i want to animate an UISlider for e.g. 0.25 to 0.75 and back. This should show the user what is to do.
i tried this:
[self incrementCounter:[NSNumber numberWithInt:0]];
-(void) incrementCounter:(NSNumber *)i {
[Slider setValue:[i floatValue]/1000];
[self performSelector:@selector(incrementCounter:) withObject:[NSNumber numberWithInt:i.intValue+1] afterDelay:0.001];
}
but thats not so smooth... can i use transitions for this?
[Slider setValue:1 animated:YES];
is to fast...
[UIView animateWithDuration:2.0
animations:^{
[Slider setValue:0.2];
}];
[UIView animateWithDuration:2.0
animations:^{
[Slider setValue:0.5];
}];
Just animates the second one...
You need to chain the animations by putting the second animation in the completion block of the first:
-(IBAction)animateSlider:(id)sender {
[UIView animateWithDuration:2 animations:^{
[self.slider setValue:.75];
} completion:^(BOOL finished) {
[UIView animateWithDuration:2 animations:^{
[self.slider setValue:0.25];//or `[self.slider setValue:(.75)-(.5*finished)];` if you want to be safe
}];
}];
}
Swift 2.2 version for rdelmar's answer
@IBOutlet weak var slider: UISlider!
func animateSlider(sender: AnyObject){
UIView.animateWithDuration(2, animations: {() in
self.slider.setValue(0.75, animated: true)
}, completion:{(Bool) in
UIView.animateWithDuration(2, animations: {() in
self.slider.setValue(0.25, animated: true)
})
})
}
and to call the function pass the UISlider in the parameter
animateSlider(self.slider)
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