segmentedControl打开顺序颠倒

 - (void)viewDidLoad
    {
   [super viewDidLoad];

    [self.segmentedControl removeAllSegments];
    s = 0;
    for (NSDictionary *dictionary in self.top.segments) {
        [_segmentedControl insertSegmentWithTitle:dictionary [@"sTitle"] atIndex:s animated:NO];
        self.bioTextView.text = [NSString stringWithFormat:@"%@", dictionary [@"sData"]];
    }}

为什么segmentedControl以颠倒的顺序开始？请高手指点。谢谢

变量 s的值一直为0 ,没有在执行完成后累加

 for (NSDictionary *dictionary in self.top.segments) {
        [_segmentedControl insertSegmentWithTitle:dictionary [@"sTitle"] atIndex:s animated:NO];
        self.bioTextView.text = [NSString stringWithFormat:@"%@", dictionary [@"sData"]];
        s++; //这里来累加
    }}