在运行时添加UI元素的问题
我遇到这种情况：
滚动视图中的粉红色视图我想要的是：
当我点击“添加”按钮时，我希望创建另一个粉红色视图对象（这没有问题）并将其设置在第一个粉红色视图对象设置自动布局下方（它与之前的粉红色视图之间的垂直空间）对象，尾随空间.....）但我无法做到这一点。
你能帮帮我吗？1 个答案:
答案 0 :(得分：0)
我不确定在向scrollview添加视图时遇到问题。以下是在运行时将按钮添加到scrollview的示例。您可以使用相同的代码添加粉红色视图。
import UIKit
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate
{
var pickerviewObj : UIPickerView!=UIPickerView()
var scrlview: UIScrollView = UIScrollView();
var cotentView : UIView = UIView();
var arrdata :NSMutableArray=["1","2","3","4","5","6","7","8","9","10"]
var dctButtons : NSMutableDictionary!=NSMutableDictionary()
var ContentViewconstraintheight : NSLayoutConstraint = NSLayoutConstraint()
var xPos,ypos: NSInteger!
var SelctedTag : NSInteger!
var width: Double!
// var colors = ["Red","Yellow","Green","Blue"]
func getCalculatedHeightForScren(height : CGFloat) -> CGFloat {
return (height * self.view.frame.size.height/568 );
}
func disableAutoResizingMasks() {
self.pickerviewObj.translatesAutoresizingMaskIntoConstraints = false
self.scrlview.translatesAutoresizingMaskIntoConstraints = false
self.cotentView.translatesAutoresizingMaskIntoConstraints = false;
}
override func viewDidLoad()
{
super.viewDidLoad()
let pickerHeight = getCalculatedHeightForScren(height: 50)
self.pickerviewObj = UIPickerView(frame: CGRect(x: 0, y: self.view.frame.size.height-pickerHeight, width: self.view.frame.size.width, height: pickerHeight) )
self.view.addSubview(self.pickerviewObj);
pickerviewObj.backgroundColor = UIColor.white;
pickerviewObj.showsSelectionIndicator = true;
let toolBar = UIToolbar()
toolBar.barStyle = UIBarStyle.default;
toolBar.isTranslucent = true
toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
toolBar.sizeToFit()
self.view.addSubview(self.scrlview)
self.scrlview.addSubview(self.cotentView);
let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.plain, target: self, action: #selector(ViewController.DonePicker))
toolBar.setItems([ spaceButton, doneButton], animated: false)
toolBar.isUserInteractionEnabled = true
toolBar.frame = CGRect(x: 0, y: self.view.frame.size.height-pickerHeight-44, width: self.view.frame.size.width, height: 44);
self.view.addSubview(toolBar);
pickerviewObj.dataSource = self;
pickerviewObj.delegate = self;
//add constraints to PickerView
let constraintCenterX = NSLayoutConstraint(item: pickerviewObj, attribute: NSLayoutAttribute.centerX, relatedBy: NSLayoutRelation.equal, toItem: self.view , attribute: NSLayoutAttribute.centerX, multiplier: 1, constant:0);
let constraintBottom = NSLayoutConstraint(item: pickerviewObj, attribute: NSLayoutAttribute.bottom , relatedBy: NSLayoutRelation.equal, toItem: self.view , attribute: NSLayoutAttribute.bottom, multiplier: 1, constant:0);
let constraintWidth = NSLayoutConstraint(item: pickerviewObj, attribute: NSLayoutAttribute.width , relatedBy: NSLayoutRelation.equal, toItem: self.view , attribute: NSLayoutAttribute.width, multiplier: 1, constant:0);
let constraintHeight = NSLayoutConstraint(item: pickerviewObj, attribute: NSLayoutAttribute.height , relatedBy: NSLayoutRelation.equal, toItem: self.view , attribute: NSLayoutAttribute.height, multiplier: (200/568), constant:0);
//add constraints to ScrollView
let scrollconstraintCenterX = NSLayoutConstraint(item: self.scrlview, attribute: NSLayoutAttribute.centerX, relatedBy: NSLayoutRelation.equal, toItem: self.view , attribute: NSLayoutAttribute.centerX, multiplier: 1, constant:0);
let scrollconstraintBottom = NSLayoutConstraint(item: self.scrlview, attribute: NSLayoutAttribute.bottom , relatedBy: NSLayoutRelation.equal, toItem: toolBar , attribute: NSLayoutAttribute.top, multiplier: 1, constant:0);
let scrollconstraintWidth = NSLayoutConstraint(item: self.scrlview, attribute: NSLayoutAttribute.width , relatedBy: NSLayoutRelation.equal, toItem: self.view , attribute: NSLayoutAttribute.width, multiplier: 1, constant:0);
let scrollconstraintTop = NSLayoutConstraint(item: self.scrlview, attribute: NSLayoutAttribute.top , relatedBy: NSLayoutRelation.equal, toItem: self.view , attribute: NSLayoutAttribute.top, multiplier:1, constant:0);
//add constraints to ScrollView's contentView
