iOS第五章控件和动作(4)

UIView *mainView = [[[[mySwitch subviews]objectAtIndex:0] subviews] objectAtIndex:2];

UILabel *onLabel = [[mainView subviews]objectAtIndex:0];

UILabel *offLabel = [[mainView subviews]objectAtIndex:1];

修改字体和颜色

onLabel.text       = @"YES";

offLabel.text      = @"NO";

onLabel.textColor  = [UIColor yellowColor];

offLabel.textColor = [UIColor greenColor];

7、控制控件-滑块 UISlider

创建  

CGRect sliderRect = CGRectMake(20,50,280,40);

UISlider *mySlider = [[UISlider alloc]initWithFrame: sliderRect]; 

mySlider.minimumValue = 0; 

mySlider.maximumValue = 100; 

mySlider.continuous   = YES; 

……

处理滑动事件

-(void)sliderAction:(id)sender 

{ 

    intstepAmount  = 10; 

    floatstepValue = (abs([(UISlider *)sender value]) / stepAmount) * stepAmount; 

    [sendersetValue: stepValue];  

    lblSliderValue.text= [NSString stringWithFormat: @"%d", (int)stepValue]; 

}