iOS get width height of jpg file

问题

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?

回答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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回答2:

UIImage has the property size

image.size.width
image.size.height

回答3:

You can achieve this using UIImage Size property.

Have a look at below:

UIImage *image;

NSLog(@'Width=%f and Height: %f',image.size.width, image.size.height);

Store your web image into "image" object and you will get Width & Height of the image.

Cheers!

来源：https://stackoverflow.com/questions/14620279/ios-get-width-height-of-jpg-file