UIViewContentMode options in Swift - ios

I'm having a bit of trouble understanding and/or implementing images with a particular fill type into my project. The background is a UIImageView. Here is a screenshot of my app's "Profile" page
The image is pulled in from Facebook, using the Facebook graph. The image is a 720x720 square.
The image looks decent in the smaller circle, however the background version doesn't fill the way I would expect it to. Despite having tried all of the "ScaleAspect______" methods, the background looks as shown.
My understanding was that ScaleAspectFill would do what I want, which is the scale the image down until either X or Y is the size of the frame and then crop the remainder out. That's how it's shown on the Apple Docs.
I have added and removed clipsToBounds to the ImageView, neither of which made any changes.
The image I'm working with can be found here:
https://graph.facebook.com/10152976336695409/picture?width=640&height=640
downloaded
EDIT: Clarified that the background is a UIImageView type.

Related

scale type or contentMode of Image in UIButton is not working

I was trying to put an image in UIButton and the image would fill up the space keeping the aspect ratio intact. I was not able to apply the content mode. Please see the screenshot
I also tried from the code and it's not working as well
myButton.imageView?.contentMode = .scaleAspectFill
By changing the alignment, the image takes the whole space but it does not keep the aspect ratio and content mode does not work as well.
What's causing your problem is how small the image is. There are two things you can do. One option is to set the image you have now as the background image and then change the button's constraints to get the proportions right. You won't be able to have the button be the size you have it now, though, because the image will be all stretched out.
The other thing you could do is find a bigger or different image of that symbol (square.and.arrow), rather than using the one already loaded into Xcode.

ios swift crop image to the size of device

everyone. For the App on which I am working I want to let users be able to select own image and set it as the background of App. The Problem I face is how to let users crop the image fitting the size of device's screen if the image is larger. Another question is if users want to select a pretty small image and set it as the background, should I just say no to it?
We don't know how you've set up your app so we can only speculate. BUT you could create a UIImageView that is behind everything else. When the user selects a picture just set that picture to that image views background....
As for the cropping...if you use constraints and tell that image view to be 0 from top, 0 from left, 0 from right, and 0 from bottom it will automatically resize based on size of device. Also you would need to set that image views scale property so the image doesn't distort...
Finally, usually when you have images on the device you create a 1x, 2x, and 3x size and Xcode will automatically use the appropriate size ...but again we have no idea how your app works...so if the user is trying to use an image that is 15 pixels by 15 pixels and have it fill the whole screen...it's going to look pixelated
You might want to write a function that gets the image size and if it fails to meet specifications you set...tell the user somehow (UIAlert...)
All of that being said...
Folk here on Stack Overflow generally don't take time to help on questions that have no code example shown...generally speaking you attempt to figure it out first and then post...so show code that you've tried, or take a screen shot of how your View Controller looks like...

Toolbar button image suppressed

I have a viewcontroller with a toolbar with 2 bar button items. The image on one is a simple flat icon. The other is a complex image reduced to 28x28 pixels from a 256x256 image. The complex image shows up as a blob as shown below. The actual image is also show in the picture. It is not clear what I am doing wrong. The project code is available in the following link:
Project code
John Griffith on Apple Developer Forum provided this explanation which made a lot of sense. I need to redesign my icons if I want to proceed along this line:
Toolbar images are normally rendering mode "template" - only the alpha channel is used. Any non-transparent pixels are drawn in the bar's tint color. It may be possible to create a UIImage with rendering mode "always original" to preserve the look of your image, but then it won't respond to changes in tint color.
I have downloaded your project. The first thing you should do is to move your image files into the images.xcassets folder. Read here to understand why.
The image you are trying to display is actually just a red rectangle:
As you can see, opening in another program also just displays it as a red rectangle. Be sure to use the correct Image file. The problem lies not with your project but rather the image file you are using.

UIImage being stretched when copying from UIPasteboard

I have a valid image with the right content size, however I have noticed when I try to paste this image to WhatsApp or through iMessage the image get's significantly stretched. I have looked at the image and it seams to be fine on UIImageview, but somehow it gets stretched in particular to outer controls.
Is there anyway to fix this issue?
When copying an image make sure to modify the imageView's mode. There are different modes, like Aspect Fit, Scale to fill and so on.
If let's say the image is 500x300 and your imageView's size is set to 350x230 and mode to Scale to fill, it will end up stretched. Try to fiddle around and see what works for you. Most of the times i choose Aspect Fit.
Try that out.
BTW. You can find it under inspection tab in design editor or set it programmatically if you choose so.

UiPopOver in Iphone

I have an image of the UiPopOver
I want to make it bigger or smaller based on the text that i want to display in this. My plan is that i will adda text view inside the image view and scale it accordingly. I am facing difficulty in scaling the image to bigger or smaller.
For example if i know that the text that will fit in it have size of CGSize(80, 100), the how i can scale this image view to a specified size without pixelation.
Any help will be highly appreciated.
you can make the resizable image with the following insets (their positions marked by the colourful lines below), that will do the job for you:
you can find more information about how you can me a resizable image in the UIImage Class Reference, the related method's name is –resizableImageWithCapInsets:.

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