In my app scrolview is made active using the following code.
scroll.contentSize = CGSizeMake(320, 760);
[scroll setScrollEnabled:YES];
[scroll setCanCancelContentTouches:NO];
scroll.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scroll.clipsToBounds = YES;
scroll.pagingEnabled = NO;
scroll.autoresizesSubviews=YES;
[scroll setContentMode:UIViewContentModeScaleAspectFill];
But after using the UIImagePicker/controller.ie. after selecting the image from the phone gallery,scrolling is not working. The above code is written in the viewWillAppear section.Can anyone help me so that I can make scrolling working even after the UIImagePickerController? Thanks for any help ...
I had a similar issue lately. Mine was in having a ViewControllerA which was a parent to ViewControllerB which in turn is a parent of ViewControllerC1..N. ViewControllerB has a scrollview which scrolls views of ViewControllerC1..N. It is reproducible only on iOS9.
If I present UIImagePickerController to get images from gallery (sourceType == UIImagePickerControllerSourceTypePhotoLibrary) from ViewControllerA after dismissing it scrollview of ViewControllerB stops scrolling correctly.
I have made a workaround. I push dummy view controller into navigation stack, then present image picker and then pop back to ViewControllerA.
This way it works.
It seems like in iOS9 UIImagePickerController messes up something with touch events in its presenting view controller.
replace your dismissing code like this and check:
[picker dismissViewControllerAnimated:YES completion:^{
scroll.contentSize = CGSizeMake(320, 760);
[scroll setScrollEnabled:YES];
[scroll setCanCancelContentTouches:NO];
scroll.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scroll.clipsToBounds = YES;
scroll.pagingEnabled = NO;
scroll.autoresizesSubviews=YES;
[scroll setContentMode:UIViewContentModeScaleAspectFill];
}];
Related
I have main dashboard (UITableViewController) and once i sign in i need to show this page with a welcome message which am showing using a UIViewController.
How can i show this popup from my ViewDidAppear() method ?
Am using following code and its not working
-(void)viewDidAppear:(BOOL)animated{
popupObj= [self.storyboard instantiateViewControllerWithIdentifier:#"popup"];
[popupObj setModalPresentationStyle:UIModalPresentationCurrentContext];
}
please help me..
i saw couple of stackoverflow links
Update
When i change my code to this one
-(void)viewDidAppear:(BOOL)animated{
popupObj= [self.storyboard instantiateViewControllerWithIdentifier:#"popup"];
// [popupObj setModalPresentationStyle:UIModalPresentationCurrentContext];
popupObj.modalPresentationStyle = UIModalPresentationOverCurrentContext;
popupObj.modalTransitionStyle = UIModalPresentationPopover;
[self presentViewController:popupObj animated:YES completion:nil];
}
Now i can see my UIViewController coming as popup but now UIViewController
coming as full screen view.
But i need only this frame (320 , 320)
popupObj= [self.storyboard instantiateViewControllerWithIdentifier:#"popup"];
popupObj.view.frame = CGRectMake(20, 200, 280, 168);
[self.view addSubview:popupObj.view];
[self addChildViewController:popupObj];
You can add UIViewController as subview and set it's frame so it will look like popup.
Hope this will help you.
I have two way,maybe not good, but work at most of time.
First,when the second view controller appear, show a screen shot of the first view controller. like this:
- (void)setBackGround {
UIGraphicsBeginImageContextWithOptions(self.view.frame.size, NO, [UIScreen mainScreen].scale);
[self.presentingViewController.view drawViewHierarchyInRect:self.view.bounds afterScreenUpdates:NO];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.view.layer.contents = (__bridge id)(image.CGImage);
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
if (!_isShown) {
_isShown = YES;
[self setBackGround];
}
}
Do't forget set "_isShown = NO" when init.
Second: you can only init a view, and show it on a view controller with animation. code at ：http://blog.moemiku.com/?p=101
I have update a example on the blog. Direct download url
Your code creates the view controller and sets its presentation style, but doesn't actually present it. For that to happen you need this line after the two you have right now:
[self presentViewController:popupObj animated:true completion:nil];
Please set navigation controller on your rootviewcontroller :
-(void)viewDidAppear:(BOOL)animated
{
popupObj= [self.storyboard instantiateViewControllerWithIdentifier:#"popup"];
[self.navigationController presentViewController:popupObj animated:YES completion:nil];
}
Or
-(void)viewDidAppear:(BOOL)animated
{
popupObj= [self.storyboard instantiateViewControllerWithIdentifier:#"popup"];
[self.view addSubview:popupObj.view];
}
In my app, I do a search asynchronously. When that completes my mapViewController with pins for the locations is displayed. 2 seconds after that, I do a modal transition over to a listViewController. I set the backgroundcolor like this:
self.view.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.65];
Making it possible to see the map behind it.
The problem is this: Less then a second after the listView appears you can see the map in the background for a second before it goes away. What I can see in the background now, is the mainViewController the app starts with.
it looks like this:
Less than a second later:
Any help/explanation would be greatly appreciated.
Your view is still transparent, but once your modal controller is at the top of the stack, the view behind it is hidden.
Try using :
yourController.modalPresentationStyle = UIModalPresentationCurrentContext;
[yourController present...];
This code seems to work. I hope it will help.
-(void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
MKMapView *mapView = [MKMapView new];
[self.view addSubview:mapView];
mapView.frame = self.view.bounds;
UIGestureRecognizer *gestureRecognizer = [UITapGestureRecognizer new];
[gestureRecognizer addTarget:self action:#selector(displayTransparentVC)];
[self.view addGestureRecognizer:gestureRecognizer];
}
-(void)displayTransparentVC
{
UIViewController *vc = [TransparentViewController new];
self.modalPresentationStyle = UIModalPresentationCurrentContext;
[self presentViewController:vc animated:YES completion:^{
}];
}
I have a UIPopoverController that I am loading with a ViewController to hold a UIWebView. When I press a button to present the Popover, the webpage loads fine. I can dismiss the Popover just as fine as well. When I press a button to present the Popover again, the UIWebView reloads. Is there a way to maintain/persist the state of the WebView in the ViewController so that the content remains the same when the popover is presented/dismissed?
Maybe another question is, when a Popover is dismissed, is my ViewController wiped? I don't believe it should be because it isn't a local variable, but I'm not so sure if I have a misunderstaing of how UIPopoverController's behave.
Relevant code below:
In my main ViewController:
_popoverMenuVC = [[TBPopoverMenuViewController alloc] init];
_popoverMenuVC.delegate = self;
_popoverMenuVC.contentSizeForViewInPopover = CGSizeMake(300, 300*(1+sqrt(5)/2.));
_popoverCtr = [[UIPopoverController alloc] initWithContentViewController:_popoverMenuVC];
Code for my button:
- (void)menuBtnPressed:(id)sender
{
if (IS_IPAD) {
UIButton *btn = (UIButton*)sender;
if (!_popoverCtr.isPopoverVisible) {
//set url for popover webview
_popoverMenuVC.popoverURL = #"http://www.google.com";
// show popover
[_popoverCtr setPopoverContentSize:CGSizeMake(300, 300*(1+sqrt(5)/2.))];
[_popoverCtr presentPopoverFromRect:btn.frame
inView:self.view
permittedArrowDirections:UIPopoverArrowDirectionDown
animated:YES];
} else {
// hide popover
[_popoverCtr dismissPopoverAnimated:YES];
}
}
Code for my popoverMenuVC:
-(void) viewDidAppear:(BOOL)animated{
[self setupUIs];
}
- (void)setupUIs
{
// webview
wv = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 300, 300*(1+sqrt(5)/2.))];
//activity indicator
self.activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
self.activityIndicator.frame = CGRectMake(0.0, 0.0, 40, 40);
