我很难做到这一点。
我有一个启用了分页的 UIScrollView。它由 View Controller (MainViewController) 管理,每个页面由 PageViewController 管理,其 View 作为 scrollView 的 subview 添加到适当的偏移量。左右滚动,适用于标准方向的 iPhone 应用程序。效果很好。基本上和 Apple 提供的示例一模一样,也和 iPhone 自带的 Weather 应用一模一样。
但是,当我尝试支持其他方向时,效果并不理想。我使用此方法支持 MainViewController 和 PageViewController 中的每个方向:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
然而,当我旋转设备时,我的页面变得非常倾斜,并且有很多绘图故障,特别是如果只加载了一些页面,然后我旋转,然后滚动更多,等等......非常困惑.
我已经告诉我的观点来支持自动调整大小
theView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
但是没有用。它似乎只是在延伸和扭曲我的观点。
在我的 MainViewController 中,我添加了这一行以尝试调整我所有页面 View 的大小:
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * ([self.viewControllers count]), self.scrollView.frame.size.height);
for (int i = 0; i < [self.viewControllers count]; i++) {
PageViewController *controller = [self.viewControllers objectAtIndex:i];
if ((NSNull *)controller == [NSNull null])
continue;
NSLog(@"Changing frame: %d", i);
CGRect frame = self.scrollView.frame;
frame.origin.x = frame.size.width * i;
frame.origin.y = 0;
controller.view.frame = frame;
}
}
但这并没有太大帮助(因为我懒加载 View ,所以执行时不一定加载所有 View )。
有什么办法可以解决这个问题吗?
最佳答案
我已经使用以下方法成功实现了这一点:
.h文件代码:
@interface ScrollViewController2 : UIViewController <UIWebViewDelegate, UIScrollViewDelegate> {
NSMutableArray *views;
int currentPage;
IBOutlet UIScrollView *scrollView;
BOOL bolPageControlUsed;
int intCurrIndex;
NSMutableArray *arrayContentData;
NSMutableArray *viewControllers;
}
@property (nonatomic, retain) IBOutlet UIScrollView *scrollView;
@property (nonatomic, retain) NSMutableArray *arrayContentData;
@property (nonatomic, retain) NSMutableArray *viewControllers;
@property (nonatomic) BOOL bolPageControlUsed;
@property (nonatomic) int intCurrIndex;
-(void)bindPages;
- (void)setUpScrollView;
- (void)alignSubviews;
- (NSURLRequest *)getPageFromDocumentsDirectory:(NSString *)pstrPageName;
-(void)initiateScrollView;
-(void)loadScrollViewWithPage:(int)page;
============================================= =============================================
.m文件
@synthesize ScrollView ;
@synthesize arrayContentData, viewControllers, bolPageControlUsed, intCurrIndex;
- (void)viewDidLoad {
[super viewDidLoad];
[self bindPages];
//[self setUpScrollView];
[self initiateScrollView];
}
#pragma mark -
#pragma mark Bind Pages
-(void)bindPages{
self.arrayContentData = [[NSMutableArray alloc] init];
[self.arrayContentData addObject:@"1.html"];
[self.arrayContentData addObject:@"2.html"];
[self.arrayContentData addObject:@"3.html"];
[self.arrayContentData addObject:@"4.html"];
[self.arrayContentData addObject:@"5.html"];
[self.arrayContentData addObject:@"6.html"];
[self.arrayContentData addObject:@"1.html"];
[self.arrayContentData addObject:@"2.html"];
[self.arrayContentData addObject:@"3.html"];
[self.arrayContentData addObject:@"4.html"];
[self.arrayContentData addObject:@"5.html"];
[self.arrayContentData addObject:@"6.html"];
[self.arrayContentData addObject:@"1.html"];
[self.arrayContentData addObject:@"2.html"];
[self.arrayContentData addObject:@"3.html"];
[self.arrayContentData addObject:@"4.html"];
[self.arrayContentData addObject:@"5.html"];
[self.arrayContentData addObject:@"6.html"];
[self.arrayContentData addObject:@"1.html"];
[self.arrayContentData addObject:@"2.html"];
[self.arrayContentData addObject:@"3.html"];
[self.arrayContentData addObject:@"4.html"];
[self.arrayContentData addObject:@"5.html"];
[self.arrayContentData addObject:@"6.html"];
}
#pragma mark -
#pragma mark Get Filename from Document Directory
- (NSURLRequest *)getPageFromDocumentsDirectory:(NSString *)pstrPageName {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [paths objectAtIndex:0];
NSString *yourFilePath = [NSString stringWithFormat:@"%@/Html/%@", documentDirectory, pstrPageName];
NSURL *url = [NSURL fileURLWithPath:yourFilePath];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
return requestObj;
}
#pragma mark -
#pragma mark ScrollView Methods
-(void)initiateScrollView{
views = [[NSMutableArray alloc] initWithCapacity:[self.arrayContentData count]];
NSMutableArray *controllers = [[NSMutableArray alloc] init];
for (unsigned i = 0; i < [self.arrayContentData count]; i++) {
[controllers addObject:[NSNull null]];
}
self.viewControllers = controllers;
[controllers release];
scrollView.contentSize = CGSizeMake([self.arrayContentData count]*scrollView.bounds.size.width,
scrollView.bounds.size.height);
scrollView.delegate = self;
if(self.intCurrIndex == 0){
