I have this code
NSArray *wordListArray = [[NSArray alloc] initWithArray:
[[NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#”sowpods” ofType:#”txt”]
encoding:NSMacOSRomanStringEncoding error:NULL] componentsSeparatedByString:#”\n”]];
My question is how can I extract this text and update a label in a Scrollview? I just need the user to be able to scroll down and read whats in the text file...
Sounds like what you want to do is something like:
CGRect appFrame = [[[UIApplication sharedApplication] keyWindow]frame];
UIScrollView* scrollView = [[[UIScrollView alloc] initWithFrame:appFrame] autorelease];
CGRect lblFrame = CGRectMake(0.0f, 0.0f, scrollView.frame.size.width, 20.0f);
for (NSString* word in wordListArray)
{
UILabel* lbl = [[[UILabel alloc] initWithFrame:lblFrame]autorelease];
lbl.text = word;
[scrollView addSubview:lbl];
lblFrame.origin.y += 20.0f;
}
scrollView.contentSize = CGSizeMake(lblFrame.size.width, lblFrame.origin.y);
[mainView addSubview:scrollView]; // mainView = up to you
(NB: I haven't tested this, could contain errors, but just want to give you ideas to work with.)
Related
help please. I have this code that shows me images in scrollview.:
- (void)viewDidLoad
{
[super viewDidLoad];
NSArray *imgNames = [[NSArray alloc] initWithObjects:#"ip1.jpg", #"ip2.jpg", #"ip3.jpg", #"ip4.jpg", #"ip5.jpg", #"ip6.jpg", #"ip7.jpg", #"ip8.jpg", #"ip9.jpg", #"ip10.jpg",#"ip11.jpg",#"ip12.jpg",#"ip13.jpg",#"ip14.jpg",#"ip15.jpg",#"ip16.jpg",#"ip17.jpg",#"ip18.jpg",#"ip19.jpg",#"ip20.jpg",#"ip21.jpg", nil];
// Setup the array of UIImageViews
NSMutableArray *imgArray = [[NSMutableArray alloc] init];
UIImageView *tempImageView;
for(NSString *name in imgNames) {
tempImageView = [[UIImageView alloc] init];
tempImageView.contentMode = UIViewContentModeScaleAspectFill;
tempImageView.image = [UIImage imageNamed:name];
[imgArray addObject:tempImageView];
}
CGSize pageSize = scrollViewBack.frame.size; // scrollView is an IBOutlet for our UIScrollView
NSUInteger page = 0;
for(UIView *view in imgArray) {
[scrollViewBack addSubview:view];
// This is the important line
view.frame = CGRectMake(pageSize.width * page++ + 40, 0, pageSize.width - 80, pageSize.height);
}
scrollViewBack.contentSize = CGSizeMake(pageSize.width * [imgArray count], pageSize.height);
}
Now, I want a UILabel, that will show me, Image name, when I will scroll. Help me please, I can't implement that. Thanks a lot.
In your second for loop you can acces to the indexes of the objects of imgArray and imgNames, so try this:
int idx = [imgArray indexOfObject:view];
NSString *strName = [imgNames objectAtIndex:idx];
//create the label
label.text=strName;
//add the label in the scrollView
If you want to show the label just when the new image is showed, keep the two arrays as iVars and use UIPageControl to track in wich page of the scrollview you are. (Sample code).
In your loop you could do something like this. Read the apple docs. Search google for how to make a label. Its not hard to learn this stuff if you just try.
for(NSString *name in imgNames) {
// ....
UILabel *label = [[UILabel alloc] initWithFrame:WHEREYOUWANTIT];
[label setText:name];
}
I have UITableViewController with UIScrollView inside UIView as its header.
UIScrollView is used to display slideshow of images:
UITableView
-UITableViewHeaderView
-UIView
-UIScrollView
-UIImageView
...
-UIPageControl
Every image has a subview with its title and description:
UIImageView
-UIView
-UILabel
-UILabel
When I need to update my tableView a delegate method is called which reloads data in a tableView and calls addImages method:
- (void)eventsUpdated
{
if ([self respondsToSelector:#selector(setRefreshControl:)])
[self.refreshControl endRefreshing];
[self.tableView reloadData];
[self addImages];
}
Here is how I add my images:
- (void)addImages
[self.scrollView.subviews makeObjectsPerformSelector:#selector(removeFromSuperview)];
for (int i = 0; i < images.count; i++) {
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
UIImageView *subview = [self createImageViewForEvent:[images objectAtIndex:i] inFrame:frame];
subview.frame = frame;
[self.scrollView addSubview:subview];
}
self.scrollView.contentSize = CGSizeMake(scrollView.frame.size.width*images.count, scrollView.frame.size.height);
pageControll.currentPage = 0;
pageControll.numberOfPages = images.count;
}
- (UIImageView *)createImageViewForEvent:(Event *)event inFrame:(CGRect)frame
{
UIImage *image;
NSString *imageName = [event.imageName lastPathComponent];
NSString *bundleFilePath = [[NSBundle mainBundle] pathForResource:[imageName stringByDeletingPathExtension] ofType:[imageName pathExtension]];
image = [UIImage imageWithContentsOfFile:bundleFilePath];
UIImageView *output = [[UIImageView alloc] initWithImage:image];
output.frame = frame;
UIView *descriptionView = [[UIView alloc] initWithFrame:CGRectMake(0, frame.size.height*0.7, frame.size.width, frame.size.height*0.3)];
descriptionView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.5];
descriptionView.alpha = 1.0;
UILabel *header = [[UILabel alloc] initWithFrame:CGRectMake(10, 5, frame.size.width-20, 12)];
header.textColor = [UIColor colorWithRed:210/256.0 green:217/256.0 blue:231/256.0 alpha:1.0];
header.font = [UIFont fontWithName:#"Helvetica" size:17];
header.backgroundColor = [UIColor clearColor];
header.lineBreakMode = UILineBreakModeTailTruncation;
header.numberOfLines = 1;
UILabel *description = [[UILabel alloc] initWithFrame:CGRectMake(10, 22, frame.size.width-20, 28)];
description.textColor = [UIColor colorWithRed:255/256.0 green:255/256.0 blue:255/256.0 alpha:1.0];
description.font = [UIFont fontWithName:#"Helvetica" size:12];
description.backgroundColor = [UIColor clearColor];
description.lineBreakMode = UILineBreakModeTailTruncation;
description.numberOfLines = 2;
header.text = event.title;
[descriptionView addSubview:header];
description.text = event.shortDesription;
[descriptionView addSubview:description];
[output addSubview:descriptionView];
return output;
}
After first launch everything works fine, but if I try to reload my tableView and call addImages again, all UILabels disappear, only UIImageView and UIView are visible.
UPD:
What I have noticed, is that my UILabels appear after some time, approximately after 30 seconds. I have never experienced something similar before
UPD 2:
After I reload my tableView and scrollview, scrollView's content is not updated right away, only after I start scrolling
I reproduced a sample project from the code you posted, and didn't find any refreshing issues on the labels nor on any other component. This leads me to think the problem is not in the code you posted, but rather somewhere else.
Usually when you see such a delay, it is because some code that should not be running in parallel, is running in parallel.
I would suggest you check how and when you perform your call to eventsUpdated. You must make sure that call is performed on the main thread, and only once your array of events has finished updating. To check that, you can add add the following line in eventsUpdated:
NSLog(#"Current: %#, main: %#", [NSThread currentThread], [NSThread mainThread]);
Please post the log! :-)
I would suggest you also add to your question the code from the method that calls eventsUpdated, as it could also be of help.
At first, never do something like
[scrollView.subviews makeObjectsPerformSelector:#selector(removeFromSuperview)];
Scroll view has some internal views (scroll indicators, for example), so you're removing them which may dealloc them and cause strange crashes any time later.
As for your problem - try calling bringSubviewToFront: of your UIImageView to get your labels infront of everything else
I have a UITable and when I click on a row I load a set of images.
I create the images with
UIImage *image = [UIImage imageWithData:data];
The problem is that ever time I click on the same row, the images are re-allocated into memory, like if no cache it is used and no memory is freed, so the allocated memory keep increasing. (I see this using the Inspector on both the device and the emulator)
I am releasing everything and also, with clang, everything looks fine.
The point is that after a while my app crashes.
Any suggestion or idea?
EDIT:
Here is the portion of code I think is generating the issue:
UIView *main = [[[UIView alloc] initWithFrame:rectScrollView] autorelease];
for (int i=0; i<[contentArray count]; i++) {
float targetWidth = rectScrollView.size.width;
float targetHeight = rectScrollView.size.height;
Link *tmp_link = [contentArray objectAtIndex:i];
AsyncImageView* asyncImage = nil;
if(tmp_link!=nil){
CGRect imageFrame = CGRectMake(targetWidth*i, 0, targetWidth, targetHeight);
//asyncImage = [[[AsyncImageView alloc] initWithFrame:imageFrame ] autorelease];
asyncImage = [[AsyncImageView alloc] initWithFrame:imageFrame ];
asyncImage.contentMode = UIViewContentModeScaleAspectFit;
NSURL* url = [NSURL URLWithString:[[IMG_SERVER_URL stringByAppendingString: tmp_link.url] stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]];
[asyncImage loadImageFromURL:url];
[self.scrollView addSubview:(UIImageView *)asyncImage];
[asyncImage release];
}
if ([tmp_link.caption length] > 0 && asyncImage!=nil) {
float marginTop = 25;
UILabel *caption = [[UILabel alloc] init];
caption.text = tmp_link.caption;
caption.textAlignment = UITextAlignmentCenter;
caption.textColor = [UIColor whiteColor];
caption.font = [UIFont systemFontOfSize:12];
caption.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.4];
CGRect captionFrame = CGRectMake((i * targetWidth), marginTop+10, targetWidth, 20.0f);
caption.frame = captionFrame;
[self.scrollView addSubview:caption];
[caption release];
}
//[asyncImage release];
}
[main addSubview:scrollView];
[scrollView release];
if (pageControlEnabledTop) {
rectPageControl = CGRectMake(0, 5, scrollWidth, 15);
}
else if (pageControlEnabledBottom) {
//rectPageControl = CGRectMake(0, (scrollHeight - 25), scrollWidth, 15);
rectPageControl = CGRectMake(0, (scrollHeight), scrollWidth, 15);
}
if (pageControlEnabledTop || pageControlEnabledBottom) {
//pageControl = [[[UIPageControl alloc] initWithFrame:rectPageControl] autorelease];
pageControl = [[UIPageControl alloc] initWithFrame:rectPageControl];
pageControl.numberOfPages = [contentArray count];
pageControl.currentPage = page;
[main addSubview:pageControl];
[pageControl release];
}
if (pageControlEnabledTop || pageControlEnabledBottom || rememberPosition) self.scrollView.delegate = self;
//if (margin) [margin release];
return (UIScrollView *)main;
And it is used like this:
reviewImagesImage = [[IGUIScrollViewImage alloc] init];
if([currentReview.linkScreenshots count]>0){
//reviewImages
reviewImages = [[UIView alloc] init];
//placing the images
CGRect frameImages = reviewImages.frame;
frameImages.origin.x = 10;
frameImages.origin.y = (infoView.frame.origin.y + infoView.frame.size.height + 10.0f);
frameImages.size.width = 300;
frameImages.size.height = 350.0f;
reviewImages.frame = frameImages;
reviewImages.backgroundColor = [UIColor clearColor];
[reviewImagesImage setContentArray:currentReview.linkScreenshots];
[reviewImagesImage setWidth:reviewImages.frame.size.width andHeight: reviewImages.frame.size.height];
[reviewImagesImage enablePageControlOnBottom];
[reviewImagesImage setBackGroudColor: [UIColor clearColor]];
UIScrollView *tmp_sv = [reviewImagesImage getWithPosition:0];
[reviewImages addSubview:tmp_sv];
[self.view addSubview:reviewImages];
[reviewImages release];
}
I have noticed that if I try to release reviewImagesImage my app crashes :/
Of course no cache is used because new UIImage will be created from the data every time. If memory usage significantly increased like you have said, it is most likely that it is our fault that unintentionally keep the reference retained somewhere.
