I am trying to create blur effect on the UIView as well as I want to add vibrancy Effect so that I can highlight my buttons and use them. I am trying to learn via apple docs and couple of tutorials but unable to get in the following steps I am doing are correct.
Steps 1. I am creating a blur view adding it as subview to present view so that it looks blur.
Step 2 . Then i am creating a vibrancy view for the blur effect and adding it to contentview of blurview.
But i am unable to get the blur effect, can anyone help me to understand
1. If the following steps are correct.
2. If not how should ideally the sequence be.
3. How to highlight those buttons and use them. ( I am attaching the snaphot of my storyboard too).
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UIBlurEffect *blurEffect= [UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight];
UIVisualEffectView *blurView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
[blurView setUserInteractionEnabled:false];
[self.view addSubview:blurView];
UIVibrancyEffect *vibrancyEffect = [UIVibrancyEffect effectForBlurEffect:blurEffect];
UIVisualEffectView *vibrancyView = [[UIVisualEffectView alloc] initWithEffect:vibrancyEffect];
[vibrancyView setTranslatesAutoresizingMaskIntoConstraints:NO];
//[vibrancyView.contentView addSubview:s];
[blurView.contentView addSubview:vibrancyView];
}
The chief problem with your code is that you have neglected to give your blur view any size. Therefore it has zero size. Thus you will not see it do anything; it is, in effect, invisible. The most it can blur would be a single pixel behind it, and you are unlikely to notice that.
You are not setting the frame for your blurView and vibrancyView.
blurView.frame = self.view.frame;
vibrancyView.frame = self.view.frame;
Related
I looked at this: How to use UIVisualEffectView? but I don't really understand how to apply it to my situation, after even looking at the comments.
I have a class SpecialHUD which is a subclass of HUDView which is a subclass of UIView. HUDView has its layer.contents set to be a background image (certain rectangle with rounded edges), and text in a label added as a subview. I can't change HUDView. I only need to change SpecialHUD.
I want the background image to act as the thing that blurs whatever is behind it - I can't get rid of the background image.
How do I use the UIVisualEffectView with my SpecialHUD?
I tried adding this to an update method in my SpecialHUD:
UIVisualEffect *blurEffect;
blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *visualEffectView;
visualEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
visualEffectView.frame = self.bounds;
[self addSubview:visualEffectView];
[[visualEffectView contentView] addSubview:self.label];
But it blurs everything in the rectangular container, and disregards the image — I'm not sure how to make everything work together.
I am trying to present a view with a blurred transparent background over an existing view. I am able to get the desired effect during the presentation animation, but once the blurred view is fully presented, it becomes opaque.
Here's how I am presenting it:
if (!UIAccessibilityIsReduceTransparencyEnabled()) {
UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *blurEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
blurEffectView.frame = self.view.bounds;
[blurEffectView setOpaque:NO];
[self.view insertSubview:blurEffectView atIndex:0];
[blurEffectView setTranslatesAutoresizingMaskIntoConstraints:false];
}
In my blurred view, I have set the background color to clear color and opaque to NO. Any thoughts?
Note that any UIVisualEffectView with a UIBlurEffect will be opaque if the "Reduce Transparency" accessibility setting is on.
(Settings > General > Accessibility > Increase Contrast > Reduce Transparency)
(Which is what your are actually checking with your if (!UIAccessibilityIsReduceTransparencyEnabled()) statement.)
I wound up writing a custom presentation controller. Never found a way to do this with standard presentations.
In the view where I want the effect viewDidLoad:
//Custom Modal Presentation
[self setModalPresentationStyle:UIModalPresentationCustom];
//blur the controlContainerView
if (!UIAccessibilityIsReduceTransparencyEnabled()) {
UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:[self blurStyle]];
UIVisualEffectView *blurEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
blurEffectView.frame = self.controlContainerView.bounds;
[blurEffectView setOpaque:NO];
[self.controlContainerView insertSubview:blurEffectView atIndex:0];
[blurEffectView setTranslatesAutoresizingMaskIntoConstraints:false];
}
Invoking the above view:
//in .h
#property (nonatomic) id<UIViewControllerTransitioningDelegate> transitioningDelegate;
//In .m
BlurViewController *blurVC = [self.storyboard instantiateViewControllerWithIdentifier:#"blurView"];
_transitioningDelegate = [[MyCustomOverlayDelegate alloc] init];
[blurView setModalPresentationStyle:UIModalPresentationCustom];
[blurView setTransitioningDelegate:[self transitioningDelegate]];
[blurView setBlurStyle:UIBlurEffectStyleLight];
[self presentViewController: blurView animated:YES completion:nil];
You will also need to import the entire stack of presentation controller classes. For me, these were OverlayDelegate, OverlayTransitionAnimator, and OverlayPresentationController. This is where the real work is.
