NSURLConnection 是否保留其委托

NSURLConnection 类是 iOS 开发中常用的一个类，用于进行网络请求和数据传输。在使用 NSURLConnection 进行网络请求时，我们可以选择是否保留其委托。本文将探讨 NSURLConnection 是否保留其委托的影响，并提供相应的案例代码进行演示。

swift
import UIKit
class ViewController: UIViewController, NSURLConnectionDelegate {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let url = URL(string: "https://api.example.com/data")
        let request = URLRequest(url: url!)
        let connection = NSURLConnection(request: request, delegate: self)
        connection?.start()
    }
    
    // NSURLConnectionDelegate 方法实现
    func connection(_ connection: NSURLConnection, didReceiveResponse response: URLResponse) {
        // 处理请求响应
    }
    
    func connection(_ connection: NSURLConnection, didReceiveData data: Data) {
        // 处理接收到的数据
    }
    
    func connectionDidFinishLoading(_ connection: NSURLConnection) {
        // 请求完成
    }
    
    func connection(_ connection: NSURLConnection, didFailWithError error: Error) {
        // 处理错误
    }
}

swift
import UIKit
class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let url = URL(string: "https://api.example.com/data")
        let request = URLRequest(url: url!)
        
        NSURLConnection.sendAsynchronousRequest(request, queue: OperationQueue.main) { (response, data, error) in
            if let error = error {
                // 处理错误
            } else {
                // 处理请求响应和接收到的数据
            }
        }
    }
}