如何防止UIView调整大小以适应ScrollView高度（禁用自动调整大小）？ [英] How to prevent UIView from being resized to fit ScrollView height (autoresizing disabled)?
问题描述
我正在使用vfr-reader库编写PDF阅读器。要在横向中显示两个页面，我将每个页面呈现为自己的视图，然后将这两个视图添加到容器视图，然后将容器视图添加到滚动视图。每个视图的autoresizingMask设置为UIViewAutoresizingNone，contentMode设置为UIViewContentModeRedraw，autoresizingSubviews设置为所有视图的NO。
I'm writing a PDF reader using vfr-reader library. To display two pages in landscape i'm rendering each page into its own view, then add these two views to a container view, then add container view to a scroll view. Each view's autoresizingMask is set to UIViewAutoresizingNone, contentMode is UIViewContentModeRedraw, autoresizingSubviews is set to 'NO' for all views.
但仍然以某种方式将容器视图自动调整以适应滚动视图的高度，我不知道这是在哪里发生的。我关心这个，因为，当自动化容器视图时，它的宽度变得比屏幕宽度大，并且我无法通过单次滑动滚动到接下来的两个页面（需要两次滑动），这很糟糕。我错过了什么？
But still somehow container view is autoresized to fit scroll view's height, and I don't know where is this happening. I care about this because, when autoresizing container view, it's width becomes larger than screen width, and I cannot scroll to the next two pages with a single swipe (two swipes are needed), which sucks. What am I missing?
EDIT 如果它有帮助的话会添加一些来。在ViewController中，我创建了一个Scroll View，其中包含以下选项：
EDIT gonna add some come if it helps. In the ViewController I create a Scroll View with following options:
theScrollView = [[ReaderScrollView alloc] initWithFrame:viewRect];
theScrollView.scrollsToTop = NO;
theScrollView.pagingEnabled = YES;
theScrollView.delaysContentTouches = NO;
theScrollView.showsVerticalScrollIndicator = NO;
theScrollView.showsHorizontalScrollIndicator = NO;
theScrollView.contentMode = UIViewContentModeRedraw;
theScrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
theScrollView.backgroundColor = [UIColor clearColor];
theScrollView.userInteractionEnabled = YES;
theScrollView.autoresizesSubviews = NO;
theScrollView.delegate = self;
[self.view addSubview:theScrollView];
当我正在绘制页面时，我正在向Scroll View添加一个UIView，它正在启动这样：
When I'm drawing pages I'm adding an UIView to the Scroll View, which is being initiated this way:
if ((self = [super initWithFrame:frame]))
{
self.autoresizesSubviews = YES;
self.userInteractionEnabled = YES;
self.contentMode = UIViewContentModeRedraw;
self.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.backgroundColor = [UIColor clearColor];
theScrollView = [[ReaderScrollView alloc] initWithFrame:self.bounds]; // Not sure about this part - why is the 2nd scroll view added?
// this is the way its done in vfr reader
theScrollView.scrollsToTop = NO;
theScrollView.delaysContentTouches = NO;
theScrollView.showsVerticalScrollIndicator = NO;
theScrollView.showsHorizontalScrollIndicator = NO;
theScrollView.contentMode = UIViewContentModeRedraw;
theScrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
theScrollView.backgroundColor = [UIColor clearColor];
theScrollView.userInteractionEnabled = YES;
theScrollView.autoresizesSubviews = NO;
theScrollView.bouncesZoom = YES;
theScrollView.delegate = self;
theContentView = [[ReaderContentPage alloc] initWithURL:fileURL page:page password:phrase landscape:(BOOL)isLandscape position:FALSE];
CGRect viewRect = CGRectZero;
viewRect.size.width = theContentView.bounds.size.width;
viewRect.size.height = theContentView.bounds.size.height;
if( isLandscape){
NSLog(@"Landscape detected in content view");
if (theContentView == NULL)
{
theContentView = [[ReaderContentPage alloc] initWithURL:fileURL page:(page+1) password:phrase landscape:(BOOL)isLandscape position:FALSE];
theContentView2 = NULL;
viewRect.size.width = theContentView.bounds.size.width;
viewRect.size.height = theContentView.bounds.size.height;
} else {
if (page == 1)
theContentView2 = NULL;
else
theContentView2 = [[ReaderContentPage alloc] initWithURL:fileURL page:(page+1) password:phrase landscape:(BOOL)isLandscape position:TRUE];
if (theContentView2 != NULL)
viewRect.size.width = theContentView.bounds.size.width*2;
}
}
if (theContentView != nil) // Must have a valid and initialized content view
{
theContainerView = [[UIView alloc] initWithFrame:viewRect];
theContainerView.autoresizesSubviews = NO;
theContainerView.userInteractionEnabled = NO;
theContainerView.contentMode = UIViewContentModeRedraw;
theContainerView.autoresizingMask = UIViewAutoresizingNone;
theContainerView.backgroundColor = [UIColor whiteColor];
theScrollView.contentSize = theContentView.bounds.size; // Content size same as view size
theScrollView.contentOffset = CGPointMake((0.0f - CONTENT_INSET), (0.0f - CONTENT_INSET));
theScrollView.contentInset = UIEdgeInsetsMake(CONTENT_INSET, CONTENT_INSET, CONTENT_INSET, CONTENT_INSET);
theThumbView = [[ReaderContentThumb alloc] initWithFrame:theContentView.bounds]; // Page thumb view
[theContainerView addSubview:theThumbView]; // Add the thumb view to the container view
[theContainerView addSubview:theContentView]; // Add the content view to the container view
if(( isLandscape) && (theContentView2 != NULL)){
[theContainerView addSubview:theContentView2]; // Add the content view to the container view
}
[theScrollView addSubview:theContainerView]; // Add the container view to the scroll view
[self updateMinimumMaximumZoom]; // Update the minimum and maximum zoom scales
theScrollView.zoomScale = theScrollView.minimumZoomScale; // Zoom to fit
}
[self addSubview:theScrollView]; // Add the scroll view to the parent container view
[theScrollView addObserver:self forKeyPath:@"frame" options:NSKeyValueObservingOptionNew context:NULL];
self.tag = page; // Tag the view with the page number
}
return self;
以这种方式创建ReaderContentPage：
And ReaderContentPage is created this way:
if ((self = [super initWithFrame:frame]))
{
self.autoresizesSubviews = NO;
self.userInteractionEnabled = NO;
self.clearsContextBeforeDrawing = NO;
self.contentMode = UIViewContentModeRedraw;
self.autoresizingMask = UIViewAutoresizingNone;
self.backgroundColor = [UIColor clearColor];
view = self; // Return self
}
推荐答案
在类中的函数 updateMinimumMaximumZoom ReaderContentView ：
计算适合屏幕的缩放比例是用单一视图完成的，但在横向上它应该从theContainerView计算。
The calculation of the zoomscale to fit the screen is done with single view, but in landscape it should be calculated form theContainerView.
尝试替换此代码
CGFloat zoomScale = ZoomScaleThatFits（targetRect.size，theContentView.bounds.size）;
with
CGFloat zoomScale = ZoomScaleThatFits（targetRect.size，theContainerView.bounds.size）;
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