【发布时间】:2010-03-17 03:51:53
【问题描述】:
我正在构建一个漫画查看器应用程序,它由两个视图控制器组成,根视图控制器基本上显示一个视图,用户可以通过按下按钮来决定他们想要阅读的漫画。第二个 viewController 实际上将漫画显示为带有工具栏和顶部标题的 uiscrollview。
所以我遇到的问题是,如果您在查看第一部漫画后选择另一部漫画,漫画图像面板本身不会与您进入的第一部漫画不同。我设置它的方式,我承认它不完全是 mvc,所以请不要讨厌,无论如何我设置它的方式是每个漫画 uiscrollview 包含 x 个 jpg 图像,其中每个漫画集的图像名称都有一个共同的前缀然后是“funny1.jpg”、“funny2.jpg”、“funny3.jpg”和“soda1.jpg”、“soda2.jpg”、“soda3.jpg”等数字......
因此,当用户选择要在根控制器中查看的漫画时,它会调用委托并在属于委托的漫画视图控制器的实例上设置 ivars (mainDelegate.comicViewController.property) 我设置了面板的数量该漫画、标题标签的漫画名称和图像前缀。
图片的数量发生了变化(或者至少是您可以滚动浏览的数量),并且标题也发生了变化,但出于某种原因,这些图片与您最初点击的任何漫画相同。
我的整个应用程序都基于来自苹果的“滚动”代码示例。
我想如果我每次用户单击可以修复它的按钮时都添加一个 viewWillAppear:(BOOL) 动画调用到comicViewController,但它没有,毕竟这是滚动视图的布局。
这里是两个控制器各自的一些代码:
根控制器:
-(IBAction) launchComic2{
AppDelegate *mainDelegate = [(AppDelegate *) [UIApplication sharedApplication] delegate];
mainDelegate.myViewController.comicPageCount = 3;
mainDelegate.myViewController.comicTitle.text = @"\"Death by ETOH\"";
mainDelegate.myViewController.comicImagePrefix = @"etoh";
[mainDelegate.myViewController viewWillAppear:YES];
[mainDelegate.window addSubview: mainDelegate.myViewController.view];
comicViewController:
-(void) viewWillAppear:(BOOL)animated {
self.view.backgroundColor = [UIColor viewFlipsideBackgroundColor];
// 1. setup the scrollview for multiple images and add it to the view controller
//
// note: the following can be done in Interface Builder, but we show this in code for clarity
[scrollView1 setBackgroundColor:[UIColor whiteColor]];
[scrollView1 setCanCancelContentTouches:NO];
scrollView1.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView1.clipsToBounds = YES; // default is NO, we want to restrict drawing within our scrollview
scrollView1.scrollEnabled = YES;
// pagingEnabled property default is NO, if set the scroller will stop or snap at each photo
// if you want free-flowing scroll, don't set this property.
scrollView1.pagingEnabled = YES;
// load all the images from our bundle and add them to the scroll view
NSUInteger i;
for (i = 1; i <= self.comicPageCount; i++)
{
NSString *imageName = [NSString stringWithFormat:@"%@%d.jpg", self.comicImagePrefix, i];
NSLog(@"%@%d.jpg", self.comicImagePrefix, i);
UIImage *image = [UIImage imageNamed:imageName];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
// setup each frame to a default height and width, it will be properly placed when we call "updateScrollList"
CGRect rect = imageView.frame;
rect.size.height = kScrollObjHeight;
rect.size.width = kScrollObjWidth;
imageView.frame = rect;
imageView.tag = i; // tag our images for later use when we place them in serial fashion
[scrollView1 addSubview:imageView];
[imageView release];
}
[self layoutScrollImages]; // now place the photos in serial layout within the scrollview
}
- (void)layoutScrollImages
{
UIImageView *view = nil;
NSArray *subviews = [scrollView1 subviews];
// reposition all image subviews in a horizontal serial fashion
CGFloat curXLoc = 0;
for (view in subviews)
{
if ([view isKindOfClass:[UIImageView class]] && view.tag > 0)
{
CGRect frame = view.frame;
frame.origin = CGPointMake(curXLoc, 0);
view.frame = frame;
curXLoc += (kScrollObjWidth);
}
}
// set the content size so it can be scrollable
[scrollView1 setContentSize:CGSizeMake((self.comicPageCount * kScrollObjWidth), [scrollView1 bounds].size.height)];
}
对此的任何帮助将不胜感激。
尼克
【问题讨论】:
标签: iphone objective-c xcode uiscrollview uiimageview