Dekodowanie danych base64 do obrazu

Question

Ten kod nie działa już z Swift 3.

imageData = NSData(base64EncodedString: mediaFile, options: NSDataBase64DecodingOptions.fromRaw(0)!) 

To jest ten.

imageData = NSData(base64EncodedString: mediaFile, options: .allZeros) 

Answer 1

Zamiast NSData wykorzystanie bezpośrednio Swift 3 natywny Data.

if let decodedData = Data(base64Encoded: mediaFile, options: .ignoreUnknownCharacters) { 
    let image = UIImage(data: decodedData) 
} 

Answer 2

Możesz napisać jak ten sposób

let data = NSData(base64Encoded: mediaFile, options: NSData.Base64DecodingOptions(rawValue: 0)) 

nadzieję, że pomoże Ci

Answer 3

Swift

Swift 3.0 nie zaleca się używać NS dłużej i ten sam przypadek z NSData także

if let decodedImageData = Data(base64Encoded: mediaFile, options: .ignoreUnknownCharacters) { 
     let image = UIImage(data: decodedImageData) 
    } 

W Objective-C

NSURL *url = [NSURL URLWithString:base64String];  
NSData *decodedImageData = [NSData dataWithContentsOfURL:url]; 
UIImage *image = [UIImage imageWithData:decodedImageData]; 

Answer 4

I wdrożone to jako przedłużenie UIImage

extension UIImage { 

    /* 
    @brief decode image base64 
    */ 
    static func decodeBase64(toImage strEncodeData: String!) -> UIImage { 

     if let decData = Data(base64Encoded: strEncodeData, options: .ignoreUnknownCharacters), strEncodeData.characters.count > 0 { 
      return UIImage(data: decData)! 
     } 
     return UIImage() 
    } 
} 

Answer 5

swift4:

Czasami ciąg ma prefiks, takich jak data:image/png;base64, co uczyni base64Encoded powraca nil:

extension String { 

    func base64ToImage() -> UIImage? { 

     if let url = URL(string: self),let data = try? Data(contentsOf: url),let image = UIImage(data: data) { 
      return image 
     } 

     return nil 

    } 
} 

---

pełny kod:

extension String { 

    func matches(for regex: String) -> [String] { 

     do { 
      let regex = try NSRegularExpression(pattern: regex) 
      let results = regex.matches(in: self, range: NSRange(self.startIndex..., in: self)) 
      return results.map { 
       self.substring(with: Range($0.range, in: self)!) 
      } 
     } catch let error { 
      print("invalid regex: \(error.localizedDescription)") 
      return [] 
     } 
    } 
} 


let result = text.matches(for: "data:image\\/([a-zA-Z]*);base64,([^\\\"]*)") 
for imageString in result { 
    autoreleasepool { 
     let image = imageString.base64ToImage() 
     } 
    } 
}