I need image size from URL, When I set image from URL in UITableView
cell, Then I need a frame of UIImage so that I can set UIImageView
Frame size accordingly. I am using below code
cell.imgPostedImage.sd_setImage(with: URL(string: imageArray[0]),placeholderImage: UIImage(named: "placeholder"),options:
SDWebImageOptions(rawValue: 0), completed: { (image, error, cacheType,imageURL) in
print(image?.size.height)
cell.imgPostedImage.setNeedsLayout()
})
Related
Using CIGaussianBlur causes UIImageView to apply the blur from the border in, making the image appear to shrink (right image). Using .blur on a SwiftUI view does the opposite; the blur is applied from the border outwards (left image). This is the effect I’m trying to achieve in UIKit. How can I go about this?
I've seen a few posts about using CIAffineClamp, but that causes the blur to stop at the image boarder which is not what I want.
private let context = CIContext()
private let filter = CIFilter(name: "CIGaussianBlur")!
private func createBluredImage(using image: UIImage, value: CGFloat) -> UIImage? {
let beginImage = CIImage(image: image)
filter.setValue(beginImage, forKey: kCIInputImageKey)
filter.setValue(value, forKey: kCIInputRadiusKey)
guard
let outputImage = filter.outputImage,
let cgImage = context.createCGImage(outputImage, from: outputImage.extent)
else {
return nil
}
return UIImage(cgImage: cgImage)
}
When I used CIGaussianBlur I wanted my output image to be contained inside the image frame, so I used CIAffineClamp on the image before applying the blur, as you describe.
You might need to render your source image into a larger frame, clamp to that larger frame using CIAffineClamp, apply your blur filter, then load the resulting blurred output image. Core Image is a bit of a pain to set up and figure out, so I don’t have a full solution ready for you, but that’s what I would suggest.
When I use PHImageManager() to retrieve an image from the photo library, the image is converted from a jpeg image to a png image, and the image is degraded.
How can I retrieve the image without image degradation?
Is it a standard specification that the extension is changed from jpeg to png?
If anyone knows, please respond.
Here is a sample code I made.
img is returned as png.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let assets: PHFetchResult = PHAsset.fetchAssets(with: .image, options: nil)
let mg: PHImageManager = PHImageManager()
guard let asset = assets.lastObject else {
return
}
let options = PHImageRequestOptions()
options.isNetworkAccessAllowed = true
options.deliveryMode = .highQualityFormat
mg.requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: .aspectFit, options: options, resultHandler: { image, info in
let img = image
})
}
}
When requesting a high quality image, the result handler of requestImage may be called initially with a low quality version of the image, then later called again with the high quality version.
You can check this by inspecting the PHImageResultIsDegradedKey of the info dictionary parameter of the result handler, for example:
mg.requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: .aspectFit, options: options, resultHandler: { image, info in
if info?[PHImageResultIsDegradedKey] as? Bool == true {
print("Degraded image returned, will wait for high quality image")
return
}
let img = image
})
From the documentation for PHImageManager.requestImage:
[...] Photos may call your result handler block more than once. Photos first calls the block to provide a low-quality image suitable for displaying temporarily while it prepares a high-quality image. (If low-quality image data is immediately available, the first call may occur before the method returns.) When the high-quality image is ready, Photos calls your result handler again to provide it. If the image manager has already cached the requested image at full quality, Photos calls your result handler only once. The PHImageResultIsDegradedKey key in the result handler’s info parameter indicates when Photos is providing a temporary low-quality image.
I'm using SDWebImage for my Swift. I can't figure out why (frankly, HOW) it's not working. there is no image in imageview.
so this is what i'm trying. parse query PFFile(s) (url converted) stored in a var urlArray:[URL] = []
i have a UIScrollView with UIImageView inside.
in short: query parse - download PFFile URLs to an array (append).
for index in 0..<self.urlArray.count {
var frame = CGRect.zero
frame.origin.x = self.scrollView.frame.size.width * CGFloat(index)
frame.size = self.scrollView.frame.size
self.scrollView.isPagingEnabled = true
let subView = UIImageView(frame: frame)
subView.sd_setImage(with: self.urlArray[index], placeholderImage: #imageLiteral(resourceName: "profile"))
//subView.contentMode = .scaleAspectFit
self.scrollView.addSubview(subView)
}
first url image appears ok. then no pagination & no error (array numbers OK) just nothing apears but first pic. used this : imageview.sd_setImage(with: self.urlArray[index]) is this wrong approach?
thanks
I don't see the code where you update the contentSize of the UIScrollView. Unless you do that, the scroll view won't scroll for you. The additional image views may be there, but hidden outside of the scroll view's current bounds.
sdWebImage is a library using for image caching.
If you wanna detect error for downloading image by sdWebImage then you apply below code and track response from server.
cell.imageView.sd_setImageWithURL(NSURL (string: sendImgUri!), placeholderImage: UIImage (named: "pro.png"), options: .CacheMemoryOnly, progress: { (i, m) in
}, completed: { (image, error, chachType, url) in
if(error != nil)
{
print(error)
}
else if(image != nil)
{
print(image)
}
})
I am implementing TopShelf in Apple tvOS. I have downloaded images and assigned to imageURL of TVContentItems. The downloaded images aspect ratio does not fit into the TopShelf Images properly. I have tried to change the size by appending width + height to the image link.
www.mydownloadedimages.com/{width}x{height}
But it didn't work.
