I'm writing an app in Swift, targeting iOS 8. Does anyone know whether it's possible to programmatically position the alerts that are displayed via UIAlertController? The documention makes no mention of position or location, so I tried setting the controller's view.frame property to a new CGRect, but alerts still appearing dead center.
The alert view, by design, shows right in the center. This is because the experience is intended to be familiar and simple for the end user. In the documentation for UIAlertController it also notes:
The view hierarchy for this class is private and must not be modified.
If you wish to manipulate the placing of the frame, you've got several options that use a plain old UIView/UIViewController. Here is one I've used where you can do what you want that's written in swift: https://github.com/vikmeup/SCLAlertView-Swift
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I have been asked this question many times in the interview searched every where didn't get any proper answer.So finally posting this question here.
You may go through this.
Yes, you can have multiple windows. A key window is the one who receives the user input.
Starting with Rob's answer I played around a bit and would like to write down some notes for others trying to get information on this topic:
It is not a problem at all to add another UIWindow. Just create one
and makeKeyAndVisible. Done.
Remove it by making another window
visible, then release the one you don't need anymore.
The window that is "key" receives all the keyboard input.
UIWindow covers everything, even modals, popovers, etc. Brilliant!
UIWindow is always in portrait implicitly. It does not rotate.
You'll have to add a controller to the new window's root controller and let that handle rotation.
(Just like the main window) The window's level determines
how "high" it gets displayed. Set it to UIWindowLevelStatusBar to have it cover everything.
Set its hidden property to NO. A 2nd
UIWindow can be used to bring views on the screen that float on top of everything. Without creating a dummy controller just to embed that in a UIPopoverController.
It can be especially useful for iPhone where there is no popover controller but where you might want to mimic something like it.
And yes, it solved, of course, my problem: if
the app resigns activation, add a cover window over whatever is
currently shown to prevent iOS from taking a screenshot of your
app's current content.
Generally one application require only 1 UIWindow, but still there may be some scenarios where you need to use multiple UIWindow in one application.
For example, you wish to show a view on the top of system AlertViews, or can the default Keyboard.
UIWindows are the special UIViews, for which their display order is controlled by .windowLevel property.
You don't need to add a new UIWindow as a subview of any of view. You can simply create a new UIWindow and call either window setHidden:NO or window makeKeyAndVisible depend on the level, you have given to it.
There are three default window enum levels defined:
UIWindowLevelNormal
UIWindowLevelStatusBar
UIWindowLevelAlert
Of course it can have multiple windows. Just, only one to be displayed at a time, that's the keyWindow. You can have multiple windows stored in array or whatsoever, and make them keyWindow when you want to display them.
And, yeah, read the documentation #Mannopson suggested, it's very useful.
I am struggling the last couple of days to figure out if these alerts are part of UIKit or just a private custom view. I don't even know how they properly called. The UI team have asked for an alert that looks like the one appears in Apple's News and Podcast apps. See screenshots below.
Apple's code to perform this is not part of UIKit. It will need to be implemented by you! I made a framework to do just this on GitHub called AOModalStatusView (https://github.com/alecdoconnor/AOModalStatusView).
The easiest way to do this would be with a custom view presented modally and with the presentation style set to "over current context" so that what is behind the view shows through. Inside the view create a square that is centered on the view. Give it rounded corners and a specific width and height. In order to get the blurred background you should use Apple's "Visual Effects View with Blur" or "Visual Effects View with Blur and Vibrancy." (https://shrikar.com/ios-development-tutorial-visual-blur-with-uivisualeffectview/)
In the view controller for this view, set a timer shortly in viewDidAppear(..) that will run dismiss(animated: true, completion: nil)
You can use my own StatusAlert framework written in Swift. It gives you ability to show Apple system-like alert as well as present the same alert without an image, title or message anywhere in UIView.
It is available via Cocoapods and Carthage and supports iPhone X, Safe Areas layout, iPads and allows some customizations.
I wonder which component is being used to create a selector option like the one used in iBooks where we can adjust the Font Size and also the Theme, but without moving to a new view controller.
In my application I would like to implement it giving 3 small options to the user to choose, but without moving the view controller being presented. Its a small square area with an arrow at the bottom or top side giving the impression where it's coming from. (Let me know if I am not clear with the explanation).
Does anybody know how to use it??
Thank you all in advance
ibooks is using UIView. In that UIView you can add any controls you like. You need to use delegate methods so that I can perform communication between two objects(send message to another object). You will be able to make you custom UIView as controls.
I want to get the keyboard size without using NSNotification. When I press the plus button, it can replace the keyboard with a custom UIView like this:
Then the plus button is pressed and the view loaded:
How can I achieve this?
I already made same rookie mistake like you want to do here. The problem is you will write a lot only to realize you do not want to avoid standard flow provided you by iOS team. For example you will definitely have a bad time dealing with issue like this one (there is additional bar which is part of standard keyboard for Chinese locale):
I solved this by using other people's work from DAKeyboardControl project. You do not need to attach observer (or if you use DAKeyboardControl - block) directly to your bar with buttons, but to your controller and check what user is trying to do and animate this bar accordingly. In the sources you can see how to get keyboard's animation duration and timing function. It may sound more complicated than it indeed is, just give it a try.
I'm currently working on an iOS app that is pretty much supposed look and work like an already existing android app.
As a part of that, I'd like to make the top navigation look the same, but since iOs devices do not provide a hardware or software integrated back button, I'd also like to keep the back button navigation that's common to iOs apps.
I've tried numerous attempts to achieve it, but I'll stick with the latest I'm working on since it looks the most promising. I've started to work on a custom UINavigationBar class that overrides the initWithCoder: and layoutSubviews: methods. The result is as follows:
As you can see, the back button now overlaps the application icon. What I'm looking for is a way to make the button and the text to scale into the space right of the application icon. I've tried to handle this in layoutSubviews: but the superclass logic appears to be rather complex, I was not able to reproduce it's functionality (in particular it seems to be working with some private variables I don't have access to).
I also tried manipulating self.frame before calling [super layoutSubviews] but apart from endless loops I was not able to achieve anything in that direction.
I'd be happy if anyone could point me into the right direction.
If I understand your problem correctly, I think you could do this by adding a custom titleView to the UINavigationItem, and have an image view (on the left side for the icon) and a label (for the title) as subviews. This would replace the default title.