如何将NSDictionary添加到NSArray以在TableView中使用它

Question

NSDictionary *recipe = arrayOfPlist[i];

that I use it in a for loop

and in a if statement I added this dictionary to an NSArray results= [recipe allValues]; like this

and I segue it like this

     destViewController.filteredContent=results;

I checked it the results array is not null but when I compile it and try to go to a PageView with selected array I'm having this exception

 *** Terminating app due to uncaught exception 'NSUnknownKeyException', 
reason: '[<__NSCFString 0x109268e40> valueForUndefinedKey:]: this class is not key value coding-compliant for the key recipeName.'

RecipeName is a key from my Dictionary which I use it to write to cell.

I couldn't see the problem so I came here.

---

It turned out that s not my real problem. The crash happened at the next view controller which is a pageViewController. I passed the results array and it should only have 1 elements in it but when i checked it it says the count 8= number of keys in my dictionaries. It added all of the keys as a unique array element and thats where the problem happened. There is really not a recipeName ...

how can i fix this??

<plist version="1.0">
<array>
    <dict>
        <key>category</key>
        <string>desert</string>
        <key>numberOfPerson</key>
        <string>3</string>
        <key>recipeImage</key>
        <string>asdd.jpg</string>
        <key>time</key>
        <string>15</string>
        <key>recipeName</key>
        <string>Puding</string>
        <key>recipeDetail</key>

the count is 8 for this reason. It consider each key as an array element.

Answer 1

The error clearly says "There is no value for the key recipeName".

Just write the below code to make sure.

NSArray *arrayOfPlist = [[NSArray alloc] initWithContentsOfFile:path]; 
recipe = arrayOfPlist[i]; 

NSString *myValue = [recipe valueForKey:@"recipeName"];
NSLog("value is %@", myValue);

Or Just try this and cross check the log

for (id key in dictionary)
{
    NSLog(@"key: %@, value: %@ \n", key, [dictionary objectForKey:key]);
}

Also, please check the xib file. verify that, there is no "recipeName" linked to your implementation file as IBOutlet.

Answer 2

To fix your error, change

results = [recipe allValues];

to:

results = @[recipe];

---

Explanation:

<__NSCFString XxXXXXXXXXX> valueForUndefinedKey:]: this class is not key value coding-compliant for the key ...

The error tells us:

1. Object is a string
2. Method causing the error is valueForUndefinedKey: ( due to a -valueForKey: )
   • since the string was not set up properly to handle -valueForKey:

For -valueForKey: to work, NSString will reference a value from a key ( which indicates that a specified key should have a related value ).
But in your case, results = [recipe allValues]; has returned you an array of only strings and not key-value pairs ( ie not a dictionary ) and hence valueForKey:@"recipeName" will cause an error since the recipeName is taken as a key and it does not have a related value.

Example:

//this will not cause the error
NSDictionary *dctTest = @{@"recipeName": @"Pancakes"};
NSString *strSuccess = [dctTest valueForKey:@"recipeName"];

//this will cause the error
NSArray *arrTest = @[@"Pancakes"];
NSString *strError = [arrTest valueForKey:@"recipeName"];