cgsize

问题 I'm asking this (somehow) simple question just to be finicky, because sometimes I'm worried about a misuse I might be doing of many UIView's APIs, especially when it comes to autolayout. To make it super simple I'll go with an example, let's assume I need an UIView subclass that has an image icon and a multiline label; the behaviour I want is that the height of my view changes with the height of the label (to fit the text inside), also, I'm laying it out with Interface builder, so I have

问题 From the URL Image in Mail I'm adding image to mail view. It will show full image. But I want to calculate, proportionally change the height and width of the image. How can I get the height and width of UIImage ? 回答1: let heightInPoints = image.size.height let heightInPixels = heightInPoints * image.scale let widthInPoints = image.size.width let widthInPixels = widthInPoints * image.scale 回答2: Use the size property on the UIImage instance. See the documentation for more details. 回答3: UIImage