protocols

问题 As far as I understand, ICE protocol is used for discovering the nodes/devices from the end-user device to "the outside". I don't understand why it's needed. Isn't packet-routing is the responsibility of network devices like routers and switches? They should find the shortest path from the gateway to the end-user device (Actually, routers remembers those routes they previously discovered). Moreover, NAT protocol is used to convert from an "internal ip" to "external ip" and vice-versa. So

问题 I made a custom class that handles audio recording/playback and put a Protocol in that class. I implemented the Protocol in a UIViewController class and called my setDelegate method for my AudioHelper class. I am getting a compile error that has to do with my init() . Not exactly sure how to get rid of the error: use of 'self' in method call 'setupAudioSession' before super.init initializes self override init() { setupAudioSession() super.init() } How do I resolve this error? And why do I

来源： https://stackoverflow.com/questions/54668000/type-hint-for-an-instance-of-a-non-specific-dataclass

来源： https://stackoverflow.com/questions/27554034/why-use-class-only-protocols-in-swift

来源： https://stackoverflow.com/questions/33578694/defining-a-swift-protocol-for-arbitrary-int-based-enums

问题 I defined enums as confirming to a protocol Eventable: protocol Eventable { var name: String { get } static var all: [Eventable] { get } } enum MyEnum: String, Eventable { case bla = "bla" case blu = "blu" var name: String { return self.rawValue } static var all: [Eventable] { return [ MyEnum.bla, MyEnum.blu ] } } I have other enums like MyEnum also under the form: enum Bla: String, Eventable { } I have two questions: for the enums having a String data type, I would like to avoid duplicating

问题 How well does REST work on other protocols besides HTTP? Are there any good examples for protocols who use REST or might use REST? 回答1: I don't think you are going to find many, but here is one for embedded systems. 来源： https://stackoverflow.com/questions/4510880/examples-of-rest-over-non-http-protocols

问题 I am trying to delete a single element of the coreData set using a button inside a collectionviewcell. So the cell has a label with the result of the core data fetch. When I hit the button it should delete the cell making it no longer appear. Also the the core data single set item should be perementley deleted. I have scence this used before in protocols but not using core data.The core data is var itemName. class CustomCell: UICollectionViewCell { @objc func delete() { }} class

问题 I am trying to delete a single element of the coreData set using a button inside a collectionviewcell. So the cell has a label with the result of the core data fetch. When I hit the button it should delete the cell making it no longer appear. Also the the core data single set item should be perementley deleted. I have scence this used before in protocols but not using core data.The core data is var itemName. class CustomCell: UICollectionViewCell { @objc func delete() { }} class

问题 I am trying to delete a single element of the coreData set using a button inside a collectionviewcell. So the cell has a label with the result of the core data fetch. When I hit the button it should delete the cell making it no longer appear. Also the the core data single set item should be perementley deleted. I have scence this used before in protocols but not using core data.The core data is var itemName. class CustomCell: UICollectionViewCell { @objc func delete() { }} class