NSString转换为UIImage

+(NSString *)makeImageToString:(UIImage *)image{
//第一步，先将image转换为data类型
NSData *imageData = UIImageJPEGRepresentation(image, 2.0);
//将NSData类型转换为NSString类型
NSString *string = [imageData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
return string;
}

//NSString转换为UIImage

+(UIImage *)makeStringToImage:(NSString *)string{
//将字符串转换为data类型
NSData *strData = [[NSData alloc]initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters];
//将data转换为图片
UIImage *image = [UIImage imageWithData:strData];
return image;
}