How to initialize NSString to NSMutableString?

Question

Is there any way to initialize NSString to NSMutableString? and also reverse order?

-(void)st:(NSString *)st
{
  NSMutableString str = st; // gives warning..         


        

Answer 1

You can set an NSMutableString to an NSString, but not the other way around

NSString *str =  [NSMutableString alloc]init];

is okay, but

NSMutableString *str = [[NSString alloc]init];

is not. This is because an NSMutableString is a subclass of NSString, so it 'is a' NSString. You can however create a mutable string from an NSString with

NSMutableString *mStr = [str mutableCopy];