Select unique random dictionary from plist

Question

I am working on a function that allows me to select a random dictionary from a .plist that dis plays 2 string a question and answer which works fine. However sometimes the same dictionary is selected. Is it possible for the random function to show a unique dictionary each time? Thanks.

plist:

<dict>
<key>questions</key>
<array>
    <dict>
        <key>question</key>
        <string>q1</string>
        <key>answer</key>
        <string>a1</string>
    </dict>
    <dict>
        <key>question</key>
        <string>q2</string>
        <key>answer</key>
        <string>a2</string>
    </dict>
    <dict>
        <key>question</key>
        <string>q3</string>
        <key>answer</key>
        <string>a3</string>
    </dict>
</array>

.m:

    NSString *path = [[NSBundle mainBundle] pathForResource:@"qs" ofType:@"plist"];
    NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithContentsOfFile:path];

    NSMutableArray *array = [dict objectForKey:@"questions"];

    int questionIndex = arc4random() %[array count];

    NSDictionary *question = [array objectAtIndex:questionIndex];
    NSString *answerStr = [question objectForKey:@"answer"];
    NSString *questionStr = [question objectForKey:@"question"];

    label1.text = answerStr;
    label2.text = questionStr;

Answer 1

If you don't want to show the same dictionary twice, either:

• keep track of the dictionaries you have shown. If you select one for a second time, try again
• when you choose a dictionary, remove it from the array of choices.