After load htmlString, contentSize of scrollView in UIWebView don't changed. In other my viewControllers all good, but now it's something mysterious
I have
UIWebView *contentWebView;
I make it in some method
- (void)makeContent
{
...
contentWebView = [[UIWebView alloc] initWithFrame:CGRectMake(5, imageView.originY + imageView.height + 5, mainView.width - 10, 100)];
contentWebView.delegate = self;
contentWebView.scrollView.scrollEnabled = NO;
contentWebView.contentMode = UIViewContentModeScaleAspectFit;
NSLog(#"%#", factDict[#"text"]);
[contentWebView loadHTMLString:factDict[#"text"] baseURL:nil];
contentWebView.height = contentWebView.scrollView.contentSize.height;
[mainView addSubview:contentWebView];
}
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
NSLog(#"%f %f %f %f ", webView.height, webView.scrollView.contentSize.height, contentWebView.height, contentWebView.scrollView.contentSize.height);
[webView sizeToFit];
NSLog(#"%f %f %f %f ", webView.height, webView.scrollView.contentSize.height, contentWebView.height, contentWebView.scrollView.contentSize.height);
...
}
Early in other controllers contentWebView.height = contentWebView.scrollView.contentSize.height; help me, but now it's not work
In log I have next
So I don\t understand why contentsize.height not changed
EDIT
In my another viewcontrollers all good
- (void)makeScrollView
{
CGFloat width = [Utils widthOfMainViewForOrientation:self.interfaceOrientation];
[mainView removeFromSuperview];
mainView = [[UIView alloc] initWithFrame:CGRectMake((self.view.width - width) / 2, 15, width, 100)];
mainView.backgroundColor = [UIColor whiteColor];
if ([self.fullInfoDictionary[#"content"] length]) {
contentWebView = [[UIWebView alloc] initWithFrame:CGRectMake(6, 4, mainView.width - 12, 100)];
contentWebView.contentMode = UIViewContentModeScaleAspectFit;
contentWebView.delegate = self;
HelperDf.htmlString = self.fullInfoDictionary[#"content"];
[contentWebView loadHTMLString:self.fullInfoDictionary[#"content"] baseURL:nil];
contentWebView.scrollView.scrollEnabled = NO;
[mainView addSubview:contentWebView];
}
[self.scrollView addSubview:mainView];
}
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
contentWebView.height = contentWebView.scrollView.contentSize.height;
NSLog(#"%f %f %f %f", webView.height, webView.scrollView.contentSize.height, contentWebView.height, contentWebView.scrollView.contentSize.height);
[self reloadFrames];
}
i have next
I get htmlString from this controller
HelperDf.htmlString = self.fullInfoDictionary[#"content"];
And set in my first UIWebVIew but results - NO.
You can it's no matter if stay contentWebView.scrollView.scrollEnabled = NO; I change to YES, but results are same - in second case all good in first - NO
You need to change NO to YES your contentWebView.scrollView.scrollEnabled, such like
contentWebView.scrollView.scrollEnabled = YES;
EDITED
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
[webView sizeToFit];
webView.scrollView.contentSize = CGSizeMake(320, contentWebView.scrollView.contentSize.height + 60);
}
The problem is that your view isn't visible yet. The values you are looking for are only made visible once it is added to a view which is in the view stack.
Somewhere along the way it seems that your view isn't added to at the time when you are checking your values.
Related
I loaded a pdf in a scrollview, and I would like to go directly to the next page without having the animation scrolling.
CGRect scrollViewRect = CGRectInset(viewRect, -scrollViewOutset, 0.0f);
theScrollView = [[UIScrollView alloc] initWithFrame:scrollViewRect]; // All
theScrollView.autoresizesSubviews = NO;
theScrollView.contentMode = UIViewContentModeRedraw;
theScrollView.showsHorizontalScrollIndicator = NO;
theScrollView.showsVerticalScrollIndicator = NO;
theScrollView.scrollsToTop = NO;
theScrollView.delaysContentTouches = NO;
theScrollView.pagingEnabled = YES;
theScrollView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
theScrollView.backgroundColor = [UIColor clearColor];
theScrollView.delegate = self;
[self.view addSubview:theScrollView];
Is it possible ?
You have to use below method to jump on direct offset of your next page by below method.
[objUIScrollView setContentOffset:CGPointMake(YOUR_X, YOUR_Y) animated:NO]
animated = NO;
If you are loading PDF through WebView than you need to follow below code:
webview.scrollView.contentOffset = CGPointMake(YOUR_X, YOUR_Y);
Note : Use this above code in your Next Button page or after loading
WebView properly may be in below method.
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
}
Hope this will work as you expected.
