ios – 与UIScrollView结合使用时UIPageControl不可见

概述我想使用页面控件在几个viewControllers之间切换.我有以下viewController,其关联的nib包含UIScrollView和UIPageControl.我已经通过使用 Xcode的IB将滚动视图放在页面控件上方,两个控件都是可见的,这是.h文件： @interface NewForm : UIViewController <UIScrollViewDelegate>{ 我想使用页面控件在几个vIEwControllers之间切换.我有以下vIEwController,其关联的nib包含UIScrollVIEw和UIPageControl.我已经通过使用 Xcode的IB将滚动视图放在页面控件上方,两个控件都是可见的,这是.h文件：

@interface NewForm : UIVIEwController <uiscrollviewdelegate>{   BOol pageControlUsed;}@property (nonatomic,retain) IBOutlet UIScrollVIEw *scrollVIEw;@property (nonatomic,strong) IBOutlet UIPageControl *pageControl;@property (nonatomic,retain) NSMutableArray *vIEwControllers;- (IBAction)changePage:(ID)sender;@end

视图和scrollVIEw插座链接到file的所有者,以及滚动视图的委托. pageControl outlet和changePage链接到UIPageControl.

这是.m文件(实际上只是相关的方法)：

@implementation STNewAccountTest@synthesize scrollVIEw,vIEwControllers,pageControl;- (voID)vIEwDIDLoad{  [super vIEwDIDLoad];  NSMutableArray *controllers = [[NSMutableArray alloc] init]; [controllers addobject:[[Page1 alloc] initWithNibname:@"Page1" bundle:nil]]; [controllers addobject:[[Page2 alloc] initWithNibname:@"Page2" bundle:nil]]; self.vIEwControllers = controllers; scrollVIEw.pagingEnabled = YES; scrollVIEw.contentSize = CGSizeMake(scrollVIEw.frame.size.wIDth * numberOfPages,scrollVIEw.frame.size.height); scrollVIEw.showsHorizontalScrollindicator = NO; scrollVIEw.showsverticalScrollindicator = NO; scrollVIEw.scrollsTotop = NO; scrollVIEw.delegate = self; self.pageControl.currentPage = 0; self.pageControl.numberOfPages = numberOfPages; [self loadScrollVIEwWithPage:0];}- (voID)loadScrollVIEwWithPage:(int)page{  if ((page < 0) || (page >= numberOfPages))    return;  Page1 *controller1 = nil;  Page2 *controller2 = nil;  if (page == 0) {    controller = [self.vIEwControllers objectAtIndex:page];    if (controller == nil) {        controller = [[Page1 alloc] initWithNibname:@"Page1" bundle:nil];        [self.vIEwControllers replaceObjectAtIndex:page withObject:controller];    }}if (page == 1) {    controller = [self.vIEwControllers objectAtIndex:page];    if (controller == nil) {        controller = [[Page2 alloc] initWithNibname:@"Page2" bundle:nil];        [self.vIEwControllers replaceObjectAtIndex:page withObject:controller];    }}if (controller.vIEw.supervIEw == nil){    CGRect frame = self.scrollVIEw.frame;     frame.origin.x = frame.size.wIDth * page;     frame.origin.y = 0;     controller.vIEw.frame = frame;    [self.scrollVIEw addSubvIEw:controller.vIEw];}}- (voID)scrollVIEwDIDScroll:(UIScrollVIEw *)sender{  if (pageControlUsed)  {    return;  }  // Switch the indicator when more than 50% of the prevIoUs/next page is visible  CGfloat pageWIDth = scrollVIEw.frame.size.wIDth;  int page = floor((scrollVIEw.contentOffset.x - pageWIDth / 2) / pageWIDth) + 1;  pageControl.currentPage = page;  // load the visible page and the page on either sIDe of it (to avoID flashes when the user starts scrolling)  [self loadScrollVIEwWithPage:page - 1];  [self loadScrollVIEwWithPage:page];  [self loadScrollVIEwWithPage:page + 1];}- (voID)scrollVIEwWillBeginDragging:(UIScrollVIEw *)scrollVIEw{  pageControlUsed = NO;}- (voID)scrollVIEwDIDEndDecelerating:(UIScrollVIEw *)scrollVIEw{  pageControlUsed = NO;}- (IBAction)changePage:(ID)sender{  int page = pageControl.currentPage;  // load the visible page and the page on either sIDe of it (to avoID flashes when the user starts scrolling)  [self loadScrollVIEwWithPage:page - 1];  [self loadScrollVIEwWithPage:page];  [self loadScrollVIEwWithPage:page + 1];// update the scroll vIEw to the appropriate page  CGRect frame = scrollVIEw.frame;  frame.origin.x = frame.size.wIDth * page;  frame.origin.y = 0;  [scrollVIEw scrollRectToVisible:frame animated:YES];// Set the boolean used when scrolls originate from the UIPageControl  pageControlUsed = YES;}

当我运行应用程序时,我看到的是页面的视图占据了整个屏幕,我能够通过滚动视图的分页功能浏览页面,但页面控件及其点不会显示.我能错过什么？

谢谢！

解决方法 这里回答： https://stackoverflow.com/a/4245642/1455770

“如果页面控件和容器的背景颜色相同(默认为白色),则页面控件将不可见.”

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