NSScanner read only?

[itgiawa]

This code is works on the simulator but crashes on the device.

Here is a simplified example of the problem:

NSScanner* scanner = [NSScanner initWithString: source];

for(int i = 0; i < 2000; i++) 
{
       [scanner scanUpToString:@">" intoString:nil];
       [scanner scanString:@">" intoString:nil];
	source = [self upDateSource([scanner scanLocation]);  
     	scanner = [previewScanner initWithString:source];

}

The problem is that I'm allocating a new object after each iteration. Unfortunately there seems to be no way to simply update the string inside NSScanner...

Any ideas?