ios - 将 UIImage 添加到数组时出现无法识别的选择器错误

Question

我将 UIImage 存储在 NSDictionary 中，然后在应用程序的另一个位置传递 NSDictionary。 gridImages 是一个 NSMutableArray

NSDictionary *pageDict = [pageArray objectAtIndex:0];

UIImage *pageImage = [pageDict objectForKey:@"image"];

[gridImages addObject:pageImage];

页面字典返回

{
    class = is;
    image = "<UIImage: 0x14e20e10>";
    name = kaka;
    page = 64;
}

大概是我做的

UIImage *pageImage = [pageDict objectForKey:@"image"];

但是，当我尝试将该 UIImage 添加到数组时，出现此错误:

-[UIImage stringByDeletingPathExtension]: unrecognized selector sent to instance 0x14e20e10

知道发生了什么吗？

编辑:

对于 NSDictionary，我尝试将 UIImage 存储为 NSData:

NSData *imageData = UIImagePNGRepresentation(textbookImage);
    [pageDict setObject:imageData forKey:@"image"];
    [pageDict setObject:textbookName forKey:@"name"];
    [pageDict setObject:page forKey:@"page"];
    [pageDict setObject:nameOfClass forKey:@"class"];

然后像这样解析它:

  NSData *imageData = [pageDict objectForKey:@"image"];
   UIImage *pageImage = [UIImage imageWithData:imageData];

但是还是报同样的错误

Answer 1

您不能将 UIImage 设置到 NSUserDefaults 中，因为 UIImage 是非属性列表对象。

您最好从文档目录存储图像路径。

这段代码会有所帮助。

//设置图片

NSString *strImagePath = //path of image from documents directory

NSMutableDictionary *dictOne = [NSMutableDictionary dictionaryWithCapacity:0];

[dictOne setObject:strImagePath forKey:@"image"];

[[NSUserDefaults standardUserDefaults] setObject:dictOne forKey:@"dict"];

//获取图片

 NSMutableDictionary *dict = [[NSUserDefaults standardUserDefaults] objectForKey:@"dict"];

    UIImage *image = [UIImage imageWithContentsOfFile:[dict objectForKey@"image"]];

编辑:

 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *documentsDirectory = [paths objectAtIndex:0];
 NSString *strImageFileName = [documentsDirectory stringByAppendingPathComponent:@"yourImageFileName"];
 UIImage *image = // Your image;

 NSData *dataImage = UIImageJPEGRepresentation(image, 0.5f);
 /* Good image quality
        NSData *dataImage = UIImagePNGRepresentation(image); 
 */

[dataImage writeToFile:strImageFileName atomically:YES];

快乐编码。