访问NSArray中的元素

Question

我有两个班级：

MusicQuestion具有此属性：

@property (nonatomic, strong) NSArray *answers; // array of MPMediaItem

MusicQuiz具有此属性：

@property (nonatomic, strong)   NSMutableArray *questions; // array of MusicQuestion

我想从MusicQuiz answers[0] question[0]内访问[self.question[0] answers] // It only access the entire array of the first question 。我试过这个：

{{1}}

我该怎么做？

Answer 1

您已经访问过答案数组，现在只需访问数组中的项目：

MPMediaItem *item = [self.question[0] answers][0];

Answer 2

NSArray *answers = [self.questions[0] answers];  //This is the answers array of the first question
MPMediaItem *item = answers[0]; //This is that MPMediaItem you want.

Answer 3

MPMediaItem *item = [[self.question[0] answers] objectAtIndex:0];