How to get Image size from URL in ios

Question

How can I get the size(height/width) of an image from URL in objective-C? I want my container size according to the image. I am using AFNetworking 3.0. I could use SDWebImage if it fulfills my requirement.

There aren't any need to know size of image.Try to create UIImageView any size you want and change his content type(scaletofill, aspectfill, aspectfit etc) — Bohdan Savych, May 24 '16 at 08:52
From which URL you download the image? Many API for image service provide the height/width property in the fetched data(like json) You can have the look at the API Document. — ilovecomputer, May 24 '16 at 09:45
What a requirement!! Please verify your requirement once again. I guess you are missing something. — TheTiger, May 24 '16 at 11:18
Thanks to all above. Actually image is coming from my own server. But These are not of the same resolutions. Minimum is 800*800. But I need to know image size to update my image view accordingly. — Muhammad Zeeshan Anwar, May 24 '16 at 11:55

score 19 · Answer 1 · answered Oct 15 '16 at 18:36

Knowing the size of an image before actually loading it can be necessary in a number of cases. For example, setting the height of a tableView cell in the heightForRowAtIndexPath method while loading the actual image later in the cellForRowAtIndexPath (this is a very frequent catch 22).

One simple way to do it, is to read the image header from the server URL using the Image I/O interface:

#import <ImageIO/ImageIO.h>

NSMutableString *imageURL = [NSMutableString stringWithFormat:@"http://www.myimageurl.com/image.png"];

CGImageSourceRef source = CGImageSourceCreateWithURL((CFURLRef)[NSURL URLWithString:imageURL], NULL);
NSDictionary* imageHeader = (__bridge NSDictionary*) CGImageSourceCopyPropertiesAtIndex(source, 0, NULL);
NSLog(@"Image header %@",imageHeader);
NSLog(@"PixelHeight %@",[imageHeader objectForKey:@"PixelHeight"]);

Great answer! Helped me a lot. Thank you! – handiansom Sep 04 '17 at 09:07 — handiansom, Sep 04 '17 at 09:07

score 6 · Answer 2 · answered Jan 07 '21 at 10:42

Swift 4.x
Xcode 12.x

func sizeOfImageAt(url: URL) -> CGSize? {
    // with CGImageSource we avoid loading the whole image into memory
    guard let source = CGImageSourceCreateWithURL(url as CFURL, nil) else {
        return nil
    }
    
    let propertiesOptions = [kCGImageSourceShouldCache: false] as CFDictionary
    guard let properties = CGImageSourceCopyPropertiesAtIndex(source, 0, propertiesOptions) as? [CFString: Any] else {
        return nil
    }
    
    if let width = properties[kCGImagePropertyPixelWidth] as? CGFloat,
       let height = properties[kCGImagePropertyPixelHeight] as? CGFloat {
        return CGSize(width: width, height: height)
    } else {
        return nil
    }
}

score 3 · Answer 3 · answered May 24 '16 at 13:32

Use Asynchronous mechanism called GCD in iOS to dowload image without affecting your main thread.

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

    // Download IMAGE using URL
    NSData *data = [[NSData alloc]initWithContentsOfURL:URL];

    // COMPOSE IMAGE FROM NSData
    UIImage *image = [[UIImage alloc]initWithData:data];

    dispatch_async(dispatch_get_main_queue(), ^{
        // UI UPDATION ON MAIN THREAD
        // Calcualte height & width of image
        CGFloat height = image.size.height;
        CGFloat width = image.size.width;

    });
});

I am not downloading actually. I am using AFNetworking cachying like [imageView setImageForState:UIControlStateNormal withURL:[NSURL URLWithString:object] placeholderImage:[UIImage imageNamed:@"DefaultProductImage"]]; — Muhammad Zeeshan Anwar, May 25 '16 at 14:47

score 1 · Answer 4 · answered Jul 13 '18 at 12:25

For Swift 4 use this:

let imageURL = URL(string: post.imageBigPath)!
let source = CGImageSourceCreateWithURL(imageURL as CFURL,     
let imageHeader = CGImageSourceCopyPropertiesAtIndex(source!, 0, nil)! as NSDictionary;
print("Image header: \(imageHeader)")

The header would looks like:

Image header: { ColorModel = RGB; Depth = 8; PixelHeight = 640; PixelWidth = 640; "{Exif}" = { PixelXDimension = 360; PixelYDimension = 360; }; "{JFIF}" = { DensityUnit = 0; JFIFVersion = ( 1, 0, 1 ); XDensity = 72; YDensity = 72; }; "{TIFF}" = { Orientation = 0; }; }

So u can get from it the Width, Height.

score 0 · Answer 5 · answered May 24 '16 at 09:29

0

you can try like this:

NSData *data = [[NSData alloc]initWithContentsOfURL:URL]; 
UIImage *image = [[UIImage alloc]initWithData:data];
CGFloat height = image.size.height;
CGFloat width = image.size.width;

answered May 24 '16 at 09:29

Suraj Sukale

1,778
1
12
19

6

This is a synchronous way. It will stuck the UI until it gets the data. – Muhammad Zeeshan Anwar May 24 '16 at 11:56

How to get Image size from URL in ios

5 Answers5