有人知道如何将一个UIImage转换为Base64字符串,然后反转它吗?
我有以下代码;编码前的原始图像是好的,但编码解码后只得到一个空白图像。
NSData *imageData = UIImagePNGRepresentation(viewImage);
NSString *b64EncStr = [self encode: imageData];
NSString *base64String = [self encodeBase64:imageData];
有人知道如何将一个UIImage转换为Base64字符串,然后反转它吗?
我有以下代码;编码前的原始图像是好的,但编码解码后只得到一个空白图像。
NSData *imageData = UIImagePNGRepresentation(viewImage);
NSString *b64EncStr = [self encode: imageData];
NSString *base64String = [self encodeBase64:imageData];
当前回答
//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
其他回答
斯威夫特
首先我们需要image的NSData
//Use image name from bundle to create NSData
let image : UIImage = UIImage(named:"imageNameHere")!
//Now use image to create into NSData format
let imageData:NSData = UIImagePNGRepresentation(image)!
//OR next possibility
//Use image's path to create NSData
let url:NSURL = NSURL(string : "urlHere")!
//Now use image to create into NSData format
let imageData:NSData = NSData.init(contentsOfURL: url)!
Swift 2.0 >编码
let strBase64:String = imageData.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)
Swift 2.0 >解码
let dataDecoded:NSData = NSData(base64EncodedString: strBase64, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)!
Swift 3.0 >解码
let dataDecoded : Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!
编码:
let strBase64 = imageData.base64EncodedString(options: .lineLength64Characters)
print(strBase64)
解码:
let dataDecoded:NSData = NSData(base64EncodedString: strBase64, options: NSDataBase64DecodingOptions(rawValue: 0))!
let decodedimage:UIImage = UIImage(data: dataDecoded)!
print(decodedimage)
yourImageView.image = decodedimage
斯威夫特3.0
let dataDecoded : Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!
let decodedimage = UIImage(data: dataDecoded)
yourImageView.image = decodedimage
objective - c
iOS7 >版本
你可以使用NSData的base64EncodedStringWithOptions
编码:
- (NSString *)encodeToBase64String:(UIImage *)image {
return [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}
解码:
- (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {
NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];
return [UIImage imageWithData:data];
}
iOS 6.1和<版本
第一个选项:使用这个链接来编码和解码图像
在项目中添加Base64类。
编码:
NSData* data = UIImageJPEGRepresentation(yourImage, 1.0f);
NSString *strEncoded = [Base64 encode:data];
解码:
NSData* data = [Base64 decode:strEncoded ];;
image.image = [UIImage imageWithData:data];
另一种选择:使用qutilities进行编码和解码
斯威夫特5
编码
func convertImageToBase64String (img: UIImage) -> String {
return img.jpegData(compressionQuality: 1)?.base64EncodedString() ?? ""
}
解码
func convertBase64StringToImage (imageBase64String:String) -> UIImage {
let imageData = Data(base64Encoded: imageBase64String)
let image = UIImage(data: imageData!)
return image!
}
注意:在xcode 10.2中测试
斯威夫特4
编码
func convertImageToBase64String (img: UIImage) -> String {
let imageData:NSData = UIImageJPEGRepresentation(img, 0.50)! as NSData //UIImagePNGRepresentation(img)
let imgString = imageData.base64EncodedString(options: .init(rawValue: 0))
return imgString
}
解码
func convertBase64StringToImage (imageBase64String:String) -> UIImage {
let imageData = Data.init(base64Encoded: imageBase64String, options: .init(rawValue: 0))
let image = UIImage(data: imageData!)
return image
}
注意:在xcode 9.4.1中测试
Swift-Extension:
extension UIImage{
func toBase64() -> String{
var imageData = UIImagePNGRepresentation(self)
return imageData.base64EncodedStringWithOptions(.allZeros)
}
}
斯威夫特3.0
将图像转换为base64字符串
操场测试
var logo = UIImage(named: "image_logo")
let imageData:Data = UIImagePNGRepresentation(logo)
let base64String = imageData.base64EncodedString()
print(base64String)
斯威夫特5号,Xcode 10号。
let imageData = UIImage(named:“imagename”).pngData()?.base64EncodedString(选项: .lineLength64Characters) 打印(图像数据)