菜单滑块 - iPhone在滑动时获得UISlider指针的x坐标 [英] Menu over slider - iPhone getting the x co-ordinate of UISlider Pointer when sliding

问题描述

可以设置max& iPhone中 UISlider 控件的最小值。因此滑块可以工作 - 好 - 好。

It is ok to set the max & min value for a UISlider control in iPhone. Accordingly slider will work - OK - Good.

首先，我将举例说明我想要实施的内容。

First, I will give an example of what exactly I want to implement.

• 在iPad中默认使用日历应用程序。


• 打开日历，在底部 - 您可以看到日/周/月列表


• 当您滑动手指时，滑动时会看到一个弹出菜单。


• 我想在滑块上实现相同的功能。

• In iPad comes with Calendar application as a default.
• Open calendar, at the bottom - you can see day/week/month listing
• When you slide your finger on it, you will see a pop up menu when sliding.
• I want to implement the same functionality on slider.

我正在努力，但如果我能够得到x坐标，我可以很容易地实现它。任何其他实现相同的建议都是最受欢迎的。

I am trying hard, But if I am able to get x co-ordinate, I can easily implement it. Any other suggestion for implementing same are most most welcome.

推荐答案

从UILabel开始测试（只需在其中写一些内容）并向其添加IBOulets，以及UISlider。接下来，为滑块添加更改值的IBAction。

Start out with a UILabel for testing (just write something in it) and add IBOulets to it, as well as the UISlider. Next, add a IBAction for "value changed" for the slider.

然后，您需要计算两个值以确定应放置标签的位置 - 从左侧调整，以及滑块的每个值的像素。你的 @interface 可能如下所示：

You then need to calculate two values to figure out where your label should be placed -- adjustment from left, and pixels per value for the slider. Your @interface might look like this:

@interface sliderViewController : UIViewController {
    IBOutlet UISlider *slider;
    IBOutlet UILabel *label;
    float pixelsPerValue;
    float leftAdjust;
}
-(IBAction) sliderValueChanged:(id)sender;

@end

例如viewDidLoad：对于你的视图控制器，你可以计算两个浮点数。

In e.g. viewDidLoad: for your view controller, you do the calculation for the two floats.

- (void)viewDidLoad {
    float width = slider.frame.size.width;
    pixelsPerValue = width / (slider.maximumValue - slider.minimumValue);
    leftAdjust = slider.frame.origin.x;
    [super viewDidLoad];
}

最后，您的IBAction可能如下所示：

And finally, your IBAction might look like this:

-(IBAction) sliderValueChanged:(id)sender
{
    NSLog(@"changed");
    CGRect frame = label.frame;
    frame.origin.x = leftAdjust + (pixelsPerValue * slider.value);
    label.frame = frame;
}

希望有所帮助。

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