How to gray out UITableView? - ios

I’m working my way through Beginning iPhone Development with Swift. I want to make UITableView 'gray out' while editing in UISearchBar is being active. For instance check out 'f b messenger' iOS application. There are many things we can do for this like., changing alpha value or changing background color to gray, I'm looking for a robust way. Any comments and suggestions are appreciated. Thanks.

Maybe you need:
searchController.dimsBackgroundDuringPresentation = false;

Related

List with system background color gets messed up in dark mode

I am trying to set a background color for a List that will adapt to the iOS mode (light/dark).
I use .systemGray5 without problems in VStacks but when using it in Lists and I change to dark mode I get a very dark, almost black color which makes everything unintelligible.
This happens regardless if the list is dynamic or static. Is this a bug? Or is there an alternative way to do it?
List {
Text("Privacy").foregroundColor(Color(.systemRed))
}.colorMultiply(Color(.systemGray5))
The problem is that colorMultiply will multiply all colors in the list (text, background, separator) with the given color (see multiply color blending). This will darken the whole view, which probably looks okayish in light mode, but is the opposite of what you want to do in dark mode.
There are two ways to change the background colors in a List:
List {
Text("Privacy").foregroundColor(Color(.systemRed))
.listRowBackground(Color(.systemGray5))
}
.background(Color(.systemGray5))
background will change the background of the whole List, but I guess this is only really visible in grouped lists, since the cells usually don't have any space between them.
listRowBackground changes the background color of a view when it's used in a List environment. That's probably what you want to use here.
Frank Schlegel provided an answer which works only for static lists. Until Apple fixes this for dynamic lists I solved my problem by using this code
List {
ForEach(pumpData) { pump in
Text("pump").listRowBackground(Color(.systemGray5))
}
}.background(Color(.systemGray5))
.secondarySystemGroupedBackground worked for me.

Is it possible to change color of bottom horizontal line of iPhone X series within app?

is it possible to change color of bottom horizontal line of iPhone X series within app(inside app only)? my client is asking to change color of this line, and i am not able to find any related topic or solution.
Thanks.
No, I don't think it is. That's drawn by the system, and is not part of your app. Apple does not let apps change things outside of that app's "sandbox".
Edit:
I found a long article on the subject online:
https://medium.freecodecamp.org/reverse-engineering-the-iphone-x-home-indicator-color-a4c112f84d34
It seems it's called the "home indicator" and this author supports my suspicion that you can't change its color.
Edit #2
As Matt points out, the color of the home indicator changes automatically. The system has logic in it that tries to keep enough contrast between the home indicator and the area around it so that it's clearly visible. See the article I linked for more on that subject than you probably wanted to know.
You can only remove it:
override var prefersHomeIndicatorAutoHidden: Bool {
return true
}
The color is applied automatically.

Change iOS System Keyboard Background Image and Buttons Image

Rather than creating a custom keyboard...how can I change the ios keyboard background image and get reference of the keyboard button or just the keyboard view programatically?
I do not want to replicate the whole ios keyboard, just tweak the keyboard here and there.
Solution Update:
You cannot update only the background or the buttons of the iOS System Keyboard! This is dues to the reason that Apple has limited the access to the Keyboard API. The most you can do is change the keyboard background color i.e. dark or light.
If you need to change the background to an image like me, you need to extend the ios keyboard i.e. make your own custom keyboard!
Please check below for accepted answer!
Hope this helps!
You can do something like this,
myTextField.keyboardType = UIKeyboardTypeDecimalPad; // many other options
myTextField.keyboardAppearance = UIKeyboardAppearanceDark; //many other options
If you want totally customize keyboard then refer this tutorial.
Hope this will help :)
For dark background you can use
mytextfield.keyboardAppearance = UIKeyboardAppearanceAlert;
For more customisation follow this link:
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UITextInputTraits_Protocol/index.html

