问题
I already have a slider that controls the output of a text label.
-(IBAction)mySlider:(UISlider *)sender
{
_myTextLabel.text = [NSString stringWithFormat:@"%i", (int) sender.value];
}
However, I also want a stepper to be able to changer the slider's position. So, if the slider has been set to 50, and the text label says 50, I want the stepper to increment to 51, 52, 53, etc. Does anyone know the code to do this? Thanks!
回答1:
You will need to keep an reference for the UISlider. Make a handler for UIStepper with valueChanged event.
Some settings that need to be done for both stepper and slider
Set minimum value and maximum value for both stepper and slider as 0 and 100 respectively. Set the step size of stepper as 1. Set the default value same for both stepper ans slider.
- (void)viewDidLoad
{
[super viewDidLoad];
self.slider.minimumValue = 0;
self.slider.maximumValue = 100;
self.stepper.minimumValue = 0;
self.stepper.maximumValue = 100;
self.stepper.stepValue = 1;
self.slider.value = 10;
self.stepper.value = 10;
}
- (IBAction)stepperValueChanged:(UIStepper *)sender {
[self.slider setValue:sender.value];
self.myTextLabel.text = [@((int)sender.value) stringValue];
}
- (IBAction)sliderValueChanged:(UISlider *)sender {
[self.stepper setValue:sender.value];
self.myTextLabel.text = [@((int)sender.value) stringValue];
}
来源：https://stackoverflow.com/questions/16391688/ios-controlling-a-slider-value-and-text-label-value-with-a-stepper