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In iOS we have to set the images on different kind of devices such as iPhone 4, 5,6 etc. each phone has high scale factor due to that reason images , display in sharp and clear. for that we need to find out scale factor of phone.
there is some condition for setting images
1: we make request to server for getting images.
2: we directly fetch the images from url.
1: if we are making request to server for images then we have to send the request in this way:
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let width = String(format:"%f", SCREEN_WIDTH * UIScreen.main.scale); post .appendFormat("width=%@", width); |
note: we multiply the screen width of phone to scale factor.
2: we directly display data on UIimageview
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DispatchQueue.global(qos: .background).async { let operation2 = BlockOperation(block: { let data = try? Data(contentsOf: url) if data != nil{ let img = UIImage(data: data!) OperationQueue.main.addOperation({ productImage.image = img }) } }) self.queue.addOperation(operation2) } |
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