几种常用控件的使用方法

1.UIActivityIndicatorView的使用 UIActivityIndicatorView *activity=[[[UIActivityIndicatorViewalloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]autorelease];z    [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 NOsample 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];