protocols

问题 So my client is requesting a GapFill because our sequences are off. Instead of replaying the messages I want to send a SequenceReset instead. My question is simple: What should be the message sequence of this SequenceReset I am about to send to him? I don't want my client to drop it because it does not recognize the message sequence in my SequenceReset, or detect a gap and ask for another GapFill which would put me on an infinite loop. Should I send my SequenceReset with the sequence of the

问题 I'm implementing a class but I'm getting this error: Use of undeclared type 'myProtocol' Here is my code: class LocalContactService: myProtocol{ Any of you knows why I'm getting this error? 回答1: i had the same error .in my case i found accidentally that i added my swift files into "copy bundle resource" in "build phase" i removed all swift file except assets then everything worked fine. 回答2: Perhaps you've never defined myProtocol . Or if you have, maybe it's out of scope in the

问题 Im trying to build a persistence module and Im thinking in serialize/deserialize the class that I need to make persistence to a file. Is possible with Boost serialization to write multiple objects into the same file? how can I read or loop through entrys in the file? Google protocol buffers could be better for me if a good performance is a condition? 回答1: A Serialization library wouldn't be very useful if it couldn't serialize multiple objects. You can find all the answers if you read their

问题 In Swift, if I create a delegate protocol, it can be conformed to by class and struct. protocol MyDelegate { // Can be conformed to by class or struct } The issue comes up when I declare the delegate. If the delegate is a class instance, I want the variable to be weak to avoid retain cycle. If it is a struct, there is no such need - in fact, Swift won't allow me to make the delegate variable weak. Note: I know how to create a weak delegate, but the key question is - if you create a delegate

问题 I have a .NET client-application which uses a third-party library to access a server via http. The library throws the following error: The server committed a protocol violation. Section=ResponseBody Detail=Response chunk format is invalid The software is already installed dozens of times, so i think it must be an issue in the customers system, my suspicion is the proxy between. I have used Fiddler to get a first hint. While sniffing Fiddler notice a protocol violation: Illegal chunked

问题 I occasionally instantiate a class from my view controller by passing in the view controller instance itself so that the objects that I create can invoke methods of the controller to update the view. Is that always, often, or never a bad practice? Concretely: ViewController.h has -(void)updateButtonValue:(NSString*)value; MyObject.h has -(id)initWithViewController:(ViewController*)aViewController; I instantiate that class from my view controller with: [[MyObject alloc] initWithViewController

问题 Why when I extend the ExpressibleByArrayLiteral protocol in swift I need to make the init required. In the definition of the protocol, the init method is just public. I pretty much have the same thing as in the doc, https://developer.apple.com/reference/swift/expressiblebyarrayliteral, and still, the compiler complains about making this init(arrayLiteral: Element...) required. The only difference I have is that I am implementing it in a class no a struct. Any suggestions? UPDATE: Here is an

问题 I've a base class that implements an extension that conforms to a protocol as below: protocol OptionsDelegate { func handleSortAndFilter(opt: Options) } extension BaseViewController: OptionsDelegate { func handleSortAndFilter(opt: Options) { print("Base class implementation") } } I've a subclass "InspirationsViewController" that inherits from BaseViewController. And I'm overriding protocol method in the extension as below: extension InspirationsViewController { override func

问题 This is a UART transfer between two atmega328p controllers. I am trying to confirm that the data is being properly passed by printing a variable from the data struct on the receiving controller. My terminal is not displaying any information. I can only confirm that the code is being reached from my LED calls, where I enable portB. I am fairly sure my BAUD rate is correct (51 for 8mhz). Also confident the hardware is hooked up properly. Any recommendations on how to debug further to find the

问题 I have subclass file which use method from UITextFieldDelegate protocol class MyTextField: UITextField, UITextFieldDelegate { . . . override func willMoveToSuperview(newSuperview: UIView?) { super.willMoveToSuperview(newSuperview) self.delegate = self } func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool { // some actions return true } } In my ViewController class I use input field with my subclass class ViewController