I want my text to appear .white when in normal mode and .black when in dark mode. How do I do that? .label only makes the text .black in normal and .white in dark mode but I want it the other way around.
Anyone have a solution for that?
let myLabelColor = UIColor(dynamicProvider: { $0.userInterfaceStyle == .dark ? .black : .white })
Since iOS 13, UIColor has an init(dynamicProvider:)
Creates a color object that uses the specified block to generate its color data dynamically.
https://developer.apple.com/documentation/uikit/uicolor/3238041-init
If you will be creating a lot of dynamic colors, you might want to make a convenience init—that saves you the typing, and your intention is more clear to the reader:
extension UIColor {
/// Creates a color object that responds to `userInterfaceStyle` trait changes.
public convenience init(light: UIColor, dark: UIColor) {
guard #available(iOS 13.0, *) else { self.init(cgColor: light.cgColor); return }
self.init(dynamicProvider: { $0.userInterfaceStyle == .dark ? dark : light })
}
}
Usage: let myLabelColor = UIColor(light: .white, dark: .black)
(Note that you can use any other trait from the provided trait collection. For example, you could return a different color if the size class changes)
In my assets I created a new "Color Set". For chose white for "Any Appearance" and black for "Dark". Then I gave this Image Set a name and called it like so:
text.textColor = UIColor(named: "ImageSet1")
In a couple of my apps, I have an image covering the view in the background. In my asset catalog, my image has an Any, light and dark variation. In iOS 13, when I launch the app, the correct light or dark mode image is displayed according to the mode set. However, when I switch the mode while the app is running, the image does not change. All other properties change (colors etc) for all controls, but not the image.
I have tried the following with a layoutIfNeeded() and/or layoutSubviews() inside the traitCollectiosnDidChange block:
override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
guard let previousTraitCollection = previousTraitCollection else {return}
if #available(iOS 13.0, *) {
if previousTraitCollection.hasDifferentColorAppearance(comparedTo: traitCollection) {
print("Changed mode")
self.view.layoutIfNeeded()
self.view.layoutSubviews()
}
}
}
and the Change mode is definitely triggered but the layout does not change.
Is there a way to make sure that the image also displays the correct one?
OK. To answer my own question. I was applying .withHorizontallyFlippedOrientation() to my image and setting it in ViewDidLoad. When I changed the trait color mode, this image was not getting change.
The solution was to to reset the image AND the flip property when the differentColorAppearance triggers. Like this
override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
guard let previousTraitCollection = previousTraitCollection else {return}
if #available(iOS 13.0, *) {
if previousTraitCollection.hasDifferentColorAppearance(comparedTo: traitCollection) {
image2.image = UIImage(named: "CourseImage")?.withHorizontallyFlippedOrientation()
}
}
}
Is it possible to change the background color of a AVPlayerView when used in a macOS application. I want to do this to remove the black bars when playing a video.
I've tried the following:
videoView.contentOverlayView?.wantsLayer = true
videoView.contentOverlayView?.layer?.backgroundColor = NSColor.blue.cgColor
also tried adding these:
view.wantsLayer = true
videoView.wantsLayer = true
but the background is still black.
AVPlayerView does not have layer after the initialization or setting wantsLayer property, but creates it later at some point. I was able to change the background with the next code in my AVPlayerView subclass:
override var layer: CALayer? {
get { super.layer }
set {
newValue?.backgroundColor = CGColor.clear
super.layer = newValue
}
}
videoView.contentOverlayView?.layer?.setNeedsDisplay()
try this maybe you just need to update the view. However if you would post more of your code I could try to help more.
I'm currently working on an iOS application in Swift, and I need to achieve the text effect shown in the attached picture.
I have a label which displays some text wrote by the user, and I need to make the text background corners (not the label background) rounded.
Is there a way to do that?
I'd search the web and Stackoverflow but with no luck.
Thank you.
Here is some code that could help you. The result I got is quite similar to what you want.
class MyTextView: UITextView {
let textViewPadding: CGFloat = 7.0
override func draw(_ rect: CGRect) {
self.layoutManager.enumerateLineFragments(forGlyphRange: NSMakeRange(0, self.text.count)) { (rect, usedRect, textContainer, glyphRange, Bool) in
let rect = CGRect(x: usedRect.origin.x, y: usedRect.origin.y + self.textViewPadding, width: usedRect.size.width, height: usedRect.size.height*1.2)
let rectanglePath = UIBezierPath(roundedRect: rect, cornerRadius: 3)
UIColor.red.setFill()
rectanglePath.fill()
}
}
}
Xavier solution works great.
