iOS去重 排序

iOS 去重 排序

• 去重

for (NSString *str  in self.sectionIndexTitle) {
        if (![dataArr containsObject:str]) {
            [dataArr addObject:str];
        }
    }
    self.sectionIndexTitle = dataArr;

• 排序

    [self.sectionIndexTitle sortUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
        \\升序 a 、b、c
        return [obj1 compare:obj2];
    }];