iOS Swift如何在我的項目中使用Gif文件

Question

在我的應用程序中，我需要使用.gif，並且我搜索了它。每個人都要求使用UIImage.gifImageWithName("funny")或UIImage.gifWithName("jeremy")來添加.gif文件。但我在Type 'UIImage' has no member 'gifWithName'上遇到錯誤。如何解決這些問題以及如何在我的應用中使用.gif。

Answer 1

下載的UIImage + Gif.swift從https://github.com/bahlo/SwiftGif/tree/master/SwiftGifCommon文件，並把你的項目..

// An animated UIImage 
let Gif = UIImage.gif(name: "jerry") 

// A UIImageView with async loading 
let imageView = UIImageView() 
imageView.loadGif(name: "tom")] 

Answer 2

iOS將不直接支持.gif圖片。您必須使用最新版本的第三方庫，如SDWebImage。簡化的解決方案是使用Webview。

否則， 您可以使用UIImageView+Extension

Answer 3

// 
// GifFunctions.swift 
// GifFunctions 
// 
// Created by Ambu Sangoli on 11/12/16. 
// Copyright © 2016 Ambu Sangoli. All rights reserved. 
// 

import UIKit 
import ImageIO 
fileprivate func < <T : Comparable>(lhs: T?, rhs: T?) -> Bool { 
    switch (lhs, rhs) { 
    case let (l?, r?): 
    return l < r 
    case (nil, _?): 
    return true 
    default: 
    return false 
    } 
} 




extension UIImage { 

    public class func gifImageWithData(_ data: Data) -> UIImage? { 
     guard let source = CGImageSourceCreateWithData(data as CFData, nil) else { 
      print("image doesn't exist") 
      return nil 
     } 

     return UIImage.animatedImageWithSource(source) 
    } 

    public class func gifImageWithURL(_ gifUrl:String) -> UIImage? { 
     guard let bundleURL:URL = URL(string: gifUrl) 
      else { 
       print("image named \"\(gifUrl)\" doesn't exist") 
       return nil 
     } 
     guard let imageData = try? Data(contentsOf: bundleURL) else { 
      print("image named \"\(gifUrl)\" into NSData") 
      return nil 
     } 

     return gifImageWithData(imageData) 
    } 

    public class func gifImageWithName(_ name: String) -> UIImage? { 
     guard let bundleURL = Bundle.main 
      .url(forResource: name, withExtension: "gif") else { 
       print("SwiftGif: This image named \"\(name)\" does not exist") 
       return nil 
     } 
     guard let imageData = try? Data(contentsOf: bundleURL) else { 
      print("SwiftGif: Cannot turn image named \"\(name)\" into NSData") 
      return nil 
     } 

     return gifImageWithData(imageData) 
    } 

    class func delayForImageAtIndex(_ index: Int, source: CGImageSource!) -> Double { 
     var delay = 0.1 

     let cfProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil) 
     let gifProperties: CFDictionary = unsafeBitCast(
      CFDictionaryGetValue(cfProperties, 
       Unmanaged.passUnretained(kCGImagePropertyGIFDictionary).toOpaque()), 
      to: CFDictionary.self) 

     var delayObject: AnyObject = unsafeBitCast(
      CFDictionaryGetValue(gifProperties, 
       Unmanaged.passUnretained(kCGImagePropertyGIFUnclampedDelayTime).toOpaque()), 
      to: AnyObject.self) 
     if delayObject.doubleValue == 0 { 
      delayObject = unsafeBitCast(CFDictionaryGetValue(gifProperties, 
       Unmanaged.passUnretained(kCGImagePropertyGIFDelayTime).toOpaque()), to: AnyObject.self) 
     } 

     delay = delayObject as! Double 

     if delay < 0.1 { 
      delay = 0.1 
     } 

     return delay 
    } 

    class func gcdForPair(_ a: Int?, _ b: Int?) -> Int { 
     var a = a 
     var b = b 
     if b == nil || a == nil { 
      if b != nil { 
       return b! 
      } else if a != nil { 
       return a! 
      } else { 
       return 0 
      } 
     } 

     if a < b { 
      let c = a 
      a = b 
      b = c 
     } 

     var rest: Int 
     while true { 
      rest = a! % b! 

      if rest == 0 { 
       return b! 
      } else { 
       a = b 
       b = rest 
      } 
     } 
    } 

    class func gcdForArray(_ array: Array<Int>) -> Int { 
     if array.isEmpty { 
      return 1 
     } 

     var gcd = array[0] 

     for val in array { 
      gcd = UIImage.gcdForPair(val, gcd) 
     } 

     return gcd 
    } 

    class func animatedImageWithSource(_ source: CGImageSource) -> UIImage? { 
     let count = CGImageSourceGetCount(source) 
     var images = [CGImage]() 
     var delays = [Int]() 

     for i in 0..<count { 
      if let image = CGImageSourceCreateImageAtIndex(source, i, nil) { 
       images.append(image) 
      } 

      let delaySeconds = UIImage.delayForImageAtIndex(Int(i), 
       source: source) 
      delays.append(Int(delaySeconds * 1000.0)) // Seconds to ms 
     } 

     let duration: Int = { 
      var sum = 0 

      for val: Int in delays { 
       sum += val 
      } 

      return sum 
     }() 

     let gcd = gcdForArray(delays) 
     var frames = [UIImage]() 

     var frame: UIImage 
     var frameCount: Int 
     for i in 0..<count { 
      frame = UIImage(cgImage: images[Int(i)]) 
      frameCount = Int(delays[Int(i)]/gcd) 

      for _ in 0..<frameCount { 
       frames.append(frame) 
      } 
     } 

     let animation = UIImage.animatedImage(with: frames, 
      duration: Double(duration)/1000.0) 

     return animation 
    } 
} 

保存上面的代碼中使用任何文件名例如GifFunctions.Swift其添加到您的項目，並使用它像下面

let gifToplay = UIImage.gifImageWithName("YourGifName") 
YourImageView.image = (image: gifToplay) 

你也可以使用其他方法。

享受（Y）