swift oc UIimage 和 NSString 互相转换

#swift         let image = UIImage.init(named: "1024-01")                 /// t图片转data         let data = UIImagePNGRepresentation(image!)         // data 转string 注意是base64EncodedStringWithOptions 这个方法不能使用         [NSString.init(data: <#T##NSData#>, encoding: <#T##UInt#>)] 必须是这个编码

let str = data?.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)

// string转data                  let data1 = NSData(base64EncodedString:str!,options: .IgnoreUnknownCharacters)         // data 转 图片         let image2 = UIImage.init(data: data1!)                  print(image2)                   #oc

UIImage *image = [UIImage imageNamed:@"640"];     NSData *data = UIImagePNGRepresentation(image);     NSString *str = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];          NSLog(@"%@",str);               NSData *data1 = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];     UIImage *image1 = [[UIImage alloc] initWithData:data1];     NSLog(@"%@",image1);