ios - TouchUpInside 按钮不工作

Question

我有以下代码:

override func viewDidLoad() {
        super.viewDidLoad()
        ...
        signInButton = CustomButton(frame: CGRectMake(12.5/100.0 * self.view.bounds.size.width, 5/6.0 * self.view.bounds.size.height, 60, 23))
        signInButton.customizeButtonText("Sign in")

        joinButton = CustomButton(frame: CGRectMake((75/100.0 * self.view.bounds.size.width), 5/6.0 * self.view.bounds.size.height, 60, 23))
        joinButton.customizeButtonText("Join")

        userNameTextField = CustomTextField(frame: CGRectMake(-500, 60/100.0 * self.view.bounds.size.height, 400, 35))
        userNameTextField.placeholder = "Username"

        passwordTextField = CustomTextField(frame: CGRectMake(-500, 70/100.0 * self.view.bounds.size.height, 400, 35))
        passwordTextField.placeholder = "Password"

        signInButton.addTarget(self, action: "signInButtonClicked:", forControlEvents: UIControlEvents.TouchUpInside)
        joinButton.addTarget(self, action: "joinButtonClicked:", forControlEvents: UIControlEvents.TouchUpInside)
}

然后在 signInButtonClicked: 和 joinButtonClicked: 方法中我有这段代码，我将 UITextField 设置为我想要的特定 x 和 y 位置:

func signInButtonClicked(sender: UIButton!) {
        UIView.animateWithDuration(0.25, delay: 0.25, options: UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in
            self.userNameTextField.frame = CGRectMake((-500 + ((50/100.0 * self.view.bounds.size.width) - 200)), 60/100.0 * self.view.bounds.size.height, 400,35)
            }, completion: nil)
    }

    func joinButtonClicked(sender: UIButton!) {
        UIView.animateWithDuration(0.25, delay: 0.25, options: UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in
            self.passwordTextField.frame = CGRectMake((-500 + ((50/100.0 * self.view.bounds.size.width) - 200)), 70/100.0 * self.view.bounds.size.height, 400,35)
            }, completion: nil)
    }

出于某种原因，每当我点击 signInButton 或 joinButton 时，文本字段的动画不会发生。我在这里做错了什么吗？我将两个按钮的目标添加到 self 并为每个按钮设置正确的操作。

自定义按钮类:

import UIKit

class CustomButton: UIButton {

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.layer.cornerRadius = 2.0
        self.layer.shadowColor = UIColor(red: SHAWDOW_COLOR, green: SHAWDOW_COLOR, blue: SHAWDOW_COLOR, alpha: 0.5).CGColor
        self.layer.shadowRadius = 5.0
        self.layer.shadowOpacity = 1
        self.layer.shadowOffset = CGSizeMake(0.0, 2.0)
        self.titleLabel?.font = UIFont(name: "NotoSans-Regular", size: 17.0)
        self.backgroundColor = UIColor.redColor()
        self.userInteractionEnabled = true
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)!
    }

    func customizeButtonText(text: String!) {
        self.setTitle(text, forState: UIControlState.Normal)
    }
}

Answer 1

您的代码(请说:应该)有效；不起作用的是您在这些操作方法中设置动画位置的方式。

通过查看您设置 UITextFields 初始位置和动画后位置的方式，我了解到您希望 UITextFields最初在屏幕外，然后在单击按钮后在屏幕上显示动画。

鉴于此，问题出在以下代码行:

self.userNameTextField.frame = CGRectMake((((-500 + 50/100.0 * self.view.bounds.size.width) - 200)), 60/100.0 * self.view.bounds.size.height, 400, 35)

self.passwordTextField.frame = CGRectMake((((-500 + 50/100.0 * self.view.bounds.size.width) - 200)), 70/100.0 * self.view.bounds.size.height, 400,35)

记录这些数字，人们会看到:

NSLog("%f", (-500 + ((50/100.0 * self.view.bounds.size.width) - 200)))

-512.500000 

功能确实有效，动画也是如此；只是您将 UITextField 从最初位于屏幕外的位置设置为动画，好吧，又是另一个位于屏幕外的位置。

通过简单地将动画 block 中的行分别更改为以下内容:

self.userNameTextField.frame = CGRectMake((((50/100.0 * self.view.bounds.size.width) - 200)), 60/100.0 * self.view.bounds.size.height, 400, 35)

self.passwordTextField.frame = CGRectMake((((50/100.0 * self.view.bounds.size.width) - 200)), 70/100.0 * self.view.bounds.size.height, 400,35)

允许我们在单击按钮后看到 UITextField 确实进入屏幕。