iOS UIScrollView not scrolling on dynamic height

[bradnet]

Hi Guys

Got a little question that someone may have a simple answer for, i'm using tableview to open a detail view with a scrollview containing an image that could be larger than the page, here is the line that i added

[scrollView setContentSize:CGSizeMake(320, _image.bounds.size.height)];

using this method the view wont scroll but if i manually specify the height it will scroll fine

[scrollView setContentSize:CGSizeMake(320, 550)];

my problem is that not all of my images will be 550 heigh some might be over 1000 does anyone know why this isn't working.

Thanks
Brad

 

[robbieduncan]

Use NSLog to log the image view height when you are using it to set the scrollview content size. It may not be what you expect...

 

[bradnet]

I've checked the NSLog and the size it's outputting is the size of the imageview on the interfacebuilder screen but i want this size to be dynamic to the size of the image i thought this was the correct method.

Thanks
Brad

 

[robbieduncan]

Then you'll have to set the size of the image view to the size of the image (in the code).

 

[bradnet]

Is there anyway you can point me in the right direction i have an image downloaded from a url and displayed on the screen which is sometimes longer than the screen so i have the mediaURL how would i reference the url to get the image height. is it an NSUrl request.

Thanks
Brad

 

[robbieduncan]

how would i reference the url to get the image height.

You wouldn't. You'd use the obvious method of UIImage.

 

[bradnet]

managed to solve this problem but in order to do it i had to load the data from the url into a nsdata and then load this data into a uiimage and then measure the UIImage.

Here's the code to help any others out

NSString * mediaUrl = [[[self appDelegate]currentlySelectedBlogItem]mediaUrl];
NSData* imageData;
imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:mediaUrl]];			
UIImage * imageFromImageData = [[UIImage alloc] initWithData:imageData];
NSLog(@"DetailScreen applicationFrameSize: %.0f", imageFromImageData.size.height);
[scrollView setContentSize:CGSizeMake(320, imageFromImageData.size.height)];

Thanks
for the help