iOS-个人整理11 - UIControl与子类：UIPageControl、UIStepper

一、UIPageControl

UIPageControl就是下面的三个小白点，与UIScrollView配合可以切换视图

常用属性不多，主要是回调方法要配合UIScrollView的contentOffset属性进行页面切换

//创建UIPageControl  
    UIPageControl *pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(100, 200, 150, 60)];  
    //设置页数  
    pageControl.numberOfPages = 3;  
    //设置默认显示页  
    pageControl.currentPage = 0;  
    //设置背景色  
    pageControl.backgroundColor = [UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1];  
      
    //当前小点的颜色  
    pageControl.pageControlCurrentPageIndicatorTintColor = [UIColor redColor];  
  
    //非当前的小点颜色  
    pageControl.pageIndicatorTintColor = [UIColor whiteColor];  

    //添加方法  
    [pageControl addTarget:self action:@selector(changeViewPage:) forControlEvents:UIControlEventValueChanged];  
      
    //添加到父视图  
    [self.view addSubview:pageControl];  

具体说一下通过pageControl切换ScrollVIew

- (void)viewDidLoad {  
    [super viewDidLoad];  
    //创建scrollView  
    UIScrollView *myScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];  
    //设置滚动区域  
    myScrollView.contentSize = CGSizeMake(WIDTH*3,HEIGHT);  
    //设置tag  
    myScrollView.tag = 1000;  
      
    //给myScrollView添加三页内容  
    for (int i = 0; i<3; i++) {  
        UILabel *myLabel = [[UILabel alloc]initWithFrame:CGRectMake(WIDTH*i, 0, WIDTH, HEIGHT)];  
        myLabel.text = [NSString stringWithFormat:@"第%d页",i];  
        myLabel.font = [UIFont systemFontOfSize:100];  
        myLabel.textAlignment = NSTextAlignmentCenter;  
        myLabel.backgroundColor = [UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1];  
        [myScrollView addSubview:myLabel];  
    }  
      
    //创建UIpageController  
    UIPageControl *myPageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, 630, WIDTH, 40)];  
      
    //设置页数  
    myPageControl.numberOfPages = 3;  
      
    //设置背景色  
    myPageControl.backgroundColor = [UIColor colorWithRed:109/255.0 green:211/255.0 blue:206/255.0 alpha:1];  
      
    //给pageControl添加方法  
    [myPageControl addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged];  
      
    //添加到父视图  
    [self.view addSubview:myScrollView];  
    [self.view addSubview:myPageControl];  
      
}  
  
//实现pageControl方法  
-(void)changePage:(UIPageControl*)sender  
{  
    //根据tag得到scrollView  
    UIScrollView *myScrollView = (UIScrollView*)[self.view viewWithTag:1000];  
    //根据page的页数变换scrollView的偏移量  
    myScrollView.contentOffset = CGPointMake(WIDTH*sender.currentPage,0);  
      
}  

实现效果如下

二、UIStepper

一个加号一个减号的控件，可以当做音量加减按钮

//uiSteppear + -  
    //初始化  
    UIStepper *stepper = [[UIStepper alloc]initWithFrame:CGRectMake(10, 20, 100, 100)];  
      
    //设置数值范围  
    stepper.maximumValue = 100;  
    stepper.minimumValue = 0;  
      
    //设置每点一次的增减量  
    stepper.stepValue = 20;  
      
    //设置是否可以循环  
    stepper.wraps = YES;  
      
    //设置一直按住是否连续增加  
    stepper.autorepeat = YES;  
      
    //设置默认值  
    stepper.value = 0;  
      
    //添加方法  
    [stepper addTarget:self action:@selector(stepperAction:) forControlEvents:UIControlEventValueChanged];  
      
    //添加到父视图  
    [self.view addSubview:stepper];