If you can, check out WWDC 2014 session 228 "A look inside presentation controllers". Custom presentations are covered about half-way through. It was what I used to base my custom stack on and reasonably straight forward.
From the documentation:
A UIBlurEffect object applies a blurring effect to the content layered behind a UIVisualEffectView.
So I think the problem is your clear backgroundColor. If you have some kind of content or coloring behind your UIVisualEffectView, it should work.
UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight];
UIVisualEffectView *blurredView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
This simple code snippet does work for me. In the ViewController I want to show the blurred effect I just call [[self view] addSubView:blurredView]
Simply set the view controller which holds the blurred view like this:
myViewController.modalPresentationStyle = UIModalPresentationOverCurrentContext;
It prevents optimisation which removes views from the view hierarchy which in turn makes the blurred view presented first and thus making it opaque.
I want to create a black UIView with transparent circles.
I think about create one view (with black color and transparence 50%), and add multiple circles inside of it, but I don't know how to set the transparence for each. I know how to create a circle View (an example: how to draw a custom uiview that is just a circle iphone-app).
I want to do is something like iShowcase library but with multiple dots:
Any clue? thanks.
SOLVED
I took a look to the code of iShowcase library and I solved my probblem. now, I am working in a library based in iShowcase library.
I will post here when I finish it.
Please have a look of below link hope this will helpful for you.
Link : Here is Answer to set shadow in your view.
Use alpha for your circleView. As in your link example,then add as subviews in yourmainview:
UIView *circleView = [[UIView alloc] initWithFrame:CGRectMake(10,20,100,100)];
circleView.alpha = 0.5;
circleView.layer.cornerRadius = 50;
circleView.backgroundColor = [UIColor whiteColor];
[yourmainview addSubview: circleView];
Btw in your picture I think white circles have 100% alpha. You can use individual alpha for each circleView, or use a randomizer :)
As for updated example why don't you add more buttons and showcase in your h file, synthesize them and use multiple instances .... showcase setupShowcaseForTarget:btn_custom_1 title:#"title" details:#"other"]; ? I think you should modify main classes, becouse what you want are different containerView for multiple views [circles].
Using modifyed iShowcase.m [- (void) calculateRegion], and different views as containers, I was able to make something like: http://tinypic.com/view.php?pic=2iwao6&s=8#.VLPTRqYsRE8 So the answer is: use custom views for multiple showcase [ex [showcase2 setContainerView:self.view2];], then custom frame for each showcase [ showcase2.frame = CGRectMake(0,0,100,100);] I don;t habe time to fine tuning the example, but yes, you can achieve desired result...
I finally solved my question inspired by iShowCase library I did this simple class and Upload to github.
https://github.com/tato469/FVEasyShowCase
Simplest what you can do is to have your main view (black 50% transparant) and add shapes to the mask layer of that.
So basically:
//Set up your main view.
UIView* mainView = [UIView new];
mainView.backgroundColor = [UIColor blackColor];
mainView.alpha = 0.5;
UIView* circle1 = [YourCircleClassHere new];
UIView* circle2 = [YourCircleClassHere new];
UIView* circle3 = [YourCircleClassHere new];
UIView* container = [UIView new];
[UIView addSubview:circle1];
[UIView addSubview:circle2];
[UIView addSubview:circle3];
//Make a new layer to put images in to mask out
CALayer* maskLayer = [CALAyer layer];
//Assign the mask view to the contents layer.
maskLayer.contents = (id)container;
//This will set the mask layer to the top left corner.
maskLayer.frame = CGRectMake(0,0,container.frame.size.width,container.frame.size.height);
//Lastly you assign the layer to the mask layer of the main view.
mainView.layer.mask = maskLayer;
//Applies basically the same as clipToBounds, but a bit reversed..
mainView.layer.mask = true/false;
On a sidenote:
I achieved this with images "contents = (id) [UIImage CGImage]", but I'm sure it should work with UIViews as well.
