iOS获取jpg文件的宽度高度

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

Answer 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!