如何将 UIImage 序列化为 JSON？

我在用

imageData = UIImagePNGRepresentation(imgvw.image);

并在发帖时

[dic setObject:imagedata forKey:@"image"]; 

after

NSData *data = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&theError];

现在应用程序崩溃由于未捕获的异常而终止应用程序'NSInvalidArgumentException'，原因：'JSON 写入中的类型无效 (NSConcreteMutableData)

您需要将 UIImage 转换为 NSData，然后将该 NSData 转换为 NSString，这将是数据的 Base64 字符串表示形式。

从 NSData* 获取 NSString* 后，您可以将其添加到字典中的键 @"image"

要将 NSData 转换为 base64 类型 NSString* 请参考以下链接：如何在 iphone-sdk 上进行 Base64 编码？ https://stackoverflow.com/questions/392464/how-do-i-do-base64-encoding-on-iphone-sdk/800976#800976

以更伪的方式，该过程将如下所示

UIImage *my_image; //your image handle
NSData *data_of_my_image = UIImagePNGRepresentation(my_image);
NSString *base64StringOf_my_image = [data_of_my_image convertToBase64String];

//now you can add it to your dictionary
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
[dict setObject:base64StringOf_my_image forKey:@"image"];

if ([NSJSONSerialization isValidJSONObject:dict]) //perform a check
{
        NSLog(@"valid object for JSON");
        NSError *error = nil;
        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];


        if (error!=nil) {
            NSLog(@"Error creating JSON Data = %@",error);
        }
        else{
            NSLog(@"JSON Data created successfully.");
        }
}
else{
        NSLog(@"not a valid object for JSON");
    }