I am trying to add a UIActivityIndicator to my custom view (programmatically). I am using the following code. But I dont see anything on the screen. Any idea why ?
Thanks.
UIActivityIndicatorView *activityIndicator=[[[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(75, 395, 200, 200)] autorelease];
[activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhiteLarge];
activityIndicator.center=self.view.center;
[self.view addSubview:activityIndicator];
UIActivityIndicator has its hidesWhenStopped property equal to YES by default - that is it is hidden if you do not start animating it. So to make it appear on the screen try one of the following (whichever is more suitable for you):
set hidesWhenStopped property to NO
start animating it (using -startAnimating method)
comment "activityIndicator.center=self.view.center;"
Another reason is maybe because you're not set the activity indicator position correctly. From what I see, you want to place the activity indicator to the center of it's parent view. But to do that, you must do something like activityIndicator.center = CGPointMake(self.view.frame.origin.x + self.view.bounds.size.width / 2.0, self.view.frame.origin.y + self.view.bounds.size.height / 2.0);
Related
I am adding a TTTableViewController into an existing UIViewController, one strange thing I found is that the frame properties of the initialized TTTableViewController are wired, e.g. in a iOS layout.
I have:
UIStatusBar
UINavigationController
UIViewController
UITabBar
In order to set the TTTableViewController fill in all the remaining space I need to set the height to 460 instead of 367. (367 = 480-20-44-49)
e.g.
self.tableViewController.view.frame = CGRectMake(0, 0, 320, 460.0f);
instead of
self.tableViewController.view.frame = CGRectMake(0, 0, 320, 367.0f);
Why is it so?
*Edit for clarification: I mean TTTableViewController on the top of TTViewController (using [self.view addSubview:self.tableViewController.view];), and I need to set the self.tableViewController.view.frame = CGRectMake(0, 0, 320, 460.0f); instead of 367
It depends on when you are setting the frame, I think. I'm pretty sure when you set the frame in viewDidLoad, for example, you'll be setting it before the status bar and other things are taken into account. There might be other cases like this. If you set it to 320:460, it'll be resized to take into account the status bar and other stuff afterwards, making it fill in the rest of the screen. If you set it to 320:367 because you've already taken into account that stuff, it'll get resized again and squished (basically scaled down twice), making it only fill part of the screen. If you're using viewDidLoad you could try sticking it in another method (maybe viewWillAppear?) or just keep using 320:460.
It'd be nice to know when you set the frame, exactly. Also keep in mind that I could be way off. My mind's feeling a little fuzzy right now.
As per my understanding, only the size of your status bar is deducted i.e. 480-20 = 460. actually status bar is 22 pts but its approx.
Its just like when you add a viewcontroller to your navigation controller or your tab bar controller the size is auto rendered. So same is the case here, the three20 automatically adjusts the size of the view and if you try to set it to something smaller then that it behaves differently.
Its a nice question though. Happy Coding. Cheers!!
I wouldn't add a view of a different view controller into the main view of your current view.
You should present the TTTableViewController using the controller's present / dismiss functions. if you don't want to include the slide up effect, so the users won't see that it's a "different screen", use the boolean flag when you present the controller.
[self presentModalViewController:vc animated:NO];
Alternatively, use a TTTableView without the controller:
tableView = [[TTTableView alloc] initWithFrame:CGRectMake(0, kScrollViewHeight + kSignupLabelHeight, 320, kTableViewHeight) style:UITableViewStyleGrouped];
[tableView setBackgroundColor:[UIColor clearColor]];
tableView.delegate = self;
tableView.dataSource = [TTSectionedDataSource dataSourceWithObjects:
#"",
[TTTableTextItem itemWithText:#"Sign Up" URL:#"tt://signupController"],
nil];
[self.view addSubview:tableView];
Like a this code .
if use iOS6 , get current device.
if();
-(void)viewdidLoad{
TTTableViewController ＊tt = [TTTableViewController new];
CGRect frame = [UIScreen mainScreen].bounds;
tt.frame = frame;
tt.delegate = self;
[self.view addsubview:tt];
}
I have created a bar to appear over the keyboard for next/previous/done like the safari browser. However, the setalpha property of the UIview of the bar doesn't seem to be working. No matter what value I set it to, nothing changes. Here is the code...
here is where the create view is called..
-(void)textFieldDidBeginEditing:(UITextField *)textField{
// Call the createInputAccessoryView method we created earlier.
// By doing that we will prepare the inputAccView.
[self createInputAccessoryView];
// Now add the view as an input accessory view to the selected textfield.
[textField setInputAccessoryView:inputAccView];
// Set the active field. We' ll need that if we want to move properly
// between our textfields.
txtActiveField = textField;
}
here is where i actually create and set its values...
-(void)createInputAccessoryView{
// Create the view that will play the part of the input accessory view.
// Note that the frame width (third value in the CGRectMake method)
// should change accordingly in landscape orientation. But we don’t care
// about that now.
inputAccView = [[UIView alloc] initWithFrame:CGRectMake(10.0, 0.0, 310.0, 40.0)];
// Set the view’s background color. We’ ll set it here to gray. Use any color you want.
[inputAccView setBackgroundColor:[UIColor darkGrayColor]];
// We can play a little with transparency as well using the Alpha property. Normally
// you can leave it unchanged.
[inputAccView setAlpha: 0.1f];
... code for adding buttons and their properties
}
so basically this is all there is to it. but the setAlpha property does nothing, regardless of what I set it to. However, background color works fine. Any ideas?
Thanks
If you want it to look like the prev/next/done bar in Safari etc, create a UIToolbar with the style set to translucent black. This also has the advantage of laying out your buttons nicely, with the correct style, and auto adjusting between landscape and portrait.