let ContentViewconstrainttop = NSLayoutConstraint(item: self.cotentView, attribute: NSLayoutAttribute.top, relatedBy: NSLayoutRelation.equal, toItem: self.scrlview , attribute: NSLayoutAttribute.topMargin, multiplier: 1, constant:0);
let ContentViewconstraintBottom = NSLayoutConstraint(item: self.cotentView, attribute: NSLayoutAttribute.bottom , relatedBy: NSLayoutRelation.equal, toItem: self.scrlview , attribute: NSLayoutAttribute.bottomMargin, multiplier: 1, constant:0);
let ContentViewconstraintleft = NSLayoutConstraint(item: self.cotentView, attribute: NSLayoutAttribute.trailing , relatedBy: NSLayoutRelation.equal, toItem: self.scrlview , attribute: NSLayoutAttribute.trailing, multiplier: 1, constant:0);
let ContentViewconstraintright = NSLayoutConstraint(item: self.cotentView, attribute: NSLayoutAttribute.leading , relatedBy: NSLayoutRelation.equal, toItem: self.scrlview , attribute: NSLayoutAttribute.leading, multiplier: (200/568), constant:0);
let ContentViewconstraintWidth = NSLayoutConstraint(item: self.cotentView, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: self.scrlview , attribute: NSLayoutAttribute.width, multiplier: 1, constant:0);
self.ContentViewconstraintheight = NSLayoutConstraint(item: self.cotentView, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: nil , attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant:100);
//add constraints to toolBar
let toolconstraintCenterX = NSLayoutConstraint(item: toolBar, attribute: NSLayoutAttribute.centerX, relatedBy: NSLayoutRelation.equal, toItem: self.view , attribute: NSLayoutAttribute.centerX, multiplier: 1, constant:0);
let toolconstraintBottom = NSLayoutConstraint(item: toolBar, attribute: NSLayoutAttribute.bottom , relatedBy: NSLayoutRelation.equal, toItem: self.pickerviewObj , attribute: NSLayoutAttribute.top, multiplier: 1, constant:0);
let toolconstraintWidth = NSLayoutConstraint(item: toolBar, attribute: NSLayoutAttribute.width , relatedBy: NSLayoutRelation.equal, toItem: self.view , attribute: NSLayoutAttribute.width, multiplier: 1, constant:0);
//activare all constraints
NSLayoutConstraint.activate([constraintWidth,constraintHeight,constraintCenterX,constraintBottom,toolconstraintWidth,toolconstraintBottom,toolconstraintCenterX,scrollconstraintTop,scrollconstraintWidth,scrollconstraintCenterX,scrollconstraintBottom,ContentViewconstrainttop,ContentViewconstraintBottom,ContentViewconstraintleft,ContentViewconstraintright,ContentViewconstraintWidth,self.ContentViewconstraintheight]);
self.view.layoutSubviews()
self.disableAutoResizingMasks();
toolBar.translatesAutoresizingMaskIntoConstraints = false
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
}
func getSorted(s1 : Any , s2 : Any) -> Bool{
let str1 : String = s1 as! String
let str2 : String = s2 as! String
return Int(str1)! < Int(str2)!;
}
//custom Logics to Update UI
func addConstarintsToButton(btn : UIButton , yPos : CGFloat)
{
NSLayoutConstraint.deactivate(btn.constraints);
btn.removeConstraints(btn.constraints);
let width = ((self.view.frame.size.width-20)/2) - 30;
let height = self.getCalculatedHeightForScren(height: 40);
let constraintCenterX = NSLayoutConstraint(item: btn, attribute: NSLayoutAttribute.centerX, relatedBy: NSLayoutRelation.equal, toItem: self.scrlview , attribute: NSLayoutAttribute.centerX, multiplier: 1, constant:0);
let constrainttop = NSLayoutConstraint(item: btn, attribute: NSLayoutAttribute.top , relatedBy: NSLayoutRelation.equal, toItem: self.cotentView , attribute: NSLayoutAttribute.top, multiplier: 1, constant:yPos);
let constraintWidth = NSLayoutConstraint(item: btn, attribute: NSLayoutAttribute.width , relatedBy: NSLayoutRelation.equal, toItem: nil , attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: width);
let constraintHeight = NSLayoutConstraint(item: btn, attribute: NSLayoutAttribute.height , relatedBy: NSLayoutRelation.equal, toItem: nil , attribute: NSLayoutAttribute.notAnAttribute, multiplier: height, constant:height);
NSLayoutConstraint.activate([constraintCenterX, constrainttop,constraintWidth,constraintHeight])
btn.translatesAutoresizingMaskIntoConstraints = false
