计步器最多最小值自己输入(OC)

  UILabel* label = [[UILabel alloc]initWithFrame:CGRectMake(10, 70, 60, 30)];    label.text = @"最小值";    [self.view addSubview:label];    UITextField* Txt1 = [[UITextField alloc]initWithFrame:CGRectMake(80, 70, 200, 30)];    Txt1.backgroundColor = [UIColor grayColor];    Txt1.tag = 2;    [self.view addSubview:Txt1];    UILabel* label1 = [[UILabel alloc]initWithFrame:CGRectMake(10, 120, 60, 30)];    label1.text = @"最大值";    [self.view addSubview:label1];    UITextField* Txt2 = [[UITextField alloc]initWithFrame:CGRectMake(80, 120, 200, 30)];    Txt2.backgroundColor = [UIColor grayColor];    Txt2.tag = 4;    [self.view addSubview:Txt2];    UILabel* label3 = [[UILabel alloc]initWithFrame:CGRectMake(10, 170, 200, 30)];    label3.backgroundColor = [UIColor grayColor];    label3.tag = 5;    [self.view addSubview:label3];    UIStepper* step = [[UIStepper alloc]initWithFrame:CGRectMake(10, 30, 0, 0)];    [step addTarget:self action:@selector(stepAction:) forControlEvents:UIControlEventValueChanged];    step.tag = 6;    [self.view addSubview:step];    //创建点击手势    UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction:)];    //给self.view 加手势    [self.view addGestureRecognizer:tap];

调用方法：

UITextField* Txt1 = [self.view viewWithTag:2];    UITextField* Txt2 = [self.view viewWithTag:4];    UILabel* label3 = [self.view viewWithTag:5];    UIStepper* step = [self.view viewWithTag:6];    //[sender setMinimumValue:[_Txt1.text doubleValue]];    //[sender setMaximumValue:[_Txt1.text doubleValue]];    NSString* str = [NSString stringWithFormat:@"%f",step.value];    label3.text = str;    [Txt1 resignFirstResponder];    [Txt2 resignFirstResponder];