UIKit学习之滑块控件UiSlider的用法

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Slider:

Sliders enable users to interactively modify some adjustable value in an app,such as speaker volume or screen brightness.@H_404_3@

UiSlider:

AUiSliderobject is a visual control used to select a single value from a continuous range of values. Sliders are always displayed as horizontal bars. An indicator,orthumb,notes the current value of the slider and can be moved by the user to change the setting.

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UiSlider控件的创建：

(1) 在Stroyboard中使用Ctrl+Drag拖拽法创建

(2) 代码创建

//创建slider控件
letslider=UiSlider(frame:CGRectMake(0,300,50))
//设置slider
slider.center=self.view.center
slider.minimumValue=0//最小值
slider.maximumValue=1//最大值
slider.value=0.5//当前默认值

self.view.addSubview(slider)

设置UiSlider控件的值：

Slider的值范围是0-1,是六位数的浮点数

slider.setValue(0.8,animated:true)

slider.minimumValue=0//最小值
slider.maximumValue=1//最大值

设置UiSlider控件的边槽颜色：

//设置边槽的颜色
slider.minimumTrackTintColor=UIColor.redColor()//左边槽的颜色,默认是蓝色的
slider.maximumTrackTintColor=UIColor.brownColor()//右边槽的颜色,默认是灰色的

代码示例：

importUIKit

classViewController:UIViewController{

overridefuncviewDidLoad(){
super.viewDidLoad()
//Doanyadditionalsetupafterloadingtheview,typicallyfromanib.

letslider=UiSlider(frame:CGRectMake(0,50))
slider.center=self.view.center
slider.minimumValue=0//最小值
slider.maximumValue=1//最大值
slider.value=0.5//当前默认值

slider.continuous=false//滑块滑动停止后才触发ValueChanged事件

//添加响应事件
slider.addTarget(self,action:"sliderDidchanged:",forControlEvents:UIControlEvents.ValueChanged)

//设置边槽的颜色
slider.minimumTrackTintColor=UIColor.redColor()//左边槽的颜色,默认是灰色的

self.view.addSubview(slider)

}


//响应事件函数
funcsliderDidchanged(slider:UiSlider){

//输出控件的值
print(slider.value)

//设置Slider的值大小为0.8
//slider.setValue(0.8,animated:true)
//print(slider.value)
}

overridefuncdidReceiveMemoryWarning(){
super.didReceiveMemoryWarning()
//DispoSEOfanyresourcesthatcanberecreated.
}

}

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开发环境：

XcodeVersion 7.0 (7A220)

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参考资料：

http://www.hangge.com/blog/cache/detail_536.html

https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/UIKitUICatalog/UISlider.html

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UISlider_Class/index.html