试图改变UISwitch的背景图像

Question

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")
        }
    }

我试图更改UISwitch的背景图像。 似乎未设置背景图像。

我的代码出了什么问题？

Answer 1

@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")];
}

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")
    }
}

Answer 2

根据Apple文档，

onImage和offImage属性自iOS7起无效

尝试创建UIButton，并根据selected:Bool属性在此按钮上设置图像，使其行为类似于Switch

按下按钮时，请sender.selected = !sender.selected然后刷新图像。你将有一个自定义开关！