infinitely scrolling background (UIView animation)

Question

I'm trying to achieve an infinitely scrolling background by having two UIViews scroll and replace each other like a conveyor belt. This is my code so far, I can't seem to get it to work

- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. bg1 = [[UIView alloc] initWithFrame:self.view.frame]; [bg1 setBackgroundColor:[UIColor redColor]]; bg2 = [[UIView alloc] initWithFrame:self.view.frame]; [bg2 setBackgroundColor:[UIColor blueColor]]; [self.view addSubview:bg1]; [self.view addSubview:bg2]; [self.view bringSubviewToFront:bg1]; [self animate]; } - (void)animate { [UIView animateWithDuration:3000 animations:^{ bg1.frame = CGRectOffset(bg1.frame, 0, bg1.frame.size.height); }completion:^(BOOL done) { if (done) { bg1.frame = CGRectOffset(bg1.frame, 0, -bg1.frame.size.height); [self.view sendSubviewToBack:bg1]; [UIView animateWithDuration:3000 animations:^{ bg2.frame = CGRectOffset(bg2.frame, 0, bg2.frame.size.height); }completion:^(BOOL done) { if (done) { bg2.frame = CGRectOffset(bg2.frame, 0, -bg2.frame.size.height); [self.view sendSubviewToBack:bg2]; [self animate]; } }]; } }]; }

Halpo · Accepted Answer · 2014-05-15 15:28:11Z

my bad! i thought withDuration was in ms. It's in seconds!

- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. bg1 = [[UIView alloc] initWithFrame:self.view.frame]; [bg1 setBackgroundColor:[UIColor redColor]]; bg2 = [[UIView alloc] initWithFrame:self.view.frame]; [bg2 setBackgroundColor:[UIColor blueColor]]; [self.view addSubview:bg1]; [self.view addSubview:bg2]; [self.view bringSubviewToFront:bg1]; [self animate]; } - (void)animate { [UIView animateWithDuration:3 animations:^{ bg1.frame = CGRectOffset(bg1.frame, 0, bg1.frame.size.height); }completion:^(BOOL done) { if (done) { bg1.frame = CGRectOffset(bg1.frame, 0, -bg1.frame.size.height); [self.view sendSubviewToBack:bg1]; [UIView animateWithDuration:3 animations:^{ bg2.frame = CGRectOffset(bg2.frame, 0, bg2.frame.size.height); }completion:^(BOOL done) { if (done) { bg2.frame = CGRectOffset(bg2.frame, 0, -bg2.frame.size.height); [self.view sendSubviewToBack:bg2]; [self animate]; } }]; } }]; }

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