NSDataBase64DecodingOptions is returning nil value

问题

I am trying to parse base64 type into imageData. But my NSDataBase64DecodingOptions returns nil. I printed decodedData and it is nil. My code is here

var base64String = arrayText["auto_type_android_img"] as String

println("basestring64 is \(base64String)")

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

println("base string is: \(decodedData)")
if let decodedImage = UIImage(data: decodedData!) {

    imageTypeOfCar?.image = decodedImage
}

回答1:

Your base64String is

data:image/png;base64,iVBORw0KGgoA......YII=

The initial "data:image/png;base64," is not part of the Base64 encoding and must be removed before the string can be decoded:

if let range = base64String.rangeOfString("data:image/png;base64,", options: .AnchoredSearch)  {
    base64String.removeRange(range)
}

Then

let decodedData = NSData(base64EncodedString: base64String, options: nil)
if let decodedImage = UIImage(data: decodedData!) {
    imageTypeOfCar?.image = decodedImage
}

succeeds and displays

来源：https://stackoverflow.com/questions/29438793/nsdatabase64decodingoptions-is-returning-nil-value