Sure, simply use:
[theScrollView scrollRectToVisible:CGRectMake(0.0f, 0.0f, 0.0f, 0.0f) animated:NO];
or
[theScrollView setContentOffset:CGPointMake(0.0f, 0.0f) animated:NO];
and change the CGPoint or CGRect to the offset of the page of your liking.
I am trying to set the webview's scrollview using the code below but it disabled the scrolling/interaction of the webview.
[webView sizeToFit];
webView.scrollView.scrollEnabled = YES;
webView.scrollView.contentSize = CGSizeMake(375, rfqWeb.scrollView.contentSize.height + 700);
rfqWeb.userInteractionEnabled = YES;
If you want to change the "scrollable size", I suggest to do:
- (void)setInsetsTop:(CGFloat)top bottom:(CGFloat)bottom {
self.webview.frame = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height - bottom);
[[self.webview scrollView] setContentInset:UIEdgeInsetsMake(top, 0, bottom, 0)];
}
I call it from another class
[htmlWebViewController setInsetsTop:0.0f bottom:44.0f];
If you use it in the same class just use
[self setInsetsTop:0.0f bottom:44.0f];
Has anyone managed to successfully add a header or footer view to a WKWebView ScrollView?
I'm currently trying to do this using the method described here for a UIWebView Adding a header view to a UIWebView similar to Safari and Articles.
When this method is used in a WKWebView the content view origin.y is correctly changed but content is cut off at the bottom.
Using the scroll view content offset is also not possible as it breaks fixed positioned CSS elements in the web view.
In webView Delegate method
- (void)webViewDidFinishLoad:(UIWebView *)webView
add the following codebase,
mainWebViewObj.scrollView.contentInset = UIEdgeInsetsMake(headerView.frame.size.height,0.0,headerView.frame.size.height,0.0);
mainWebViewObj.scrollView.backgroundColor = [UIColor whiteColor];
if(![headerView superview])
{
[webView.scrollView addSubview:headerView];
[webView.scrollView bringSubviewToFront:headerView];
}
[mainWebViewObj.scrollView setContentOffset:
CGPointMake(0, -mainWebViewObj.scrollView.contentInset.top) animated:NO];
this worked perfect for me. Hope it solves your problem.
Here's an example that I think does as you describe. It offsets the web content by setting contentInset on the scrollView, and by offsetting the header view frame by a negative amount:
#implementation ViewController
{
WKWebView* _webView;
UIView* _headerView;
}
- (void)viewDidLoad
{
[super viewDidLoad];
_webView = [[WKWebView alloc] initWithFrame: self.view.bounds];
[self.view addSubview: _webView];
[_webView loadRequest: [NSURLRequest requestWithURL: [NSURL URLWithString: #"http://www.stackoverflow.com"]]];
[_webView.scrollView setContentInset: UIEdgeInsetsMake(100, 0, 0, 0)];
_headerView = [[UIView alloc] initWithFrame: CGRectMake(0, -100, 375, 100)];
_headerView.backgroundColor = [UIColor redColor];
[_webView.scrollView addSubview: _headerView];
}
- (void) viewDidLayoutSubviews
{
[super viewDidLayoutSubviews];
_webView.frame = self.view.bounds;
CGRect f = _headerView.frame;
f.size.width = _webView.bounds.size.width;
_headerView.frame = f;
}
I have a UISegmentedControl where the first control will display the text within a UITextView while the second control displays a scrollable UIImageView.
In the initial startup, if I switch to the second control, the image displays and switching back to the first control, the image disappears and the UITextView shows.
However, when I switch to the second control the 2nd time and switch back to the first control, the image is still there and I cannot get the UITextView to show anymore.
My code has it to where the image is hidden and the text is shown in the first control, and vice versa in the second control.
Why was it working the first time, but then not working the second time I switched between controls?
What am I doing wrong?
Thanks
-(void)viewDidLoad
{
self.scrollView.delegate = self;
self.textView.text = #"THIS IS A TEST. THIS IS A TEST. THIS IS A TEST. THIS IS A TEST. THIS IS A TEST. THIS IS A TEST.";
self.textView.hidden = NO;
}
-(void)setScroller
{
CGSize scrollableSize = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height);
[self.scrollView setContentSize:scrollableSize];
self.imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"test.png"] ];
self.imageView.frame = CGRectMake(0, 0, self.scrollView.frame.size.width, self.view.frame.size.height);
self.scrollView.backgroundColor = [UIColor blackColor];
self.scrollView.minimumZoomScale = 1.0 ;
self.scrollView.maximumZoomScale = self.imageView.image.size.width / self.scrollView.frame.size.width;
//self.scrollView.zoomScale = 1.0;
[self.scrollView addSubview:self.imageView];
}
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.imageView;
}
- (IBAction)segmentedControl:(UISegmentedControl *)sender
{
if (self.segmentedControl.selectedSegmentIndex == 0)
{
// Display apppropriate info for About
self.imageView.hidden = YES;
self.textView.hidden = NO;
}
else
{
self.imageView.hidden = NO;
self.textView.hidden = YES;
[self setScroller];
}
}
You should remove [self setScroller]; from the - (IBAction)segmentedControl:(UISegmentedControl *)sender method, and put it in -(void)viewDidLoad instead. You're calling [self setScroller]; every time you switch to the second segment.