Not a direct answer to your question but probably a better way of acheiving what you actually want.
out of utter curiosity try using:
UIView *overlay = [[UIView alloc] initWithFrame:CGRectMake(10.0, 0.0, 310.0, 40.0)];
overlay.backgroundColor = [UIColor blackColor];
overlay.alpha = 0.5f;
[self.view addSubview:overlay];
it's hard to tell what the issue is without being able to see how many views you have and how you've stacked them. check you've defined your "addSubview" and what the hierarchy looks like
I've managed to manually detect rotation and set my own rotation effects between two UIViewControllers. When in the first, rotating to landscape prompts the second to be pushed on with a manual animation. The status bar moves to the correct orientation. However, the view loaded by the second UIViewController is not in the position I expected it. Instead there is margin on the left where the status bar previously was and margin/space at the bottom that I was expecting to be filled by the view.
(Click to enlarge. The orange box is simply to reference where 0,0 is in the rotated UIView, CustomView)
The code I'm using in my view controller to do the rotation is:
-(void)loadView {
CustomView *customView = [[CustomView alloc] initWithFrame:CGRectMake(0, 20, 480, 300)];
self.view = customView;
CGAffineTransform rotate = CGAffineTransformMakeRotation(degreesToRadian(90));
[self.view setTransform:rotate];
[customView release];
}
Any help would be much appreciated!
EDIT Managed to solve after a variety of trial and error approaches - answer provided below. Perhaps there's a more elegant/obvious solution though - if so feel free to provide!
try these on the viewcontrollers. Solved the 20 pixel(status bar height) clip issue when I was getting fullscreen subviews to show up.
[viewcontroller1.view setCenter:CGPointMake(viewcontroller1.view.center.x, viewcontroller1.view.center.y-20)];
and/or
[viewcontroller2.view setCenter:CGPointMake(viewcontroller2.view.center.x-20, viewcontroller2.view.center.y)];
I managed to solve this by setting the View's bounds after the transformation:
self.view.bounds = CGRectMake(20, -20, 480, 300);
Can we add activity indicator as subview to UIButton?
If yes then plz tell me how to do that?
I used [button addSubview:activityIndicator];
Not working...
I found that adding a UIActivityIndicatorView to a UIButton was a really useful method to allow users to know something is happening without having to use the MBProgressHUD (I think the HUD is really good but should not be used in all situations.
For this reason I created two functions:
I have already allocated my UIButton so it is a class variable called _confirmChangesButton
I then create my activity indicator, set its frame (taking into account the button size) and then adding the indicator is easy.
- (void)addActivityIndicatorToConfirmButton {
// Indicator needs to be in the middle of the button. So half the screen less half the buttons left inset less half the activity indicator size
CGRect rect = CGRectMake([UIScreen mainScreen].bounds.size.width/2 - 10 - 15, 5, 30, 30);
UIActivityIndicatorView * activity = [[UIActivityIndicatorView alloc] initWithFrame:rect];
activity.hidesWhenStopped = YES;
[_confirmChangesButton setTitle:#"" forState:UIControlStateNormal];
[_confirmChangesButton addSubview:activity];
[activity startAnimating];
}
Having a removal function is also useful if you are using blocks. It might be that the completion task comes back with a failure and so we want to remove the indicator and change the title back. In this function we need to make sure to remove the indicator and not the button label which is the other subview on this button.
- (void)removeActivityIndicatorFromConfirmButton {
UIActivityIndicatorView * activity = _confirmChangesButton.subviews.lastObject;;
[activity removeFromSuperview];
[_confirmChangesButton setTitle:#"Confirm Change" forState:UIControlStateNormal];
}
I found that using these two you can create a much better user experience letting the user know what is going on when they press buttons.
Hope this helps
Use the below code below to add acitivity indicator a button or any uiview object
UIActivityIndicatorView *aView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
aView.frame = CGRectMake(0, 0, {yourButton}.frame.size.width, {yourButton}.frame.size.height);
aView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
[{yourButton} addSubview:aView];
[aView startAnimating];
Hope this will help..
I don't think it's possible to add a view to a button. UIButton have this method because it's inherited from UIVIew.
The real question is : why do you want to add an activity indicator on a button and not elsewhere ?
did you do [activityIndicator startAnimating]; ALso as u are using it in a tableview just check if the tags are set properly
I am using a tableview with custom cells and want to change the content of the tableview on a button click. I am using an activity indicator while the cells are loading data.
This is how I am creating the indicatorview
indicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(141.0, 190.0, 37.0, 37.0)];
indicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhite;
indicator.hidesWhenStopped = YES;
[[self tableView] addSubview:indicator];
But it appears as if the frame has no effect on the indicator. The indicator instead of displaying in the center of the table, appears in the navigation bar on the top left corner of the view.
I have no idea what is wrong with this and why this is happening. Can someone please help me out.
alt text http://www.freeimagehosting.net/uploads/95cbe49850.png
initWithFrame: is not the suggested method for creating a UIActivityInidcator. Taking a look at the API, you can see that to create a UIActivityIndicator, you should use
[[UIActivityIndicator alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
Then add it to your view and set its position with setCenter: as suggested by Pablo.
Also, adding it to a location in a table view will make it scroll with the table if the user scrolls up or down. If you put it in the table's superview instead, it will stay in place.
Try this:
activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)];
[activityIndicator setCenter:CGPointMake(160.0f, 208.0f)];
[activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];
[activityIndicator startAnimating];
Calling to setCenter should give the behavior you are expecting.
Good luck!