NSMutableArray *siftArray = [NSMutableArray array];
NSArray *sources = @[@"dfersa",@"adfae",@"frdg",@"rfde",@"drgs",@"wser",@"rfdt",@"pkoi"];
// [self.sources addObjectsFromArray : [JKCountryResout searchCountryNameByStrings:@"china"]];
for (NSString *str in self.sources){
NSString *resoultStr = [str substringToIndex:1];
[siftArray addObject:resoultStr];
}
NSSet *set = [NSSet setWithArray:siftArray];
NSArray *sortDesc = @[[[NSSortDescriptor alloc] initWithKey:nil ascending:YES]];
NSArray *sortSetArray = [set sortedArrayUsingDescriptors:sortDesc];
NSLog(@"排序的结果 %@", sortSetArray);