self.activityIndicator.center = self.view.center;
// darkview for activity indicator
self.darkView = [[UIView alloc] initWithFrame:CGRectMake(0, 0,300, 300*(1+sqrt(5)/2.))];
[self.darkView setBackgroundColor:[UIColor blackColor]];
[self.darkView setAlpha:0.4];
wv.delegate = self;
wv.scalesPageToFit = YES;
wv.scrollView.bounces = NO; //get rid of bounce for popover menu
[self.view addSubview:wv];
}
A few delegates for handing activity indicator:
#pragma mark Activity Indicator
- (void) showLoadingIndicator
{
[self.view insertSubview:self.darkView aboveSubview:self.view];
[self.view insertSubview:self.activityIndicator aboveSubview:self.darkView];
[self.activityIndicator startAnimating];
}
- (void) hideLoadingIndicator
{
[self.activityIndicator stopAnimating];
[self.activityIndicator removeFromSuperview];
[self.darkView removeFromSuperview];
}
#pragma mark UIWebView Delegates
-(void)webViewDidStartLoad:(UIWebView *)webView{
NSLog(#"Webview is starting to load");
[self showLoadingIndicator];
}
-(void)webViewDidFinishLoad:(UIWebView *)webView{
NSLog(#"request: %#", [[webView request] description]);
if(!webView.loading){
NSLog(#"Webview has finished loading");
[self hideLoadingIndicator];
}
}
I have a very similar implementation of this working for iPhone, without the Popover obviously, just with ViewControllers and it seems to work fine. Wondering if this has to work with the PopoverController itself...
Thanks for any help!
Edit 1:
I moved the following code to my main ViewController:
_popoverMenuVC = [[TBPopoverMenuViewController alloc] init];
_popoverMenuVC.wv = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 300, 300*(1+sqrt(5)/2.))];
_popoverMenuVC.wv.scalesPageToFit = YES;
_popoverMenuVC.wv.scrollView.bounces = NO; //get rid of bounce for popover menu
_popoverMenuVC.req = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"http://www.google.com"]];
_popoverCtr = [[UIPopoverController alloc] initWithContentViewController:_popoverMenuVC];
I have nothing in my viewDidAppear function anymore, I now moved it to viewDidLoad:
- (void)viewDidLoad
{
[super viewDidLoad];
wv.delegate = self;
[wv loadRequest:req];
[self.view addSubview:wv];
}
But the WebView doesn't load anymore (which I think is related to this issue: iOS 7 UIWebView doesn't load webpage)
Moving the above code from ViewDidLoad to viewDidAppear will load my WebView, yet the same reloading problem persists.
Any additional help would be appreciated!
Edit 2:
I did some code refactoring in order to focus in on what might be causing this behavior:
In my main ViewController, I am setting up my PopoverViewController, along with its WebView, and setting it to be the init content for our UIPopoverController:
_popoverMenuVC = [[TBPopoverMenuViewController alloc] init];
_popoverMenuVC.wv = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 300, 300*(1+sqrt(5)/2.))];
_popoverMenuVC.wv.scalesPageToFit = YES;
_popoverMenuVC.wv.scrollView.bounces = NO; //get rid of bounce for popover menu
_popoverMenuVC.req = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"http://www.google.com"]];
[_popoverMenuVC.view addSubview:_popoverMenuVC.wv];
_popoverCtr = [[UIPopoverController alloc] initWithContentViewController:_popoverMenuVC];
All of this is happening once outside of my TBPopoverMenuViewController's code.
In my TBPopoverMenuViewController.h, I set up a property for wv and req.
In my TBPopoverMenuViewController.m, I synthesize my wv, but not my req.
Here is my viewDidLoad, where I set the wv's delegate to self.
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.view setBackgroundColor:[UIColor whiteColor]];
wv.delegate = self;
// [wv loadRequest:_req];
}
And in viewDidAppear, this is where I load my request.
-(void) viewDidAppear:(BOOL)animated{
[super viewDidAppear:NO];
[self setupActivityIndicator];
[wv loadRequest:_req];
}
Trying to load my request anywhere else, in view did load, or even in the main ViewController, it doesn't load the request in the popover. It only seems to want to happen in the viewDidAppear function.
Further, when I try to load the popover the second time, you can see the previous wv with the page loaded where it was before, but then almost immediately after the request seems to reload on top of that webview.
Does anyone have a solution? How can I maintain my webview when the popover dismisses and is re-presented. This seems to work fine on iPhone in a non-popover implementation, making me think that there is something I'm missing for iPad/iOS7/UIPopoverControllers.
Any help would be appreciated!
Edit 3:
After some debugging with Xcode's Instruments tool, I've realized that calling:
[wv loadRequest:_req];
In the viewDidAppear of my ViewController results in a memory leak! So there seems to be something essential in my problem with the UIWebView reloading and where/how I'm loading my request. As I've mentioned before, I've tried calling loadRequest outside of my Popover's ViewController in my main View Controller, with no luck. I also tried to call loadRequest in viewDidLoad, with no luck as well.
I was able to successfully call loadRequest in my menuBtnPressed function after the popover is presented:
- (void)menuBtnPressed:(id)sender
{
if (IS_IPAD) {
popOverBtn = (UIButton*)sender;
if (!_popoverCtr.isPopoverVisible) {
[_popoverCtr setPopoverContentSize:CGSizeMake(300, 300*(1+sqrt(5)/2.))];
[_popoverCtr presentPopoverFromRect:popOverBtn.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
[_popoverMenuVC.wv loadRequest:_popoverMenuVC.request];
} else {
// hide popover
[_popoverCtr dismissPopoverAnimated:YES];
}
Which boils down to the two places I can actually successfully call loadRequest for the UIWebView in my popover are:
-in viewDidApepar in the ViewController
-after presenting my popover with a button press
Both of these seem to still result in a memory leak according to Xcode's Instruments tools. I still can't get my UIWebView to maintain/persist state when going back from presenting -> dismissing -> re-presenting the popover.
Any suggestions?
The viewDidAppear method of the popover is called every time the present is done.
So every time the popover is presented, the current code adds a new UIWebView which goes to the default url (with all the previous web views from the previous presents underneath).
A couple of changes should give you the behavior you want:
In the popover content view controller, move the call to setupUIs from viewDidAppear to viewDidLoad.
In the main view controller, move the setting of popoverURL to where the popover content view controller is first created (right after you alloc+init it).
It turns out the answer to my problem as to...call loadRequest twice.
//setup popover menu vc
_popoverMenuVC = [[TBPopoverMenuViewController alloc] init];
_popoverMenuVC.wv = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 300, 300*(1+sqrt(5)/2.))];
_popoverMenuVC.delegate = self;
_popoverMenuVC.wv.scalesPageToFit = YES;
_popoverMenuVC.wv.scrollView.bounces = NO; //get rid of bounce for popover menu
_popoverMenuVC.request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"http://www.google.com/"]];
[_popoverMenuVC.wv loadRequest:_popoverMenuVC.request]; //first request
[_popoverMenuVC.view addSubview:_popoverMenuVC.wv];
_popoverCtr = [[UIPopoverController alloc] initWithContentViewController:_popoverMenuVC];
[_popoverMenuVC.wv loadRequest:_popoverMenuVC.request]; // second request
This results in the behavior I want. The UIWebView loads in the PopoverViewController with the page loaded, and when I present-> dismiss-> re-present the popover, the page UIWebView is where I left it. I have no idea why this works though, it seems like a bug or a hack, having to call the function twice. The loadRequest also seems to result in a memory leak according to the Instruments toolset in Xcode.
So I solved my problem, but I'm still a bit confused as to why this is the solution. Luckily I stumbled onto it...
Any clarification by anyone more experienced would be appreciated!
I am trying to debug a really weird issue in the following code:
if(condition1) {
ImageViewController* imageViewer = [[ImageViewController alloc] initWithImageData:tappedItem];
[self presentViewController:imageViewer animated:YES completion:^{
[imageViewer loadImage];
}];
}
else if(condition2) {
DocumentViewController* docViewer = [[DocumentViewController alloc] init];
[self presentViewController:docViewer animated:YES completion:nil];
}
In other words, depending on the state of condition1 and condition2, one of two subclasses of UIViewController will be displayed modally to the user.