How to create Semi-transparent buttons

If anyone could show me how to make a button similar to the one in the image below I would be really grateful!! I intend to use the button in XCode for Iphone/ IPad
I have no experience of this, but did you tried to make a e.g. 50% transparent (.GIF / .BMP) picture and set it as a background of the button?
OK so I solved this now, I set the alpha of my image to 0.7 with the following code
shootButton.alpha = 0.7;
And I also used photoshop's "Satin" effect to give it a more translucent effect.

invert UIDatePicker colors in iOS 7

I want to start by saying that i would post this question on the Apple Dev Forums but because of the hacking attempt fiasco , or whatever that was, the forum has been offline for almost 2 weeks now and i need a solution for this as soon as possible.
In iOS 7 the UIDatePicker looks like this :
and a client asked to look like this :
(basically inverted).
I've tried a few things:
Setting the background to black and looping through all the view's subviews until i reach the labels that show the date itself and change their color to white. The problem is that The view has only one subview, and that subview doesn't have any subviews of it's own. So this solution doesn't work. (it did in ios6).
Applying a filter to the view's CALayer. The thing is that this is only possible on OS X not on iOS, for some unknown reason.
Playing with UIApperance protocol. From what i've read this should work but what i've tried didn't and i don't have extensive experience with this to figure out why not.
Any ideas what i can try? Is this even possible? Did i made a mistake in my approach of the problem?
Try this out :
Put this code in -(void)viewDidLoad
[datePicker setValue:[UIColor whiteColor] forKey:#"textColor"];
Swift:
datePicker.setValue(UIColor.white, forKey: "textColor")
Don't know if this is still relevant but on Swift 3 / Xcode 8 you can simply do this:
let datePicker = UIDatePicker()
datePicker.datePickerMode = UIDatePickerMode.date
// Sets the text color
datePicker.setValue(UIColor.white, forKey: "textColor")
// Sets the bg color
datePicker.backgroundColor = UIColor.black.withAlphaComponent(0.6)
textField.inputView = datePicker
I spent quite a bit of time struggling with the same problem. At first, I've put a UIDatePicker on a black background and was wondering why it is invisible...
I ended up placing a white UIView as a background for the date picker, so while the whole view is black, the date picker is white. It actually looks okay, although thankfully I don't have a client who would dictate the design.
One possible argument for a client: the old, pre-iOS7 date picker, also had a predefined non-customisable background.
What you want is possible, but it will be called Custom Date Picker.
Below is the link where you will find what you wanted.
https://www.cocoacontrols.com/controls/simpledatepicker
If you need more, take a loot at below link.
https://www.cocoacontrols.com/search?utf8=%E2%9C%93&q=datepicker
Well I understand your frustration, but iOS7 is under NDA. Usually this kind of views are made using layers, beacuse of sublayerTransform that can make perspective giving the idea of 3D. I would check sublayers if you don't see subviews.
The other poin is that I would not hack too much views/layers hierachy, ios<=6 to ios7 transition shown that hacking isn't a good idea.
UIAppereance protocol is probably the way to go, becauase it makes you change what you can change (without screwing that in the future), maybe you can set a backgroundImage, try to set a 1x1pixel of a blck color png, you should also see an attributed string property, or text property.
I dont think its possible to do that directly by changing the properties of the default UIDatePicker , although you can use custom controls to do it.
This might help,
MWDatePicker - https://github.com/mwermuth/MWDatePicker (Found it in cocoa controls -https://www.cocoacontrols.com/controls/mwdatepicker)
according to the iOS Design Resources:
You cannot customize the appearance of date pickers.
I would suggest one of the below:
Redesign your UI to use the black text
Use a customer datepicker
You should tell your client that his suggestion is against the design principles of iOS 7, which indeed it is. I am not a great fan of iOS 7 myself, but we should all give it a go. Your client should accept the standard iOS 7 UI provisionally, until he is in a position to make an informed judgement. Designing an app based on his initial impressions is a recipe for disaster.

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