ios 设置滑块值
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Set slider value
提问by miholzi
i try to set a value to a slider after a button click, but it does not work - the slider does not move. the code runs fine without mistakes.
我尝试在单击按钮后为滑块设置一个值，但它不起作用 - 滑块不移动。代码运行良好，没有错误。
It should be pretty simple but I can't figure it out. xCode Version 4.5.2
它应该很简单，但我无法弄清楚。xCode 版本 4.5.2
Thanks!
谢谢！
here my code:
这是我的代码：
ViewController.h
视图控制器.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
@property (weak, nonatomic) IBOutlet UILabel *debugLabel;
@property (weak, nonatomic) IBOutlet UISlider *slider;
- (IBAction)slider:(id)sender;
- (IBAction)ButtonChangeValue:(id)sender;
@end
ViewController.m
视图控制器.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize slider;
...
- (IBAction)slider:(UISlider *)sender {
float value = [sender value];
self.debugLabel.text = [NSString stringWithFormat:@"Value: %f",value];
}
- (IBAction)ButtonChangeValue:(id)sender {
slider.value = 90;
}
回答by rdurand
I think your problem is that the slider accepts values between 0.0 and 1.0 (default values, change them with _slider.maximumValueand _slider.minimumValue). Try setting the value to 0.9 instead of setting 90 (if you mean 90%).
我认为您的问题是滑块接受 0.0 和 1.0 之间的值（默认值，使用_slider.maximumValue和更改它们_slider.minimumValue）。尝试将该值设置为 0.9 而不是设置 90（如果您的意思是 90%）。
If the slider updates but is not animated, use :
如果滑块更新但没有动画，请使用：
[_slider setValue:0.9 animated:YES];
Note that given your code, you may need to use self.sliderinstead of _slider.
请注意，鉴于您的代码，您可能需要使用self.slider代替_slider.
回答by spider1983
try using
尝试使用
self.slider.value = 90;
instead of
代替
slider.value = 90;
回答by iPatel
Check MyAnswer
检查我的答案
- (void)viewDidLoad
{
UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(sliderTapped:)];
[slider addGestureRecognizer:gr];
}
- (void)sliderTapped:(UIGestureRecognizer *)g
{
UISlider* s = (UISlider*)g.view;
if (s.highlighted)
return; // tap on thumb, let slider deal with it
CGPoint pt = [g locationInView: s];
CGFloat percentage = pt.x / s.bounds.size.width;
CGFloat delta = percentage * (s.maximumValue - s.minimumValue);
CGFloat value = s.minimumValue + delta;
[s setValue:value animated:YES];
NSString *str=[NSString stringWithFormat:@"%.f",[self.slider value]];
self.lbl.text=str;
}
回答by MuhammadBassio
To use slider.value = 90;
使用 slider.value = 90;
Your ViewController.h should be:
你的 ViewController.h 应该是：
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
{
UISlider *slider;
}
@property (weak, nonatomic) IBOutlet UILabel *debugLabel;
@property (weak, nonatomic) IBOutlet UISlider *slider;
- (IBAction)slider:(id)sender;
- (IBAction)ButtonChangeValue:(id)sender;
@end
And don't forget @synthesize slider;in your ViewController.m as well.
并且不要忘记@synthesize slider;在您的 ViewController.m 中。
Otherwise, use self.slider.value = 90;or _slider.value = 90;
否则，使用self.slider.value = 90;或_slider.value = 90;
回答by Abhirajsinh Thakore
For Swift, you can use:
对于 Swift，您可以使用：
slider.setValue(5.0, animated: true)
回答by Rana
i think . as you have not mentioned maximum and minimum value of slider ,it is taking default max and min values that are 0 to 1. So it is not possible to set value =90. First change its max and min like this :
我认为 。由于您没有提到滑块的最大值和最小值，它采用 0 到 1 的默认最大值和最小值。因此无法设置值 = 90。首先像这样改变它的最大值和最小值：
Slider.minimumValue = 1;
Slider.maximumValue = 100;
now try your thing ,
现在试试你的东西，
Slider.value =90;
回答by Rok Jarc
Since you are using interface builder first thing to look at would be: are the UI components (slider, button) connected to the IBOutlets in File's owner. This is the most common source of problems like this.
由于您使用的是界面构建器，因此首先要查看的是：UI 组件（滑块、按钮）是否连接到文件所有者中的 IBOutlets。这是此类问题的最常见来源。
Then check the min and max of the slider (default is 0;1 - as rdurand mentioned).
然后检查滑块的最小值和最大值（默认值为 0;1 - 正如 rdurand 所述）。
And spider1983 is correct also: since slider is a property, you can address it as self.slider (or _slider, but you shouldn't use the last one in this case).
Spider1983 也是正确的：因为滑块是一个属性，你可以将它作为 self.slider（或 _slider，但在这种情况下你不应该使用最后一个）。