In the second case all is well, but in the first the view controller is not presented with the usual animation that shows it sliding in from the bottom of the screen. Instead, after a brief delay, it just shows up all of a sudden, covering the entire screen. Another oddity is that in the dismissal animation, the image view inside the view controller is transparent.
Removing the completion block has no effect. Replacing my view controller with an instance of UIViewController also has no effect, other than demonstrating that for some reason, animations don't work for UIViewController instances either.
Thinking that maybe I did something wrong in viewDidLoad etc, I tried commenting out the view load/appear methods but to no avail.
Pushing the view controller onto the nav stack is not an option because the app has a tab bar and I don't want to be visible.
update
Replacing my instance of ImageViewController with a DocumentViewController does result in an animation. The question now becomes: what could I have done in ImageViewController to mess up the animation?
I've found a solution but I still have no idea what the real cause was.
The fix was to set a background color for the view of the UIViewController being displayed modally in its viewDidload method e.g.
self.view.backgroundColor = [UIColor grayColor];
If I ever figure out what really happened, I will post here.
How about presenting the view controller on the tab bar controller:
if(condition1) {
ImageViewController* imageViewer = [[ImageViewController alloc] initWithImageData:tappedItem];
[self.tabBarController presentViewController:imageViewer animated:YES completion:^{
[imageViewer loadImage];
}];
}
else if(condition2) {
DocumentViewController* docViewer = [[DocumentViewController alloc] init];
[self.tabBarController presentViewController:docViewer animated:YES completion:nil];
}
It happened to me as well.. changing the background colour didn't really help.
I did the following - it turns up to be quite nice:
-(void) viewWillAppear:(BOOL)animated
{
[super viewWillAppear:NO];
self.view.userInteractionEnabled = FALSE;
self.view.hidden = TRUE;
self.navigationController.navigationBar.alpha = 0;
}
-(void) viewDidAppear:(BOOL)animated
{
[super viewDidAppear:NO];
float width = self.view.frame.size.width;
float height = self.view.frame.size.height;
self.view.frame = CGRectMake(0, height, width, height);
self.view.hidden = FALSE;
[UIView animateWithDuration:0.7f animations:^{
self.view.frame = CGRectMake(0, 0, width, height);
self.navigationController.navigationBar.alpha = 1;
} completion:^(BOOL finished){
self.view.userInteractionEnabled = TRUE;
}];
}
Setting the background color works for me in iOS 8.
Also uncheck the opaque setting in the Interface Builder works!
The scrollview in my main page stop working if I push something to the navigation controller and then pop back to the main page. It works normally if I reopen the application without pushing anything to the navigation controller yet. The scrollview is a horizontal scrollview which extends beyond the frame. I use it to scroll through buttons like when you switch application in iOS (iOS multitasking).
This is the code where I push a new vc
UIViewController *newVC = [[UIViewController alloc] init];
UILabel *label = [[UILabel alloc] initWithFrame:self.view.bounds];
[label setTextAlignment:NSTextAlignmentCenter];
label.text = [NSString stringWithFormat:#"promo %i detail view",[sender tag]];
label.backgroundColor = [UIColor whiteColor];
[newVC.view addSubview:label];
[self.navigationController setNavigationBarHidden:NO animated:NO];
[self.navigationController pushViewController:newVC animated:YES];
when that view controller is popped and navigation controller move back to the main page I hide the navigationBar.
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
if(viewController == self){
[self.navigationController setNavigationBarHidden:YES];
NSLog(#"%d", [self.scrollMenuBar isScrollEnabled]);
}
}
checking isScrollEnable return true.
I tried pushing a normal modal view and the same problem occur.
If you resize the scroll view content size in the viewDidLayoutSubview function it will work again.
- (void) viewDidLayoutSubviews {
[self resizeScrollViewContent];
}
Add
[self.scrollbarMenu setScrollEnabled:YES]; in viewdidAppear of main page
Add
[scroll setContentSize:CGSizeMake(width , height)];
Still if it doesnt work
2 possibilities
Memory is not valid.
Some other view comes above the scrollview
Problem solved by creating the UIScrollview and the button inside it programmatically. Not sure what I did wrong with storyboard, but it's a pain.