ios菜鳥之路:uiscrollview和pagecontrol的使用方法
一、UIScrollview以及pagecontrol的宣告
@interface rootViewController : UIViewController<UIScrollViewDelegate>//加上scrollviewdelegate的協議
@property (strong, nonatomic) IBOutlet UIScrollView *scrollView;
@property (strong, nonatomic) IBOutlet UIPageControl *pageControl;
- (IBAction)pageTurn:(UIPageControl *)sender; //pagecontrol的介面轉換方法
二、實現
[scrollView setContentSize:CGSizeMake(960, 380)];//設定scrollview畫布的大小,此設定為三頁的寬度,380的高度。用來實現三頁照片的轉換。
scrollView.pagingEnabled=YES;//立刻翻頁到下一頁 沒中間的拖動過程
scrollView.bounces=NO;//去掉翻頁中的白屏
[scrollView setDelegate:self];
scrollView.showsHorizontalScrollIndicator=NO;//不現實水平滾動條
//將影象新增到scrollview中
UIImageView *imageview1=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 320, 380)];
[imageview1 setImage:[UIImage imageNamed:@"Default1.png"]];
UIImageView *imageview2=[[UIImageView alloc]initWithFrame:CGRectMake(320, 0, 320, 380)];
[imageview2 setImage:[UIImage imageNamed:@"Default2.png"]];
UIImageView *imageview3=[[UIImageView alloc]initWithFrame:CGRectMake(640, 0, 320, 380)];
[imageview3 setImage:[UIImage imageNamed:@"Default3.png"]];
[scrollView addSubview:imageview1];
[scrollView addSubview:imageview2];
[scrollView addSubview: imageview3];
[self.view addSubview:scrollView];
//將pagecontrol新增到scrollview中
pageControl=[[UIPageControl alloc]initWithFrame:CGRectMake(0, 350, 320, 30)];
pageControl.numberOfPages=3;
pageControl.currentPage=0;
[pageControl addTarget:self action:@selector(pageTurn:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:pageControl];
//pagecontrol的點跟著頁數改變
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView1{
CGPoint offset=scrollView1.contentOffset;
CGRect bounds=scrollView1.frame;
[pageControl setCurrentPage:offset.x/bounds.size.width];
}
//點選pagecontrol的點 跳到那一頁的實現
- (IBAction)pageTurn:(UIPageControl *)sender {
CGSize viewsize=scrollView.frame.size;
CGRect rect=CGRectMake(sender.currentPage*viewsize.width, 0, viewsize.width, viewsize.height);
[scrollView scrollRectToVisible:rect animated:YES];
}
以上內容只是多張圖片的轉換功能。scrollview是將一屏放不了的東西組織在一起的功能,在相簿和地圖中比較常見。