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];