delegates

来源： https://stackoverflow.com/questions/45798261/calling-delegate-method-through-different-classes-in-swift

来源： https://stackoverflow.com/questions/45798261/calling-delegate-method-through-different-classes-in-swift

来源： https://stackoverflow.com/questions/7609629/expose-actiont-as-actionobject

来源： https://stackoverflow.com/questions/7609629/expose-actiont-as-actionobject

来源： https://stackoverflow.com/questions/8285880/is-funcin-t-out-tresult-appropriate-to-use-as-a-ctor-arg-when-applying-depend

来源： https://stackoverflow.com/questions/8285880/is-funcin-t-out-tresult-appropriate-to-use-as-a-ctor-arg-when-applying-depend

来源： https://stackoverflow.com/questions/8285880/is-funcin-t-out-tresult-appropriate-to-use-as-a-ctor-arg-when-applying-depend

问题 I want to capture a picture from the camera with no preview. Though I am able to do that with a UIViewController with the help of AVFoundation framework. But now I have to do the same without the ViewController. #Issue When I trying to do the same with a NSObject class the AVCapturePhotoCaptureDelegate is not called. TestingCamera.h #import <AVFoundation/AVFoundation.h> NS_ASSUME_NONNULL_BEGIN @interface TestingCamera : NSObject <AVCapturePhotoCaptureDelegate> { AVCaptureSession

问题 Does the ?. operator that can be used to invoke a delegate or event avoid race conditions? Eg. avoid race-condition manually: //The event-invoking method that derived classes can override. protected virtual void OnShapeChanged(ShapeEventArgs e) { // Make a temporary copy of the event to avoid possibility of // a race condition if the last subscriber unsubscribes // immediately after the null check and before the event is raised. EventHandler<ShapeEventArgs> handler = ShapeChanged; if (handler

问题 I want to know what is fastest way to get value (only for this problem) from an object`s property ? after some searching I saw a post from @MarkGravell in this site He wrote this code : using System; using System.Reflection; using System.Reflection.Emit; public class Foo { public Foo(int bar) { Bar = bar; } private int Bar { get; set; } } static class Program { static void Main() { var method = new DynamicMethod("cheat", typeof(int), new[] { typeof(object) }, typeof(Foo), true); var il =