}
func updateUIElements(tag : Int)
{
let arrKeys : NSMutableArray = NSMutableArray(array: dctButtons.allKeys, copyItems: true)
let SortedKeys = arrKeys.sorted(by: getSorted)
var xPos :CGFloat = 10.0;
var yPos :CGFloat = 50.0;
let width = ((self.view.frame.size.width-20)/2) - 30;
let height = self.getCalculatedHeightForScren(height: 40);
xPos = (self.view.frame.size.width - width)/2;
UIView.animate(withDuration: 0.5, animations: {
if(tag > 0)
{
let vw = self.cotentView.viewWithTag(tag)
vw?.removeFromSuperview()
let vw1 = self.cotentView.viewWithTag(tag + 100)
vw1?.removeFromSuperview()
}
for key in SortedKeys {
let btn1 = self.dctButtons.object(forKey: key) as! UIButton
btn1.frame = CGRect( x:xPos, y:yPos,width:width,height:height);
if let testBtn = self.cotentView.viewWithTag(btn1.tag+100) as? UIButton
{
let btnCross = testBtn ;
btnCross.frame = CGRect(x: xPos + btn1.frame.size.width + 5, y: yPos, width: 20, height: height);
}
self.ContentViewconstraintheight.constant = btn1.frame.size.height + 100;
if let vw = self.cotentView.viewWithTag(btn1.tag) as? UIButton
{
vw.removeFromSuperview();
self.cotentView.addSubview(btn1);
self.addConstarintsToButton(btn: btn1, yPos: yPos);
}
else{
self.cotentView.addSubview(btn1);
self.addConstarintsToButton(btn: btn1, yPos: yPos);
}
yPos += height + 10
}
self.view.layoutSubviews()
self.ContentViewconstraintheight.constant = yPos ;
})
}
// Control event Methods....
func btnClick(sender: UIButton!)
{
SelctedTag=sender.tag;
print(SelctedTag)
if sender.isSelected
{
return;
}
sender.isSelected = true;
let ButtonClose = UIButton(frame: CGRect(x: sender.frame.origin.x + sender.frame.size.width + 5, y: sender.frame.origin.y, width: 20, height: sender.frame.size.height) )
ButtonClose.tag = sender.tag + 100;
ButtonClose.setTitle("X", for: UIControlState.normal)
ButtonClose.backgroundColor = UIColor.gray
ButtonClose.setTitleColor(UIColor.red, for: UIControlState.normal);
ButtonClose.isUserInteractionEnabled = true;
ButtonClose.addTarget(self, action: #selector(ViewController.btnClose(sender:)), for: UIControlEvents.touchUpInside);
self.cotentView.addSubview(ButtonClose);
let strVal = String(sender.tag)
self.arrdata.remove(strVal)
self.pickerviewObj.reloadComponent(0);
}
func DonePicker()
{
let selectedIndex = self.pickerviewObj.selectedRow(inComponent: 0);
if (arrdata.count == 0 || selectedIndex < 0 || selectedIndex > arrdata.count )
{
return;
}
let x : String = arrdata[selectedIndex] as! String
let tag = Int(x)!
if let vw = self.cotentView.viewWithTag(tag) as? UIButton
{
return;
}
let btn = UIButton(type: UIButtonType.system);
btn.isSelected = false;
btn.tag = tag
btn.backgroundColor = UIColor.black;
btn.setTitleColor(UIColor.white, for: UIControlState.normal)
btn.addTarget(self, action:#selector(ViewController.btnClick(sender:)), for: UIControlEvents.touchUpInside)
btn.setTitle("Field " + String(x), for: UIControlState.normal)
btn.setTitleColor(UIColor.white, for: UIControlState.normal)
btn.isUserInteractionEnabled = true;
btn.center = self.pickerviewObj.center;
dctButtons.setObject(btn, forKey: String(x) as NSCopying)
self.pickerviewObj.reloadComponent(0);
self.updateUIElements(tag: 0);
}
func btnClose(sender: UIButton!)
{
print((SelctedTag))
let key = String(sender.tag - 100);
dctButtons.removeObject(forKey: key);
arrdata.add( key)
let tmpArray = arrdata.sorted(by: getSorted)
arrdata.removeAllObjects();
arrdata.addObjects(from: tmpArray)
self.pickerviewObj.reloadComponent(0);
self.updateUIElements(tag: sender.tag - 100);
}
// Picker view Methods....
func numberOfComponents(in pickerView: UIPickerView) -> Int
{
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int
{
return arrdata.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?
{
let x : String = arrdata[row] as! String
return "Field " + x
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
// let x : Int = arrdata[row] as! Int
// arrButton.add(x)
// print(arrButton)
// self .numberOfButton(number: arrdata[row] as! Int)
// arrdata.removeObject(at: row)
// pickerView.reloadAllComponents()
}
}
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