I have added the functionality of UIRefreshControl in my project that uses a UITableView. The app works by fetching entries from a web service to a tableview. Below is the code i have used to add UIRefreshControl:
- (void)viewDidLoad
{
[super viewDidLoad];
UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
refreshControl.tintColor = [UIColor grayColor];
refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:#"Updating New Entries"];
[refreshControl addTarget:self action:#selector(pullToRefresh) forControlEvents:UIControlEventValueChanged];
self.refreshControl = refreshControl;
[self pullToRefresh];
}
- (void) pullToRefresh
{
counter = 1;
[self fetchEntriesNew:counter]; // My code for updating table view
[self performSelector:#selector(updateTable) withObject:nil afterDelay:2];
}
- (void)updateTable
{
[self.tableView reloadData];
[self.refreshControl endRefreshing];
}
Now if i pull to refresh, it refreshes by adding new entries if there are any and shows me the following view on top of the tableview:
Everything works great except when the app is launched or opened for the very first time, it does not show the view that i have showed in the above image, although it does refreshes the tableview. I want it to show the refresh control view every time it refreshes it. Can anyone point out what i am doing wrong? Thanks!
UPDATE: I have added [self refreshControl beginRefreshing] and the UIRefreshControl's spinner view is now showing but its above the first entry of the tableview. Can anyone point out how to correct it?
This problem had really puzzled me for a while.I found that 4-inch iOS devices don't have this problem, but 3.5-inch devices do.
I tried to find out the differences between the first time that the refreshControl beginRefreshing itself and when I operated a pull gesture.It's the pull operation.
And I checked Apple's document on UIRefreshControl.It says The control does not initiate the refresh operation directly. Instead, it sends the UIControlEventValueChanged event when a refresh operation should occur.
So I thought maybe I could add something to simulate a pull gesture to trigger refreshControl's showing.
[yourScrollView(or tableView) setContentOffset:CGPointMake(0.0f, -60.0f)
animated:YES];
[yourRefreshControl beginRefreshing];
It works!
PS. UIRefreshControl works with UIScrollView, too. [yourScrollView addSubview:yourRefreshControl] just works.
I would move your [self pullToRefresh] call to viewWillAppear instead of viewDidLoad.
There are two things that can be done to add UIRefreshControl in your tableview neither of them is added in your code
1. [self setRefreshControl:tableRefreshControl];
2. [self.m_TableView addSubview:tableRefreshControl];
Either add 1 or 2 if your class is subclass of UIViewController
If your class is subclass of UITableViewController then try to replace
self.refreshControl = refreshControl; with 2 line
before the code：
[refreshControl beginRefresh]
insert the code：
[refreshControl layoutIfNeeded]
Related
I implemented pull to refresh functionality for my controller:
- viewDidLoad {
self.refresh = [[UIRefreshControl alloc] init];
[self.refresh addTarget:self action:#selector(refreshData) forControlEvents:UIControlEventValueChanged];
[self.tableView addSubview:self.refresh];
}
- (void) refreshData {
__weak myController *weakSelf = self;
[[NetworkcallManager instance] getCall:^(NSString *result){
if(weakSelf != nil) {
[weakSelf.refresh endRefreshing];
[weakSelf.tableView reloadData];
}
}];
}
The refresh works as expected, but when I pull down the screen too hard then the entire screen disappears for a moment and then the data gets refreshed.
Is there a way to avoid disappearance of the screen? I am wondering if it is because of reloadData function. In case it calls 'viewWillAppear' then I can understand the problem I am facing. (My viewWillAppear code results in momentarily blank screen).
Edit:
If I pull down without internet connection (turned off the wifi) then the screen doesn't disappear.
I got the issue. In the code I am purging the table and then updating it. As a result, the screen disappears momentarily.
I am using a UITableView Which has a Pull down to refresh function but the spinner for pull down to refresh is not showing up when I call the [self.refreshControl beginRefreshing]
The above code is called inside the viewDidLoad cause the table is loading some data initially. The spinner works fine if I perform a pull down to refresh after the initial refresh. The title shows up but not the spinner.
Cant seem to solve this problem. It works fine on iOS 9.3.2 but not on iOS 10.
Here is the code I am using currently.
- (void)viewDidLoad
{
[super viewDidLoad];
[self setupView];
[self customSetup];
self.refreshControl = [[UIRefreshControl alloc] init];
self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:#"Updating Discounts..."];
[self.refreshControl addTarget:self action:#selector(reloadDeals) forControlEvents:UIControlEventValueChanged];
[self.refreshControl beginRefreshing];
[self.tableView setContentOffset:CGPointMake(0, -self.refreshControl.frame.size.height) animated:YES];
}
Thanks for your help in advance
before the code：
[refreshControl beginRefresh]
insert the code：
[refreshControl layoutIfNeeded]
Delaying call to refresh in viewDidLoad worked for me:
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self.refreshControl beginRefreshing];
});
Same as #jpros answer but in swift
if #available(iOS 10.0, *) {
tableView.refreshControl = refreshControl
} else {
tableView.addSubview(refreshControl)
}
refreshControl.layoutIfNeeded()
refreshControl.beginRefreshing()
This is a known and reported bug in iOS 10.
Radar rdar://27468436
I'm not sure if there are any workarounds.
You need to call [self.view layoutIfNeeded] to fix it in iOS 10. For my case it was enough to put the call to viewDidLoad (I was using storyboard in that project). For other cases viewWillAppear fits better.
- (void)viewDidLoad
{
[super viewDidLoad];
[self.view layoutIfNeeded];
...
I was only able to fix this by calling, from viewDidLoad():
refreshControl.layoutIfNeeded()
In iOS10, we should add the UIRefreshControl using setRefreshControl of UITableView or UICollectionView.
if([self.tableView respondsToSelector:#selector(setRefreshControl:)]) {
[self.tableView setRefreshControl:self.refreshControl];
}
else {
[self.tableView addSubview:self.refreshControl];
}
[self.refreshControl layoutIfNeeded];
[self.refreshControl beginRefreshing];
If your refresh indicator is not showing try enabling Bounce Vertically in Interface Builder for table view or scroll view.
I have an issue with my UIRefreshControl : after the first time it was triggered, it cancels touch on top of my first custom cell (even if it is hidden), like if it was invisible.
If I remove it from superview, then add it again, the issue is still there.
Actually I have a UITableView that is populated with some data. The user can refresh the table view by pulling it and for that I've added an UIRefreshControl to my table view like this in viewDidLoad()
self.refreshControl = [[UIRefreshControl alloc]init];
self.refreshControl.tintColor = [UIColor colorWithRed:0.35 green:0.78 blue:0.98 alpha:1.0];
[_tableView addSubview:self.refreshControl];
I've not added selector to the refreshControl object because I want the tableView to refresh only when the user stopped touching the screen. So for that I've added this ScrollView's delegate method :
- (void)scrollViewDidEndDecelerating:(UIScrollView*)scrollView {
if (self.refreshControl.isRefreshing) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
dispatch_sync(dispatch_get_main_queue(), ^{
[self refreshTable];
});
});
}
}
And here is my refresh method :
- (void)refreshTable {
//refresh code
[self.refreshControl endRefreshing];
}
I don't want to put my app online with this issue, even if this does not block user to use it !
Thanks in advance for your help !
I've found the solution by going to this post
So effectively in my case I did not have to add a selector, just implement those UIScrollViewDelegate's method :)
This question already has answers here:
Pull To Refresh in iOS 7
(4 answers)
Closed 8 years ago.
I'm trying to get the pull to refresh feature on iOS 7 in my Table View. In my viewDidLoad, I have:
refreshControl = [[UIRefreshControl alloc] init];
[self.mytableView setContentOffset:CGPointMake(0, refreshControl.frame.size.height) animated:YES];
[refreshControl beginRefreshing];
[refreshControl addTarget:self action:#selector(refreshTable) forControlEvents:UIControlEventValueChanged];
I then run:
-(void)refreshTable {
[self.mytableView reloadData];
[refreshControl endRefreshing];
}
On iOS 6, this would mean that as you pull down on the table view, it would show the circular arrow that would get stretched out as you pull, and after pulled far enough, it would refresh. Right now, I see no circular arrow. What am I missing?
You do not have to explicitly set frame or start UIRefreshControl. If it is a UITableView or UICollectionView, it should work like a charm by itself. You do need to stop it though.
Here is how you code should look like:
- (void)viewDidLoad {
[super viewDidLoad];
refreshControl = [[UIRefreshControl alloc]init];
[refreshControl addTarget:self action:#selector(refreshTable) forControlEvents:UIControlEventValueChanged];
if (#available(iOS 10.0, *)) {
self.mytableView.refreshControl = refreshControl;
} else {
[self.mytableView addSubview:refreshControl];
}
}
In your refreshTable function, you need to stop it when you are done refreshing your data. Here is how it is going to look like:
- (void)refreshTable {
//TODO: refresh your data
[refreshControl endRefreshing];
[self.mytableView reloadData];
}
Please note that if you are refreshing your data asynchronously then you need to move endRefreshing and reloadData calls to your completion handler.
You forgot to attach the UIRefreshControl to your table view.
Change your viewDidLoad to
refreshControl = [[UIRefreshControl alloc]init];
[refreshControl addTarget:self action:#selector(refreshTable) forControlEvents:UIControlEventValueChanged];
[self setRefreshControl:refreshControl];
P.S. Your view controller should be a subclass of UITableViewController.
I've implemented the new pull to refresh method in my app, adding the following code to viewDidLoad:
UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
[refreshControl addTarget:self action:#selector(handleRefresh:) forControlEvents:UIControlEventValueChanged];
[self.tableView addSubview:refreshControl];
The method handleRefresh loads some data from a DB and then refreshes the tableview.
This method only get called when the user is pulling the tableview.
Now I'd like to manually call the handleRefresh method because at some point I'm deleting some items from the DB and I need to load data again, before reloading the tableview.
How to do it?
Something like [self handleRefresh:nil]