Question

我正在为我的项目编写一个UIButton抽象类。主要逻辑是当文本字段为空时，在用户启动输入文本时禁用并启用该按钮。当用户删除所有文本时，它将再次被禁用。

现在我不知道如何将UITextfield Delegate放入我的UIButton抽象类中。我是iOS的新手，这是我第一次这样做，所以请有人帮我解决这个问题吗？非常感谢你。我会在下面附上我的代码：

class BaseEnterButton: UIButton, UITextFieldDelegate {
var originalButtonText: String?
var activityIndicator: UIActivityIndicatorView!
var buttonTitle:String?


override init(frame: CGRect) {
    super.init(frame: frame)
    commonInit()
}

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

func commonInit() {
}

func showLoading(){

    originalButtonText = self.titleLabel?.text
    self.setTitle("", for: .normal) 

    if (activityIndicator == nil) {
        activityIndicator = createActivityIndicator()
    }
    showSpinning()
}

func textFieldDidBeginEditing(_ textField: UITextField) {
    self.isEnabled = true

}

func hideLoading() {
    let checkmarkImg = UIImage(named: "success")
    self.setTitle(originalButtonText, for:.normal)
    activityIndicator.stopAnimating()
    self.setImage(checkmarkImg, for: .normal)
}

private func createActivityIndicator() -> UIActivityIndicatorView {
    let activityIndicator = UIActivityIndicatorView()
    activityIndicator.hidesWhenStopped = true
    activityIndicator.color = UIColor.white
    return activityIndicator
}

private func showSpinning() {
    activityIndicator.translatesAutoresizingMaskIntoConstraints = false
    self.addSubview(activityIndicator)
    centerActivityIndicatorInButton()
    activityIndicator.startAnimating()
}

Answer 1

使用以下方法添加UIButton

-(BOOL) textFieldShouldBeginEditing:(UITextField *)textField
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.3f];
// self.scrollView.frame = CGRectMake(0, 35, self.view.bounds.size.width, 
self.view.bounds.size.height - 250);
[UIView commitAnimations];

UIButton *btnColor = [UIButton buttonWithType:UIButtonTypeCustom];
[btnColor addTarget:self action:@selector(btnColorPressed:) 
forControlEvents:UIControlEventTouchUpInside];
btnColor.frame = CGRectMake(150, 5, 25, 25);
[btnColor setBackgroundImage:[UIImage 
imageNamed:@"PaintPickerButton.png"] forState:UIControlStateNormal];
[self.txtField addSubview:btnColor];

return YES;
}

也许这会有所帮助

UITextfield代表UIButton抽象类

1 个答案: