Abfragen über ViewDidLoad

Question

Ich habe gehört, dass viewDidLoad() Methode mehrmals während der Ausführung des Codes aufgerufen wird..so wenn ich alloc einige Ansichten in dieser Methode, Es wird eine neue pointer jedes Mal erstellen, wenn es aufgerufen wird, ohne sie zu veröffentlichen.

hier ist meine Methode

-(void)viewDidLoad() 
[b1 release]; 
[b2 release]; 
[b3 release]; 
[b4 release]; 
[b5 release]; 
[b6 release]; 
[b7 release]; 
[s1 release]; 
[s2 release]; 
[s3 release]; 
[s4 release]; 
[s5 release]; 
[s6 release]; 
[s7 release]; 

[bg release]; 
[bgview release]; 
[player release]; 

window = [[UIImageView alloc]initWithFrame:CGRectMake(0,0, 1026, 768)]; 
[window setImage:[UIImage imageNamed:@"backgrd99.png"]]; 
[self.view addSubview:window]; 

tree1 = [[UIImageView alloc]initWithFrame:CGRectMake(860,100,258,543)]; 
[tree1 setImage:[UIImage imageNamed:@"moving trees1.png"]]; 
[self.view addSubview:tree1]; 
//[tree1 release]; 

/*tree2 = [[UIImageView alloc]initWithFrame:CGRectMake(860,200,327,521)]; 
[tree2 setImage:[UIImage imageNamed:@"moving trees00010001.png"]]; 
[self.view addSubview:tree2]; 
[tree2 release];*/ 

bg = [[UIImageView alloc]initWithFrame:CGRectMake(-1,-1, 1026, 768)]; 
[bg setImage:[UIImage imageNamed:@"room99.png"]]; 
[self.view addSubview:bg]; 

bgsofa =[[UIImageView alloc]initWithFrame:CGRectMake(-1,-1 
                , 1026, 768)]; 
[self.view addSubview:bgsofa]; 

bgview = [[UIView alloc]initWithFrame:CGRectMake(230, 358, 80, 68)]; 
//[bgview setBackgroundColor:[UIColor cyanColor]]; 
[self.view addSubview:bgview]; 

bgview1 = [[UIView alloc]initWithFrame:CGRectMake(500,100, 500,200)]; 
//[bg setBackgroundColor:[UIColor greenColor]]; 
[self.view addSubview:bgview1]; 


sofapattelview =[[UIView alloc]initWithFrame:CGRectMake(530, 20, 440, 97)]; 
[sofapattelview setBackgroundColor:[UIColor blackColor]]; 
[self.view addSubview:sofapattelview]; 

sofapattelimg =[[UIImageView alloc]initWithFrame:CGRectMake(0,0, 440, 97)]; 
[sofapattelimg setImage:[UIImage imageNamed:@"sofa-button1.png"]]; 
[sofapattelview addSubview:sofapattelimg]; 
// create the view that will execute our animation 
/*colorbt =[UIButton buttonWithType:UIButtonTypeRoundedRect ]; 
colorbt.frame = CGRectMake(50, 50, 100, 50); 
[colorbt setTitle:@"Paint" forState:UIControlStateNormal]; 
[colorbt addTarget:self action:@selector(pop) forControlEvents:UIControlEventTouchUpInside]; 
[self.view addSubview:colorbt];*/ 

pattel = [[UIView alloc]initWithFrame:CGRectMake(58, 20, 440, 97)]; 
[pattel setBackgroundColor:[UIColor blackColor]]; 
[self.view addSubview:pattel]; 

pattelimg =[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 440, 97)]; 
[pattelimg setImage:[UIImage imageNamed:@"paint-button.png"]]; 
[pattel addSubview:pattelimg]; 

b1 =[[UIButton alloc] initWithFrame:CGRectMake(15, 33, 53, 51)]; 
[b1 addTarget:self action:@selector(B1) forControlEvents:UIControlEventTouchUpInside]; 
//[b1 setBackgroundColor:[UIColor cyanColor]]; 
[pattel addSubview:b1]; 

b2 =[[UIButton alloc] initWithFrame:CGRectMake(75, 33, 53, 51)]; 
[b2 addTarget:self action:@selector(B2) forControlEvents:UIControlEventTouchUpInside]; 
//[b2 setBackgroundColor:[UIColor cyanColor]]; 
[pattel addSubview:b2]; 

b3 =[[UIButton alloc] initWithFrame:CGRectMake(137, 33, 53, 51)]; 
[b3 addTarget:self action:@selector(B3) forControlEvents:UIControlEventTouchUpInside]; 
//[b3 setBackgroundColor:[UIColor cyanColor]]; 
[pattel addSubview:b3]; 

b4 =[[UIButton alloc] initWithFrame:CGRectMake(196, 33, 53, 51)]; 
[b4 addTarget:self action:@selector(B4) forControlEvents:UIControlEventTouchUpInside]; 
//[b4 setBackgroundColor:[UIColor cyanColor]]; 
[pattel addSubview:b4]; 

b5 =[[UIButton alloc] initWithFrame:CGRectMake(257, 33, 53, 51)]; 
[b5 addTarget:self action:@selector(B5) forControlEvents:UIControlEventTouchUpInside]; 
//[b5 setBackgroundColor:[UIColor cyanColor]]; 
[pattel addSubview:b5]; 

b6 =[[UIButton alloc] initWithFrame:CGRectMake(318, 33, 53, 51)]; 
[b6 addTarget:self action:@selector(B6) forControlEvents:UIControlEventTouchUpInside]; 
//[b6 setBackgroundColor:[UIColor cyanColor]]; 
[pattel addSubview:b6]; 

b7 =[[UIButton alloc] initWithFrame:CGRectMake(377, 33, 53, 51)]; 
[b7 addTarget:self action:@selector(B7) forControlEvents:UIControlEventTouchUpInside]; 
//[b7 setBackgroundColor:[UIColor cyanColor]]; 
[pattel addSubview:b7]; 


s1 =[[UIButton alloc] initWithFrame:CGRectMake(15, 33, 53, 51)]; 
[s1 addTarget:self action:@selector(S1) forControlEvents:UIControlEventTouchUpInside]; 
//[s1 setBackgroundColor:[UIColor blackColor]]; 
[sofapattelview addSubview:s1]; 

s2 =[[UIButton alloc] initWithFrame:CGRectMake(75, 33, 53, 51)]; 
[s2 addTarget:self action:@selector(S2) forControlEvents:UIControlEventTouchUpInside]; 
//[s2 setBackgroundColor:[UIColor blackColor]]; 
[sofapattelview addSubview:s2]; 

s3 =[[UIButton alloc] initWithFrame:CGRectMake(137, 33, 53, 51)]; 
[s3 addTarget:self action:@selector(S3) forControlEvents:UIControlEventTouchUpInside]; 
//[s3 setBackgroundColor:[UIColor blackColor]]; 
[sofapattelview addSubview:s3]; 

s4 =[[UIButton alloc] initWithFrame:CGRectMake(196, 33, 53, 51)]; 
[s4 addTarget:self action:@selector(S4) forControlEvents:UIControlEventTouchUpInside]; 
//[s4 setBackgroundColor:[UIColor blackColor]]; 
[sofapattelview addSubview:s4]; 

s5 =[[UIButton alloc] initWithFrame:CGRectMake(257, 33, 53, 51)]; 
[s5 addTarget:self action:@selector(S5) forControlEvents:UIControlEventTouchUpInside]; 
//[s5 setBackgroundColor:[UIColor blackColor]]; 
[sofapattelview addSubview:s5]; 

s6 =[[UIButton alloc] initWithFrame:CGRectMake(318, 33, 53, 51)]; 
[s6 addTarget:self action:@selector(S6) forControlEvents:UIControlEventTouchUpInside]; 
//[s6 setBackgroundColor:[UIColor blackColor]]; 
[sofapattelview addSubview:s6]; 

s7 =[[UIButton alloc] initWithFrame:CGRectMake(377, 33, 53, 51)]; 
[s7 addTarget:self action:@selector(S7) forControlEvents:UIControlEventTouchUpInside]; 
//[s7 setBackgroundColor:[UIColor blackColor]]; 
[sofapattelview addSubview:s7]; 

FileURL = [[NSURL alloc]initFileURLWithPath:[[NSBundle mainBundle]pathForResource:@"Sunny" ofType:@"aac"]]; 
player = [[AVAudioPlayer alloc]initWithContentsOfURL:FileURL error:nil]; 

//[changecolor setAlpha:0.0]; 
[campFireView setAlpha:0.1]; 
[bgview setAlpha:1]; 
[self.view addSubview:toolbar]; 
} 

meine App noch stürzen auch nach jedem Zeiger i alloc kümmert ??

jus will wissen, ob dieser Ansatz richtig ist oder nicht ??

Answer 1

viewDidLoad kann tatsächlich mehrmals aufgerufen werden, wenn das System die Ansicht entladen muss (wahrscheinlich für Speicherzweck). Wenn Sie beispielsweise einen modalen Ansichtscontroller anzeigen, wird möglicherweise die folgende Ansicht entladen und wenn das Modal abgewiesen wird, wird viewDidLoad aufgerufen.

Wenn Sie also Objekte in viewDidLoad zuweisen, können Sie sie lecken. Deshalb sollten Sie sie in viewDidUnload freigeben. In Ihrem Fall:

- (void)viewDidUnLoad { 
    [b1 release], b1 = nil; 
    [b2 release], b2 = nil; 
    [b3 release], b3 = nil; 
    [b4 release], b4 = nil; 
    [b5 release], b5 = nil; 
    [b6 release], b6 = nil; 
    [b7 release], b7 = nil; 
    [s1 release], s1 = nil; 
    [s2 release], s2 = nil; 
    [s3 release], s3 = nil; 
    [s4 release], s4 = nil; 
    [s5 release], s5 = nil; 
    [s6 release], s6 = nil; 
    [s7 release], s7 = nil; 

    [bg release], bg = nil; 
    [bgview release], bgview = nil; 
    [player release], player = nil; 

    [super viewDidUnload]; 
} 

Answer 2

ViewDidLoad wird nur einmal aufgerufen, wenn der viewController geladen ist. ViewWillAppear wird mehrmals aufgerufen, wenn die Ansicht aktualisiert wird.

Answer 3

Versuchen Sie, die Memory Management Programming Guide von Apple zu erkunden.