Question

当我移动到另一个viewcontroller时，如何停止videobackground？因为当我移动到另一个视图控制器时，视频和背景音乐继续播放，当我返回主页面时，两个视频重叠。所以当我移动到另一个视图控制器时，我希望视频和音乐停止，例如当我在viewcontroller中移动以进行注册时

import UIKit
import SwiftVideoBackground
import Firebase
import FirebaseAuth

class ViewController: UIViewController {

private let videoBackground = VideoBackground()

@IBOutlet weak var usernameField: UITextField!

@IBOutlet weak var passwordField: UITextField!

@IBOutlet weak var mute_img: UIImageView!

@IBOutlet private var muteSwitch: UISwitch!

@IBAction func `switch`(_ sender: UISwitch) {



    if (sender.isOn == true)
    {
        mute_img.isHidden = false
        videoBackground.isMuted = true
    }
    else
    {
        mute_img.isHidden = true
        videoBackground.isMuted = false
    }

    let shouldMute = sender.isOn
    videoBackground.isMuted = shouldMute
    UserDefaults.standard.set(shouldMute, forKey:"isMuted")
   }


override func viewDidLoad() {
    super.viewDidLoad()
    let userDefaults = UserDefaults.standard
    let shouldMute = userDefaults.bool(forKey: "isMuted")
    videoBackground.play(view: view, videoName: "intro", videoType: 
    "mp4", isMuted: shouldMute, willLoopVideo : true)
    muteSwitch.isOn = shouldMute


    }

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    self.view.endEditing(true)
}

func textFieldShouldReturn(_ textField: UITextField) -> Bool {

    if textField == usernameField {
        passwordField.becomeFirstResponder()
    } else if textField == passwordField {
        textField.resignFirstResponder()
    }
    return true
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

Answer 1

按照以下步骤操作：

1）为交换机制作IBOutlet

@IBOutlet private var muteSwitch: UISwitch!

不要忘记将它连接到故事板中的开关。

2）从UserDefaults（在viewDidLoad中）读取保存的值：

override 
func viewDidLoad() {
    super.viewDidLoad()
    let userDefaults = UserDefaults.standard
    let shouldMute = userDefaults.bool(forKey: "isMuted")
    videoBackground.play(view: view, videoName: "intro", videoType: "mp4", isMuted: shouldMute, alpha : 0.25, willLoopVideo : true)
    muteSwitch.isOn = shouldMute
}

3）将开关值保存到UserDefaults（在@IBAction func`witch`中）：

@IBAction func `switch`(_ sender: UISwitch) {
    let shouldMute = sender.isOn
    videoBackground.isMuted = shouldMute
    UserDefaults.standard.set(shouldMute, forKey:"isMuted")
}

Answer 2

override func viewDidLoad() {
    super.viewDidLoad()

    let userDefaults = UserDefaults.standard
    if userDefaults.value(forKey: "isMuted") != nil{

        let object = userDefaults.value(forKey: "isMuted") as? NSNumber
        yourSwitch.isOn = (object?.boolValue)!
    }
}
@IBAction func switchChanged(sender: UISwitch) {
    let uDefault = UserDefaults.standard
    if sender.isOn {
        uDefault.setValue(NSNumber(value: true), forKey:"isMuted")

    }
    else {
        uDefault.setValue(NSNumber(value: false), forKey:"isMuted")

    }

}

Answer 3

<强> 1。目标 - C版

#import＆＃34; ViewController.h＆＃34;

@interface ViewController ()

@property (strong, nonatomic) IBOutlet UISwitch *bluetoothSwitch;

- (IBAction)saveSwitchState:(id)sender;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    if ([defaults objectForKey:@"SwitchState"])
        self.bluetoothSwitch.on = [defaults boolForKey:@"SwitchState"];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)saveSwitchState:(id)sender
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    if ([self.bluetoothSwitch isOn]) 
        [defaults setBool:YES forKey:@"SwitchState"];
    else 
       [defaults setBool:NO forKey:@"SwitchState"];
}
@end

Swift版本

导入UIKit

class ViewController: UIViewController {
    @IBOutlet weak var textField: UITextField!
    @IBOutlet weak var stateSwitch: UISwitch!

    @IBAction func buttonClicked(_ sender: Any) {
        if stateSwitch.isOn {
            textField.text = "The Switch is Off"
            stateSwitch.setOn(false, animated:true)
        } else {
            textField.text = "The Switch is On"
            stateSwitch.setOn(true, animated:true)
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        stateSwitch.addTarget(self, action: #selector(stateChanged), for: UIControlEvents.valueChanged)
    }

    @objc func stateChanged(switchState: UISwitch) {
        if switchState.isOn {
            textField.text = "The Switch is On"
        } else {
            textField.text = "The Switch is Off"
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

我怎么能停止视频背景？

3 个答案: