blocks|key|534211|text|@implementation+UIImage+(Extended)

-+(NSString+*)base64String+{
++++NSData+*+data+=+[UIImagePNGRepresentation(self)+base64EncodedDataWithOptions:NSDataBase64Encoding64CharacterLineLength];
++++return+[NSString+stringWithUTF8String:[data+bytes]];
}

@end|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|534212|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>@implementation UIImage (Extended)

- (NSString *)base64String {
    NSData * data = [UIImagePNGRepresentation(self) base64EncodedDataWithOptions:NSDataBase64Encoding64CharacterLineLength];
    return [NSString stringWithUTF8String:[data bytes]];
}

@end
</code></pre>


blocks|key|317246|text|对于iOS+7%2B，Objective-C，下面是如何从图像URL开始进行转换的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317247|NSURL+*url+=+[NSURL+URLWithString:self.groove.thumbnailURL];

UIImage+*image+=+[UIImage+imageWithData:[NSData+dataWithContentsOfURL:url]];

NSString+*base64String+=+[UIImagePNGRepresentation(image)
base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];|code-block|syntax|javascript|317248|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>For iOS 7+, Objective-C, here's how to make the conversion starting with an image URL:</p>

<pre><code>NSURL *url = [NSURL URLWithString:self.groove.thumbnailURL];

UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];

NSString *base64String = [UIImagePNGRepresentation(image)
base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
</code></pre>


blocks|key|317254|text|Swift+iOS8|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317255|//+prgm+mark+----+

//+convert+images+into+base64+and+keep+them+into+string

func+convertImageToBase64(image:+UIImage)+->+String+{

++++var+imageData+=+UIImagePNGRepresentation(image)
++++let+base64String+=+imageData.base64EncodedStringWithOptions(.allZeros)

++++return+base64String

}//+end+convertImageToBase64


//+prgm+mark+----

//+convert+images+into+base64+and+keep+them+into+string

func+convertBase64ToImage(base64String:+String)+->+UIImage+{

++++let+decodedData+=+NSData(base64EncodedString:+base64String,+options:+NSDataBase64DecodingOptions(rawValue:+0)+)

++++var+decodedimage+=+UIImage(data:+decodedData!)

++++return+decodedimage!

}//+end+convertBase64ToImage|code-block|syntax|javascript|317256|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Swift iOS8 </p>

<pre><code>// prgm mark ---- 

// convert images into base64 and keep them into string

func convertImageToBase64(image: UIImage) -&gt; String {

    var imageData = UIImagePNGRepresentation(image)
    let base64String = imageData.base64EncodedStringWithOptions(.allZeros)

    return base64String

}// end convertImageToBase64


// prgm mark ----

// convert images into base64 and keep them into string

func convertBase64ToImage(base64String: String) -&gt; UIImage {

    let decodedData = NSData(base64EncodedString: base64String, options: NSDataBase64DecodingOptions(rawValue: 0) )

    var decodedimage = UIImage(data: decodedData!)

    return decodedimage!

}// end convertBase64ToImage
</code></pre>


blocks|key|317285|text|Swift-Extension：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317286|extension+UIImage{
+++++func+toBase64()+->+String{
++++++++++var+imageData+=+UIImagePNGRepresentation(self)
++++++++++return+imageData.base64EncodedStringWithOptions(.allZeros)
+++++}
}|code-block|syntax|javascript|317287|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Swift-Extension:</p>

<pre><code>extension UIImage{
     func toBase64() -&gt; String{
          var imageData = UIImagePNGRepresentation(self)
          return imageData.base64EncodedStringWithOptions(.allZeros)
     }
}
</code></pre>


blocks|key|534332|text|See+my+class+-++AppExtension.swift


//+MARK:+-+UIImage+(Base64+Encoding)

public+enum+ImageFormat+{
++++case+PNG
++++case+JPEG(CGFloat)
}

extension+UIImage+{

++++public+func+base64(format:+ImageFormat)+->+String+{
++++++++var+imageData:+NSData
++++++++switch+format+{
++++++++case+.PNG:+imageData+=+UIImagePNGRepresentation(self)
++++++++case+.JPEG(let+compression):+imageData+=+UIImageJPEGRepresentation(self,+compression)
++++++++}
++++++++return+imageData.base64EncodedStringWithOptions(.allZeros)
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|534333|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>See my class -  AppExtension.swift