Your code should look like:
-(void)viewDidLoad
{
[super viewDidLoad];
self.scrollView.delegate = self;
[self setupScroller];
}
-(void)setupScroller
{
// Set contentSize
CGSize scrollableSize = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height);
self.scrollView.contentSize = scrollableSize;
// Add textView
self.textView.text = #"THIS IS A TEST. THIS IS A TEST. THIS IS A TEST. THIS IS A TEST. THIS IS A TEST. THIS IS A TEST.";
self.textView.hidden = NO;
// Add ImageView
self.imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"test.png"]];
self.imageView.frame = CGRectMake(0, 0, self.scrollView.frame.size.width, self.view.frame.size.height);
self.imageView.hidden = YES;
[self.scrollView addSubview:self.imageView];
// Configure Zoom Scales and backgroundColor
self.scrollView.backgroundColor = [UIColor blackColor];
self.scrollView.minimumZoomScale = 1.0 ;
self.scrollView.maximumZoomScale = self.imageView.image.size.width / self.scrollView.frame.size.width;
}
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.imageView;
}
- (IBAction)segmentedControl:(UISegmentedControl *)sender
{
if (self.segmentedControl.selectedSegmentIndex == 0)
{
// Display appropriate info for About
self.imageView.hidden = YES;
self.textView.hidden = NO;
}
else
{
self.imageView.hidden = NO;
self.textView.hidden = YES;
}
}
Your problem probably is that you creating a lot of instances of "imageView"
To solve your problem I suggest:
-(void)setScroller
{
CGSize scrollableSize = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height);
[self.scrollView setContentSize:scrollableSize];
if(self.imageView == nil) {
self.imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"test.png"]];
[self.scrollView addSubview:self.imageView];
}
self.imageView.frame = CGRectMake(0, 0, self.scrollView.frame.size.width, self.view.frame.size.height);
self.scrollView.backgroundColor = [UIColor blackColor];
self.scrollView.minimumZoomScale = 1.0 ;
self.scrollView.maximumZoomScale = self.imageView.image.size.width / self.scrollView.frame.size.width;
//self.scrollView.zoomScale = 1.0;
[self.imageView setNeedsDisplay];
[self.imageView setImage:[UIImage imageNamed: #"test.png"]];
}
I've put only the Alloc of the self.imageView + the addSubView to the if,
All the rest are out side,
Now it will work
I am working on a reader app. when you read one magazine, it will display first five pages and download the rest pages one by one. there is a scrollview to view the thumbnail image of pages. At the beginning, if the page needs downloading, the corresponding thumbnail view's alpha value is set to 0.5 (the thumbnail images are in the file,no need to download). when the page is downloaded, i will update the thumbnail view's value to 1.0. I use one operation to download the page, and when one is downloaded i use delegate to set thumbnail view's alpha.
But when i update thumbnail view's alpha value, it still the same as the beginning. it seems the alpha has no effect. I wonder is there anything wrong with my code? some snippets are as follows:
In the PageViewController.m
- (void)loadView
{
[super loadView];
//...
[self createSlideUpViewIfNecessary];
[self downloadPages];
}
- (void)createSlideUpViewIfNecessary {
if (!slideUpView) {
[self createThumbScrollViewIfNecessary];
// create container view that will hold scroll view and label
CGRect frame = CGRectMake(CGRectGetMinX(self.view.bounds), CGRectGetMaxY(self.view.bounds), CGRectGetWidth(self.view.bounds), CGRectGetHeight(thumbScrollView.frame));
slideUpView = [[UIView alloc] initWithFrame:frame];
[slideUpView setBackgroundColor:[UIColor blackColor]];
[slideUpView setOpaque:NO];
[slideUpView setAlpha:0.75];
[[self view] addSubview:slideUpView];
// add subviews to container view
[slideUpView addSubview:thumbScrollView];
}
}
- (void)createThumbScrollViewIfNecessary {
if (!thumbScrollView) {
float scrollViewHeight = THUMB_HEIGHT + THUMB_V_PADDING;
float scrollViewWidth = CGRectGetWidth(self.view.bounds);
thumbScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, scrollViewWidth, scrollViewHeight)];
[thumbScrollView setCanCancelContentTouches:NO];
[thumbScrollView setClipsToBounds:NO];
// now place all the thumb views as subviews of the scroll view
// and in the course of doing so calculate the content width
float xPosition = THUMB_H_PADDING;
for (int i = 0; i < magazine.pageNum ; i++) {
Page *page = [magazine.pages objectAtIndex:i];
NSString *name = page.pageName;
NSString *mfjName =[name stringByReplacingOccurrencesOfString:#".mfj" withString:#"Small.mfj"];
UIImage *thumbImage = nil;
if([mfjName hasSuffix:#".mfj"])
thumbImage = [Reader loadMfjFromSprOrCache:magazine MFJ:mfjName];
ThumbImageView *thumbView;
if (thumbImage) {// sometimes mfjname is 0 which means white page in normal and black thumbnail in thumbnail scrollview.
