下面的算法应该被审查,当然也应该优化。这只是我整理的东西,我还没有测试过。
用最大值和最小值初始化每个滑块,并根据需要设置初始值,但要尊重x + y + z = 1
.
[self.slider1 setMinimumValue:0.0];
[self.slider1 setMaximumValue:1.0];
[self.slider1 setValue:0.20];
[self.slider2 setMinimumValue:0.0];
[self.slider2 setMaximumValue:1.0];
[self.slider2 setValue:0.30];
[self.slider3 setMinimumValue:0.0];
[self.slider3 setMaximumValue:1.0];
[self.slider3 setValue:0.50];
将三个滑块设置为相同的选择器:
[self.slider1 addTarget:self action:@selector(valueChanged:) forControlEvents:UIControlEventValueChanged];
[self.slider2 addTarget:self action:@selector(valueChanged:) forControlEvents:UIControlEventValueChanged];
[self.slider3 addTarget:self action:@selector(valueChanged:) forControlEvents:UIControlEventValueChanged];
选择器应该这样做:
- (void)valueChanged:(UISlider *)slider {
UISlider *sliderX = nil;
UISlider *sliderY = nil;
UISlider *sliderZ = nil;
if (slider == self.slider1) {
sliderX = self.slider1;
sliderY = self.slider2;
sliderZ = self.slider3;
} else if (slider == self.slider2) {
sliderY = self.slider1;
sliderX = self.slider2;
sliderZ = self.slider3;
} else {
sliderY = self.slider1;
sliderZ = self.slider2;
sliderX = self.slider3;
}
float x = sliderX.value;
float y = sliderY.value;
float z = sliderZ.value;
// x + y + z = 1
// Get the amout x has changed
float oldX = 1 - y - z;
float difference = x - oldX;
float newY = y - difference / 2;
float newZ = z - difference / 2;
if (newY < 0) {
newZ += y + newY;
newY = 0;
}
if (newZ < 0) {
newY += z + newZ;
newZ = 0;
}
[sliderY setValue:newY animated:YES];
[sliderZ setValue:newZ animated:YES];
}
如果此代码有问题,请告诉我,我可以修复它!