I show the alertController, by clicking a button in a view, but it is obscured by the view. How can I make the alert prompt box appear at the front? -sharp-sharp-sharp problem description
/ / Please paste the code text below (do not replace the code with pictures)
two reasons cannot be displayed:
the first reason, you can run it, click the UI debug button, you can see the sequential position of each view, and you will know if view is blocking the front. If it is blocked, the way you add view will have to be changed.
for the second reason, here is a reference for the use of alertController.
let alertController = UIAlertController(title: title, message: alertMessage, preferredStyle: .alert)
let cancelAction = UIAlertAction(title: cancleTitle, style: .cancel, handler: nil)
alertController.addAction(cancelAction)
presenter?.present(alertController, animated: true, completion: nil)Previous: Javascript adds a new value to an attribute and cannot empty the original value of this property.
this is the oc library I depend on in podspec after I pod install in the swift project, I did not write the .h file of these libraries in the umbrella file. How do I configure it ...
the size parameter of the UIGraphicsBeginImageContextWithOptions function is too large, resulting in a memory explosion I use size data, which is about 3 times the height and width of the screen size, that is (3 UIScreen.main.bounds.height,3 UIScree...
I know that the OAuth2.0 protocol receives code, from the client and uses code in exchange for token and openID in the background, but I don t quite understand. When you see QQ logging into these third-party api, you can directly obtain token and openI...
problem description [AVAssetWriterInput markAsFinished] Cannot call method when status is 0. the environmental background of the problems and what methods you have tried po status = 1; related codes Please paste the code text below (do not r...
create two viewcontroller, the first is to make a list of table view provinces in China, and the other detail view is to display the specific content corresponding to the relevant information of each province when you click on table view s cell. The ...
there is only one button at the bottom of the STORYBOARD, which is done in viewcontroller. I want to create another class now. There is a view, view in the class and there are multiple label. in it. I want to implement: in the run, if you click this but...
problem description when you do IM live chat, when you receive a message, you will display a small red corner sign on the icon of App, and there are several unread messages. Then the chat list shows the number of unread messages for a specific person,...
SWIFT is not recommended to operate with reflection, but how do I deal with a list of string? when I click on a cell in the list, I get the corresponding class through this string and add the UIVIEW of the corresponding class? ...
problem description because our company s App wants to be an overseas market, it starts with internationalizing the language, setting the English or Chinese mode according to the user s choice. However, overseas and domestic requirements are differe...
problem description after textView append an attributeString with the code, continue to edit the keyboard, the style cannot be restored related codes The code for button is as follows: let attributeText = NSMutableAttributedString(attributedSt...
problem description App uses TabbarController- > NavigationController- > ViewController architecture. You want the overall interface to default to vertical screen, and then some specific interfaces can support horizontal and vertical screen switching ...
I use storyboard to develop, but I want to use swift code to control some attributes such as button and label. What should I do, Daniel? ...
problem description I have two ViewController, one ViewA to search and display the Bluetooth list, and one ViewB to control the operation of Bluetooth devices. Now I inherit CBCentralManagerDelegate , CBPeripheralDelegate on ViewA and search for th...