Iphone ScrollView:PageControl点不随页面变化
我编写了一个iPhone应用程序,其中包含一个TableView和一个detailView,其中包含一个ScrollView和两个页面,两个页面都包含一个图像和一个显示两个白点的页面控件 它似乎工作得很好。视图向左滚动,显示下一页,除了滚动视图下的小白点PageControl点外,其他都是它应该显示的。 如果我按下小点:页面滚动,第二个点突出显示!。但是如果我用拇指手动滑动第一页到下一页,白点不会随之改变。它应该突出显示第二个点 希望有人能帮助我。我已经把代码读了10遍,并搜索了所有我能找到的示例代码 这是我的密码:Iphone ScrollView:PageControl点不随页面变化,iphone,xcode,uiscrollview,uipagecontrol,Iphone,Xcode,Uiscrollview,Uipagecontrol,我编写了一个iPhone应用程序,其中包含一个TableView和一个detailView,其中包含一个ScrollView和两个页面,两个页面都包含一个图像和一个显示两个白点的页面控件 它似乎工作得很好。视图向左滚动,显示下一页,除了滚动视图下的小白点PageControl点外,其他都是它应该显示的。 如果我按下小点:页面滚动,第二个点突出显示!。但是如果我用拇指手动滑动第一页到下一页,白点不会随之改变。它应该突出显示第二个点 希望有人能帮助我。我已经把代码读了10遍,并搜索了所有我能找到的示
#import <UIKit/UIKit.h>
@interface DetailViewController : UIViewController
<UIScrollViewDelegate>
{
NSString *selectedImage1;
NSString *selectedImage2;
NSNumber *selectedNpages;
IBOutlet UIScrollView* scrollView;
IBOutlet UIPageControl* pageControl;
BOOL pageControlIsChangingPage;
}
@property (nonatomic, retain) NSString *selectedImage1;
@property (nonatomic, retain) NSString *selectedImage2;
@property (nonatomic, retain) NSNumber *selectedNpages;
@property (nonatomic, retain) UIView *scrollView;
@property (nonatomic, retain) UIPageControl* pageControl;
-(IBAction)changePage:(id)sender;
-(void)setupPage;
@end
#import "DetailViewController.h"
@implementation DetailViewController
@synthesize selectedImage1;
@synthesize selectedImage2;
@synthesize selectedNpages;
@synthesize scrollView;
@synthesize pageControl;
#pragma mark -
#pragma mark UIView boilerplate
- (void)viewDidLoad
{
[self setupPage];
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)viewDidUnload
{
[scrollView release];
[pageControl release];
}
#pragma mark -
#pragma mark The Guts
- (void)setupPage
{
scrollView.scrollsToTop = NO;
scrollView.delegate = self;
scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView.clipsToBounds = YES;
scrollView.scrollEnabled = YES;
scrollView.pagingEnabled = YES;
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.showsVerticalScrollIndicator = NO;
[scrollView setCanCancelContentTouches:NO];
pageControl.currentPage = 0;
NSString *image1a = selectedImage1;
NSString *image2a = selectedImage2;
CGFloat cx = 0;
//FIRST PAGE
// Image
UIImage *bimage = [UIImage imageWithContentsOfFile: [[NSBundle mainBundle] pathForResource:image1a ofType:@"jpg"]];
UIImageView *bimageView = [[UIImageView alloc] initWithImage:bimage];
CGRect brect = bimageView.frame;
brect.size.height = bimage.size.height;
brect.size.width = bimage.size.width;
brect.origin.x = ((scrollView.frame.size.width - bimage.size.width) / 2) + cx;
brect.origin.y = ((scrollView.frame.size.height - bimage.size.height) / 2);
bimageView.frame = brect;
[scrollView addSubview:bimageView];
[bimageView release];
cx += scrollView.frame.size.width;
//SECOND PAGE
if([selectedNpages intValue] == 2)
{
//Image
UIImage *bimage2 = [UIImage imageWithContentsOfFile: [[NSBundle mainBundle] pathForResource:image2a ofType:@"jpg"]];
UIImageView *bimage2View = [[UIImageView alloc] initWithImage:bimage2];
UIImageView *bimageView2 = [[UIImageView alloc] initWithImage:bimage2];
CGRect brect2 = bimageView2.frame;
brect2.size.height = bimage2.size.height;
brect2.size.width = bimage2.size.width;
brect2.origin.x = ((scrollView.frame.size.width - bimage2.size.width) / 2) + cx;
brect2.origin.y = ((scrollView.frame.size.height - bimage2.size.height) / 2);
bimageView2.frame = brect2;
[scrollView addSubview:bimageView2];
[bimageView2 release];
cx += scrollView.frame.size.width;
}
self.pageControl.numberOfPages = [selectedNpages intValue];
[scrollView setContentSize:CGSizeMake(cx, [scrollView bounds].size.height)];
[image1a release];
[image2a release];
}
#pragma mark -
#pragma mark UIScrollViewDelegate stuff
- (void)ScrollViewDidScroll:(UIScrollView *)_scrollView
{
if (pageControlIsChangingPage) {
return;
}
CGFloat pageWidth = _scrollView.frame.size.width;
int page = floor((_scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = page;
}
- (void)ScrollViewDidEndDecelerating:(UIScrollView *)_scrollView
{
pageControlIsChangingPage = NO;
}
#pragma mark -
#pragma mark PageControl stuff
- (IBAction)changePage:(id)sender
{
CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * pageControl.currentPage;
frame.origin.y = 0;
[scrollView scrollRectToVisible:frame animated:YES];
pageControlIsChangingPage = YES;
}
- (void)dealloc {
[DetailViewController release];
[selectedImage1 release];
[selectedImage2 release];
[selectedImage2 release];
[selectedNpages release];
[super dealloc];
}
@end
感谢您花时间阅读此内容。ScrollViewDidScroll:应以小写S开头,如ScrollViewDidScroll:。这同样适用于ScrollViewDiEndDecelling:
在Objective-C中,应该始终以小写字符开始方法。大写字母是为类名、常量(可能是全局变量)保留的。方法-永远不要 ScrollViewDidScroll:应以小写S开头,如以下ScrollViewDidScroll:。这同样适用于ScrollViewDiEndDecelling:
在Objective-C中,应该始终以小写字符开始方法。大写字母是为类名、常量(可能是全局变量)保留的。方法-永远不要 如果Michal的答案无法解决问题,请尝试以下方法:
Interface Builder中的pageControl IBOutlet是否连接到您的类?如果未连接,则为pageControl.currentPage=page;in-voidscrollViewDidScroll:UIScrollView*\u scrollView不会更改所选点。如果Michal的答案无法解决问题,请尝试以下操作:
Interface Builder中的pageControl IBOutlet是否连接到您的类?如果未连接,则为pageControl.currentPage=page;in-voidscrollViewDidScroll:UIScrollView*\u scrollView不会更改所选的点。这也是我的第一个假设,但出口必须正确设置,因为Mike编写的changePage:works-它依赖于寻呼机的出口。TouchéMichal;当我浏览这个方法时,我认为它使用的是发送方而不是出口。这也是我的第一个假设,但出口必须正确设置,因为迈克写的changePage:works-它依赖于寻呼机的出口。TouchéMichal;当我浏览这个方法时,我认为它使用的是发送者而不是出口。