Ios 遍历块中的数组进行排序´；s成员

如何在这样的块中获取

[index]

处的对象？它的目的是获取它的第一个字母，并按字典顺序对NSD字典数组进行排序

NSArray *sortedArray;
sortedArray = [_photos sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
    NSString *first = _photos[0][FLICKR_PHOTO_TITLE];
    NSString *second = _photos[0][FLICKR_PHOTO_TITLE];
    return [first compare:second];
}];
_photos = sortedArray;

---

看起来您有一系列字典。要根据

FLICKR\u PHOTO\u TITLE

键的值进行排序，请执行以下操作：

_photos = [_photos sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *a, NSDictionary *b) {
    NSString *first = a[FLICKR_PHOTO_TITLE];
    NSString *second = b[FLICKR_PHOTO_TITLE];
    return [first compare:second];
}];