iPhone 上实现页面循环滚动

核心提示：if(x < minStart){nx = x + perWidth ;}if(x >maxStart){nx = x - perWidth;}CGRect rcVisable;rcVisable.origin.x = nx;rcVisable.origin.y = 0;rcVisable.size = s

if(x < minStart)

{

nx = x + perWidth ;

}

if(x >maxStart)

{

nx = x - perWidth;

}

CGRect rcVisable;

rcVisable.origin.x = nx;

rcVisable.origin.y = 0;

rcVisable.size = self.frame.size;

self.contentOffset = rcVisable.origin;

//第二步 整理里面元素的位置 scrollView下面的视图偏移 (有两个 scrollView 自带的视图，排除 )

//整理

NSArray* ary = [self subviews];

int arySize = [ary count];

NSMutableArray* aryOrderd = nil;//从 ary 里面的视图取出，按照当前 scrollview上从左到右再排序

if(arySize > 0 )

{

aryOrderd = [[NSMutableArray alloc] initWithCapacity:0];

}

if(aryOrderd != nil)

{

int i = 0;

//初开始化数组

for(i=0;i< p>

{

UIView* pView = [ary objectAtIndex:i];

// 0x12345691 这个是我在增加 pView 到 scrollview 前给 pView 做的标记。用来区分 scrollview 内部的 view

if(pView.hidden == NO && 0x12345691 == pView.tag)

{

[aryOrderd addObject:pView];

// NSLog(@"初开始化数组 把pView=%d加入 %d ",pView, i);

// NSLog(@"pView.center.x=%f ",pView.center.x);

}

}

int aryOrdredSize = [aryOrderd count];

NSArray* aryTemp = [[NSArray alloc] initWithArray:aryOrderd];

//排序

for(i=0;i< p>

{

UIView* pView = [aryTemp objectAtIndex:i];

CGRect rccc = pView.frame;

float centerX = CGRectGetMidX(rccc);

int pageIndex = ceil(centerX/perWidth);

if(pView.hidden == NO && 0x12345691 == pView.tag)

{

if( pageIndex <= 0 || pageIndex > aryOrdredSize )