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我做持有一個UIScrollView一個觀點:的UIScrollView用的UIImageView和使用transitionFromView手勢舉止怪異
self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(10, 65, 300, 188)];
//BackViews will hold the Back Image
BackViews = [[NSMutableArray alloc] init];
for (int i=0; i<BigPictures.count; i++) {
[BackViews addObject:[NSNull null]];
}
FrontViews = [[NSMutableArray alloc] initWithCapacity:BigPictures.count];
[self.pageControl setNumberOfPages:BigPictures.count];
然後,添加包含圖像的幾個UIImageViews的:
//BigPictures holds objects of type UIImage
for (int i = 0; i < BigPictures.count; i++) {
UIImageView *ImageView = [[UIImageView alloc] initWithImage:[BigPictures objectAtIndex:i]];
ImageView.frame = [self.scrollView bounds];
[ImageView setFrame:CGRectMake(self.scrollView.frame.size.width * i, ImageView.frame.origin.y, ImageView.frame.size.width, ImageView.frame.size.height)];
//this saves the FrontView for later (flip)
[FrontViews insertObject:ImageView atIndex:i];
[self.scrollView addSubview:test];
}
// Detect Single Taps on ScrollView
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(flip)];
[self.scrollView addGestureRecognizer:tap];
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * BigPictures.count, self.scrollView.frame.size.height);
self.scrollView.pagingEnabled = YES;
self.scrollView.delegate = self;
好到目前爲止好。現在該做的flipImage部件的製備方法:
- (void)flip {
int currentPage = self.pageControl.currentPage;
UIView *Back = nil;
if ([BackViews objectAtIndex:currentPage] == [NSNull null]) {
//CreateBackView is just creating an UIView with text in it.
Back = [self CreateBackView];
[BackViews replaceObjectAtIndex:currentPage withObject:Back];
[UIView transitionFromView:[[self.scrollView subviews] objectAtIndex:currentPage] toView:[BackViews objectAtIndex:currentPage] duration:0.8 options:UIViewAnimationOptionTransitionFlipFromLeft completion:NULL];
} else {
[UIView transitionFromView:[[self.scrollView subviews] objectAtIndex:currentPage] toView:[FrontViews objectAtIndex:currentPage] duration:0.8 options:UIViewAnimationOptionTransitionFlipFromRight completion:NULL];
[BackViews replaceObjectAtIndex:currentPage withObject:[NSNull null]];
}
[self.view addSubview:Back];
[self rebuildScrollView];
}
這是rebuildScrollView做什麼:
- (void)rebuildScrollView
{
for (UIView *subview in self.scrollView.subviews) {
[subview removeFromSuperview];
}
for (int i = 0; i < BigPictures.count; i++) {
if ([BackViews objectAtIndex:i] == [NSNull null]) {
[self.scrollView addSubview:[FrontViews objectAtIndex:i]];
} else {
[self.scrollView addSubview:[BackViews objectAtIndex:i]];
}
}
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * BigPictures.count, self.scrollView.frame.size.height);
self.scrollView.pagingEnabled = YES;
self.scrollView.delegate = self;
}
所以行爲如下:
- 如果我點擊在第一張圖片(滾動視圖中的第三張圖片)中,效果就是我想要的效果,這意味着前端圖像轉過來並顯示空白(白)回到中間有一些文字
- 如果我點擊第二張圖片,圖片會轉動,但後面是完全空的,顯示窗口的灰色背景。如果我滾動到其他圖像,仍然顯示正面圖像(如預期)
- 現在我點擊第三個圖像,它與1)很好。
- 當前佈局現在是[BackView,Nothing,Backview)
- 讓我們再運行一次。但現在我點擊最後一個圖像和它一樣2):
任何想法去錯在這裏什麼
編輯:一些新的發現我一倍圖片的數量,這是怎麼了前和Backviews被放置(翻轉每一個之後)P =圖片& B = Backview
- P_1(B_1) - 實際上唯一正確的
- P_2(空 - 應B_2)
- P_3(B_2 - 應該是B_3)
- P_4(空 - 應該是B_4)
- P_5(B_3 - 應該是B_5)
- P_6(空 - 應該是B_6)