UIImage與字符串互轉(zhuǎn)
//圖片轉(zhuǎn)字符串

 -(NSString *)UIImageToBase64Str:(UIImage *) image{
  NSData *data = UIImageJPEGRepresentation(image, 1.0f);
  NSString *encodedImageStr = [data 
  base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
  return encodedImageStr;
  }

//字符串轉(zhuǎn)圖片

-(UIImage *)Base64StrToUIImage:(NSString *)_encodedImageStr{
   NSData *_decodedImageData = [[NSData alloc] 
   initWithBase64Encoding:_encodedImageStr];
   UIImage *_decodedImage = [UIImage imageWithData:_decodedImageData];
    return _decodedImage;
    }

截圖

 // 1. 開啟一個與圖片相關(guān)的圖形上下文
 UIGraphicsBeginImageContextWithOptions(self.view.bounds.size,NO,0.0);

 // 2. 獲取當(dāng)前圖形上下文
  CGContextRef ctx = UIGraphicsGetCurrentContext();

 // 3. 獲取需要截取的view的layer
  [self.view.layer renderInContext:ctx];

   // 4. 從當(dāng)前上下文中獲取圖片
   UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

   // 5. 關(guān)閉圖形上下文
    UIGraphicsEndImageContext();

   // 6. 把圖片保存到相冊
   UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

這樣可以通過把圖片轉(zhuǎn)換為字符串傳輸。。。。