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我正在研究一個函數,該函數允許我從.plist中選擇一個隨機詞典,它可以播放2個字符串,這個問題和答案可以正常工作。但是有時選擇相同的字典。隨機函數可能每次都顯示一個唯一的字典嗎?謝謝。從plist中選擇獨特的隨機詞典
的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;
你會碰巧知道我嘗試removeLastObject的語法:數組和RemoveObjectAtIndex:questionIndex但他們沒有工作 – waqqas 2011-03-24 17:10:19