Objective-C中的基本字符串操作

Question

I have a method, which right now only needs to do an NSLog call:

(void)methodName:(NSString*)name {
    NSLog(@"hey there, %@", name);
}

It says " Local declaration of 'name' hides instance variable ". What does this mean? How do I construct the string I want?

Answer 1

Simply rename the argument:

-(void)methodName:(NSString*)nameParam {
   NSLog(@"hey there, %@", nameParam);
}

Answer 2

It means that you already have a variable called 'name' in your class that includes the methodName method. You might want to change it to look like this:

- (void)methodName:(NSString*)theName {
    NSLog(@"hey there, %@", theName);
}

Answer 3

You must be using name as a property or variable. Using it as a parameter name in a method is using it twice.

Change the name of your method parameter to something else.