试图改变UISwitch

Question

的背景图片

代码：

let switchTerms = UISwitch(frame:CGRectMake(XPos, YPos, Width, Height)) 
     switchTerms.addTarget(self, action: "switchTermsAction:", forControlEvents: .ValueChanged) 
     switchTerms.onImage = UIImage(named:"SIGN-UP-toggle-Active.png") 
     scrollSignUp!.addSubview(switchTerms); 

func switchTermsAction(sender:UISwitch){ 

     if sender.on{ 

      sender.onImage = UIImage(named:"SIGN-UP-toggle-Active.png") 
     } 
     else{ 
      sender.offImage = UIImage(named:"SIGN-UP-toggle-DeActive.png") 
     } 
    } 

我想，当它被改变以改变UISwitch的背景图像。 似乎没有设置背景图片。

我的代码有什么问题？

Answer 1

onImage和offImage属性有因为根据苹果文档

尝试iOS7创建一个UIButton，并根据selected:Bool财产上的这个按钮设置图像，使其像一个开关

没有影响当你按下按钮时，使sender.selected = !sender.selected然后刷新图像。你将有一个自定义开关！

Answer 2

@property (weak, nonatomic) IBOutlet UIImageView *genderSwitchBackgroundImageView; 
@property (weak, nonatomic) IBOutlet UISwitch *genderSwitch; 

... 

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    self.genderSwitch.onTintColor = [UIColor clearColor]; 
    self.genderSwitch.tintColor = [UIColor clearColor]; 

    [self genderSwitchValueChanged]; 
} 

- (IBAction)genderSwitchValueChanged { 
    self.genderSwitchBackgroundImageView.image = [UIImage imageNamed:(self.genderSwitch.isOn ? @"toggle_male" : @"toggle_female")]; 
} 

斯威夫特：

import UIKit 

class ViewController: UIViewController { 

    @IBOutlet weak var genderSwitchBackgroundImageView: UIImageView! 
    @IBOutlet weak var genderSwitch: UISwitch! 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     genderSwitch.tintColor = UIColor.clearColor() 
     genderSwitch.onTintColor = UIColor.clearColor() 

     genderSwitchValueChanged() 
    } 

    @IBAction func genderSwitchValueChanged() { 
     genderSwitchBackgroundImageView.image = UIImage(named:genderSwitch.on ? "toggle_male" : "toggle_female") 
    } 
}