I have an UIView for login purposes centered in the middle of the screen. It is constrained to a 0.25 height of the surrounding view (covering the whole window)
I noticed, that if I create an UIVisualEffectView (via the method blurBackgroundForView(_)as background for the UIView, that it is too small (check the code how I create the UIVisualEffectView) although it has the same frame.
You can see the effect, when you change the backgroundColor to .greenColor.
The View is higher than the Blureffect.
ViewController
override func viewWillAppear(animated: Bool) {
AnimationHelper.blurBackgroundForView(self.view)
view.backgroundColor = .greenColor()
}
blurBackgroundForView(_)
static func blurBackgroundForView(view: UIView!){
view.backgroundColor = .clearColor()
let blurEffect = UIBlurEffect(style: .Light)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = view.bounds
view.insertSubview(blurEffectView, atIndex: 0)
}
Frames are not guaranteed to be set by auto layout in viewWillAppear.
Try setting the blur view's frame in viewDidLayoutSubviews instead. Alternatively, you can directly set the autoresizing mask on your blur view so that it resizes when its superview resizes:
blurView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
You should also call the super method in viewWillAppear.
Related
I have the following code to blur out an image.
let blurEffect = UIBlurEffect(style: .light)
let blurredEffectView = UIVisualEffectView(effect: blurEffect)
blurredEffectView.frame = imageBlur.bounds
//blurredEffectView.alpha = 0.8
imageBlur.addSubview(blurredEffectView)
imageBlur.sd_setImage(with: URL(string: item._galleryURL), placeholderImage: UIImage(named: ""))
However, when I run the code, I am seeing this for the first two elements in the UITableView.
When I scroll down and then back up again, they will fix...
What can be causing this bug?
When you create the blur view in tableView cell you the view not now the exact size. So in the first create of screen it looks not okay but when you scroll down and up it recycles and know it size it becomes okay.
So you can solve it by giving size in layoutsubviews() function like
override func layoutSubviews() {
super.layoutSubviews()
blurredEffectView.frame = imageBlur.bounds
}
A UIViewController I'm presenting has a UIImageView, namely backgroundImageView, to be the VC's background and set to fill the whole screen.
I want the UIImageView to be presented with a dark blur effect provided by iOS but the following sizing issue temporarily occurs(on device but not on the simulator) when I first present the view controller:
Inside viewDidLoad():
// `locationImage` is passed during the segue
backgroundImageView.image = locationImage
backgroundImageView.contentMode = .scaleAspectFill
let blurEffect = UIBlurEffect(style: .dark)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = backgroundImageView.bounds
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
backgroundImageView.addSubview(blurEffectView)
The above view controller's modalPresentationStyle is set to be as currentContext.
If I temporarily remove the blur effect, I see that the background image I gave the view controller got properly set. However once the blur effect is applied, sizing issues occur momentarily.
What exactly is causing this?
Try to set the frame of blurEffectView inside viewWillLayoutSubviews() or in viewDidLayoutSuviews()
here you can find more information about viewcontroller's lifecycle
I have created a UITableViewController and each cell has a blur effect applied to them using UIVisualEffectView. I also have a blurred background that is created in the UITabBarViewController that the table view is linked to. The extra blur effect applied to each cell adds a nice touch to the UI I am designing, and it works for the most part.
The Issue
Everything works fine until I delete an item from the table. Doing so causes the whole table view to appear damaged. Everything returns to normal after the delete animation has been completed.
I have tried applying the UIVisualEffectView via code and the storyboard, and the problem is consistent either way. When using code, I apply the effect here like this:
// 'cell' is the cell being configured in tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .Light))
visualEffectView.frame = cell.bounds
cell.insertSubview(visualEffectView, atIndex: 0)
Note: After doing more testing, I have narrowed down the problem. When setting a cell to a clear color via the storyboard or in code using cell.backgroundColor = UIColor.clearColor(), the damaged animation appears. In fact, it does this for any color that has some, or complete transparency. When there is no transparency, the issue stops, but then the background from the UITabBarController is no longer visible.
My Question
How can I fix the damaged animation while keeping a similar/same look?
And if you want to see how I added the blur to the UITableViewController, here it is:
class MainTabBarViewController: UITabBarController, UITabBarControllerDelegate {
var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
imageView = UIImageView(image: UIImage(named: "Sunset"))
imageView.frame = self.view.bounds
imageView.contentMode = .ScaleAspectFill
view.insertSubview(imageView, atIndex: 0)
let blurEffect = UIBlurEffect(style: .Light)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = imageView.bounds
view.insertSubview(blurEffectView, aboveSubview: imageView)
}
//...
And here is what damaged animation looks like on the simulator (same thing happens on a physical device too):
I have set a background image for my UITableViewController and then added a blur effect with the following code:
var blur = UIBlurEffect(style: UIBlurEffectStyle.Dark)
var blurView = UIVisualEffectView(effect: blur)
blurView.frame = self.view.bounds
self.view.insertSubview(blurView, atIndex: 0)
When I scroll down, the background image is still there but the blur effect is only there for the first few cells that fit into the view at a time. How can I make it so the blur effect is there as I scroll?
I tried adding the blur effect to each cell, but that makes it look really weird.
For UITableViewControllers self.view is the UITableView it self. That means any subview you add to self.view will scroll along with the content of the table view.
You could either make an own UIViewController, set up UITableView manually and place it in front of the blur view (instead of placing the blur view inside the table view) or you could move the blur view's location when the table view is scrolled.
To move the blur view to compensate for the table view's offset you can do something like this:
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
var blurViewFrame = CGRect()
blurViewFrame.size = view.bounds.size
blurViewFrame.y = tableView.contentOffset.y
blurView.frame = blurViewFrame
}
I have a little problem: I'd like to set an image to background in a TableViewController. I tried this:
class SquadreController: UITableViewController {
override func viewDidLoad()
{
super.viewDidLoad()
var sfondo = UIImage(named: "sfondo")
self.view.backgroundColor = UIColor(patternImage: sfondo!)
}
Then I give the blur effect to the view, like this:
let blur = UIBlurEffect(style: UIBlurEffectStyle.Light)
let blurView = UIVisualEffectView(effect: blur)
blurView.frame = self.view.bounds
view.addSubview(blurView)
But there is a big problem. I'm working in a TableView and the TableView, TableCell, NavigationItem, etc. have all disappeared after I apply the blur. Can someone help me?
Thanks a lot!
Try using view.insertSubView(blurView, atIndex: 0) instead of view.addSubview(blurView) as! UIImageView
This question is an older question and Epic Defeater's response does in a way work, there is a much better way to accomplish this. Instead of adding blurView, you need to override the background view. Specifically you need to override tableView.backgroundView.
let blur = UIBlurEffect(style: .light)
let blurView = UIVisualEffectView(effect: blur)
blurView.frame = self.view.bounds
tableView.backgroundView = blurView
This will only work if you have set the background color to clear.
We can also add a subview below or above any other views using insertSubview
//Inserting below your subView
self.view.insertSubview(subview1_name, belowSubview: subview2_name)
//Inserting above your subView
self.view.insertSubview(subview1_name, aboveSubview: subview2_name)
/// You can use any of your view, instead of self.view