I'm new to iOS programming, now I'm writing a camera app using AVFoundation. My problem is I have to preview the image just taken at full screen size, but no matter how I tried, I just got a clipped image (top left proportion of the original image) displayed full screen size on the phone. My image just taken is at 1920 * 1080 res, my UIImageView is set to AspectFit, and on the storyboard, it appears at full screen size.
The code to display the image is like,
[self.imageView setFrame:self.view.bounds];
[self.imageView setContentMode:UIViewContentModeScaleAspectFit] ;
[self.imageView setImage:image] ;
[self.view insertSubview:_imageView aboveSubview:_previewView] ;
[self.view bringSubviewToFront:_stillButton] ;
[self.view bringSubviewToFront:_maskButton] ;
[self.view bringSubviewToFront:_confirmButton] ;
And when I observe the size of the UIImageView object self.imageView, the size is not at the screen size, but just 320*568. However, the previewView which is a AVFoundation camera shooting preview object, it is also at 320*568, but it appears the previewView size is correct from the looking of the running app. and at last, the self.view.frame.size is also 320*568.
So my problem is how to view the image taken at 1920*1080 at full screen size?
try this:
imageView.contentMode = UIViewContentModeCenter
Related
This how I add an image:
UIImageView *imageHolder = [[UIImageView alloc] initWithFrame:
CGRectMake((self.view.frame.size.width/2) - (290/2),(self.view.frame.size.height) - (140 * 1.8), 290, 140)];
UIImage *image = [UIImage imageNamed:#"no-pins.png"];
imageHolder.image = image;
imageHolder.contentMode = UIViewContentModeScaleAspectFit;
// optional:
// [imageHolder sizeToFit];
[self.view addSubview:imageHolder];
The size of the image (retina version) is exactly the same size as in CGRectMake above. However the image is a little blurred. I only can reduce the blur when I edit the image and give it a higher resolution in photoshop.
But images that I add through storyboard are all fine in quality. Any ideas what might be wrong?
For retina graphics, the image size should be twice the size of the frame of the image view. This allows the image to use a scale of 2 to take advantage of the retina screen capability. So, you should have one image of size 290x140 (if you are supporting non-retina devices) and one image of size 580x280 (this is the #2x image).
The frame of the view is the description of the position and size of the view within the view hierarchy (in terms of the superview coordinate system). If you have fractional values in the frame size or position you can get 'blurring' effects.
In my application, i need the user to take a snap of only a 10 letter word (using overlay, which should be right in the centre of the screen of the UIImagePicker), and then in need to show him that image (only the part of the image covered by that rectangle). So, I need to crop that image according to the overlay.
Here, i have taken a picture using UIImagePickerControl. Now, i want to see the dimensions of the image that i have taken..
UIImage *imageToprocess = [info objectForKey:UIImagePickerControllerOriginalImage];
NSLog(#"image width %f", imageToprocess.size.width);
NSLog(#"image height %f", imageToprocess.size.height);
I see the following result on console.. But how is this possible. the dimensions of the image is exceeding the dimension of the iPhone screen size.. (which is 320, 568)
UsingTesseractOCR[524:60b] image width 2448.000000
2013-12-17 16:02:18.962 UsingTesseractOCR[524:60b] image height 3264.000000
Can anybody help me out here?? I have gone through several questions here, but did not understand how to do it.
Please help..
Refer this sample code for image capturing and cropping.
https://github.com/kishikawakatsumi/CropImageSample
For creating overlay, first create a custom view (of full dimensions of camera preview) and add an transparent image with just a rectangle in its background. use this view as overlay view.
myview =[[UIImageView alloc]init];
myview.frame=CGRectMake(0, 0, 320, 431);
// why 431? bcoz height = height of device - height of tabbar present in the
bottom for camera controls of picker
//for iphone 4 ,480-49
myview.backgroundColor =[UIColor clearColor];
myview.opaque = NO;
myview.image =[UIImage imageNamed:#"A45Box.png"];
myview.userInteractionEnabled =YES;
note that you create a background image appropriately (means dimensions). You can also draw rectangle programmatically but this is much easy way.
Secondly, talking about your cropping issue, you have to get your hands dirty....Try these links for help
https://github.com/iosdeveloper/ImageCropper
https://github.com/barrettj/BJImageCropper
https://github.com/ardalahmet/SSPhotoCropperViewController
![enter image description here][1]I am taking a UIImage from UIImagePickerController and showing it in a UIImageView. Actually the UIImagePickerController is in full screen and thus the UIImage is also. But UIImageView is not in full screen because of presence of a header bar.
The Image is getting stretched..
How do I fix this..
Please help me someone..
THANKS IN ADVANCE.....
