几种常用控件的使用方法

1.UIActivityIndicatorView的使用

 UIActivityIndicatorView *activity=[[[UIActivityIndicatorViewalloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]autorelease];

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    [activitysetFrame:CGRectMake(150,150,50, 50)];

    [self.windowaddSubview:activity];    

    [activitystartAnimating];

2. UISlider的使用

    UISlider *slider=[[[UISlideralloc]initWithFrame:CGRectMake(100,20,140,20)]autorelease];

    slider.maximumValue=10;

    slider.value=5;

    [slideraddTarget:selfaction:@selector(change:)forControlEvents:UIControlEventTouchUpInside];

    [self.windowaddSubview:slider];

-(void)change:(UISlider*)slider

{

   NSLog(@"the val is %.2f",slider.value);

}

3.UIPageControl

通常与UIScrollView连用，提示用户当前显示的页数

@property(nonatomic)NSInteger numberOfPages;          // default is 0

@property(nonatomic)NSInteger currentPage;           // default is 0. value pinned to 0..numberOfPages-1

@property(nonatomic)BOOL hidesForSinglePage;         // hide the the indicator if there is only one page. default is NO

sample code:

 UIPageControl *pageControl=[[[UIPageControl alloc] initWithFrame:CGRectMake(0, 50, 329, 30)] autorelease];    pageControl.numberOfPages=10;    pageControl.currentPage=3;    pageControl.backgroundColor=[UIColor grayColor];    [pageControl addTarget:self action:@selector(clicked:) forControlEvents:UIControlEventValueChanged];    [self.window addSubview:pageControl];-(void)clicked:(id)sender{    UIPageControl *pageControl=(UIPageControl*)sender;    NSLog(@"curent val is %d",pageControl.currentPage);}

4.UISegmentedControl

  NSArray *array=[NSArray arrayWithObjects:@"hello",@"what",@"search",nil];    UISegmentedControl *segmentControl=[[[UISegmentedControl alloc] initWithItems:array] autorelease];    segmentControl.frame=CGRectMake(0, 40, 300, 40);    segmentControl.segmentedControlStyle=UISegmentedControlStyleBordered;    segmentControl.selectedSegmentIndex=2;    [segmentControl addTarget:self action:@selector(clicked:) forControlEvents:UIControlEventValueChanged];    [self.window addSubview:segmentControl];