iOS Development UI chapter-Creating a navigation controller and the life cycle of a controller using storyboard

The jar package is Commons-codec.jar.

Pnuts

//base64 is decoded into a picture
Function gldBase64ToImage(imgStr,imgFilePath) {
// Base64 decoding of byte array strings and generating images
     If ("".equals(imgStr) || imgStr == null) // Image data is empty
         Return false
        
//When transcoding, it may have a prefix format, so you need to split and take a valid string.
     imgArr = imgStr.split(",")
     If(imgArr.length == 1){
        imgStr = imgArr[0]
     }else{
         imgStr = imgArr[1]
     }
    
     imgByte = class org.apache.commons.codec.binary.Base64::decodeBase64(imgStr)

     // Base64 decoding
     For (i = 0; i < imgByte.length; ++i) {
         If (imgByte[i] < 0) {// Adjust the exception data
             imgByte[i] += 256;
         }
     }
     Out = class java.io.FileOutputStream(imgFilePath)
     Out.write(imgByte)
     Out.flush()
     Out.close()
} 

Java

/**
       * Base64 decoding of byte array strings and generating images
       * @param imgStr image data
       * @param imgFilePath save image full path address
       * @return
       */
      Public static boolean generateImage(String imgStr,String imgFilePath){
          //
          If ( "".equals(imgStr) || imgStr == null) //The image data is empty
              Return false;
      
          Try
          {
              //Base64 decoding
              Byte[] b = Base64.decodeBase64(imgStr);
              For(int i=0;i<b.length;++i)
              {
                  If(b[i]<0)
                  {//Adjust exception data
                      b[i]+=256;
                  }
              }
              / / Generate jpeg picture
 
              OutputStream out = new FileOutputStream(imgFilePath);
              Out.write(b);
              Out.flush();
              Out.close();
              Return true;
          }
          Catch (Exception e)
          {
              Return false;
          }
      }
  }

iOS Development UI chapter-Creating a navigation controller and the life cycle of a controller using storyboard