Why does UIProgressView not update?

Question

I'm trying to set the progress of a UIProgressView, but the progressView doesn't "update". Why? Do you know what I am doing wrong?

Here is my code in ViewController.h:

    IBOutlet UIProgressView *progressBar;

That's the code in ViewController.m:

- (void)viewDidLoad
{
[super viewDidLoad];

progressBar.progress = 0.0;

[self performSelectorOnMainThread:@selector(progressUpdate) withObject:nil waitUntilDone:NO];


}

-(void)progressUpdate {

float actual = [progressBar progress];
if (actual < 1) {
    progressBar.progress = actual + 0.1;
    [NSTimer scheduledTimerWithTimeInterval:1.0 target:self `selector:@selector(progressUpdate) userInfo:nil repeats:NO];`
}
else {

}

}

I think you forgot to set `repeat` to `YES`. [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(progressUpdate) userInfo:nil repeats:YES]; — Paresh Navadiya, Jan 04 '13 at 10:22
@Prince: no he don't, because he is repeatedly calling the same method. It'll again creating a timer, so no need to set the timer repeat to yes. — Midhun MP, Jan 04 '13 at 10:36

score 2 · Answer 1 · edited May 23 '17 at 11:58

2

Try calling [progressBar setProgress:<value> animated:YES]; instead of progressBar.progress = <value>

EDIT: Take a look at this, which looks a lot like your example: Objective c : How to set time and progress of uiprogressview dynamically?

edited May 23 '17 at 11:58

Community

1
1

answered Jan 04 '13 at 10:23

OlavJ

365
4
9

Zachary Christopoulos · Answer 2 · 2013-01-04T10:43:56.520

1

Double check that progressBar is linked correctly in Interface Builder.

If it still doesn't work, try using [progressBar setProgress:0]; and [progressBar setProgress:actual+0.1];.

Also know that the UIProgressView has a [progressBar setProgress:<value> animated:YES]; method. May look cleaner.

edited Jan 04 '13 at 10:43

answered Jan 04 '13 at 10:24

Zachary Christopoulos

643
1
5
18

He is repeatedly calling the same method. It'll again creating a timer, so no need to set the timer repeat to yes. – Midhun MP Jan 04 '13 at 10:36
What does "linked correctly" mean for you?? The same like for other outlets(textfields, labels, buttons...)?? – user1940136 Jan 04 '13 at 13:24
Exactly! You can't modify an object in the Interface Builder if it isn't linked to the object ;). – Zachary Christopoulos Jan 04 '13 at 19:36

score 1 · Answer 3 · answered Aug 07 '13 at 10:28

Its should look like this:

- (void)viewDidLoad
{
    [super viewDidLoad];
    progressBar.progress = 0.0;
    [self performSelectorInBackground:@selector(progressUpdate) withObject:nil];
}

-(void)progressUpdate {
    for(int i = 0; i<100; i++){
        [self performSelectorOnMainThread:@selector(setProgress:) withObject:[NSNumber numberWithFloat:(1/(float)i)] waitUntilDone:YES];   
    }
}

- (void)setProgress:(NSNumber *)number
{
   [progressBar setProgress:number.floatValue animated:YES];
}

score 0 · Answer 4 · answered Dec 09 '14 at 15:18

I had the same problem this morning. It appeared that the progressBar was partly over a UITableView. I moved it a little, so that it was not overlapping anymore.

I'm not sure why this is. It should have been working in the original case, but that is how I solved it.

Why does UIProgressView not update?

4 Answers4