If you want update background in real-time, use: textView.setNeedsDisplay()
I was wondering how to set the radius/blur factor of iOS new UIBlurEffectStyle.Light? I could not find anything in the documentation. But I want it to look similar to the classic UIImage+ImageEffects.h blur effect.
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
let blur = UIBlurEffect(style: UIBlurEffectStyle.Light)
let effectView = UIVisualEffectView(effect: blur)
effectView.frame = frame
addSubview(effectView)
}
Changing alpha is not a perfect solution. It does not affect blur intensity. You can setup an animation from nil to target blur effect and manually set time offset to get desired blur intensity. Unfortunately iOS will reset the animation offset when app returns from background.
Thankfully there is a simple solution that works on iOS >= 10. You can use UIViewPropertyAnimator. I didn't notice any issues with using it. I keeps custom blur intensity when app returns from background. Here is how you can implement it:
class CustomIntensityVisualEffectView: UIVisualEffectView {
/// Create visual effect view with given effect and its intensity
///
/// - Parameters:
/// - effect: visual effect, eg UIBlurEffect(style: .dark)
/// - intensity: custom intensity from 0.0 (no effect) to 1.0 (full effect) using linear scale
init(effect: UIVisualEffect, intensity: CGFloat) {
super.init(effect: nil)
animator = UIViewPropertyAnimator(duration: 1, curve: .linear) { [unowned self] in self.effect = effect }
animator.fractionComplete = intensity
}
required init?(coder aDecoder: NSCoder) {
fatalError()
}
// MARK: Private
private var animator: UIViewPropertyAnimator!
}
I also created a gist: https://gist.github.com/darrarski/29a2a4515508e385c90b3ffe6f975df7
You can change the alpha of the UIVisualEffectView that you add your blur effect to.
let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Light)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.alpha = 0.5
blurEffectView.frame = self.view.bounds
self.view.addSubview(blurEffectView)
This is not a true solution, as it doesn't actually change the radius of the blur, but I have found that it gets the job done with very little work.
Although it is a hack and probably it won't be accepted in the app store, it is still possible. You have to subclass the UIBlurEffect like this:
#import <objc/runtime.h>
#interface UIBlurEffect (Protected)
#property (nonatomic, readonly) id effectSettings;
#end
#interface MyBlurEffect : UIBlurEffect
#end
#implementation MyBlurEffect
+ (instancetype)effectWithStyle:(UIBlurEffectStyle)style
{
id result = [super effectWithStyle:style];
object_setClass(result, self);
return result;
}
- (id)effectSettings
{
id settings = [super effectSettings];
[settings setValue:#50 forKey:#"blurRadius"];
return settings;
}
- (id)copyWithZone:(NSZone*)zone
{
id result = [super copyWithZone:zone];
object_setClass(result, [self class]);
return result;
}
#end
Here blur radius is set to 50. You can change 50 to any value you need.
Then just use MyBlurEffect class instead of UIBlurEffect when creating your effect for UIVisualEffectView.
Recently developed Bluuur library to dynamically change blur radius of UIVisualEffectsView without usage any of private APIs: https://github.com/ML-Works/Bluuur
It uses paused animation of setting effect to achieve changing radius of blur. Solution based on this gist: https://gist.github.com/n00neimp0rtant/27829d87118d984232a4
And the main idea is:
// Freeze animation
blurView.layer.speed = 0;
blurView.effect = nil;
[UIView animateWithDuration:1.0 animations:^{
blurView.effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
}];
// Set animation progress from 0 to 1
blurView.layer.timeOffset = 0.5;
UPDATE:
Apple introduced UIViewPropertyAnimator class in iOS 10. Thats what we need exactly to animate .effect property of UIVisualEffectsView. Hope community will be able to back-port this functionality to previous iOS version.