First image is the image picker screen and second one is where I am displaying the UIImage captured from picker in a UIImageView.
![This is my UIImagePickerController][2]
![This is the image after capturing being shown in a UIImageview. ][3]
NOTE: BOTH THE SCREENS ARE IN LANDSCAPE MODE
Use this for your UIImageView
imageView.contentMode = UIViewContentModeScaleAspectFill;
You won't get any space and with scale preserved. However, some part of the image will be clipped off.
If you use:
imageView.contentMode = UIViewContentModeScaleAspectFit;
There will be some empty space, but scale is preserved.
In the UIImagePicker the user takes photos, then the photos are saved, and loaded into a tableview, now when the images are taken normally (portrait) they are a perfect size in the image view because this is how I set it. But when the user takes an image with the device in landscape, the image looks skewed and looks very distorted. (See picture)
Top is portrait picture, bottom is landscape
So does anyone have any suggestions on how this can be done?
Any help would be amazing
If it is taken in Landscape, then you show it another frame with size width > height. Or try using the following code and see if it improves something.
imageViewTemp.clipsToBounds = YES;
imageViewTemp.contentMode = UIViewContentModeScaleAspectFit;
The UIImageView stretches images to fit its size. This is what you are seeing. To stop it, you might change the size of the image view, like so:
CGRect newFrame = CGRectMake(imageView.frame.origin.x,
imageView.frame.origin.y,
image.size.width,
image.size.height);
imageView.frame = newFrame;
I have an UIView that contains a UIImageView. The UIImageViews works like the branding logo of the app. When I rotate the device, the containing UIView resizes itself to correspond to the landscape or portrait proportions of the screen.
What I'm trying to achieve is to have the UIImageView scaled accordingly, keeping proportions also on the left margin.
This is the actual code for the top white "banner":
UIView *topBanner = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, height_topBanner)];
[topBanner setAutoresizingMask:(UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleBottomMargin)];
[topBanner setBackgroundColor:[UIColor whiteColor]];
topBanner.autoresizesSubviews = YES;
// the logo
UIImage *topBanner_logo = [UIImage imageNamed:#"logo.png"];
float logoAspectRatio = topBanner_logo.size.width/topBanner_logo.size.height;
topBanner_logoView = [[UIImageView alloc] initWithFrame:CGRectMake(topBanner.frame.size.width/100*3, topBanner.frame.size.height/100*7, (topBanner.frame.size.height/100*86)*logoAspectRatio, topBanner.frame.size.height/100*86)];
[topBanner_logoView setImage:topBanner_logo];
topBanner_logoView.backgroundColor = [UIColor blueColor];
topBanner_logoView.contentMode = UIViewContentModeScaleAspectFit;
[topBanner_logoView setAutoresizingMask:(UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleBottomMargin|UIViewAutoresizingFlexibleRightMargin)];
[topBanner addSubview:topBanner_logoView];
[self.view addSubview:topBanner];
This is my starting point: portrait iPad on startup:
This is what happens when I rotate it in landscape:
As you can see, the proportions of the UIImage are ok, but I'm getting extra borders (I set the background color of the UIImageView to highlight it) because the UIImageView stretches itself to follow the change of the size of its container, and the UIImage is fit into the UIImageView and put on its center.
The same - reversed - happens when I start the app directly in landscape mode:
Then I rotate it:
... and I get the logo with extra borders on top and bottom.
I do see that I can write a function to recalculate every size on each rotation change, but I'm asking to myself if is there a way to set the UIImageView and the UIImage to make it works without hacking the autorotate/resize procedures of iOS. It sounds so simple!
You can solve this by not using UIViewContentModeScaleAspectFit, and instead calculating the aspect ratio of the image and using that to explicitly the width or height based on the other (width or height).
e.g. I rotate to landscape, and so I want the height to be 80% of the view.
CGFloat w = logo.image.size.width;
CGFloat h = logo.image.size.height;
CGFloat a = w / h;
CGFloat h_use = self.view.height *0.8;
CGFloat w_use = h_use*a;
Furthermore, set the content mode to UIViewContentModeScaleAspectFill instead now that you've explicitly set the aspect ratio.
You have set the auto resizing mask to flexible height and width:
[topBanner_logoView setAutoresizingMask:(UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleBottomMargin|UIViewAutoresizingFlexibleRightMargin)];
If you do not do that, the default is that the view will not chance size, and therefore, the image will not either.
I think it is because of topBanner_logoView.contentMode = UIViewContentModeScaleAspectFit;
Try topBanner_logoView.contentMode = UIViewContentModeCenter or topBanner_logoView.contentMode = UIViewContentModeLeft to prevent the UIImageView's image from resizing (and getting padding).
If the UIImageView is resizing, remove the autoresizing mask.