I would like to expand an view when I switch a switch to on, and to collapse when I switch the switch to off. At the same time all the other elements I have in my design have to move down or up.
Here is how the layout looks like when the switches are OFF
And here is how the layout looks like when the switches are ON:
I hope you understand what I am trying to do.
And the question... How do I do that???
It's much easier to do with AutoLayout and inside InterfaceBuilder (with a xib or storyboard), so foremost familiarize yourself with them if needed.
Clip Subviews.Make sure to implement that method so that when the value changes, based on the change you toggle-animate the height constraint (the IBOutlet)
self.firstHeightConstraint.constant = on ? 200.0 : 0.0
self.view.setNeedsUpdateConstraints()
UIView.animateWithDuration( ...
options:.BeginFromCurrentState,
animations: { self.view.layoutIfNeeded() } ...
)
Using UIView, it's not a good way. You should use UITableView instead of views.
Using TableView, you can add UISwitch with title according to the first image, in UITableView's header and return required number of rows in changed section in TableView on state ON and return the number of rows 0 on state OFF.
Still an issue, please let me know I'll help you.
I know my code isnt the cleanest, but it bothers me when answers tell the questioner its not a good way or do it this way instead. I am offering a solution NOT using table views or constraints:
In your example, you can use tags for each "level" that needs to be moved. So starting with switch 2 and all views below that, you would have a tag for that level (the second hidden collapsable view would have a tag of 2 as well), then switch 3 would have a tag of 3.
For the labels hidden, you are adding them to a subview i call insideView1 or insideView2. The frames of those inside views should have the proper minX, minY and width, but have a height of 0 to start. Also importantly they have layer.masksToBounds = false, so their subviews dont show when their height is 0. We then animate the height changing to the proper height (expanding), as well as all subviews under changing position.
Lastly i made a dictionary to keep track of when a section is expanded so you can use the same function to expand/collapse other areas while one is already expanded.
import UIKit
class ExpandViewController: UIViewController {
var insideView1 = UIView()
var insideView2 = UIView()
var expand = [1:true,2:true]
@objc func expandCollapse(_ sender : UIButton) {
var heightChange = CGFloat(0)
switch sender.tag {
case 1:
heightChange = 90
default:
heightChange = 90
}
var viewsToExpand = [UIView(),insideView1,insideView2]
UIView.animate(withDuration: 1.0) { [self] in
let expandMe = viewsToExpand[sender.tag]
if expand[sender.tag] == true {
expandMe.frame.size.height = heightChange
for v in view.subviews {
if v.tag > sender.tag {
v.center.y += heightChange
}
}
} else {
expandMe.frame.size.height = 0
for v in view.subviews {
if v.tag > sender.tag {
v.center.y -= heightChange
}
}
}
expand[sender.tag] = !expand[sender.tag]!
}
}
override func viewDidLoad() {
super.viewDidLoad()
let switcher1 = UISwitch()
switcher1.tag = 1
switcher1.isOn = false
switcher1.frame = CGRect(x: view.bounds.width - 150, y: 100, width: 40, height: 30)
switcher1.addTarget(self, action: #selector(expandCollapse(_:)), for: .allTouchEvents)
view.addSubview(switcher1)
let switchLabel1 = UILabel()
switchLabel1.tag = 1
switchLabel1.text = "Switch 1"
switchLabel1.frame = CGRect(x: 30, y: 0, width: view.bounds.width, height: 30)
switchLabel1.center.y = switcher1.center.y
view.addSubview(switchLabel1)
let switcher2 = UISwitch()
switcher2.tag = 2
switcher2.isOn = false
switcher2.frame = CGRect(x: view.bounds.width - 150, y: 140, width: 40, height: 30)
switcher2.addTarget(self, action: #selector(expandCollapse(_:)), for: .allTouchEvents)
view.addSubview(switcher2)
let switchLabel2 = UILabel()
switchLabel2.tag = 2
switchLabel2.text = "Switch 2"
switchLabel2.frame = CGRect(x: 30, y: 0, width: view.bounds.width, height: 30)
switchLabel2.center.y = switcher2.center.y
view.addSubview(switchLabel2)
let switcher3 = UISwitch()
switcher3.tag = 3
switcher3.isOn = false
switcher3.frame = CGRect(x: view.bounds.width - 150, y: 180, width: 40, height: 30)
// switcher3.addTarget(self, action: #selector(expandCollapse(_:)), for: .allTouchEvents)
view.addSubview(switcher3)
let switchLabel3 = UILabel()
switchLabel3.tag = 3
switchLabel3.text = "Switch 3"
switchLabel3.frame = CGRect(x: 30, y: 0, width: view.bounds.width, height: 30)
switchLabel3.center.y = switcher3.center.y
view.addSubview(switchLabel3)
insideView1.frame = CGRect(x: 0, y: switcher1.frame.maxY + 5, width: view.bounds.width, height: 0)
insideView1.layer.backgroundColor = UIColor.lightGray.cgColor
insideView1.layer.masksToBounds = true
insideView1.tag = 1
view.addSubview(insideView1)
insideView2.frame = CGRect(x: 0, y: switcher2.frame.maxY + 5, width: view.bounds.width, height: 0)
insideView2.layer.backgroundColor = UIColor.lightGray.cgColor
insideView2.layer.masksToBounds = true
insideView2.tag = 2
view.addSubview(insideView2)
let insideLabel1 = UILabel()
insideLabel1.text = "Label"
insideLabel1.frame = CGRect(x: 60, y: 10, width: view.bounds.width, height: 30)
insideView1.addSubview(insideLabel1)
let insideTextField1 = UITextField()
insideTextField1.frame = CGRect(x: 200, y: 0, width: view.bounds.width - 240, height: 30)
insideTextField1.center.y = insideLabel1.center.y
insideTextField1.layer.backgroundColor = UIColor.white.cgColor
insideView1.addSubview(insideTextField1)
let insideLabel2 = UILabel()
insideLabel2.text = "Label"
insideLabel2.frame = CGRect(x: 60, y: 50, width: view.bounds.width, height: 30)
insideView1.addSubview(insideLabel2)
let insideTextField2 = UITextField()
insideTextField2.frame = CGRect(x: 200, y: 0, width: view.bounds.width - 240, height: 30)
insideTextField2.center.y = insideLabel2.center.y
insideTextField2.layer.backgroundColor = UIColor.white.cgColor
insideView1.addSubview(insideTextField2)
let insideLabel3 = UILabel()
insideLabel3.text = "Label"
insideLabel3.frame = CGRect(x: 60, y: 10, width: view.bounds.width, height: 30)
insideView2.addSubview(insideLabel3)
let insideTextField3 = UITextField()
insideTextField3.frame = CGRect(x: 200, y: 0, width: view.bounds.width - 240, height: 30)
insideTextField3.center.y = insideLabel3.center.y
insideTextField3.layer.backgroundColor = UIColor.white.cgColor
insideView2.addSubview(insideTextField3)
let insideLabel4 = UILabel()
insideLabel4.text = "Label"
insideLabel4.frame = CGRect(x: 60, y: 50, width: view.bounds.width, height: 30)
insideView2.addSubview(insideLabel4)
let insideTextField4 = UITextField()
insideTextField4.frame = CGRect(x: 200, y: 0, width: view.bounds.width - 240, height: 30)
insideTextField4.center.y = insideLabel4.center.y
insideTextField4.layer.backgroundColor = UIColor.white.cgColor
insideView2.addSubview(insideTextField4)
}
}
