swift中的print() vs debugPrint()

这是一个简单的问题，但 print()debugPrint()之间的是否清晰的理解

///     print("One two three four five")
///     // Prints "One two three four five"
///
///     print(1...5)
///     // Prints "1...5"
///
///     print(1.0, 2.0, 3.0, 4.0, 5.0)
///     // Prints "1.0 2.0 3.0 4.0 5.0"

/// - Parameters:
///   - items: Zero or more items to print.
///   - separator: A string to print between each item. The default is a single
///     space (`" "`).
///   - terminator: The string to print after all items have been printed. The
///     default is a newline (`"\n"`).

public func print(_ items: Any..., separator: String = " ", terminator: String = "\n")


///     debugPrint(1...5)
///     // Prints "ClosedRange(1...5)"
public func debugPrint(_ items: Any..., separator: String = " ", terminator: String = "\n")

从方法描述 及官方示例都几乎一样

使用print()是一种常规方式，可以看到您正在创建的内容。它不显示表示打印变量不必要的“不相关”信息。 例如

print("test")
// prints: test

但是，使用debugPrint()会将推断类型添加到输出中。 例如

debugPrint("test")
// prints: "test"

请注意它如何添加引号以告知您它是一个字符串。 Erica Sadun创造了这两个函数如何不同的完美示例： Swift: Logging

当您需要有关打印到控制台的内容的更多信息时，可以使用debugPrint。附加信息通常对调试很有用。 

print() - 将给定项目的文本表示写入标准输出。

 debugPrint() - 将最适合调试的给定项的文本表示写入标准输出。 基本上，debugPrint添加了对调试类型信息等有用的附加信息。 一个例子：

let urlReq = URLRequest(url: URL(string: "https://itunes.apple.com/search?term=jack+johnson&limit=1")!)
Alamofire.request(urlReq).responseJSON { (data) in
       print(data)
       print("\n\n\n\n\n\n\n\n\n")
       debugPrint(data)
   }

print 控制台输出(删除一些响应字段) 用于打印

SUCCESS: {
    resultCount = 1;
    results =     (
                {
            artistId = 909253;
            artistName = "Jack Johnson";
            artistViewUrl = "https://itunes.apple.com/us/artist/jack-johnson/id909253?uo=4";
        }
    );
}

对于debugPrint

[Request]: GET https://itunes.apple.com/search?term=jack+johnson&limit=1
[Response]: <NSHTTPURLResponse: 0x610000223860> { URL: https://itunes.apple.com/search?term=jack+johnson&limit=1 } { status code: 200, headers {
    "Access-Control-Allow-Origin" = "*";
    "Cache-Control" = "max-age=86345";
    Connection = "keep-alive";
    "Content-Disposition" = "attachment; filename=1.txt";
    "Content-Length" = 1783;
    "Content-Type" = "text/javascript; charset=utf-8";
    Date = "Sat, 23 Sep 2017 14:29:11 GMT";
    "Strict-Transport-Security" = "max-age=31536000";
    Vary = "Accept-Encoding";
    "X-Apple-Partner" = "origin.0";
    "X-Cache" = "TCP_MISS from a23-76-156-143.deploy.akamaitechnologies.com (AkamaiGHost/9.1.0.4-20866905) (-)";
    "X-Cache-Remote" = "TCP_MISS from a23-45-232-92.deploy.akamaitechnologies.com (AkamaiGHost/9.1.0.4-20866905) (-)";
    "X-True-Cache-Key" = "/L/itunes.apple.com/search ci2=limit=1&term=jack+johnson__";
    "apple-originating-system" = MZStoreServices;
    "apple-seq" = 0;
    "apple-timing-app" = "86 ms";
    "apple-tk" = false;
    "x-apple-application-instance" = 1000492;
    "x-apple-application-site" = NWK;
    "x-apple-jingle-correlation-key" = VEF3J3UWCHKUSGPHDZRI6RB2QY;
    "x-apple-orig-url" = "https://itunes.apple.com/search?term=jack+johnson&limit=1";
    "x-apple-request-uuid" = "a90bb4ee-9611-d549-19e7-1e628f443a86";
    "x-apple-translated-wo-url" = "/WebObjects/MZStoreServices.woa/ws/wsSearch?term=jack+johnson&limit=1&urlDesc=";
    "x-content-type-options" = nosniff;
    "x-webobjects-loadaverage" = 0;
} }
[Data]: 1783 bytes
[Result]: SUCCESS: {
    resultCount = 1;
    results =     (
                {
            artistId = 909253;
            artistName = "Jack Johnson";
            artistViewUrl = "https://itunes.apple.com/us/artist/jack-johnson/id909253?uo=4";
        }
    );
}
[Timeline]: Timeline:
{
  "Request Start Time": 527869893.013,
  "Initial Response Time": 527869893.033,
  "Request Completed Time": 527869893.034,
  "Serialization Completed Time": 527869893.035,
  "Latency": 0.020secs,
  "Request Duration": 0.021secs,
  "Serialization Duration": 0.001secs,
  "Total Duration": 0.021secs
}