UIProgressbar update method

Question

Hello i'm trying to write a method that update a UIProgressbar !

The problem is that when both of values arrive fine to the method (NSLog display values) the division operation generate a bad_access when i run the application !!

I tried many messages from both value like intValue/inValue ...

Help me to solve this issue and how can I print values of NSNumber

-(void)UpdateProgressbar:(NSNumber *)currentOperationNumer TotalOperationNumber:(NSNumber*)n
{
     NSLog(@" operation : %i",currentOperationNumer);
     NSLog(@" total : %i",n);

     if (currentOperationNumer<=n) 
     {
        [downloadBar setProgress:(currentOperationNumer/n )];
    NSLog(@"progress !");
     }
     else
     {
    [self.view removeFromSuperview];
     }
}

score 0 · Answer 1 · answered Sep 23 '11 at 10:38

try [currentOperationNumber intValue] in place of currentOperationNumber (or floatValue if setProgress expects a float). So....

int myProgress = [currentOperationNumber intValue] / [n intValue];
[downloadBar setProgress:myProgress];

Actually, isn't it a float value it expects in there?

score 0 · Answer 2 · answered Sep 23 '11 at 10:46

0

NSNumber is an object wrapper for various primitive types, with what you are doing you are trying to divide a pointer by a pointer..

maybe try chaining the code to..

[downloadBar setProgress:([currentOperationNumer intValue] / [n intValue])];

answered Sep 23 '11 at 10:46

steve

1

score 0 · Answer 3 · answered Sep 23 '11 at 10:53

You can print value by using following code

-(void)UpdateProgressbar:(NSNumber *)currentOperationNumer TotalOperationNumber:(NSNumber*)n
{
     NSLog(@" operation : %@",currentOperationNumer);
     NSLog(@" total : %@",n);

     if (currentOperationNumer<=n) 
     {
        [downloadBar setProgress:(currentOperationNumer/n )];
    NSLog(@"progress !");
     }
     else
     {
    [self.view removeFromSuperview];
     }
}

score 0 · Answer 4 · answered Sep 23 '11 at 18:34

The best way to debug EXC_BAD_ACCESS:

If you are not using XCode 4, then upgrade.
In XCode 4, press CMD-I to run Instruments.
Select the Zombies profile. (Background: EXC_BAD_ACCESS means you are sending a message to a deallocated object. Zombies turns on the zombie feature, so that objects with a retain count of 0 are not deallocated, but kept as a zombie. The NSZombie class raises an exception whenever a message is sent to it - thus it can be trapped, and identified the point of origin.)
Run your app via Instruments. When it crashes, Instruments will be brought to the foreground with a pop-up callout that indicates the memory that was freed but accessed.
You can click the little arrow in the lower right corner, this will give you that memory's alloc/retain/release history, and the code that performs the action. Click on the source column, it will take you to that line in the code.

XCode 3 was just too difficult to debug this way. 4 is worth the small hit you will have in learning curve on the new interface. — Jay Imerman, Sep 23 '11 at 18:35

score 0 · Answer 5 · answered Feb 06 '12 at 02:04

0

make it sure downloadBar.progress is a float and it's from 0.0 to 1.0 inclusive.

Please, try this:

float current = 0.0f; float count = 100.0f;

while (stuff..) { downloadBar.progress = current / count; }

it should work without problems.

answered Feb 06 '12 at 02:04

Rafael Sanches

1,823
21
28

UIProgressbar update method

5 Answers5