iPhone：如何使用NSUserDefaults存储UIImage？ [英] iPhone:How can I store UIImage using NSUserDefaults?

问题描述

我无法使用nsuserdefaults保存图像，并且崩溃了我的应用程序，我还使用自定义类UserInfo使用

I cannot save image using nsuserdefaults and crash my app and I also used custom class UserInfo which used

-(void)encodeWithCoder:(NSCoder *)encoder
{
   NSData *imageData = UIImagePNGRepresentation(categoryImage);
   [encoder encodeObject:categoryName forKey:@"name"];
   [encoder encodeObject:imageData forKey:@"image"];
}

- （id）initWithCoder：（NSCoder *）解码器和 userInfo .categoryImage是UIImage变量。

-(id)initWithCoder:(NSCoder *)decoder and userInfo.categoryImage is UIImage variable.

reason：' - [UIImage encodeWithCoder：]：unrecognized selector sent to instance 0x7676a70' / p>

reason: '-[UIImage encodeWithCoder:]: unrecognized selector sent to instance 0x7676a70'

userInfo = [[UserInfo alloc] init];

userInfo.categoryName = categoryName.text;
NSLog(@"Category Name:--->%@",userInfo.categoryName);

userInfo.categoryImage = image;

appDelegate.categoryData = [[NSMutableDictionary dictionaryWithObjectsAndKeys:
                                 userInfo.categoryName, @"name",userInfo.categoryImage,@"image", nil] mutableCopy];


[appDelegate.categories addObject:appDelegate.categoryData];
NSLog(@"Category Data:--->%@",appDelegate.categories);

[appDelegate.categories addObject:userInfo.categoryName];
[appDelegate.categories addObject:userInfo.categoryImage];

[self saveCustomObject:userInfo.categoryName];

[self saveCustomObject:userInfo.categoryImage];


-(void)saveCustomObject:(UserInfo *)obj
{
    appDelegate.userDefaults = [NSUserDefaults standardUserDefaults];
    NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:obj];


    [appDelegate.userDefaults setObject:myEncodedObject forKey:@"myEncodedObjectKey"];
}

因此请帮助我如何使用nsusedefaults存储和检索uiimage？

So Please help me how can i store and retrieve uiimage using nsusedefaults???

推荐答案

UIImage没有实现NSCoding协议，这是为什么你有错误。

UIImage does not implement NSCoding protocol, this is why you have the error.

存储：

NSData* imageData = UIImagePNGRepresentation(image);
NSData* myEncodedImageData = [NSKeyedArchiver archivedDataWithRootObject:imageData];
[appDelegate.userDefaults setObject:myEncodedImageData forKey:@"myEncodedImageDataKey"];
}

还原：

NSData* myEncodedImageData = [appDelegate.userDefaults objectForKey:@"myEncodedImageDataKey"];
UIImage* image = [UIImage imageWithData:myEncodedImageData];

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