if (!mThumbnailSizeUpdated) {
mThumbnailWidth = thumbImage.size.width;
mThumbnailHeight = thumbImage.size.height;
mThumbnailSizeUpdated = YES;
}
thumbView = [[ThumbImageView alloc] initWithImage:thumbImage];
} else {
CGRect thumbFrame;
if (mThumbnailSizeUpdated) {
thumbFrame = CGRectMake(0, 0, mThumbnailWidth, mThumbnailHeight);
} else {
mThumbnailWidth = 80;
mThumbnailHeight = 100;
thumbFrame = CGRectMake(0, 0, mThumbnailWidth, mThumbnailHeight);
}
thumbView = [[ThumbImageView alloc] initWithFrame:thumbFrame];
}
NSString *mfjPath= [[magazine getDownloadPath] stringByAppendingPathComponent:name];
if (![magazine getFileInfo:name]&&![[NSFileManager defaultManager] fileExistsAtPath:mfjPath]) {
thumbView.alpha = 0.5;
}
[thumbView setBackgroundColor:[UIColor blackColor]];
[thumbView setTag:THUMBVIEW_OFFSET+i];
[thumbView setDelegate:self];
[thumbView setImageName:name];
CGRect frame = [thumbView frame];
frame.origin.y = THUMB_V_PADDING;
frame.origin.x = xPosition;
frame.size.width = frame.size.width+30;
frame.size.height = frame.size.height+40;
[thumbView setFrame:frame];
[thumbScrollView addSubview:thumbView];
UILabel *pageIndexLabel = [[UILabel alloc] initWithFrame:CGRectMake(xPosition, frame.origin.y+frame.size.height-THUMB_LABEL_HEIGHT, frame.size.width, THUMB_LABEL_HEIGHT)];
[pageIndexLabel setBackgroundColor:[UIColor clearColor]];
[pageIndexLabel setText:[NSString stringWithFormat:#"%d",(i+1)]];
[pageIndexLabel setTextColor:[UIColor whiteColor]];
[pageIndexLabel setTextAlignment:UITextAlignmentCenter];
[thumbScrollView addSubview:pageIndexLabel];
xPosition += (frame.size.width + THUMB_H_PADDING);
}
thumbScrollView.showsHorizontalScrollIndicator = NO;
[thumbScrollView setContentSize:CGSizeMake(xPosition, scrollViewHeight)];
}
}
- (void)downloadPages
{
DownloadOperation *op = [[DownloadOperation alloc] initWithMagazine:magazine];
op.delegate = self;
[[(AppDelegate *)[[UIApplication sharedApplication] delegate] sharedOperationQueue] addOperation:op];
}
- (void)downloadOperation:(DownloadOperation *)operation finishedAtIndex:(NSUInteger)index
{
if (thumbScrollView){
[thumbScrollView viewWithTag:THUMBVIEW_OFFSET+index].alpha = 1.0;
}
}
In DownloadOperation.m
- (void)main
{
// ...
NSUInteger index = 0;
for (Page *page in mMagazine.pages)
{
if (/*page doesn't exist*/){
// download the page;
if ([delegate respondsToSelector:#selector(downloadOperation:finishedAtIndex:)]) {
[delegate downloadOperation:self finishedAtIndex:index];
}
}
index++;
}
}
you're using operation queue to download images -> thus, your finish callbacks might arrive not on the main thread, but you are trying to update you UI anyway - try wrapping your UI interaction into dispatch_async on main thread:
dispatch_async(dispatch_get_main_queue), ^{
if (thumbScrollView){
[thumbScrollView viewWithTag:THUMBVIEW_OFFSET+index].alpha = 1.0;
}
});
Thanks to #Inafziger for clues on this.