[iOS]UIPageControl页面翻页循环

UIPageControl页面翻页循环

原理&＃xff1a;比如桌面上从左到右&＃xff0c;有一排10张图片&＃xff0c;我们可以把第十张图片复制一份放到第1张图片之前&＃xff0c;同时把第一张图片复制一份放置第10张图片之后。那么现在我们就有了12张图片&＃xff0c;多添加的两张图片用作移形换位之用&＃xff0c;让视觉上只能感受10张图片。

- (void)gmSectionZeroRowZero:(NSArray *)theImgArr andHight:(float)theHight {// 在传回的图片数组的对象个数基础上&＃43;2self.ymSVCycle &＃61; [theImgArr count]&＃43;2;// 为了实现循环&＃xff0c;ScrollView 的宽度也要多两个单位self.ymSoRoIV &＃61; [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, theHight)];[self.ymSoRoIV setContentSize:CGSizeMake(320*self.ymSVCycle,theHight )];// 设置ScrollView 的初始偏移[self.ymSoRoIV setContentOffset:CGPointMake(320, 0)];[self.ymSoRoIV setBounces:NO];[self.ymSoRoIV setPagingEnabled:YES];[self.view addSubview:self.ymSoRoIV]; // 设置代理[self.ymSoRoIV setDelegate:self];[self.ymCellView setFrame:CGRectMake(0, 0, 320, theHight)];for (int i &＃61; 0 ; i // self.ymPVCFirst.userInteractionEnabled &＃61; NO; } // 添加委托 [self.ymPVCFirst addTarget:selfaction:&＃64;selector(gmPVCFristAction)forControlEvents:UIControlEventTouchDown];
}#pragma mark UIScrollViewDelegate
// 任何偏移改变
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {CGPoint thePoint &＃61; [scrollView contentOffset]; if(thePoint.x / 320 &＃61;&＃61; 0){ self.ymPVCFirst.currentPage &＃61; self.ymSVCycle - 2;} else if (thePoint.x / 320 &＃61;&＃61; self.ymSVCycle - 1) { self.ymPVCFirst.currentPage &＃61; 0;} else {self.ymPVCFirst.currentPage &＃61; thePoint.x / 320 - 1; }
}- (void)scrollViewDidEndDecelerating:(UIScrollView*)scrollView { CGPoint thePoint &＃61; [scrollView contentOffset]; if (thePoint.x/320 &＃61;&＃61; self.ymSVCycle-1) { scrollView.contentOffset &＃61; CGPointMake(320, 0); self.ymPVCFirst.currentPage &＃61; 0; } else if(thePoint.x/320 &＃61;&＃61; 0) {scrollView.contentOffset &＃61; CGPointMake((self.ymSVCycle-2)*320, 0); self.ymPVCFirst.currentPage &＃61; self.ymSVCycle-2; }
}// UIPageControl关联方法
- (void)gmPVCFristAction {int page &＃61; self.ymPVCFirst.currentPage;[self.ymSoRoIVsetContentOffset:CGPointMake(320*page&＃43;320, 0)];
}