Once you've set your image with imageWithData, save the image to the filepath in the app bundle.
i am using the following code to scroll image on scrooll view,
StoryViewScroller = [[[UIScrollView alloc] initWithFrame:CGRectMake(0.0f, 79.0f, 320.0f, 262)] autorelease];
StoryViewScroller.contentSize = CGSizeMake(NPAGES * 320.0f, StoryViewScroller.frame.size.height);
StoryViewScroller.pagingEnabled = YES;
StoryViewScroller.delegate = self;
StoryViewScroller.showsHorizontalScrollIndicator = NO;
StoryViewScroller.scrollsToTop = YES;
// Load in all the pages
for (i = 0; i < NPAGES; i++)
{
NSString *filename = [NSString stringWithFormat:#"%d.jpg", i+1];
UIImageView *iv = [[UIImageView alloc] initWithImage:[UIImage imageNamed:filename]];
iv.frame = CGRectMake(i * 320.0f, 0.0f, 320.0f, 262);
[StoryViewScroller addSubview:iv];
NSLog(#"I is :: %d" ,i);
[iv release];
}
[self.view addSubview:StoryViewScroller];
this enable mein tos scroll view from left to right and vice versa.what should i change to sroll view to top to bottom and vice versa.
sugggestions
regards
To enable vertical scrolling set appropriate height to the contentSize, e.g.
StoryViewScroller.contentSize = CGSizeMake(320.0f, NPAGES*StoryViewScroller.frame.size.height);
Hi i created a TTStyledTextLabel, works well.
Now i want to make URL clickable, i've done this:
textLabel.text = [TTStyledText textFromXHTML:[content objectForKey:#"content"] lineBreaks:YES URLs:YES];
but my links are still unclickable. Do i have to setup a UIWebView first? Where to declare it?
Another thing is, is it possible to resize Images inside my TTStyledTextLabel to fit them to the Label Size?
Thanks in advance
// edit
what i have exactly done:
textLabel = [[TTStyledTextLabel alloc] initWithFrame:CGRectMake(0.0f, 70.0f, 320.0f, 297.0f)];
textLabel.contentInset = UIEdgeInsetsMake(20, 15, 20, 15);
textLabel.font = [UIFont systemFontOfSize:14];
textLabel.text = [TTStyledText textFromXHTML:[content objectForKey:#"content"] lineBreaks:YES URLs:YES];
[textLabel sizeToFit];
//CGFloat height = textLabel.height;
[scrollView addSubview:textLabel];
scrollView.contentSize = textLabel.frame.size;
an NSLog of my [content objectForKey:#"content"] returns something like this:
Download-Link
My Links are highlighted in my label, but they are unclickable.
i initialized my textlabel in - (void)viewDidLoad in a UIViewController
the [content objectForKey:#"content"] should return data containing string to display
if you'll add the url to TTURLMap it will also open the relevant controller
the following code snippet should work
self = [super init];
TTStyledTextLabel* label = [[[TTStyledTextLabel alloc] initWithFrame:CGRectMake(0, 0, 320, 230)] autorelease];
label.text = [TTStyledText textFromXHTML:#"link text" lineBreaks:YES URLs:YES];
[label setFont:[UIFont systemFontOfSize:16]];
[[self view] addSubview:label];
//edit
So you probably need to map "*" in the URLMap if you are using the TTNavigator, something like:
TTNavigator* navigator = [TTNavigator navigator];
navigator.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[navigator.window makeKeyAndVisible];
TTURLMap* map = navigator.URLMap;
[map from:#"*" toViewController:[TTWebController class]];
this will map all of the urls to the TTWebController which will open a webview to browse in
I've same problem.Try to use
[navigator setRootViewController:"your main controller";]
It's work for me.