Array Question

aa233 · January 2011

Hello,
I am trying to figure out how to make an array start when another one stops on a certain image. So for example say I have three images in the first array, if the user stops the array and it lands on image 2, i want this to trigger another array. However, if a user stops the first array on image 1, the first array continues to play while the second one does not. Is there anyway I can do this? Thank you.

dany_dev · January 2011

An array doesn't start, so I not understand what you mean, just check your index, and if ==X use the 2nd array

aa233 · January 2011

dany88;294169 said:
An array doesn't start, so I not understand what you mean, just check your index, and if ==X use the 2nd array

-(IBAction)startClick:(id)sender {
stick.animationImages = [NSArray arrayWithObjects:
[UIImage imageNamed:@"red enemy.png"],
[UIImage imageNamed:@"yellow goal.png"],
[UIImage imageNamed:@"blue user.png"],nil];
[stick setAnimationRepeatCount:0];
stick.animationDuration = 1;
[stick startAnimating];
}

The button attached to startClick starts the array. I also have a button that stops the array. My question is, how would I make the array go faster after the user stops the array on a certain image?

aa233 · January 2011

Does anybody understand what I'm even asking for? This is what I have so far but I keep getting an error saying "expected identifier or "{" before 'if'

-(IBAction)startClick:(id)sender {
stick.animationImages = [NSArray arrayWithObjects:
[UIImage imageNamed:@"red enemy.png"],
[UIImage imageNamed:@"yellow goal.png"],
[UIImage imageNamed:@"blue user.png"],nil];
[stick setAnimationRepeatCount:0];
stick.animationDuration = 1;
[stick startAnimating];
}
-(IBAction)stopClick:(id)sender {
stick.animationImages = nil;
}
if ((stopClick == TRUE) && (stick.animationImages = UIImage imageNamed:@"yellow goal.png")) {
stick.animationImages = [NSArray arrayWithObjects:
[UIImage imageNamed:@"red enemy.png"],
[UIImage imageNamed:@"yellow goal.png"],
[UIImage imageNamed:@"blue user.png"],nil];
[stick setAnimationRepeatCount:0];
stick.animationDuration = .5;
[stick startAnimating];
}

Brandt · January 2011

Use a case statement depending on what image is selected to decrease the duration?

aa233 · January 2011

Brandt;294180 said:
Use a case statement depending on what image is selected to decrease the duration?

So by including a case statement, if the user clicks the stop button on a certain image, teh array will speed up?

Brandt · January 2011

Please use the code (#) tags. Try not to mix dot notation and blocked notation. Synthesizing automatically creates the setters and getters for you.


-(IBAction)startClick: (id)sender {
    stick.animationImages = [NSArray arrayWithObjects:
                                               [UIImage imageNamed:@\"red enemy.png\"],
                                               [UIImage imageNamed:@\"yellow goal.png\"],
                                               [UIImage imageNamed:@\"blue user.png\"],
                                               nil];
    [stick setAnimationRepeatCount:0];
    [stick setAnimationDuration:1];
    [stick startAnimating];
}

-(IBAction)stopClick: (id)sender {
    [stick setAnimationImages: nil];

    if ((stopClick == TRUE) && (stick.animationImages =                                
                                         UIImage imageNamed:@\"yellow goal.png\")) 
    {
        stick.animationImages = [NSArray arrayWithObjects:
        [UIImage imageNamed:@\"red enemy.png\"],
        [UIImage imageNamed:@\"yellow goal.png\"],
        [UIImage imageNamed:@\"blue user.png\"],nil];
        [stick setAnimationRepeatCount:0];
        [stick setAnimationDuration:0.5];
        [stick startAnimating];
    }
}

Now that your code is more readable let's look at it.

-You should be referring to your image by index number not by image name

aa233 · January 2011

Brandt;294186 said:

Please use the code (#) tags. Try not to mix dot notation and blocked notation. Synthesizing automatically creates the setters and getters for you.


-(IBAction)startClick: (id)sender {
    stick.animationImages = [NSArray arrayWithObjects:
                                               [UIImage imageNamed:@\"red enemy.png\"],
                                               [UIImage imageNamed:@\"yellow goal.png\"],
                                               [UIImage imageNamed:@\"blue user.png\"],
                                               nil];
    [stick setAnimationRepeatCount:0];
    [stick setAnimationDuration:1];
    [stick startAnimating];
}

-(IBAction)stopClick: (id)sender {
    [stick setAnimationImages: nil];

    if ((stopClick == TRUE) && (stick.animationImages =                                
                                         UIImage imageNamed:@\"yellow goal.png\")) 
    {
        stick.animationImages = [NSArray arrayWithObjects:
        [UIImage imageNamed:@\"red enemy.png\"],
        [UIImage imageNamed:@\"yellow goal.png\"],
        [UIImage imageNamed:@\"blue user.png\"],nil];
        [stick setAnimationRepeatCount:0];
        [stick setAnimationDuration:0.5];
        [stick startAnimating];
    }
}

Now that your code is more readable let's look at it.

-You should be referring to your image by index number not by image name

Firstly, thanks for the tip on posting the code, I've been trying to figure that out. Secondly, I'm a novice at programming so i'm not exactly sure if an index number is automatically generated or not. What would i need to do if all i wanted was to speed up the array every time the user clicks stop when the array is on the "yellow goal"?
Thanks for your patience by the way

Brandt · January 2011

Read the NSArray Class Reference

You should probably use the objectAtIndex...Index numbers in an array start at 0.

Brandt · January 2011

Also, don't reinstantiate the array every time a button is pushed...it looks like a static array so NSArray is correct, but declare it in your header file and define it in your implementation file so it is available to all your methods

aa233 · January 2011

In my game I have an animation via an array, and every time the user clicks a button, if the array is on a certain image, i want the array to start over and speed up. Here is what I have so far. I keep getting an error saying "expected expression before 'UIImage'" Sorry I needed to clarify myself. What's wrong with this code?

#-(IBAction)startClickid)sender {
stick.animationImages = [NSArray arrayWithObjects:
[UIImage imageNamed:@"red enemy.png"],
[UIImage imageNamed:@"yellow goal.png"],
[UIImage imageNamed:@"blue user.png"],nil];
[stick setAnimationRepeatCount:0];
stick.animationDuration = 1;
[stick startAnimating];
}

- (IBAction)Fasterid)sender {
if (UIImage = @"yellow goal.png") {
stick.animationDuration = .5;
}
}#

aa233 · January 2011

I keep toying around and cannot do anything about this error message. I'm guessing its something small but I can't figure out what. This is the updated code:

- (IBAction)Faster:(id)sender {
if (UIImage = [@"yellow goal.png"] {
stick.animationDuration = .5;
else {
stick.animationDuration = 1;
}

}
}
The error messages now say expected expression before 'UIImage' and expected expression before '}' token (in reference to the third bracket)

dljeffery · January 2011

aa233;294260 said:
I keep toying around and cannot do anything about this error message. I'm guessing its something small but I can't figure out what. This is the updated code:

- (IBAction)Faster:(id)sender {
if (UIImage = [@"yellow goal.png"] {
stick.animationDuration = .5;
else {
stick.animationDuration = 1;
}

}
}
The error messages now say expected expression before 'UIImage' and expected expression before '}' token (in reference to the third bracket)

The symptom is small, but the issue is much larger. Start here:

Objective-C Introduction

Brandt · January 2011

Please use the code tags, it is the hash button on the rich text editor.

or manually
[ C O D E ]

[ / C O D E ]

remove the spaces

define the array in viewDidLoad or viewWillLoad

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