CODEWITHSUNDEEP
iphoneobjective-ciosios4ios5
Whoami
Whoami

Reputation: 14428

UILabel not able to update the label text

i am new to ios. I have a viewController, where in there is a notification observer. For example

-(void) myNotificationObFn:(Notification *)noti
{
  /* Here i am trying to change the text of UILabel, which is not working. 
  ie:
    NSString *ns = [NSString stringWithFormat:@"%d", 10];
    mylabel.text = ns;
  */
}

How can i resolve this issue ?

Upvotes: 0

Views: 1552

Answers (3)

Tsutomu Aoki
Tsutomu Aoki

Reputation: 31

-(void) myNotificationObFn:(Notification *)noti
{
    dispatch_sync(dispatch_get_main_queue(), ^{
        NSString *ns = [NSString stringWithFormat:@"%d", 10];
        labelfromtag.text = ns;
        [labelfromtag setNeedDisplay];
   });
}

Upvotes: 3

Yonathan Jm
Yonathan Jm

Reputation: 442

try using the tag function if you want to change the label

examples :

if you create the label programmatically, set the tag of your label after you create it for the first time

UILabel *myLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
[myLabel setTag:1234];

if you create the label in your XIB or storyboard, just change the "tag" field

this way, your label get a tag "1234"

after this, if you need to edit this label , on your notification method put this code

UILabel *labelfromtag = (UILabel*)[self.view viewWithTag:1234]; //this code direct label "labelfromtag" to your "myLabel", so your new label here is actually your old label
NSString *ns = [[NSString alloc] initWithFormat:@"%d", 10];

labelfromtag.text = ns;

good luck :]

edit : also, is this notification reside in the same class / controller as ur UILabel?

Upvotes: 1

Joel
Joel

Reputation: 16134

1 - Is your label properly wired up in IB? Can you change the text somewhere else in your code (say viewDidLoad for example)?

2 - You don't need to alloc the string since you are not retaining it outside the scope of this method. You can just do:

[myLabel setText:[NSString stringWithFormat:@"%d",10]];

Upvotes: 0

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