遇到的一个Presenting view controllers on detached view controllers is discouraged问题

本文探讨了在iOS开发中使用嵌套UIViewController可能导致的应用卡顿问题,提供了深入的理解与解决策略。

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在维护公司代码的时候遇到这样一个问题,Presenting view controllers on detached view controllers is discouraged。按照字面意思是,在一个controller里写了另一个controler。

这样有时候会造成APP卡顿,得空在网上搜了下资料,发现这是一个严重的问题。所以搜集了一些资料,留到以后技术足够了研究看。

https://onevcat.com/2012/02/uiviewcontroller/

### ActivityView in iOS Development In iOS development, `UIActivityViewController` serves as a standard interface for presenting activity options to users. This component allows developers to integrate sharing functionalities within applications easily. The class provides built-in support for common activities such as posting content on social media platforms or sending emails. When implementing transitions between views involving an `UIActivityViewController`, one can utilize segues defined within storyboards. Whenever a user triggers a segue from the current scene, the storyboard runtime invokes the `prepare(for:sender:)` method of the present view controller[^1]. Within this overridden function, necessary information may be passed along with the transition process to prepare the upcoming screen adequately. For scenarios where direct instantiation without using segues is preferred, obtaining instances through storyboard identifiers becomes relevant. To achieve this goal, three main steps are involved: 1. Acquire the UIStoryboard object by specifying its name. 2. Retrieve the desired UIViewController subclass instance via its unique identifier (`myView`) set inside the storyboard file. 3. Present the newly created viewController modally over the existing context. ```swift // Swift code example demonstrating how to instantiate and display another ViewController programmatically if let destinationViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "myView") as? MyViewController { self.present(destinationViewController, animated: true, completion: nil) } ``` Regarding deployment targets, it's important to note differences when working across devices versus simulators. Applications packaged into `.ipa` files cater specifically towards real-world usage on physical hardware while those compiled under simulator settings produce `.app` bundles suitable only for testing purposes during development phases[^3].
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