iOS get width height of jpg file

Question

In my iOS app, I'm downloading jpeg images from the web, and I'm wondering how to find the correct width and height of the image so I can display it properly in my iOS app.

For example,

How do I get the width and height of this jpg image?

Answer 1

you can get Image Height and Width like:-

NSData *imageData = [NSData dataWithContentsOfURL:imageUrl];
UIImage *image = [UIImage imageWithData:imageData];
NSLog(@'image height: %f',image.size.height);
NSLog(@'image width: %f',image.size.width); 

UPDATE:-

as per your URL you can get like:-

NSString *ImageURL = @"http://gigaom2.files.wordpress.com/2013/01/teacher-classroom.jpg";


    ImageURL =[ImageURL stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];

    NSLog(@"img url ==%@",ImageURL);
    NSURL *imageUrl =[NSURL URLWithString:ImageURL];
    NSData *imageData = [NSData dataWithContentsOfURL:imageUrl];
    UIImage *image = [UIImage imageWithData:imageData];
    [inView setImage:image];
    NSLog(@"image height: %f",image.size.height);

    [lbl1 setText:[NSString stringWithFormat:@"%2.0f",image.size.height]];
    [lbl2 setText:[NSString stringWithFormat:@"%2.0f",image.size.width]];

your Screen look like:-

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Answer 2

UIImage has the property size

image.size.width
image.size.height