ios - SizeToFit on UIImageView not working

ios uiimageview sizetofit
Ashley Staggs picture Ashley Staggs · May 4, 2012 · Viewed 12.8k times · Source

I have a UIImageView which loads in images from the documents directory on the ios file system .

The problem is that when I call

[imageView sizeToFit];

It does not work. I think it is because the image hasn't loaded fully at that point and so the sizeToFit part is called before it has the image width & height.

Could someone point me in the direction of a fix please.

Here is my code:

imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.image = [UIImage imageWithContentsOfFile:[FileOperations getLibraryPath:[NSString stringWithFormat:@"%d.png", listData.imageId]]];
[imageView sizeToFit];
[imageScroll setContentOffset:CGPointMake(0, 0)];
imageScroll.contentSize = imageView.frame.size;
imageScroll.decelerationRate = UIScrollViewDecelerationRateFast;
imageScroll.minimumZoomScale = 1;
imageScroll.maximumZoomScale = 2;
[imageScroll setZoomScale:imageScroll.minimumZoomScale];
[imageScroll addSubview:imageView];

Thanks, Ashley

Answer

Costique picture Costique · May 4, 2012

Check the image size:

NSLog(@"%@", NSStringFromCGSize(imageView.image.size));

You may want to set imageView frame based on the image size manually, for example, if the image is too large to fit the imageView's superview.

Related questions

UIImageView aspect fit and center

I have an image view, declared programmatically, and I am setting its image, also programmatically. However, I find myself unable to set the image to both fit the aspect and align centre to the image view. In other words, I …

Read More
How can I change the image displayed in a UIImageView programmatically?

I have an IBOutlet to a UIImageView, but when I look at the UIImageView doc, I can't see any hints about programmatically changing it. Do I have to fetch an UIImage object from that UIImageView?

Read More
How do you create a UIImage View Programmatically - Swift

I'm trying to create a UIImage View programmatically, I have a new view and I tried doing this let imageName = "yourImage.png" yourview.backgroundColor = UIColor.colorWithPatternImage(UIImage(named:imageName)) this did not work because I don't know what this should …

Read More