This is totally doable. Use CIFilter in CoreImage module to customize blur radius. In fact, you can even achieve a blur effect with continuous varying (aka gradient) blur radius (https://stackoverflow.com/a/51603339/3808183)
import CoreImage
let ciContext = CIContext(options: nil)
guard let inputImage = CIImage(image: yourUIImage),
let mask = CIFilter(name: "CIGaussianBlur") else { return }
mask.setValue(inputImage, forKey: kCIInputImageKey)
mask.setValue(10, forKey: kCIInputRadiusKey) // Set your blur radius here
guard let output = mask.outputImage,
let cgImage = ciContext.createCGImage(output, from: inputImage.extent) else { return }
outUIImage = UIImage(cgImage: cgImage)
I'm afraid there's no such api currently. According to Apple's way of doing things, new functionality was always brought with restricts, and capabilities will bring out gradually. Maybe that will be possible on iOS 9 or maybe 10...
I have ultimate solution for this question:
fileprivate final class UIVisualEffectViewInterface {
func setIntensity(effectView: UIVisualEffectView, intensity: CGFloat){
let effect = effectView.effect
effectView.effect = nil
animator = UIViewPropertyAnimator(duration: 1, curve: .linear) { [weak effectView] in effectView?.effect = effect }
animator.fractionComplete = intensity
}
private var animator: UIViewPropertyAnimator! }
extension UIVisualEffectView{
private var key: UnsafeRawPointer? { UnsafeRawPointer(bitPattern: 16) }
private var interface: UIVisualEffectViewInterface{
if let key = key, let visualEffectViewInterface = objc_getAssociatedObject(self, key) as? UIVisualEffectViewInterface{
return visualEffectViewInterface
}
let visualEffectViewInterface = UIVisualEffectViewInterface()
if let key = key{
objc_setAssociatedObject(self, key, visualEffectViewInterface, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN)
}
return visualEffectViewInterface
}
func intensity(_ value: CGFloat){
interface.setIntensity(effectView: self, intensity: value)
}}
This idea hits me after tried the above solutions, a little hacky but I got it working. Since we cannot modify the default radius which is set as "50", we can just enlarge it and scale it back down.
previewView.snp.makeConstraints { (make) in
make.centerX.centerY.equalTo(self.view)
make.width.height.equalTo(self.view).multipliedBy(4)
}
previewBlur.snp.makeConstraints { (make) in
make.edges.equalTo(previewView)
}
And then,
previewView.transform = CGAffineTransform(scaleX: 0.25, y: 0.25)
previewBlur.transform = CGAffineTransform(scaleX: 0.25, y: 0.25)
I got a 12.5 blur radius. Hope this will help :-)
Currently I didn't find any solution.
By the way you can add a little hack in order to let blur mask less "blurry", in this way:
let blurView = .. // here create blur view as usually
if let blurSubviews = self.blurView?.subviews {
for subview in blurSubviews {
if let filterView = NSClassFromString("_UIVisualEffectFilterView") {
if subview.isKindOfClass(filterView) {
subview.hidden = true
}
}
}
}
for iOS 11.*
in viewDidLoad()
let blurEffect = UIBlurEffect(style: .dark)
let blurEffectView = UIVisualEffectView()
view.addSubview(blurEffectView)
//always fill the view
blurEffectView.frame = self.view.bounds
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
UIView.animate(withDuration: 1) {
blurEffectView.effect = blurEffect
}
blurEffectView.pauseAnimation(delay: 0.5)
There is an undocumented way to do this. Not necessarily recommended, as it may get your app rejected by Apple. But it does work.
if let blurEffectType = NSClassFromString("_UICustomBlurEffect") as? UIBlurEffect.Type {
let blurEffectInstance = blurEffectType.init()
// set any value you want here. 40 is quite blurred
blurEffectInstance.setValue(40, forKey: "blurRadius")
let effectView: UIVisualEffectView = UIVisualEffectView(effect: blurEffectInstance)
// Now you have your blurred visual effect view
}
This works for me.
I put UIVisualEffectView in an UIView before add to my view.
I make this function to use easier. You can use this function to make blur any area in your view.
func addBlurArea(area: CGRect) {
let effect = UIBlurEffect(style: UIBlurEffectStyle.Dark)
let blurView = UIVisualEffectView(effect: effect)
blurView.frame = CGRect(x: 0, y: 0, width: area.width, height: area.height)
let container = UIView(frame: area)
container.alpha = 0.8
container.addSubview(blurView)
self.view.insertSubview(container, atIndex: 1)
}
For example, you can make blur all of your view by calling:
addBlurArea(self.view.frame)
You can change Dark to your desired blur style and 0.8 to your desired alpha value
If you want to accomplish the same behaviour as iOS spotlight search you just need to change the alpha value of the UIVisualEffectView (tested on iOS9 simulator)