Why I can't use let in protocol in Swift?

Why I can't use let in protocol in Swift?

ios swift protocols getter-setter swift-protocols

ios

Swift Equatable on a protocol

ios swift protocols equatable

ios

Difference between protocol and delegates?

ios objective-c delegates protocols

ios

swift protocol 'weak' cannot be applied to non-class type

swift protocols

ios

Android / iOS - Custom URI / Protocol Handling

android ios protocols manifest custom-url-protocol

ios

Using JSONEncoder to encode a variable with Codable as type

ios swift serialization protocols codable

ios

KVO vs NSNotification vs protocol/delegates?

iphone ios protocols key-value-observing nsnotifications

ios

Auto-implement Swift protocol methods in Xcode

ios xcode swift autocomplete protocols

ios

Swift Protocol get only settable?

ios swift protocols getter-setter

ios

Swift Declare Class Func in Protocol

ios swift protocols static-methods class-method

ios

Cannot find protocol declaration for

iphone objective-c ios delegates protocols

ios

Swift 3 protocol extension using selector error

ios objective-c swift swift3 protocols

ios

Conform to protocol in ViewController, in Swift

ios protocols swift

ios

Protocol Extension, Mutating Function

ios iphone swift protocols ios9

ios

Swift: use of 'self' in method call before super.init initializes self compile error

ios delegates protocols

ios