Databases
StackOverflow2013
Postsdbo
POObjective C, what [NSString initWithFormat] exactly does?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POObjective C, what [NSString initWithFormat] exactly does?
    primarykey
    data
    text
    <p>I just would like to know the difference between the line 1 and 2 bellow:</p> <pre><code>_subtitle = @"Test"; //Line 1 _subtitle = [NSString stringWithFormat: @"Test"]; //Line 2 </code></pre> <p>If I asked that question, it is because I got a problem by using MKAnnotation. In the method bellow, I try to update the subtitle delegate property of MKAnnotation (which is nonatomic, copy and readonly). But it's look like that I got a zombie when using the line 2 and nothing when using the line 1. So my question is why?</p> <pre><code>- (void) initCoordinateWithAddress:(NSString*)address; { self.address = address; CLGeocoder *geocoder = [[CLGeocoder alloc] init]; [geocoder geocodeAddressString: address completionHandler:^(NSArray *placemarks,NSError *error) { CLPlacemark *place = [placemarks objectAtIndex:0]; _coordinate = place.location.coordinate; _title = self.address; _subtitle = @"Test"; //Line 1: don't crash _subtitle = [NSString stringWithFormat: @"Test"]; //Line 2: crash //_subtitle = [[NSString stringWithFormat: @"[%.2f,%.2f]", self.coordinate.latitude, self.coordinate.longitude] copy]; _isInit = YES; [self.customDelegate didCalculateCoordinate: place.location.coordinate forAnnotation: self]; }]; </code></pre> <p>}</p> <p>I actually already fixed my problem by using the method copy, but I still not understand what is the difference between the line 1 and 2, if anyone can help me to understand what the difference is, I will appreciate.</p> <p>Edit: </p> <p>1- I am not using ARC</p> <p>2- _subtitle comes form @synthesize subtitle = _subtitle; And subtitle is a part of the MKAnnotation protocol, with the property nonatomic, readonly and copy</p> <p>Regards, Cyril</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCyril
    1. USCyril
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POObjective C, what [NSString initWithFormat] exactly does?
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POObjective C, what [NSString initWithFormat] exactly does?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI think this answer fits to the question: http://stackoverflow.com/a/4154419/883799
      singulars
      1. POObjective C, what [NSString initWithFormat] exactly does?
      1. USgeo
    2. COYou can check this nice answer : http://stackoverflow.com/questions/8275131/pros-and-cons-of-using-nsstring-stringwithstringsome-string-versus-some
      singulars
      1. POObjective C, what [NSString initWithFormat] exactly does?
      1. USNishant Tyagi
    3. COLast you are executing this code in a block, this can cause issues.
      singulars
      1. POObjective C, what [NSString initWithFormat] exactly does?
      1. USBen Coffman
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload