UIReferenceLibraryViewController:App中字典词义查询的实现

UIReferenceLibraryViewController能够实现在自己的应用中使用字典查询词语的含义.

在使用词典之前,需要用dictionaryHasDefinitionForTerm:方法去判断词典中是否有所选词的解释,如果有,则初始化UIReferenceLibraryViewController展示词语的释义.

    if ([UIReferenceLibraryViewController dictionaryHasDefinitionForTerm:@"English"]) {
        UIReferenceLibraryViewController *reference = [[UIReferenceLibraryViewController alloc] initWithTerm:@"English"];
        [self presentViewController:reference animated:YES completion:nil];
    }