使大图像适合小尺寸的图像视图

Question

I am trying to make a large image fit into an UIImageView of small size. How can I reduce the size of the image or scale it appropriately so that the full image fits into the UIImageView ?

Answer 1

try to use different modes like scale to fill , aspect fit , aspect fill` etc.

i think accorging to your requirement scale to fill is good.

aspect fit will keep the original shape your image and fit accorging to aspect ratio so it will possible that some portion of your imageview remains blank or not cover by image.

Scale to fit try to scale image according to imageview. this is by default mode.

aspect fill will fill whole imageview with aspect ratio.

so choose whatever is best for you. you can easily change mode from storyboard from attribute inspector.

hope this will help :)

Answer 2

Set the desired frame of your imageView and set the content mode of the image View. For example :

imgView.contentMode = UIViewContentMode.ScaleAspectFit
//OR 
imgView.contentMode = UIViewContentMode.ScaleAspectFill
//OR
imgView.contentMode = UIViewContentMode.ScaleToFill

Use whichever works for you.

By looking at the JSON I'm updating the answer:

As I had suspected, its a URL which you are getting in JSON. So do the following:

1. Parse the JSON and get the URL from the JSON.(videothumbnail key value)

2. The URL contains back slashes as escape charecters(http://content.m-tutor.com/images/20150916113347_5-cont.png) remove them to get the URL as this http://content.m-tutor.com/images/20150916113347_5-cont.png

3. Download the image Using below code :

    func startDownloadImageWithURL(urlInString: String?){ let session = NSURLSession.sharedSession(); if let urlInString = urlInString{ let urlToDownload = NSURL(string: urlInString) session.dataTaskWithURL(urlToDownload!, completionHandler: {(data : NSData?,response : NSURLResponse?, error : NSError?) -> Void in dispatch_async(dispatch_get_main_queue(), { if let error = error { print("Error while downloading \\(error.localizedDescription)") } else{ //Assuming the yourImageView is already initialized with position //yourImageView.image = UIImage(data: data) } }) }).resume() } } 

I have given just an example on how to download image(get the data), create the image using data downloaded and the set it to imageView, you can update it according to your need. Hope it helps :]

Answer 3

将imageView的模式设置为Aspect Fit

Answer 4

为您的图像视图设置此属性

imageView.contentMode  = UIViewContentModeScaleAspectFit;