Question

I have a few line of code in viewwillappear method. I want to execute this code only once. How can i do this. However this code is inside a loop.

CALayer *myLayer = btn.layer;
myLayer.borderColor = [UIColor blackColor].CGColor;
myLayer.masksToBounds=NO;
myLayer.borderWidth = 2.0;
myLayer.shadowOffset = CGSizeMake(0, 3);
myLayer.shadowRadius = 10.0;
myLayer.shadowColor = [UIColor blackColor].CGColor;
myLayer.shadowOpacity = 1.0;

Answer 1

Declare a BOOL variable flag (or any name you like) in .h file. set it to NO in viewDidLoad method. In viewWillAppear method, have a check if this code is executed before:

for(---)
{
if(!flag)
 {
      //execute above lines of code
   flag = YES;
 }
}

just in last line, make its value YES.