iOS iPhone app development question

[gizabo]

i have two questions

1) I need help saving my int variable into a plist and be able to read it out of the plist. How do i do that?

2) I have an image of a big red X (to symbolize you got something wrong) and a big green check mark ( to symbolize that you got something right). How do i make it so i can turn the image on or off?

thanks

 

[gizabo]

can someone please help?

 

[BlackWolf]

1) best thing is to use NSUserDefaults. use setInteger:forKey: to set it and integerForKey: to get it

2) just use the hidden property every UIView has. set it to YES to hide it or NO to show it

 

[gizabo]

so like this?

[prefs setObject::highScore forKey:@"highScore"];

Note: highScore is an int, so when i write highscore here

[prefs setObject::highScore forKey"highScore"];

is that saying set the variable?

and is "highScore" in the quotes the name in which i call it?

 

[BlackWolf]

so like this?

[prefs setObject::highScore forKey:@"highScore"];

Note: highScore is an int, so when i write highscore here

is that saying set the variable?

and is "highScore" in the quotes the name in which i call it?

you should take a look at how NSUserDefaults, NSDictionary or .plist themselves work. they are basic key-value-pairs. some stuff is wrong about your code

1) why two :'s - one is enough. guess it's just a typo
2) like you said yourself - highScore is an int. int's are not objects. so you must use setInteger:forKey: rather than setObject:forKey:
3) key-value-pair means you have a key, and with that key you can "talk" to the value that is assigned to that key. so yes, "highScore" is a string that is used to call your stored value afterwards with NSUserDefaults integerForKey: method

you should read some of the basics again I guess btw! "highScore in quotes" makes me believe you don't know what a string is - and you should definetly know that. just my impression, no offense

 

[gizabo]

no affence taken , and i am fairley new at this

And i do know what a string was, i was just trying ot explain it easier sorry

hhhmm something is weird... Why are these giving me errors?

- (void)awakeFromNib {
	highScore = [prefs integerForKey:@"highScore"];
	srandom(time(NULL));
	[self setLevel:1 withMessage:nil];
}

if (level > highScore) {
		highScore = level;
		[scoreLabel setText:[NSString stringWithFormat:@"High Score: %i", highScore]];
		[prefs setInteger:forKey:highScore forKey:@"highScore"];
	}
	
	
}

 

[gizabo]

i get these errors

error: 'prefs' undeclared (first use in function)
error: 'forKey' undeclared (first use in function)

 

[CocoaPuffs]

Pick up a book and read it. At this rate, Apple will release 4.0 before you figure out how to write into plist.

 

[dejo]

1) Where and how is prefs declared?

2)

[prefs setInteger:forKey:highScore forKey:@"highScore"];

Do you see anything immediately wrong with that?

 

[gizabo]

lmao omg im an idiot sorry

ok i fixed it

if (level > highScore) {
		highScore = level;
		[scoreLabel setText:[NSString stringWithFormat:@"High Score: %i", highScore]];
		[prefs setInteger:highScore forKey:@"highScore"];
	}

but im still getting an error

error: initializer element is not constant

 

[eddietr]

but im still getting an error

Sounds like you're trying to do something in global scope. Can you post your code?

 

[gizabo]

here

Btw, thanks for helping me guys

#import "DoorsViewController.h"
@implementation DoorsViewController


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
    // Release anything that's not essential, such as cached data
}


- (void)dealloc {
    [super dealloc];
}

- (void)awakeFromNib {
	highScore = [prefs integerForKey:@"highScore"];
	srandom(time(NULL));
	[self setLevel:1 withMessage:nil];
}

- (IBAction)clickDoor:(id)sender {
	int correctDoor = random() % 3 + 1;
	
	if(correctDoor == [sender tag])
		
		[self setLevel:level + 1 withMessage:[NSString stringWithFormat:@"You passed! Welcome to level %i!", level + 1]];
	
	else {
		[self setLevel:1 withMessage:[NSString stringWithFormat:@"Sorry, you failed! The correct door was door #%i!", correctDoor]];
		wrongCount++;
		[wrong setText:[NSString	stringWithFormat:@"In this session you have gotten %d wrong", wrongCount]];
	}
}


- (void)setLevel:(int)newLevel withMessage:(NSString *)message {
	level = newLevel;
	[self setTitle:[NSString stringWithFormat:@"Level %i", level]];
	
	if (message)
		[successLabel setText:message];	
	
	if (level > highScore) {
		highScore = level;
		[scoreLabel setText:[NSString stringWithFormat:@"High Score: %i", highScore]];
		[prefs setInteger:highScore forKey:@"highScore"];
	}
	
	
}

- (IBAction)resetDoor:(id)sender
{
	level = 1;
	wrongCount = 0;
	[self setTitle:[NSString stringWithFormat:@"Level %i", level]];
	[wrong setText:[NSString stringWithFormat:@"In this session you have gotten %d wrong", wrongCount]];
}

@end

#import <UIKit/UIKit.h>

@interface DoorsViewController : UIViewController {
	int level;
	int highScore;
	int wrongCount;
	
	IBOutlet UILabel *scoreLabel;
	IBOutlet UILabel *successLabel;
	IBOutlet UILabel *wrong;
	

}

- (IBAction)resetDoor:(id)sender;
- (IBAction)clickDoor:(id)sender;
- (void)setLevel:(int)newLevel withMessage:(NSString *)message;
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];


@end

 

[dejo]

Your prefs declaration is not in the correct place.

 

[BlackWolf]

you should look at how the interface looks in objective-c 2.0 ...

#import <UIKit/UIKit.h>

@interface MainViewController : UIViewController <UIActionSheetDelegate> {
	UILabel *label;
	UIButton *button;
	UIActivityIndicatorView *activityIndicator;
	UISlider *speedSlider;
	UISwitch *directionSwitch;
	UIButton *resetButton;
	NSTimer *timer;
	NSUserDefaults *defaults;
}

@property (nonatomic, retain) IBOutlet UILabel *label;
@property (nonatomic, retain) IBOutlet UIButton *button;
@property (nonatomic, retain) IBOutlet UIActivityIndicatorView *activityIndicator;
@property (nonatomic, retain) IBOutlet UISlider *speedSlider;
@property (nonatomic, retain) IBOutlet UISwitch *directionSwitch;
@property (nonatomic, retain) IBOutlet UIButton *resetButton;
@property (nonatomic, retain) NSTimer *timer;
@property (nonatomic, retain) NSUserDefaults *defaults;

-(IBAction)buttonClicked:(id)sender;
-(void)countUpwards;
-(IBAction)resetButtonClicked:(id)sender;
-(IBAction)newSpeed:(id)sender;

@end

... at least that's how I learned it, hope it's not wrong