[self loadScrollViewWithPage:self.intCurrIndex];
}
}
-(void)loadScrollViewWithPage:(int)page{
if (page < 0) return;
if (page >= [self.arrayContentData count]) return;
// replace the placeholder if necessary
NSString *strContentName = [self.arrayContentData objectAtIndex:page];
//UIImageView *controller = [viewControllers objectAtIndex:page];
UIWebView *controller = [viewControllers objectAtIndex:page];
if ((NSNull *)controller == [NSNull null]) {
UIView *v = [[UIView alloc] initWithFrame:scrollView.bounds];
v.backgroundColor = [UIColor colorWithHue:arc4random()/(float)0x100000000
saturation:0.75
brightness:1.0
alpha:1.0];
controller = [[UIWebView alloc] initWithFrame:v.bounds];
controller.delegate = self;
controller.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
controller.center = CGPointMake(v.bounds.size.width/2, v.bounds.size.height/2);
[controller loadRequest:[self getPageFromDocumentsDirectory:strContentName]];
[v addSubview:controller];
[controller release];
[scrollView addSubview:v];
[views addObject:v];
[viewControllers replaceObjectAtIndex:page withObject:controller];
[v release];
}
[self alignSubviews];
/*
// add the controller's view to the scroll view
if (nil == controller.superview) {
CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * page;
//frame.origin.y = 0;
controller.frame = frame;
[scrollView addSubview:controller];
}*/
}
-(void)scrollViewDidScroll:(UIScrollView *)sender{
// We don't want a "feedback loop" between the UIPageControl and the scroll delegate in
// which a scroll event generated from the user hitting the page control triggers updates from
// the delegate method. We use a boolean to disable the delegate logic when the page control is used.
if (self.bolPageControlUsed) {
// do nothing - the scroll was initiated from the page control, not the user dragging
return;
}
// Switch the indicator when more than 50% of the previous/next page is visible
currentPage = scrollView.contentOffset.x / scrollView.bounds.size.width;
[self loadScrollViewWithPage:currentPage];
}
//在滚动动画结束时,重置滚动源自 UIPageControl 时使用的 bool 值 -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { self.bolPageControlUsed = NO;
#pragma mark -
#pragma mark setUp ScrollView
- (void)setUpScrollView {
// Set up some colorful content views
views = [[NSMutableArray alloc] initWithCapacity:[self.arrayContentData count]];
for (int i = 0; i < [self.arrayContentData count]; i++) {
UIView *v = [[UIView alloc] initWithFrame:scrollView.bounds];
v.backgroundColor = [UIColor colorWithHue:arc4random()/(float)0x100000000
saturation:0.75
brightness:1.0
alpha:1.0];
NSString *strContentName = [self.arrayContentData objectAtIndex:i];
UIWebView *controller = [[UIWebView alloc] initWithFrame:v.bounds];
controller.delegate = self;
controller.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
controller.center = CGPointMake(v.bounds.size.width/2, v.bounds.size.height/2);
[controller loadRequest:[self getPageFromDocumentsDirectory:strContentName]];
[v addSubview:controller];
[controller release];
[scrollView addSubview:v];
[views addObject:v];
[v release];
}
[self alignSubviews];
[scrollView flashScrollIndicators];
}
#pragma mark -
#pragma mark Align Scroll Subviews
- (void)alignSubviews {
// Position all the content views at their respective page positions
scrollView.contentSize = CGSizeMake([self.arrayContentData count]*scrollView.bounds.size.width,
scrollView.bounds.size.height);
NSUInteger i = 0;
for (UIView *v in views) {
v.frame = CGRectMake(i * scrollView.bounds.size.width, 0,
scrollView.bounds.size.width, scrollView.bounds.size.height);
for (UIWebView *w in v.subviews) {
[w setFrame:v.bounds];
}
i++;
}
}
#pragma mark -
#pragma mark UIWebView delegate
- (void)webViewDidStartLoad:(UIWebView *)webView {
}
- (void)webViewDidFinishLoad:(UIWebView *)webView {
}
#pragma mark -
#pragma mark Orientation
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return YES;
}
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
duration:(NSTimeInterval)duration {
currentPage = scrollView.contentOffset.x / scrollView.bounds.size.width;
}
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
duration:(NSTimeInterval)duration {
[self alignSubviews];
//NSLog(@"%f", currentPage * scrollView.bounds.size.width);
scrollView.contentOffset = CGPointMake(currentPage * scrollView.bounds.size.width, 0);
}
希望对大家有所帮助。
干杯。
关于objective-c - 启用页面和设备旋转/方向更改的 UIScrollView (MADNESS),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2525290/