iOS UISwitch用法和示例

iOS UISwitch用法和示例 (class UISwitch (swift))

動態建立UISwitch (代碼中建立) E.X.

• Xcode 7.0.1 + Swift 2.1

• 3 步

1 在本身繼承於UIViewController的VC中 例如在viewDidLoad

E.X.

override func viewDidLoad() {
	super.viewDidLoad()

	var c = CGPointMake(100.0, 64.0)
	self.savedUISwt = self.createUISwitch(centerAt: c, dftOn: true,
		onSwtChangeSelector: "onSwtChange:")

	c = CGPointMake(100.0, 128.0)
	self.savedUISwt2 = self.createUISwitch(centerAt: c, dftOn: false,
		onSwtChangeSelector: "onSwtChange2")

	self.view.addSubview(self.savedUISwt!)
	self.view.addSubview(self.savedUISwt2!)
}

2 實現方法createUISwitch

E.X.

/*
 * NAME createUISwitch - limited func to createUISwitch
 *
 * NOTE
 *   - only HERE (the VC use it -- selector)
 *   - UISwitch is a class -- to return is Nice (other all func local)
 */
private func createUISwitch (
	centerAt c: CGPoint,
	dftOn o: Bool,
	onSwtChangeSelector onSwtC: String) -> UISwitch {

	let swt = UISwitch()

	/* 設置位置 but size fixed !! */
	swt.center = c;

	/* swt.frame = CGRectMake(c.x, c.y, w, h) */

	/* 設置默認值 */
	swt.on = o;

	/* on switch (on/off) change */
	swt.addTarget(self, action: Selector(onSwtC),
		forControlEvents: UIControlEvents.ValueChanged)

	return swt
}

3 狀態改變"回調" (Selector)實現

• 有參數的更好點

• E.X.

  @IBAction private func onSwtChange (let sender: UISwitch) {
    	if let s = self.savedUISwt {
    		if (sender == s) {
    			print(__LINE__, "my swt on: \(sender.on)")
    		}
    	}
    }
  
  
    @IBAction private func onSwtChange2 () {
    	if let s = self.savedUISwt2 {
    		print(__LINE__, "my swt2 on: \(s.on)")
    	}
    }

init

• Designated Initializer

• NOTE: SIZE fixed !!

Returns

• an initialized switch object.

Declaration

Swift

init(frame frame: CGRect)

Setting the Off/On State

on

• A Boolean value that determines the off/on state of the switch

Declaration

Swift

var on: Bool

Discussion

• This property allows you to retrieve and set (without animation) a value determining whether the UISwitch object is on or off.

Availability

• Available in iOS 2.0 and later.

setOn

• Set the state of the switch to On or Off optionally animating the transition.

Declaration

Swift

func setOn(_ on: Bool,
	animated animated: Bool)

Parameters

• on

V

true
if the switch should be turned to the On position

V

false
if it should be turned to the Off position.
If the switch is already in the designated position, nothing happens.

• animated

V

true
to animate the 「flipping」 of the switch
otherwise false.

Discussion

• Setting the switch to either position does not result in an action message being sent.

Availability

• Available in iOS 2.0 and later.

Customizing the Appearance of the Switch

onTintColor
tintColor
thumbTintColor
onImage
offImage

Inherits From

NSObject

UIResponder

UIView

UIControl

UISwitch

Document Revision History

• This table describes the changes to UISwitch Class Reference.

  • 2013-09-18 Updated for iOS 7.

  • 2012-09-19 Added new methods introduced in iOS 6.

  • 2011-10-12 Updated for iOS 5.

  • 2010-04-06 Fixed a typo.

  • 2008-04-18 New document that describes the class for creating and managing the On/Off buttons known as switches

Ref

UISwitch Class Reference(developer.apple.com)