// MARK: - UIImage (Base64 Encoding)

public enum ImageFormat {
    case PNG
    case JPEG(CGFloat)
}

extension UIImage {

    public func base64(format: ImageFormat) -&gt; String {
        var imageData: NSData
        switch format {
        case .PNG: imageData = UIImagePNGRepresentation(self)
        case .JPEG(let compression): imageData = UIImageJPEGRepresentation(self, compression)
        }
        return imageData.base64EncodedStringWithOptions(.allZeros)
    }
}
</code></pre>


blocks|key|317328|text|在swift+2.0中使用此扩展(归功于Jonas+Franz)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317329|extension+UIImage{
++func+toBase64()+->+String{
++++let+imageData+=+UIImagePNGRepresentation(self)!
++++return+imageData.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)
++}
}|code-block|syntax|javascript|317330|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>In swift 2.0 use this extension (credit to Jonas Franz)</p>

<pre><code>extension UIImage{
  func toBase64() -&gt; String{
    let imageData = UIImagePNGRepresentation(self)!
    return imageData.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)
  }
}
</code></pre>


blocks|key|317364|text|在Swift+3.0和Xcode+8.0中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317365|编码：|317366|let+userImage:UIImage+=+UIImage(named:+"Your-Image_name")!
let+imageData:NSData+=+UIImagePNGRepresentation(userImage)!+as+NSData
let+dataImage+=+imageData.base64EncodedString(options:+.lineLength64Characters)|code-block|syntax|javascript|317367|解码：|317368|let+imageData+=+dataImage
let+dataDecode:NSData+=+NSData(base64Encoded:+imageData!,+options:.ignoreUnknownCharacters)!
let+avatarImage:UIImage+=+UIImage(data:+dataDecode+as+Data)!
yourImageView.image+=+avatarImage|317369|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

<h1>In Swift 3.0 and Xcode 8.0</h1>

<h2>Encoding :</h2>

<pre><code>let userImage:UIImage = UIImage(named: "Your-Image_name")!
let imageData:NSData = UIImagePNGRepresentation(userImage)! as NSData
let dataImage = imageData.base64EncodedString(options: .lineLength64Characters)
</code></pre>

<h2>Decoding :</h2>

<pre><code>let imageData = dataImage
let dataDecode:NSData = NSData(base64Encoded: imageData!, options:.ignoreUnknownCharacters)!
let avatarImage:UIImage = UIImage(data: dataDecode as Data)!
yourImageView.image = avatarImage
</code></pre>


blocks|key|534455|text|Swift+3.0和Xcode+8.0|type|unstyled|depth|inlineStyleRanges|entityRanges|data|534456|let+imageData+=+UIImageJPEGRepresentation(imageView.image!,+1)

++++let+base64String+=+(imageData!+as+Data).base64EncodedString(options:+NSData.Base64EncodingOptions(rawValue:+0))
++++print(base64String)|code-block|syntax|javascript|534457|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Swift 3.0 and Xcode 8.0</p>

<pre><code>let imageData = UIImageJPEGRepresentation(imageView.image!, 1)

    let base64String = (imageData! as Data).base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))
    print(base64String)
</code></pre>


blocks|key|534506|text|我尝试了所有的解决方案，没有一个对我有效(使用Swift+4)，这是对我有效的解决方案，如果将来有人面临同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|534507|let+temp+=+base64String.components(separatedBy:+",")
let+dataDecoded+:+Data+=+Data(base64Encoded:+temp[1],+options:+
+.ignoreUnknownCharacters)!
let+decodedimage+=+UIImage(data:+dataDecoded)

yourImage.image+=+decodedimage|code-block|syntax|javascript|534508|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>I tried all the solutions, none worked for me (using Swift 4), this is the solution that worked for me, if anyone in future faces the same problem.</p>

<pre><code>let temp = base64String.components(separatedBy: ",")
let dataDecoded : Data = Data(base64Encoded: temp[1], options: 
 .ignoreUnknownCharacters)!
let decodedimage = UIImage(data: dataDecoded)

yourImage.image = decodedimage
</code></pre>


blocks|key|534520|text|Swift+4.2+%7C+Xcode+10|type|unstyled|depth|inlineStyleRanges|entityRanges|data|534521|extension+UIImage+{

++++///+EZSE:+Returns+base64+string
++++public+var+base64:+String+{
++++++++return+self.jpegData(compressionQuality:+1.0)!.base64EncodedString()
++++}
}|code-block|syntax|javascript|534522|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Swift 4.2 | Xcode 10</p>

<pre><code>extension UIImage {

    /// EZSE: Returns base64 string
    public var base64: String {
        return self.jpegData(compressionQuality: 1.0)!.base64EncodedString()
    }
}
</code></pre>


blocks|key|317507|text|//convert+Image+to+Base64+(Encoding)

let+strBase64+=+imageData.base64EncodedString(options:+.lineLength64Characters)

print(strBase64)

//+convert+Base64+to+Image+(Decoding)

let+dataDecoded:NSData+=+NSData(base64EncodedString:+strBase64,+options:+NSDataBase64DecodingOptions(rawValue:+0))!

let+decodedimage:UIImage+=+UIImage(data:+dataDecoded)!

print(decodedimage)

yourImageView.image+=+decodedimage|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|317508|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>//convert Image to Base64 (Encoding)

let strBase64 = imageData.base64EncodedString(options: .lineLength64Characters)

print(strBase64)

// convert Base64 to Image (Decoding)

let dataDecoded:NSData = NSData(base64EncodedString: strBase64, options: NSDataBase64DecodingOptions(rawValue: 0))!

let decodedimage:UIImage = UIImage(data: dataDecoded)!

print(decodedimage)

yourImageView.image = decodedimage
</code></pre>


blocks|key|317557|text|使用便捷初始化器进行解码-+Swift+5|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317558|extension+UIImage+{
++++convenience+init?(base64String:+String)+{
++++++++guard+let+data+=+Data(base64Encoded:+base64String)+else+{+return+nil+}
++++++++self.init(data:+data)
++++}
}+|code-block|syntax|javascript|317559|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Decoding using convenience initialiser - Swift 5</p>
<pre><code>extension UIImage {
    convenience init?(base64String: String) {
        guard let data = Data(base64Encoded: base64String) else { return nil }
        self.init(data: data)
    }
} 
</code></pre>


<p>Does anyone know how to convert a <code>UIImage</code> to a Base64 string, and then reverse it?</p>

<p>I have the below code; the original image before encoding is good, but I only get a blank image after I encode and decode it.</p>

<pre><code>NSData *imageData = UIImagePNGRepresentation(viewImage);

NSString *b64EncStr = [self encode: imageData];

NSString *base64String = [self encodeBase64:imageData];
</code></pre>


Convert between UIImage and Base64 string

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋 

腾讯云代码助手

CODING DevOps

Cloud Studio

SDK中心

API中心

命令行工具

有人知道如何将UIImage转换为Base64字符串，然后将其反转吗？我有以下代码；编码前的原始图像是好的，但我只有在编码和解码后才得到空白图像。NSData *imageData = UIImagePNGRepresentation(viewImage);NSString *b64EncStr = [self enc...

问在UIImage和Base64字符串之间转换
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在UIImage和Base64字符串之间转换EN