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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[activity setFrame:CGRectMake(150,150, 50, 50)];

[self.window addSubview:activity];

[activity startAnimating];

2. UISlider的使用

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

slider.maximumValue=10;

slider.value=5;

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

[self.window addSubview: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];