I created a UIPickerView that I would like to not have that fade on the edges.
First I thought that must be some kind of gradient overlay so I recursively hid all UIImageViews within the UIPickerView and also set all layer.contents to nil. Setting a background color different to white to the picker view reveals that the fade cannot be an overlay, since the labels in the picker view now fade to the background color.
Does anybody have an idea on how to find that layer mask and turn it off?
EDIT
I just checked if there are any CALayers with masks, but there are none.
This is not exactly the answer to my question but at least a solution. I found a custom (horizontal) AKPickerView on GitHub which is available for Obj-C and Swift (1.2 and 2.0). This View has an undocumented property maskDisabled which does exactly what I need.
Related
I need to have a circular UIButton that draws a custom color in the middle, along with an outer ring that is drawn as the default tint color (similar to a UIColorWell).
I've tried a few different approaches:
Using a multicolor SFSymbol: This would be an elegant solution, but as far as I can tell there's no way to apply the tint color to just a part of the image while setting the center to be a custom color. Either the entire image is tinted, or the image is drawn as the default colors set in the symbol file. Also, I need to support iOS 14, while the new hierarchical options that may allow me to accomplish this were added to iOS 15.
Setting various layer properties (ie, cornerRadius, borderColor, etc): This works and may be a decent fallback solution, but I'm unable to get the look that I'm going for (namely, having a transparent ring between the outer border and inner colored circle).
If there's a way to use either of the above options, please educate me! Either one seems like a better solution than:
Overloading the draw function: This is the option I'm going with at the moment, as it allows me to have complete creative control over the look of the button. The rest of this post will be regarding this method.
So far I was able to get the button to be drawn exactly as I wanted. However, I am unable to figure out how to draw the button appropriately with regards to various state changes.
For example, if a popover is displayed, all of the normal buttons are automatically redrawn as disabled. My custom button, however, isn't redrawn so I am unable to respond to the state change.
Same thing with tapping on the button - normal buttons are briefly shown in an emphasized color but my custom button doesn't respond.
Does someone have an example as to how to support overriding UIButton drawing with various states?
I was able to get the desired behavior by overriding tintColorDidChange in order to trigger a redraw of the button. Now I am able to draw the outer ring in the correct color (including grayed out when a popover is displayed) while maintaining the desired inner color.
In the iOS music app, I've noticed the shadow underneath album artwork changes based on the color of the artwork. This shadow can also be multi-colored based on how the color at the edge of the artwork changes.
Does anyone know how to recreate this effect programmatically?
Thanks to #Josh Homann for pointing me in the right direction, but the answer was actually much more complex.
The first (bottom) UIView in the hierarchy should have a plain white background and be pinned to the edges of the screen.
The next view should be a UIImageView with an alpha of 0.75.
Then you should add a UIVisualEffectView with the same dimensions as the first view.
Finally, add another UIImageView that is the same size as the first UIImageView.
Your IB hierarchy should look similar to this:
The final result is this:
Its not a shadow its a UIVisualEffectView with a blur. Add a second image view under your image view with a larger size and add a blurring visualEffectView to it.
Sorry to revive an old question, but this library nailed it: ShadowImageView.
It uses CIFilter which gives you more control over the blur effect and better results.
I want to change the color of the arrow that UIPopoverPresentationController uses to point at its source. The only way I can see to do this is to subclass UIPopoverBackgroundView and write drawRect and draw the popover border and arrow myself. That's a pain, because there are little niceties in the default popover like rounded corners on everything. And I want to make it feel as much at home on the platform as I can.
Do I really have to draw my own popover arrow just to change the color of the arrow?
Update: I've tried setting the backgroundColor of the UIPopoverPresentationController, but it appears to change the color of everywhere the arrow might draw. I've seen it work before, but I can't nail down what makes it work when it does. See screenshot of setting the color to red. The blue is the content of the navigation controller in the popover. It's supposed to be pointing at the button.
The UIPopoverPresentationController's backgroundColor property should handle that for you
Update
I've used this approach a number of times and have never seen what you have in your screenshot. Are you sure you are using popoverPresentationController.backgroundColor and not setting a different background color on a view or container? Below is screenshot of non-centered popover arrow. The view controller background is green, the popoverPresentationController.backgroundColor is red. Shown next to the code setting the value.
Update #2
I looked at the project you posted and found the problem (although I'm not entirely sure why it's the problem). You are setting the popover presentation controller's backgroundColor property inside your presented view controller under viewWillAppear:. I suspect that setting the background color like this after the presentation happened is what triggers the bug pre-iOS 10.
If you set the popover presentation controller's backgroundColor inside your presenting view controller's onPopover: method, where you are also setting the sourceView and sourceRect properties (and before you actually call presentViewController:), everything works correctly.
I am working on my first Today Centre widget, which simply consists of three labels on the default storyboard. It's working fine, but I read in the iOS Human Interface Guidelines that secondary text should "use the system-provided vibrant appearance" with notificationCenterVibrancyEffect.
What's the correct way to add this vibrancy effect to my two secondary labels? I've read about UIVisualEffectView, but it's still not clear to me how to use it for this purpose. I don't think I want to put a blurred view behind my labels because Notification Centre already blurs the background.
UIVisualEffectView when configured with a UIVibrancyEffect is meant to be used as a container—just drop your labels in its contentView and you’ll get the appropriate appearance on top of the Notification Center blur. The text color doesn’t matter; when it’s added to the contentView it gets special treatment and effectively always renders with the same appearance, though you can still adjust the alpha of the view (not of the text color) to make it more or less prominent.
good day, first of all u should use a correct view hierarchy, when U add some objects in your VisualEffectView example:
UIVibrancyEffect used in combination with UIVisualEffectView, adjusts the colors of the content to make it feel more transparent. UIVibrancyEffect can blending some objects
with the background example:
More particularly to your question(https://stackoverflow.com/a/25392645/4912496) Apple recommends to use vibrant effect for secondary text, because its simply beautiful for example(apple native app use vibrant effect, and Sports.ru don't use it):
But, some apps don't use this effect...
To ensure that your widget gets the vibrancy effect that’s appropriate for displaying items in the Today view, use notificationCenterVibrancyEffect.
Some info. https://www.omnigroup.com/developer/how-to-make-text-in-a-uivisualeffectview-readable-on-any-background
I'm wondering what would be the best way to desaturate a UIView—particularly, a UISliderView with custom appearance applied to it. In iOS 7, the standard controls fade out their tint colors when another view appears over them (for example, a share sheet or UIAlertView), but since mine is built from UIImages, the tint property doesn't apply to it, and they remain saturated.
Is there a good, easy way to desaturate this, short of re-applying a new UIAppearance for it? (If I were to go that route, would I even be able to animate the transition from colored images to greyscale ones?)
Thanks in advance!