Also mind some mistakes, since I just wrote this from my mind, also I didn't test this out.. So keep me updated if it works/!works ^_^
I have a UIVisualEffectView which is causing some strange artefacts right when it appears. The UIVisualEffectView is added in code after the view loads because it's not available in iOS 7.
Look at the blurred text background over the street view image: http://s.swic.name/Z3UL
The blur takes a good 0.1 seconds to appear, and before that it's just a lower resolution background shining through like the blur hasn't been calculated yet.
Any idea what is going on? I'm adding the blur in awakeFromNib using this code
- (void)addBlurWithColor:(UIColor *)color andStyle:(UIBlurEffectStyle)style andVibrancy:(BOOL)vibrancy
{
if (UIDevice.supportsVisualEffects && NSClassFromString(#"UIVisualEffectView") && !UIAccessibilityIsReduceTransparencyEnabled()) {
self.backgroundColor = color;
UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:style];
UIVisualEffectView *visualEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
visualEffectView.frame = self.bounds;
visualEffectView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
NSArray *subviews = self.subviews;
[self addSubview:visualEffectView];
[self sendSubviewToBack:visualEffectView];
if (vibrancy) {
UIVibrancyEffect *vibrancyEffect = [UIVibrancyEffect effectForBlurEffect:blurEffect];
UIVisualEffectView *vibrancyEffectView = [[UIVisualEffectView alloc] initWithEffect:vibrancyEffect];
[vibrancyEffectView setFrame:self.bounds];
vibrancyEffectView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
for (UIView *subview in subviews) {
[vibrancyEffectView.contentView addSubview:subview];
}
[[visualEffectView contentView] addSubview:vibrancyEffectView];
}
}
}
Edit: The video just has slow animations enabled, the transition is a regular push segue.
Edit2: I get the same strange behaviour if i just drag drop a "UIVisualEffectView with Blur" in Interface Builder, so the code above shouldn't be to blame.
Found the problem, when the view appears I'm reloading the tableview inside [UIView transitionWithView:...] which alters the alpha which apparently is a big no-no when it comes to UIVisualEffectViews!
According to UIVisualEffectView Documentation;
When using the UIVisualEffectView class, avoid alpha values that are
less than 1. Creating views that are partially transparent causes the
system to combine the view and all the associated subviews during an
offscreen render pass. UIVisualEffectView objects need to be combined
as part of the content they are layered on top of in order to look
correct. Setting the alpha to less than 1 on the visual effect view or
any of its superviews causes many effects to look incorrect or not
show up at all.
https://developer.apple.com/library/ios/documentation/uikit/reference/UIVisualEffectView/index.html
I would like to obtain this effect (http://stackoverflow.com/questions/7023271/how-to-adjust-drop-shadow-dynamically-during-an-uiimageview-rotation) but from a more complex image than just a red square ! If the link ever gets broken, it's a about how to adjust drop shadow dynamically during an UIImageView rotation.
So I tried implementing something but I just can't get the shadow in a separate layer... Here is my code, very simple, but doesn't work:
// here is my code
- (void)viewDidLoad {
[super viewDidLoad];
testView = [[UIImageView alloc] initWithImage: [UIImage imageNamed:#"handNoShadow.png"]];
testViewShadow = [[UIView alloc] initWithFrame:testView.frame];
testViewShadow.layer.shadowPath = [[testView layer] shadowPath];
testViewShadow.layer.shadowOpacity = 1.0;
testViewShadow.layer.shadowOffset = CGSizeMake(10, 10);
testViewShadow.layer.shadowRadius = 5.0;
[self.view addSubview:testViewShadow];
[self.view addSubview:testView];
}
PS: i did #import
I do get an image but no shadow... =(
Any lead, help, code, link... is welcome !
Thanks
possible cause:
your testViewShadow.clipToBounds property is set to YES (should be NO)
your testViewShadow do the drawing of the shadow correctly but another UIView is on top and mask it. Check your Z order. Either the order in Storyboard/Nib file (or the order you added the subviews programmatically). Last in the list (or last one added) is on top. For my app I had to put the UIView that need a shadow last so that no other view mask it.