-(void)addBtn

{      

    NSArray *arr = [[NSArray alloc] initWithObjects:@"未使用",@"已使用",@"已付款",@"退款", nil];

    for (int i = 0; i < 4; i ++) {

        UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

        btn.frame = CGRectMake(16+i*(60+16), 40, 60, 44);

        btn.tag = 10+i;

        [btn setTitle:[arr objectAtIndex:i] forState:UIControlStateNormal];

        [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

        [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];

        if (btn.tag==10) {

            [btn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

        }

        [self addSubview:btn];

    }

}

-(void)btnClick:(UIButton *)sender

{

    static int currentSelectButtonIndex = 0;

    static int previousSelectButtonIndex=10;

    currentSelectButtonIndex=sender.tag;

    UIButton *previousBtn=(UIButton *)[self viewWithTag:previousSelectButtonIndex];

    [previousBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    UIButton *currentBtn = (UIButton *)[self viewWithTag:currentSelectButtonIndex];;

    [currentBtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

    previousSelectButtonIndex=currentSelectButtonIndex;

    NSLog(@">>>>>>>>>%d",currentSelectButtonIndex);

}