Can I do resizing at client end in any other way. In the TVContentItem class I have only have NSURL object. There is no UIImage Object.
Thanks a lot.
Here is Apple's documentation on Image Sizes and shapes
// ~ 2 : 3
// ~ 1 : 1
// ~ 4 : 3
// ~ 16 : 9
// ~ 8 : 3
// ~ 87 : 28
//#property imageShape
//#abstract A TVContentItemImageShape value describing the intended aspect ratio or shape of the image.
//#discussion For Top Shelf purposes: the subset of values which are //valid in this property, for TVContentItems in the topShelfItems property //of the TVTopShelfProvider, depends on the value of the topShelfStyle //property of the TVTopShelfProvider:
TVTopShelfContentStyleInset:
valid: TVContentItemImageShapeExtraWide
TVTopShelfContentStyleSectioned:
valid: TVContentItemImageShapePoster
valid: TVContentItemImageShapeSquare
valid: TVContentItemImageShapeHDTV
When the value of this property is not valid for the Top Shelf style, the system reserves the right to scale the image in any way.
You're right saying that the TVContentItem has no UIImage type property. Since TVContentItem also accepts local file URLs in the imageURL property, a workaround can be:
grabbing the UIImage from internet
creating a new image context with the size of the top shelf image
saving it into the NSCacheDirectory
setting the local image URL as imageURL.
Here are the steps:
Let's create our TVContentItem object:
let identifier = TVContentIdentifier(identifier: "myPicture", container: wrapperID)!
let contentItem = TVContentItem(contentIdentifier: identifier )!
Set the contentItem's imageShape:
contentItem.imageShape = .HDTV
Grab the image from Internet. Actually I did this synchronously, you can also try to use other async methods to get that (NSURLConnection, AFNetworking, etc...):
let data : NSData = NSData(contentsOfURL: NSURL(string: "https://s3-ak.buzzfed.com/static/2014-07/16/9/enhanced/webdr08/edit-14118-1405517808-7.jpg")!)!
Prepare the path where your image will be saved and get your UIImage from the data object:
let filename = "picture-test.jpg"
let paths = NSSearchPathForDirectoriesInDomains(.CachesDirectory, .UserDomainMask, true)
let filepath = paths.first! + "/" + filename
let img : UIImage = UIImage(data: data)!
Assuming you've already set the topShelfStyle property, get the size of the top shelf image with the method TVTopShelfImageSizeForShape. This will be the size of your image context:
let shapeSize : CGSize = TVTopShelfImageSizeForShape(contentItem.imageShape, self.topShelfStyle)
Create your image context of shapeSize size and draw the downloaded image into the context rect. Here you can do all your modifications to the image to adjust it into the desired size. In this example I took a square image from Instagram and I put white letterbox bands on the right and left sides.
UIGraphicsBeginImageContext(shapeSize)
let imageShapeInRect : CGRect = CGRectMake((shapeSize.width-shapeSize.height)/2,0,shapeSize.height,shapeSize.height)
img.drawInRect(imageShapeInRect)
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
In the end, save this image into your NSCacheDirectory and set the image path as contentItem's imageURL.
UIImageJPEGRepresentation(newImage, 0.8)!.writeToFile(filepath, atomically: true)
contentItem.imageURL = NSURL(fileURLWithPath: filepath)
Complete your TVContentItem with other details (like title, internal link, etc...), run the top shelf extension... et voilà!
I would like to add to Nicola Giancecchi's answer. The Top Shelf extension will run on a non main thread so using methods like UIImageJPEGRepresentation or UIImagePNGRepresentation will sometimes stop the Top Shelf thread printing this in the console:
Program ended with exit code: 0
To fix this you can wrap your code like this:
DispatchQueue.main.sync {
UIImageJPEGRepresentation(newImage, 0.8)!.writeToFile(filepath, atomically: true)
let imageURL = NSURL(fileURLWithPath: filepath)
if #available(tvOSApplicationExtension 11.0, *) {
contentItem.setImageURL(imageURL, forTraits: .userInterfaceStyleLight)
contentItem.setImageURL(imageURL, forTraits: .userInterfaceStyleDark)
} else {
contentItem.imageURL = imageURL
}
}
Currently I am working on an NSImageView, on which the user drags and drops an image, and the images gets saved to the disk. I am able to save png and jpeg images, but while saving GIF images, all that is saved is a single frame from the gif. The imageView is able to display the whole animated gif though.
My current implementation to save image from NSImageView to disk is:
let cgRef = image.CGImageForProposedRect(nil, context: nil, hints: nil)
let newRep = NSBitmapImageRep(CGImage: cgRef!)
newRep.size = image.size
let type = getBitmapImageFileType(imageName.lowercaseString) // getBitmapImageFileType: returns NSBitmapImageFileType
let properties = type == .NSGIFFileType ? [NSImageLoopCount: 0] : Dictionary<String, AnyObject>()
let data: NSData = newRep.representationUsingType(type, properties: properties)!
data.writeToFile(link, atomically: true)
How should I modify this code to be able to save all the frames of GIF to the disk.