//定义label 显示 加减条 值    label = [[UILabel alloc] initWithFrame:CGRectMake(100, 10, 100, 40)];    label.font = [UIFont boldSystemFontOfSize:30.0];    [self.view addSubview:label];    //[label release];    //加减条    UIStepper* stepper = [[UIStepper alloc] initWithFrame:CGRectMake(50, 50, 200, 50)];    //最小值    [stepper setMinimumValue:0.0];    //最大值    [stepper setMaximumValue:10.0];    //步进    [stepper setStepValue:1.0];    //value 是否 循环    [stepper setWraps:YES];    //自动加减    //[stepper setAutorepeat:YES];//按住后时候连续增长还是增长一个单位    //[stepper setContinuous:NO];//按住时是否一直变化，还是松开后再变化，变化多少取决于按住的时长    //事件    [stepper addTarget:self action:@selector(stepper:) forControlEvents:UIControlEventValueChanged];    [self.view addSubview:stepper];    [stepper release];            label.text = [NSString stringWithFormat:@"%.0lf",stepper.value];    /*//设置控制器背景图片- (void)setBackgroundImage:(UIImage*)image forState:(UIControlState)state;//获取背景图片- (UIImage*)backgroundImageForState:(UIControlState)state;//通过左右按钮的状态设置分割线的图片- (void)setDividerImage:(UIImage*)image forLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState;//获取分割线图片- (UIImage*)dividerImageForLeftSegmentState:(UIControlState)state rightSegmentState:(UIControlState)state;//设置和获取加号按钮的图片- (void)setIncrementImage:(UIImage *)image forState:(UIControlState)state;- (UIImage *)incrementImageForState:(UIControlState)state;//设置和获取减号按钮的图片- (void)setDecrementImage:(UIImage *)image forState:(UIControlState)state;- (UIImage *)decrementImageForState:(UIControlState)state;*/    ///事件 控制值- (void)stepper:(UIStepper*)stepper{    label.text = [NSString stringWithFormat:@"%.0lf",stepper.value];}