iPhone开发应用中UIScrollView代码实现循环滚动

iPhone开发应用中循环滚动一个UIScrollView代码实现是本文要介绍的内容，主要是介绍UIScrollView来实现循环滚动的案例，来看详细内容。

//  testScrollViewViewController.m   
//  testScrollView   
//  Created by cash on 11-7-4.   
//  Copyright 2011年 xbiii3s@gmail.com. All rights reserved.    
#import "testScrollViewViewController.h"   
@implementation testScrollViewViewController    
@synthesize scrollView, slideImages;   
#define WIDTH_OF_SCROLL_PAGE 320   
#define HEIGHT_OF_SCROLL_PAGE 460   
#define WIDTH_OF_IMAGE 320 #define HEIGHT_OF_IMAGE 460   
#define LEFT_EDGE_OFSET 0    
- (void)viewDidLoad {       
    scrollView = [[UIScrollView alloc] init];   
    CGRect scrollFrame;   
    scrollFrame.origin.x = 0;       
    scrollFrame.origin.y = 0;         
    scrollFrame.size.width = WIDTH_OF_SCROLL_PAGE;       
    scrollFrame.size.height = HEIGHT_OF_SCROLL_PAGE;       
    scrollView = [[UIScrollView alloc] initWithFrame:scrollFrame];       
    scrollView.bounces = YES;       
    scrollView.pagingEnabled = YES;       
    scrollView.delegate = self;       
    scrollView.userInteractionEnabled = YES;       
    slideImages = [[NSMutableArray alloc] init];       
    [slideImages addObject:@"IMG_0116.PNG"];       
    [slideImages addObject:@"IMG_0118.PNG"];       
    [slideImages addObject:@"IMG_0119.PNG"];       
    [slideImages addObject:@"main_bg.png"];       
     //add the last image first        
     UIImageView *imageView = [[UIImageView alloc]   
     initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:([slideImages count]-1)]]]        
     imageView.frame = CGRectMake(LEFT_EDGE_OFSET, 0, WIDTH_OF_IMAGE, HEIGHT_OF_IMAGE);       
     [scrollView addSubview:imageView];       
     [imageView release];      
     for (int i = 0;i<[slideImages count];i++) {    
            //loop this bit           
            UIImageView *imageView = [[UIImageView alloc]   
            initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:i]]];           
            imageView.frame = CGRectMake((WIDTH_OF_IMAGE * i) + LEFT_EDGE_OFSET + 320, 0, WIDTH_OF_IMAGE, HEIGHT_OF_IMAGE);           
            [scrollView addSubview:imageView];           
            [imageView release];   
      }       
       //add the first image at the end       
       imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:0]]];       
       imageView.frame = CGRectMake((WIDTH_OF_IMAGE * ([slideImages count] + 1)) + LEFT_EDGE_OFSET, 0, WIDTH_OF_IMAGE, HEIGHT_OF_IMAGE);   
        [scrollView addSubview:imageView];      
        [imageView release];       
        [scrollView setContentSize:CGSizeMake(WIDTH_OF_SCROLL_PAGE * ([slideImages count] + 2), HEIGHT_OF_IMAGE)];      
         [scrollView setContentOffset:CGPointMake(0, 0)];       
         [self.view addSubview:scrollView];      
          [self.scrollView scrollRectToVisible:CGRectMake(WIDTH_OF_IMAGE,0,WIDTH_OF_IMAGE,HEIGHT_OF_IMAGE) animated:NO];        
          [super viewDidLoad];} - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {    
      int currentPage = floor((self.scrollView.contentOffset.x - self.scrollView.frame.size.width 
                              / ([slideImages count]+2)) / self.scrollView.frame.size.width) + 1;      
       if (currentPage==0) {    
              //go last but 1 page           
   [self.scrollView scrollRectToVisible:CGRectMake(WIDTH_OF_IMAGE * [slideImages count],0,WIDTH_OF_IMAGE,HEIGHT_OF_IMAGE) animated:NO];   
 } else   
 if (currentPage==([slideImages count]+1)) {   
 //如果是最后+1,也就是要开始循环的第一个           
 [self.scrollView scrollRectToVisible:CGRectMake(WIDTH_OF_IMAGE,0,WIDTH_OF_IMAGE,HEIGHT_OF_IMAGE) animated:NO];   
}   
}   
- (void)didReceiveMemoryWarning {     
  // Releases the view if it doesn't have a superview.       
  [super didReceiveMemoryWarning];       
  // Release any cached data, images, etc that aren't in use.   
  }   
 - (void)viewDidUnload {     
   // Release any retained subviews of the main view.      
    // e.g. self.myOutlet = nil;   
 }    
 - (void)dealloc {      
  [scrollView release];       
  [slideImages release];       
  [super dealloc];  
}  
@end 

小结：iPhone开发应用中循环滚动一个UIScrollView代码实现的内容介绍完了，希望通过本文的学习能对你有所帮助！