Swift-init构造函数

 [](https://img.shields.io/badge/Swift-5.1_5.2_5.3_5.4-Orange?style=flat-square) [](https://img.shields.io/badge/Platforms-macOS_iOS_tvOS_watchOS_Linux_Windows-Green?style=flat-square) [](https://img.shields.io/cocoapods/v/Alamofire.svg) [](https://github.com/Carthage/Carthage) [](https://img.shields.io/badge/Swift_Package_Manager-compatible-orange?style=flat-square) [](https://twitter.com/AlamofireSF) [](https://forums.swift.org/c/related-projects/alamofire/37) Alamofire is an HTTP networking library written in Swift. - [Features](#features) - [Component Libraries](#component-libraries) - [Requirements](#requirements) - [Migration Guides](#migration-guides) - [Communication](#communication) - [Installation](#installation) - [Usage](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#using-alamofire) - [**Introduction -**](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#introduction) [Making Requests](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#making-requests), [Response Handling](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#response-handling), [Response Validation](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#response-validation), [Response Caching](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#response-caching) - **HTTP -** [HTTP Methods](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#http-methods), [Parameters and Parameter Encoder](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md##request-parameters-and-parameter-encoders), [HTTP Headers](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#http-headers), [Authentication](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#authentication) - **Large Data -** [Downloading Data to a File](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#downloading-data-to-a-file), [Uploading Data to a Server](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#uploading-data-to-a-server) - **Tools -** [Statistical Metrics](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#statistical-metrics), [cURL Command Output](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Usage.md#curl-command-output) - [Advanced Usage](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md) - **URL Session -** [Session Manager](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#session), [Session Delegate](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#sessiondelegate), [Request](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#request) - **Routing -** [Routing Requests](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#routing-requests), [Adapting and Retrying Requests](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#adapting-and-retrying-requests-with-requestinterceptor) - **Model Objects -** [Custom Response Handlers](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#customizing-response-handlers) - **Connection -** [Security](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#security), [Network Reachability](https://github.com/Alamofire/Alamofire/blob/master/Documentation/AdvancedUsage.md#network-reachability) - [Open Radars](#open-radars) - [FAQ](#faq) - [Credits](#credits) - [Donations](#donations) - [License](#license) ## Features - [x] Chainable Request / Response Methods - [x] Combine Support - [x] URL / JSON Parameter Encoding - [x] Upload File / Data / Stream / MultipartFormData - [x] Download File using Request or Resume Data - [x] Authentication with `URLCredential` - [x] HTTP Response Validation - [x] Upload and Download Progress Closures with Progress - [x] cURL Command Output - [x] Dynamically Adapt and Retry Requests - [x] TLS Certificate and Public Key Pinning - [x] Network Reachability - [x] Comprehensive Unit and Integration Test Coverage - [x] [Complete Documentation](https://alamofire.github.io/Alamofire) ## Component Libraries In order to keep Alamofire focused specifically on core networking implementations, additional component libraries have been created by the [Alamofire Software Foundation](https://github.com/Alamofire/Foundation) to bring additional functionality to the Alamofire ecosystem. - [AlamofireImage](https://github.com/Alamofire/AlamofireImage) - An image library including image response serializers, `UIImage` and `UIImageView` extensions, custom image filters, an auto-purging in-memory cache, and a priority-based image downloading system. - [AlamofireNetworkActivityIndicator](https://github.com/Alamofire/AlamofireNetworkActivityIndicator) - Controls the visibility of the network activity indicator on iOS using Alamofire. It contains configurable delay timers to help mitigate flicker and can support `URLSession` instances not managed by Alamofire. ## Requirements | Platform | Minimum Swift Version | Installation | Status | | --- | --- | --- | --- | | iOS 10.0+ / macOS 10.12+ / tvOS 10.0+ / watchOS 3.0+ | 5.1 | [CocoaPods](#cocoapods), [Carthage](#carthage), [Swift Package Manager](#swift-package-manager), [Manual](#manually) | Fully Tested | | Linux | Latest Only | [Swift Package Manager](#swift-package-manager) | Building But Unsupported | | Windows | Latest Only | [Swift Package Manager](#swift-package-manager) | Building But Unsupported | #### Known Issues on Linux and Windows Alamofire builds on Linux and Windows but there are missing features and many issues in the underlying `swift-corelibs-foundation` that prevent full functionality and may cause crashes. These include: - `ServerTrustManager` and associated certificate functionality is unavailable, so there is no certificate pinning and no client certificate support. - Various methods of HTTP authentication may crash, including HTTP Basic and HTTP Digest. Crashes may occur if responses contain server challenges. - Cache control through `CachedResponseHandler` and associated APIs is unavailable, as the underlying delegate methods aren't called. - `URLSessionTaskMetrics` are never gathered. Due to these issues, Alamofire is unsupported on Linux and Windows. Please report any crashes to the [Swift bug reporter](https://bugs.swift.org). ## Migration Guides - [Alamofire 5.0 Migration Guide](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Alamofire%205.0%20Migration%20Guide.md) - [Alamofire 4.0 Migration Guide](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Alamofire%204.0%20Migration%20Guide.md) - [Alamofire 3.0 Migration Guide](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Alamofire%203.0%20Migration%20Guide.md) - [Alamofire 2.0 Migration Guide](https://github.com/Alamofire/Alamofire/blob/master/Documentation/Alamofire%202.0%20Migration%20Guide.md) ## Communication - If you