Objective c 启用页面并更改设备旋转/方向的UIScrollView（疯狂）

我很难做到这一点

我有一个UIScrollView，启用了分页。它由一个视图控制器（MainViewController）管理，每个页面由一个PageViewController管理，它的视图作为scrollView的子视图以适当的偏移量添加。滚动是左右滚动，用于标准方向的iPhone应用程序。效果很好。基本上与苹果提供的示例完全相同，也与iPhone提供的天气应用程序完全相同

然而，当我试图支持其他方向时，事情并不是很好。我使用以下方法支持MainViewController和PageViewController中的每个方向：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
     return YES;
}

但是，当我旋转设备时，我的页面会变得非常倾斜，并且会出现很多绘图问题，特别是如果只加载了部分页面，那么我会旋转，然后滚动更多，等等。。。很乱

我已经告诉我的视图支持使用自动调整大小

 theView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

但是没有用。它似乎只是延伸和扭曲了我的观点

在我的MainViewController中，我添加了这一行，试图调整我所有页面的视图大小：

- (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;
    }
}

-（void）从InterfaceOrientation（接口方向）中删除了RotateFromInterfaceOrientation：（UIInterfaceOrientation）{
self.scrollView.contentSize=CGSizeMake（self.scrollView.frame.size.width*（[self.viewControllers count]），self.scrollView.frame.size.height）；
对于（int i=0；i<[self.viewControllers count]；i++）{
PageViewController*controller=[self.viewController对象索引：i]；
如果（（NSNull*）控制器==[NSNull]）
继续；
NSLog（@“更改帧：%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（因为我懒散地加载视图，所以在执行时并不一定加载所有视图）

---

有什么办法解决这个问题吗？

我不太确定我是否完全理解你的意思。。然而，一些想法：

frame属性是一件事（A），视图内容在其中的显示方式是另一件事（B）。帧CGRect是superview（父视图）中视图的（理论）边界。。但是，视图不一定需要填充整个帧区域

关于（A）项： 这里我们有UIView的

autoresizingMask

属性来设置调整superview大小时如何调整帧大小。当你改变方向时会发生这种情况。但是，您通常可以依赖默认设置（到目前为止对我有效）

关于（B）： 视图内容在图幅中的分布方式由UIView的属性

contentMode

指定。使用此属性，可以设置纵横比需要保持不变。例如，将其设置为

UIViewContentModeScaleAspectFit

或其他

请看这里：

---

PS：我写了“理论”，因为您的视图内容也可能超出这些帧边界-它们仅在UIView的clipsToBounds属性设置为“是”时限制视图。我认为苹果默认设置为“否”是一个错误。

除了Efrain所写的，请注意，如果视图变换不是标识变换，即视图旋转时，frame属性无效

---

当然，您考虑了视图需要位于新的偏移位置这一事实，对吗？

是否需要为UIScrollView中的每个页面使用单独的UIViewController（PageViewController）？为什么不让MainViewController处理这个问题呢

---

在Interface Builder中构建UI时，旋转设备后调整视图（以及用户界面）的大小要容易得多。

我使用以下方法成功地实现了这一点：

.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;

@界面滚动视图控制器2:UIViewController{
NSMutableArray*视图；
int当前页面；
IBUIScrollView*滚动视图；
使用布尔布尔函数；
国际货币指数；
NSMutableArray*arrayContentData；
NSMutableArray*视图控制器；
}
@属性（非原子，保留）IBMOutlet UIScrollView*scrollView；
@属性（非原子，保留）NSMutableArray*arrayContentData；
@属性（非原子，保留）NSMUTABLEARRY*viewControllers；
@使用的属性（非原子）BOOL bolpagecontrol；
@属性（非原子）intCurrIndex；
-（作废）活页夹；
-（无效）设置滚动视图；
-（无效）对齐子视图；
-（NSURLRequest*）getPageFromDocumentsDirectory:（NSString*）pstrPageName；
-（void）initiateScrollView；
-（void）加载滚动视图带页面：（int）页面；

============================================================================================

.m文件 @综合滚动视图

@合成arrayContentData、ViewController、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];
}

-（void）viewDidLoad{
[超级视图下载]；
[自动装订页]；
//[自设置滚动视图]；
[自启动滚动视图]；
}
#布拉格标记-
#pragma标记绑定页
-（作废）活页夹{
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 addObje]
#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);
}