I've successfully implemented a drop down refresh into my rss feed so that when I pull down the UITableView, it should refresh. All is well in that sense as the date on the pull down refreshes etc. but my UITableView doesn't refresh.
I've followed this code: DropDownRefresh.
Am I missing something to actually refresh the tableview?
Thanks.
Refresh Code
- (void)reloadTableViewDataSource {
//should be calling your tableviews data source model to reload.
//put here just for demo.
[self performSelector:#selector(refresh)];
_reloading = YES;
}
- (void)refresh {
for (NSString *feed in _feeds) {
NSURL *url = [NSURL URLWithString:feed];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDelegate:self];
[_queue addOperation:request];
}
}
Are you implementing the delegate methods:
#pragma mark EGORefreshTableHeaderDelegate Methods
- (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view{
[self reloadTableViewDataSource];
[self performSelector:#selector(doneLoadingTableViewData) withObject:nil afterDelay:3.0];
}
Have a look at the Demo example (View folder) for more details.
My guess is you've got the following code so far:
- (void)reloadTableViewDataSource
{
// should be calling your tableviews data source model to reload
// put here just for demo
_reloading = YES;
}
So you might do something like:
[self.tableView reloadData];
to trigger a reload of the table's cells.
Related
I have a tableView and need to perform a function once the tableView has been reloaded. How do I know if reloadData has finished? Lets say I have methodA that populates the tableView, and once [tableView1 reloadData] has been completed, I want to call methodB. Can anyone help me with this? I've been searching for hours... Thank you!
- (void) methodA
{
NSString *URLa = [NSString stringWithFormat:#"http://www.website.com/page.php?
v1=%#&v2=%#&v3=%#",v1, v2, v3];
NSURL *url = [NSURL URLa];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
(void) [[NSURLConnection alloc] initWithRequest:request delegate:self];
[tableView1 reloadData];
}
You can add a method/category on UITableView or even subclass UITableView:
-(void)reloadDataAndWait:(void(^)(void))waitBlock {
[self reloadData];//if subclassed then super. else use [self.tableView
if(waitBlock){
waitBlock();
}
}
And you need to use it as
[self.tableView reloadDataAndWait:^{
//call the required method here
}];
The problem is that you call reloadData immediately after starting the URL request. That does not make sense because the request has not been completed at that point.
The correct way would be to call reloadData and methodB in connectionDidFinishLoading, after you have updated your data source with the response from the URL request. At that point you know if the number of rows is zero or not, and there is no need to wait for the table view update to complete.
Once I get updated data from server for my table.
I use following code snip to Hide progress bar when table reload gets complete.
[UIView animateWithDuration:0 animations:^{
[your_table_view reloadData];
} completion:^(BOOL finished)
{
//Table reload completed TODO here
//Hide progress bar etc.
}];
I am trying to learn Xcode by making a simple app.
But I been looking on the net for hours (days) and I cant figure it out how I make a button that open a UIWebView in another ViewController :S
first let me show you some code that I have ready:
I have a few Buttons om my main Storyboard that each are title some country codes like UK, CA and DK.
When I press one of those Buttons I have an IBAction like this:
- (IBAction)ButtonPressed:(UIButton *)sender {
// Google button pressed
NSURL* allURLS;
if([sender.titleLabel.text isEqualToString:#"DK"]) {
// Create URL obj
allURLS = [NSURL URLWithString:#"http://google.dk"];
}else if([sender.titleLabel.text isEqualToString:#"US"])
{
allURLS = [NSURL URLWithString:#"http://google.com"];
}else if([sender.titleLabel.text isEqualToString:#"CA"])
{
allURLS = [NSURL URLWithString:#"http://google.ca"];
}
NSURLRequest* req = [NSURLRequest requestWithURL:allURLS];
[myWebView loadRequest:req];
}
How do I make this open UIWebview on my other Viewcontroller named myWebView?
please help a lost man :D
Well, you've firstViewController already designed and coded, now you've to create secondViewController with a UIWebView binded in IB it self, also it have a setter NSString variable like strUrl that you need to pass at the time of pushing or presenting secondViewController, and assign it to UIWebView in viewDidLoad of secondViewController. See my answer about how to pass a NSString? Also UIWebView has its delegates method (What's delegate & datasource methods? - Apple Doc) Which you can use to handle URL request.
These are the delegate of UIWebView, if you'll going to use it, you need to give UIWebView delegate to self.
- (void)webViewDidStartLoad:(UIWebView *)webView;
- (void)webViewDidFinishLoad:(UIWebView *)webView;
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;
firstViewController.m
- (IBAction)ButtonPressed:(UIButton *)sender {
NSURL* allURLS;
//get your URL
secondViewControlelr *secondView=[[secondViewControlelr alloc]init];
second.urlToLoad=allURLS;
[self.navigationController pushViewController:secondView animated:YES];
}
secondViewControlelr.h
//declare url and set property
NSURL *urlToLoad;
secondViewControlelr.m
- (void)viewDidLoad
{
myWebView=[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, 320, 460)];
[self.view addSubview:myWebView];
NSURLRequest *urlReq=[NSURLRequest requestWithURL:self.urlToLoad cachePolicy:NSURLCacheStorageNotAllowed timeoutInterval:10];
[myWebView loadRequest:urlReq];
}
I have a UIWebView which will load the documents. All the supported documents mentioned for webview it is working. But sometimes , the UIWebView is getting crashed whenever I move back and forth quickly. I mean I am clicking back and opening file again and again. If I do so , my app is getting crashed.
Any idea why this is happening ?? It is working cool for video,audio and txt files, but weird crashing for the Office docs and numbers,pages documents.
Please help me out !!
-(void) backBtnPressed
{
[_webView stopLoading];
if ([_webView superview])
{
[_webView removeFromSuperview];
self.navigationItem.rightBarButtonItem = nil;
}
}
- (void) loadFile:(NSString*)filePath
{
NSURL* url = [NSURL fileURLWithPath:filePath];
NSURLRequest* request = [NSURLRequest requestWithURL:url];
[webView loadRequest:request];
[webView setScalesPageToFit:YES];
}
Set the delegate property of the webview to nil in the dealloc of your controller
If you are moving from one view controller to another, do the following
[webView stopLoading];
webView.delegate = nil;
Implement this and chk what error you are getting.
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
NSLog("Error=%s",error);
}
The problem is solved.Setting the UIWebView to nil and loading the request again in the WebView. But now only at most worst case the App is getting crashed.
Try this :
-(void)viewWillDisappear:(BOOL)animated
{
if([webView isLoading])
{
[webView stopLoading];
}
}
Just adding this here on the off chance that someone else is making the same beginner mistake:
Remember that webView.delegate is a weak reference. If you set it to something else than self your delegate may get destroyed if there are no other references to it, which will cause all kinds of crashes.
Try to do the following. It works for me.
[webView stopLoading];
[webView release];
webView = nil;
webView.delegate = nil;
I use webview in my UIVIewController and load the local HTML file in it using following method.
[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:filePath]]];
If I put this method in ViewDidLoad, I can see white flicking while navigating to my controller that doesn't look good.
I tried putting this method in ViewWillAppear like below. I am using webViewLoaded flag to make sure that webview has been loaded then only show the current view else it waits but it is going in infinite loop of waiting!
- (void)viewWillAppear:(BOOL)animated {
webViewLoaded = NO;
webView.scalesPageToFit = allowZoom;
webView.dataDetectorTypes = UIDataDetectorTypeNone;
webView.delegate = self;
[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:filePath]]];
int count = 0;
while(webViewLoaded == NO)
{
NSLog(#"Waiting...");
[NSThread sleepForTimeInterval:0.1];
if(count++ > 10) break;
}
}
- (void)webViewDidFinishLoad:(UIWebView *)localwebView {
webViewLoaded = YES;
}
I have also tried the same thing in ViewDidLoad but still its going in infinite loop.
Please note that webViewLoaded is "volatile BOOL" but the webview delegate method is not getting called. Not sure what's going on!
Could anyone please help me to fix this. Thanks.
First : You're blocking your main thread and not giving WebView any chance to finish loading. Never block your main thread.
Second : There are two UIWebView delegate methods : webViewDidFinishLoad and webView:didFailLoadWithError: - make sure to listen to both.
If you're trying to wait until WebView completes loading and only show your controller afterwards - use delegation or blocks. Please note that this is not a proper way of doing things - i'm just modifying your example to make it work :
child controller (with WebView) :
-(void)startLoadingWithParent:(id)_parent {
self.parent = _parent;
NSURL * url = [[NSBundle mainBundle] URLForResource:#"resource" withExtension:#"html"];
[webView loadRequest:[NSURLRequest requestWithURL:url]];
}
-(void)webViewDidFinishLoad:(UIWebView *)webView {
[parent showMe:self];
}
-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
[parent showError:error];
}
master controller :
-(void)doSomething {
SecondController * ctrl; /// secondController should be created AND has its view loaded at this point
/// ctrl = [SecondController new];
/// ctrl.view;
[ctrl startLoadingWithParent:self];
/// show user that we're doing something - display activity indicator or something
}
-(void)showMe:(UIViewController*)me {
[self.navigationController pushViewControllerAnimated:me];
}
Try using [NSURL fileURLWithPath:filePath]
use Following code for
[self performSelectorInBackground:#selector(webViewLoaded) withObject:nil];
so that it will not affect your UI
this code works fine , its show activityIndicator loading and hide after loading
but lets say if its on loading stage and then i go back then my apps quit , so how to avoid this
if i go back quickly withiut site fully loaded then it quits ( i think activityIndicator is culprit)
**
- (void)webViewDidStartLoad:(UIWebView *)webView {
[activityIndicator startAnimating];
// myLabel.hidden = FALSE;
}
- (void)webViewDidFinishLoad:(UIWebView *)webView {
[activityIndicator stopAnimating];
activityIndicator.hidesWhenStopped=TRUE;
//myLabel.hidden = TRUE;
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
self.title=#"KKH Website";
[super viewDidLoad];
NSURL *requestUrl = [NSURL URLWithString:#"http://www./index.html"];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:requestUrl];
[aWw loadRequest:requestObj];
}
**
updates
if i link uiwebview delegate to fileowner then its creating isuee , but i need delegate also since i want to show loading
i forgot to release my webview :(
[aWw release];
now its fixed