Question

这是我的代码

import UIKit

class ForwardTextField: UITextField {

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func drawRect(rect: CGRect) {
    // Drawing code
}
*/

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    super.touchesBegan(touches, withEvent: event)
    self.nextResponder()!.touchesBegan(touches, withEvent: event)
    NSLog("Textfield Touches Began")
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
    super.touchesMoved(touches, withEvent: event)
    self.nextResponder()!.touchesMoved(touches, withEvent: event)
    NSLog("Textfield Touches Moved")
}

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    super.touchesEnded(touches, withEvent: event)
    self.nextResponder()!.touchesEnded(touches, withEvent: event)
    NSLog("Textfield Touches Ended")
}

override func touchesCancelled(

    touches: Set<UITouch>?, withEvent event: UIEvent?) {
    super.touchesCancelled(touches, withEvent: event)
    self.nextResponder()!.touchesCancelled(touches, withEvent: event)
    //NSLog(@"Textfield Touches Cancelled");
}
// placeholder position

override func textRectForBounds(bounds: CGRect) -> CGRect {
    return CGRectInset(bounds, 10, 10)
}
// text position

override func editingRectForBounds(bounds: CGRect) -> CGRect {
    return CGRectInset(bounds, 10, 10)
}

}

我是我的UITextField的子类，我试图拖动视图，但我不知道我在哪里做错了。第一次触摸时它不能拖动但是在第二次触摸时它会跳到另一个位置任何人都可以帮助我解决这个问题，现在已经有一段时间了，我现在仍然坚持这一点。我正试图做一些类似于可拖动的Snapchat textfield。

    var textField = ForwardTextField()


  override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    print("TOUCHES BEGAN\n ")
    print("self.textfield == nil = \(self.view.subviews.contains(self.textField))\n")




    self.isDrawing = false
    if !self.view.subviews.contains(self.textField){
        self.textFieldY = 80.0
        self.textField = ForwardTextField(frame: CGRectMake(0.0, self.textFieldY, self.view.frame.size.width, 40.0))
        self.textField.borderStyle = .None
        self.textField.backgroundColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.4)
        //self.textField.alpha = 0.4;
        self.textField.textColor = UIColor.whiteColor()
        self.textField.returnKeyType = .Done
        self.textField.delegate = self
        //ADDED
        //self.textField.userInteractionEnabled = true
        self.textField.multipleTouchEnabled = false
        self.textField.exclusiveTouch = false
        self.textField.textAlignment = .Center
        self.view.addSubview(self.textField)
        print("Show Text BOx")
        if self.textField.hidden == true {
            self.textField.hidden = false
        }
        self.textField.becomeFirstResponder()

    }else {

        let touch: UITouch = touches.first!
        //NSLog(@"touchesBegan");
        let point: CGPoint = touch.locationInView(self.view)
        if self.view.subviews.contains(self.textField) && CGRectContainsPoint(self.textField.frame, point) && !self.textField.hidden{

            self.isMovingText = true


        }
        if self.isDrawing {
            self.lastPoint = point
        }

    }


}

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
    print("TOUCHES MOVED ")
    print("ISMOVING TEXT = \(isMovingText)")
    if self.isMovingText {
        print("MOVESSSS")
        let touch: UITouch = touches.first!
        var point: CGPoint = touch.locationInView(self.view)
        self.textFieldY = point.y
        self.textField.frame = CGRectMake(0.0, point.y, self.textField.frame.size.width, self.textField.frame.size.height)
        self.view.setNeedsDisplay()
    }
    if self.isDrawing {
        //NSLog(@"touchmoved");
        var touch: UITouch = touches.first!
        var currentPoint: CGPoint = touch.locationInView(self.view)
        self.image.drawAtPoint(CGPointMake(0.0, 0.0))
        CGContextMoveToPoint(UIGraphicsGetCurrentContext(), self.lastPoint.x, self.lastPoint.y)
        CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y)
        CGContextSetLineCap(UIGraphicsGetCurrentContext(), .Round)
        CGContextSetLineWidth(UIGraphicsGetCurrentContext(), brush)
        CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), self.drawColor.CGColor)
        CGContextSetBlendMode(UIGraphicsGetCurrentContext(),.Normal)
        CGContextStrokePath(UIGraphicsGetCurrentContext())
        self.image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        self.lastPoint = currentPoint
        self.view.setNeedsDisplay()
    }
}

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {

    if self.isMovingText == true {
        var touch: UITouch = touches.first!
        var point: CGPoint = touch.locationInView(self.view)
        self.textFieldY = point.y
        self.textField.frame = CGRectMake(0.0, point.y, self.textField.frame.size.width, self.textField.frame.size.height)
        self.view.setNeedsDisplay()
        self.isMovingText = false
    }
    if self.isDrawing {
        //NSLog(@"touchended");
        self.image.drawAtPoint(CGPointMake(0.0, 0.0))
        CGContextSetLineCap(UIGraphicsGetCurrentContext(),.Round)
        CGContextSetLineWidth(UIGraphicsGetCurrentContext(), brush)
        CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), self.drawColor.CGColor)
        CGContextMoveToPoint(UIGraphicsGetCurrentContext(), self.lastPoint.x, self.lastPoint.y)
        CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), self.lastPoint.x, self.lastPoint.y)
        CGContextStrokePath(UIGraphicsGetCurrentContext())
        CGContextFlush(UIGraphicsGetCurrentContext())
        self.image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        self.view.setNeedsDisplay()
    }
}

Answer 1

虽然关于拖动UITextField

的文档中没有说什么

这似乎是一个坏主意（我的观点），因为UITextField的目的是接受用户文本输入，但是，我测试成功地使用UIView父级在UIView内拖动带有UITextField的UIView。

我会删除UITextField中的所有触摸代码。对UIView进行子类化并添加一个touchesMoved方法来覆盖; inside获取位置并在UIView.center上使用它。

对我来说很棒。在swift 2.2和3上进行了测试。

在UIView（Swift）周围拖动UITextField

1 个答案: