ios - how to store slider values in ios

Question

Hi I am using uislider and get the values in label. now i try to save the slider values. I don't know how to do this. If anybody knows please share the code. This is my code for slider changed. -(IBAction)sliderChanged:(id)sender
{
UISlider *slider = (UISlider *)sender;
if((int)slider.value % 10 == 0)
{
sliderLabel.text = [[NSString alloc] initWithFormat:@"Value of:%d", (int)slider.value];
}
}

Answer 1

您可以使用NSUserDefault来存储滑块值。

NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:sliderLabel.text forKey:@"Slider"];
[defaults synchronize];

您可以检索数据，例如：

NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
NSString *strValue =   [defaults objectForKey:@"Slider"];
myLabel.text = strValue != nil ? strValue : @"No Value";

上面的代码是保存sliderLabel到NSUserDefault. 如果您想以浮点数的形式存储滑块值，请使用：

[defaults setObject:[NSNumber numberWithFloat:slider.value] forKey:@"Slider"];

像这样检索它：

NSNumber *strValue =   [defaults objectForKey:@"Slider"];

Answer 2

NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[NSNumber numberWithFloat:slider.value] forKey:@"sliderValue"];

我相信您应该将值存储为浮点数（UISlider 值的原始类型），它更简洁，并且您可能希望在重新打开屏幕时重新使用浮点值来设置滑块，例如：

NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[self.slider setValue:[[defaults objectForKey@"sliderValue"] floatValue]];