对于NSMutableArray的Objective-C中的每个循环

Question

NSMutableArray *output = [[NSMutableArray alloc]init]; 

or

NSArray *output = [[NSMutableArray alloc]init];

I can set keys and values. Now, I just want to access each key and value, but I don't know the number of keys set.

In PHP it is very easy, something as follows:

foreach ($output as $key => $value)

How is it possible in Objective-C?

Answer 1

I think you are confused with NSDictionary with NSArray.

In NSDictionary you can set the object with the keys like

NSMutableDictionary *output = [[NSMutableDictionary alloc]init]; 
[yourDictionary setObject:@"yourvalue" forKey:@"yourKey"];

and you can get the object like

[yourDictionary objectForKey:@"yourKey"];

In your Array it just adds the object in the index.

NSArray * output = [[NSArray alloc] initWithObjects:@"option1",@"option2", nil];

get the object as

[output objectAtIndex:1];  // 1 is the index number