠加视图中添加一个 UIImage,而不是教程中显示的红色区域。
【讨论】:
对于你的实现文件:
- (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];
}
创建一个 UIView 类并添加此代码
- (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;
}
【讨论】:
您也许可以直接将UIImageView 添加为主窗口的子视图,而不是UIImagePicker,它可能会更好。只需确保以正确的顺序添加它们,或调用
[window bringSubviewToFront:imageView];
相机启动后。
如果您想处理UIImageView 上的触摸,您只需将UIImageView 添加为具有透明背景的普通全屏View 的子视图,然后将 that 添加到窗口而是使用普通的UIViewController 子类,您可以使用它来处理触摸事件。
【讨论】:
查看相机叠加视图(在 3.1 及更高版本中可用)
@property(nonatomic, retain) UIView *cameraOverlayView
【讨论】: