received memory warning. level 1

I am new to iPhone development. I am creating an application in which i need to create buttons and labels programmatically.

So I am doing this in .h file

@interface FirstQuizViewControlleriPad : UIViewController{

IBOutlet UIButton *startgame;
UILabel *theQuestion;
IBOutlet UIScrollView *scrollview;
UILabel *Question;
UILabel *Description;
UIView *ContainerView;
UILabel *Challengetext;
UIImageView *img1;
UIImageView *img2;
UIImageView *background;
IBOutlet UIButton *reviewbtn;
UILabel *ans1;
UILabel *ans2;
UILabel *ans3;
UILabel *ans4;

UIButton *button;
UIButton *button2;
UIButton *button3;
UIButton *button4;
UILabel *rightans;
UILabel *theScore;
UIButton *nextbtn;
UIButton *backbtn;
NSString *setchallange;

AVAudioPlayer *AVback;
AVAudioPlayer *AVstart;
NSArray *theQuiz;
NSInteger questionNumber;
NSInteger rightAnswer;
NSInteger myScore;
NSInteger finalScoreipad1;
BOOL restartGame;
id QuestionReview;

}

@property (retain , nonatomic) IBOutlet UIButton *startgame;
@property (retain , nonatomic) NSArray *theQuiz;
@property (retain , nonatomic) IBOutlet UILabel *theScore;
@property (retain , nonatomic) IBOutlet UIButton *nextbtn;
@property (retain , nonatomic) IBOutlet UIScrollView *scrollview;
@property (retain , nonatomic) IBOutlet UIButton *backbtn;
@property (retain , nonatomic) IBOutlet UILabel *Challengetext;
@property (retain , nonatomic) IBOutlet UIImageView *img1;
@property (retain , nonatomic) IBOutlet UIImageView *img2;
@property (retain , nonatomic) id QuestionReview;
@property (retain , nonatomic) IBOutlet UIButton *reviewbtn;
@property (retain ,nonatomic) IBOutlet UIButton *button;
@property (retain ,nonatomic) IBOutlet UIButton *button2;
@property (retain ,nonatomic) IBOutlet UIButton *button3;
@property (retain ,nonatomic) IBOutlet UIButton *button4;
@property (retain ,nonatomic) IBOutlet UILabel *ans1;
@property (retain ,nonatomic) IBOutlet UILabel *ans2;
@property (retain ,nonatomic) IBOutlet UILabel *ans3;
@property (retain ,nonatomic) IBOutlet UILabel *ans4;
@property (retain , nonatomic) IBOutlet UILabel *Question;
@property (retain , nonatomic) NSString *setchallange;

-(void)askQuestion;

in .m file

questionNumber = questionNumber + 1;
NSInteger row = 0;
if(questionNumber == 1)
{
    row = questionNumber - 1;
}
else
{
    row = ((questionNumber - 1) * 10);
}

NSString *selected = [theQuiz objectAtIndex:row];
NSString *activeQuestion = [[NSString alloc] initWithFormat:@"%@", selected];
QuestionReview = activeQuestion;

//lbl ref to btn1
ans1 = [[[UILabel alloc] initWithFrame:CGRectMake(36, 292, 697, 100)] autorelease];
ans1.numberOfLines = 0;
ans1.font = [UIFont systemFontOfSize:26];
ans1.text = [theQuiz objectAtIndex:row+1];
ans1.lineBreakMode = UILineBreakModeWordWrap;
[ans1 sizeToFit];
[self.view addSubview:ans1];
//lbl ref to btn2
ans2 = [[[UILabel alloc] initWithFrame:CGRectMake(36, 312 + ans1.frame.size.height , 697, 100)] autorelease];
ans2.numberOfLines = 0;
ans2.font = [UIFont systemFontOfSize:26];
ans2.text = [theQuiz objectAtIndex:row+2];
ans2.lineBreakMode = UILineBreakModeWordWrap;
[ans2 sizeToFit];
[self.view addSubview:ans2];
//lbl ref to btn3
ans3 = [[[UILabel alloc] initWithFrame:CGRectMake(36 ,332 + ans1.frame.size.height + ans2.frame.size.height , 697 , 100)] autorelease];
ans3.numberOfLines = 0;
ans3.font = [UIFont systemFontOfSize:26];
ans3.text = [theQuiz objectAtIndex:row+3] ;
ans3.lineBreakMode = UILineBreakModeWordWrap;
[ans3 sizeToFit];
[self.view addSubview:ans3];
//lbl ref to btn4
ans4 = [[[UILabel alloc] initWithFrame:CGRectMake(36, 352 + ans1.frame.size.height + ans2.frame.size.height + ans3.frame.size.height, 697, 100)] autorelease];
ans4.numberOfLines = 0;
ans4.font = [UIFont systemFontOfSize:26];
ans4.text = [theQuiz objectAtIndex:row+4];
ans4.lineBreakMode = UILineBreakModeWordWrap;
[ans4 sizeToFit];
[self.view addSubview:ans4];

rightAnswer = [[theQuiz objectAtIndex:row+5] intValue];

Question = [[[UILabel alloc] initWithFrame:CGRectMake(22, 130, 725, 160)] autorelease];
Question.numberOfLines = 0;
//Question.font = [UIFont systemFontOfSize:27];
Question.text = activeQuestion;
Question.lineBreakMode = UILineBreakModeWordWrap;
[Question setFont:[UIFont fontWithName:@"Futura" size:26]];
Question.backgroundColor = [UIColor clearColor];
[Question sizeToFit];
[self.view addSubview:Question];

//For 1st Option.
button = [UIButton buttonWithType:UIButtonTypeCustom];
[button addTarget:self 
           action:@selector(buttonOne)
 forControlEvents:UIControlEventTouchDown];
button.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
button.titleLabel.font = [UIFont systemFontOfSize:24];
[button setTitle:[theQuiz objectAtIndex:row+1] forState:UIControlStateNormal];
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
button.frame = CGRectMake(34, 200 + Question.frame.size.height , 700, ans1.frame.size.height + 20);
[self.view addSubview:button];
button.layer.borderWidth = 3;
button.layer.borderColor = [[UIColor purpleColor ] CGColor];
button.layer.cornerRadius = 10.0;
[button setBackgroundImage:[UIImage imageNamed:@"buttun.png"] forState:UIControlStateNormal];
button.titleEdgeInsets = UIEdgeInsetsMake(5, 5, 5, 5);

//For 2nd Option.
button2 = [UIButton buttonWithType:UIButtonTypeCustom];
[button2 addTarget:self 
            action:@selector(buttonTwo)
  forControlEvents:UIControlEventTouchDown];
[button2 setTitle:[theQuiz objectAtIndex:row+2] forState:UIControlStateNormal];
[button2 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
button2.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
button2.titleLabel.font = [UIFont systemFontOfSize:24];
button2.frame = CGRectMake(34, 230 + Question.frame.size.height + button.frame.size.height , 700, ans2.frame.size.height + 20);
button2.layer.borderWidth = 3;
button2.layer.borderColor = [[UIColor darkGrayColor ] CGColor];
button2.layer.cornerRadius = 10.0;
[self.view addSubview:button2];
[button2 setBackgroundImage:[UIImage imageNamed:@"buttun2.png"] forState:UIControlStateNormal];
button2.titleEdgeInsets = UIEdgeInsetsMake(5, 5, 5, 5);

//For 3rd Option.
button3 = [UIButton buttonWithType:UIButtonTypeCustom];
[button3 addTarget:self 
            action:@selector(buttonThree)
  forControlEvents:UIControlEventTouchDown];
[button3 setTitle:[theQuiz objectAtIndex:row+3] forState:UIControlStateNormal];
[button3 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
button3.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
button3.titleLabel.font = [UIFont systemFontOfSize:24];
button3.frame = CGRectMake(34, 260 + Question.frame.size.height + button.frame.size.height + button2.frame.size.height , 700, ans3.frame.size.height + 20);
button3.layer.borderWidth = 3;
button3.layer.borderColor = [[UIColor purpleColor ] CGColor];
button3.layer.cornerRadius = 10.0;

[self.view addSubview:button3];
[button3 setBackgroundImage:[UIImage imageNamed:@"buttun.png"] forState:UIControlStateNormal];
button3.titleEdgeInsets = UIEdgeInsetsMake(5, 5, 5, 5);

//For 4th Option.
button4 = [UIButton buttonWithType:UIButtonTypeCustom];
[button4 addTarget:self 
            action:@selector(buttonFour)
  forControlEvents:UIControlEventTouchDown];
[button4 setTitle:[theQuiz objectAtIndex:row+4] forState:UIControlStateNormal];
[button4 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
button4.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
button4.titleLabel.font = [UIFont systemFontOfSize:24];
button4.frame = CGRectMake(34, 290 + Question.frame.size.height + button.frame.size.height + button2.frame.size.height + button3.frame.size.height , 700, ans4.frame.size.height + 20);
button4.layer.borderWidth = 3;
button4.layer.borderColor = [[UIColor darkGrayColor ] CGColor];
button4.layer.cornerRadius = 10.0;
[self.view addSubview:button4];
[button4 setBackgroundImage:[UIImage imageNamed:@"buttun2.png"] forState:UIControlStateNormal];
button4.titleEdgeInsets = UIEdgeInsetsMake(5, 5, 5, 5);

NSString *strright = [theQuiz objectAtIndex:row+7];
NSString *strtext = [[NSString alloc] initWithFormat:@"%@" , strright];

rightans = [[UILabel alloc] initWithFrame:CGRectMake(50, 330, 650, 150)];
rightans.numberOfLines = 0;
rightans.text = strtext;
rightans.backgroundColor = [UIColor clearColor];
rightans.font = [UIFont systemFontOfSize:26];
[self.view addSubview:rightans];
[rightans sizeToFit];
[rightans setHidden:YES];

//Description.
NSString *des = [theQuiz objectAtIndex:row+6];
NSString *destext = [[NSString alloc] initWithFormat:@"\n> Explanation :\n%@\n\n" , des];

Description = [[[UILabel alloc] initWithFrame:CGRectMake(40, 400 + rightans.frame.size.height , 690, 150)] autorelease];
Description.numberOfLines = 0;
// Description.font = [UIFont systemFontOfSize:13.5];
Description.text = destext;
[Description setFont:[UIFont fontWithName:@"Futura" size:26]];
Description.lineBreakMode = UILineBreakModeWordWrap;
Description.backgroundColor = [UIColor clearColor];
[Description sizeToFit];
[self.view addSubview:Description];
[Description setHidden:YES];


ContainerView = [[UIView alloc] initWithFrame:CGRectMake(30, 400 + rightans.frame.size.height , 700 ,Description.frame.size.height)];
ContainerView.backgroundColor = [UIColor clearColor];
ContainerView.layer.cornerRadius = 10.0;
ContainerView.layer.borderColor = [[UIColor grayColor] CGColor];
ContainerView.layer.borderWidth = 3;
// [ContainerView addSubview:Description];
[self.view addSubview:ContainerView];
[ContainerView setHidden:YES];

//For Challenge Text
NSString *challange = [theQuiz objectAtIndex:row开发者_Python百科+8];
  setchallange = [[NSString alloc] initWithFormat:@"%@" , challange];//Memory leak here
 Challengetext.text = setchallange;



//Image For Every Challenge
background = [[[UIImageView alloc] initWithFrame:CGRectMake(15.0f, 15.0f, 130.0f, 110.0f)] autorelease];
[background setImage:[UIImage imageNamed:[theQuiz objectAtIndex: row + 9]]];
[self.view addSubview:background];

In dealloc function , I release all the labels and buttons and other objects that i have created but still i got this warning for memory leakage (received memory warning level 1 and some times level 2)

I searched where my memory is being leaked and it is leak at NSString setchallenge

Please help me out this..

Any help will be appreciated..

Thanks..

You're creating a new string with every call to setchallenge = [[NSString alloc]....

Should be:

//For Challenge Text
NSString *challange = [theQuiz objectAtIndex:row+8];
Challengetext.text = [NSString stringWithFormat:@"%@" , challange];

stringWithFormat returns an auto-released string, which will get deallocated next time the auto-release pool is drained.

joe

Since you alloced memory, you need to release it as well. Anytime you use alloc, copy or new, remember to always release. Its not a good idea to release everything only at dealloc. Release objects when you are done with them. For example:

 setchallange = [[NSString alloc] initWithFormat:@"%@" , challange];//Memory leak here
 Challengetext.text = setchallange;
 [setchallange release]

Also checkout out the iOS memory management guide. I'm sure it will help.

May be for some object you allocating more than one times and release it once. just check it out I hope it will be solve.