swift-extensions | 易学教程

Return instancetype in Swift

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问题 I\'m trying to make this extension: extension UIViewController { class func initialize(storyboardName: String, storyboardId: String) -> Self { let storyboad = UIStoryboard(name: storyboardName, bundle: nil) let controller = storyboad.instantiateViewControllerWithIdentifier(storyboardId) as! Self return controller } } But I get compile error: error: cannot convert return expression of type \'UIViewController\' to return type \'Self\' Is it possible? Also I want to make it as init

Overriding methods in Swift extensions

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问题 I tend to only put the necessities (stored properties, initializers) into my class definitions and move everything else into their own extension , kind of like an extension per logical block that I would group with // MARK: as well. For a UIView subclass for example, I would end up with an extension for layout-related stuff, one for subscribing and handling events and so forth. In these extensions, I inevitably have to override some UIKit methods, e.g. layoutSubviews . I never noticed any

Overriding methods in Swift extensions

阅读更多关于 Overriding methods in Swift extensions

I tend to only put the necessities (stored properties, initializers) into my class definitions and move everything else into their own extension , kind of like an extension per logical block that I would group with // MARK: as well. For a UIView subclass for example, I would end up with an extension for layout-related stuff, one for subscribing and handling events and so forth. In these extensions, I inevitably have to override some UIKit methods, e.g. layoutSubviews . I never noticed any issues with this approach -- until today. Take this class hierarchy for example: public class C: NSObject