我想为UiSlider设置动画,例如0.25到0.75然后回来.这应该向用户显示要做什么.
我试过这个：
[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];
}
但那不是那么顺利……我可以使用转换吗？
[Slider setValue:1 animated:YES];
快要…
[UIView animateWithDuration:2.0
animations:^{
[Slider setValue:0.2];
}];
[UIView animateWithDuration:2.0
animations:^{
[Slider setValue:0.5];
}];
只是动画第二个……
解决方法
您需要通过将第二个动画放在第一个动画的完成块中来链接动画：
-(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
}];
}];
}
