Is it possible to pan an object that is behind another object?
Currently I have a imageview and a view with clear color and only a border around, that I can see the imageview. I want to achieve that the view with the border is always on top. Trough the view I want to pan the image view with pan gesture.
You can add Pan gesture to the view and apply the transformation to the imageView.
var translation = panGesture.translationInView(imageView)
panGesture.setTranslation(CGPointZero, inView: imageView)
Just set isUserInteractionEnabled false for upper view.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let bottomView = UIView.init(frame: .init(x: 100, y: 100, width: 300, height: 300))
bottomView.backgroundColor = .yellow
let upperView = UIView.init(frame: .init(x: 100, y: 100, width: 300, height: 300))
upperView.backgroundColor = .clear
upperView.layer.borderWidth = 1
upperView.layer.borderColor = UIColor.red.cgColor
upperView.isUserInteractionEnabled = false //<------------
view.addSubview(bottomView)
view.addSubview(upperView)
bottomView.addGestureRecognizer(UIPanGestureRecognizer.init(target: self, action: #selector(handle)))
}
#objc func handle() {
print("handletapgesture")
}
}
Related
I have a UILabel on the UICollectionViewCell. On the UILabel I've got a UITapGestureRecognizer attached. I'm trying to increase the tap area of the UITapGestureRecognizer on the UILabel when the width of the UILabel increases.
Here is the sample of the code:
class BusCell: UICollectionViewCell {
var bus: Bus!
var tapGesture: UITapGestureRecognizer!
#IBOutlet weak var nameLabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
addTapGestureToNameLabel()
}
// MARK: - UI
func addTapGestureToNameLabel() {
tapGesture = UITapGestureRecognizer(target: self, action: #selector(nameLabelDoubleTap(gesture:)))
tapGesture.numberOfTapsRequired = 2
nameLabel.addGestureRecognizer(tapGesture)
nameLabel.isUserInteractionEnabled = true
}
func configure(_ bus: Bus, isStereo: Bool = false) {
self.bus = bus
loadCellUI(bus: bus)
bus.updateBlock = { [weak self] in
guard let strongSelf = self else {
return
}
strongSelf.loadCellUI(bus: bus)
}
}
func loadCellUI(bus: Bus) {
nameLabel.frame = CGRect(x: CGFloat(0), y: yPosition, width: 122, height: self.nameLabel.frame.height)
if bus.isStereo {
if bus.index % 2 == 0 {
let frame = nameLabel.frame
nameLabel.frame = CGRect(x: frame.origin.x, y: frame.origin.y, width: 244, height: frame.height)
nameLabel.isHidden = false
// Make the tap frame same as the nameLabel's frame
} else {
nameLabel.isHidden = true
}
} else {
let frame = nameLabel.frame
nameLabel.frame = CGRect(x: frame.origin.x, y: frame.origin.y, width: 122, height: frame.height)
nameLabel.isHidden = false
// Make the tap frame same as the nameLabel's frame
}
}
}
How do I make this work?
A tap gesture recognizer attaches to a view, and responds to taps inside the frame of the view. It doesn't have a tap area of its own. If you increase the size of the label then the tap area should increase in size as well.
I remember reading a recommendation from Apple that a tappable area be at least 40x40 points. You might want to put an invisible view (call it tapView) on top of your label that is slightly larger than the label (You could get the label's frame, and call CGRect.inset(by:) with negative values for all the edges. Use the resulting rect as the tapView's frame, and add the tap view on top of your label.) If you do that then you should put code in your view controller's viewDidLayoutSubviews() method (and any time you change your nameLabel label) to adjust the tapView's frame.
In my project I have a pinch to resize option for the object that has been placed in scene view. But when someone pinch the screen to reduce or enlarge the actual size of the object I need to get that scale. I need to display the scale in which the object is being changed in the screen. How do I get the scale when the action is being performed?
Thank you
Within your main ViewController Class for the ARSCNView
declare the label view, and the label itself at the top.
let scaleLabel = UILabel(frame: CGRect(x: 0, y: 0, width: 300, 70))
let labelView = UIView(frame: CGRect(x: 300, y: 300, width: 300, height: 70))
Now within LoadView or ViewDidLoad you can set the attributes for the label such backgroundColor, textColor etc... and also add the view and label to sceneView.
// add your attributes for label,view
labelView.backgroundColor = .clear
scaleLabel.textColor = .white
scaleLabel.adjustsFontSizeToFitWidth
// add you views to sceneView
labelView.addSubview(scaleLabel)
sceneView.addSubview(labelView)
Lastly, with the pinch gesture function for scaling.. which should look something like this.
#objc func pinchGesture(_ gesture: UIPinchGestureRecognizer) {
if nodeYouScale != nil {
let action = SCNAction.scale(by: gesture.scale, duration: 0.1)
nodeYouScale.runAction(action)
gesture.scale = 1
// this part updates the label with the current scale factor
scaleLabel.text = "X: \(nodeYouScale.scale.x) Y: \(nodeYouScale.scale.y) Z:\(nodeYouScale.scale.z)"
} else {
return
}
Currently i am trying to create some kind of an imageviewer, where you can click on an image which is then displayed in full size. Now i want to add gestures to it to zoom. I want to understand and see how to add the pinch gesture to zoom in and out, to be able to pan around the image and to zoom in quickly with the double tap gesture. I did not found much good tutorials.
I know that you zoom into the view, not into the image. That is why you use a ScrollView containing an ImageView. Now what is missing to enable zooming, pinching and moving the image around?
Thank you in advance for any helpful post.
In the following is "my" current code base for this feature. What needs to be added?
class DetailViewController: UIViewController, UIScrollViewDelegate {
var scrollView: UIScrollView!
var imageView: UIImageView!
override func viewDidLoad()
{
super.viewDidLoad()
self.navigationController?.isNavigationBarHidden = false
scrollView=UIScrollView()
scrollView.frame = CGRect(x: 0, y: 0, width: self.view.frame.width, height: (self.view.frame.height - (self.navigationController?.navigationBar.frame.size.height)! + 44))
scrollView.minimumZoomScale=1
scrollView.maximumZoomScale=3
scrollView.bounces=false
scrollView.delegate=self
self.view.addSubview(scrollView)
imageView=UIImageView()
imageView.image = UIImage(named: "inlinelogo.jpg")
imageView.frame = CGRect(x: 0, y: 0, width: scrollView.frame.width, height: scrollView.frame.height - (44 + UIApplication.shared.statusBarFrame.size.height))
imageView.backgroundColor = .black
imageView.contentMode = .scaleAspectFit
scrollView.addSubview(imageView)
}
func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView?
{
return imageView
}
}
you missed the userInteractionEnabled property of UIImageView add
imageView.isuserInteractionEnabled = true
I added shadow to my table view but unfortunately when I scroll through the table view the shadow also moves with the table. The code for adding shadow is as follows:
func addShadow(to myView: UIView){
let shadowPath = UIBezierPath(rect: CGRect(x: 0, y: 0, width: uiView.frame.width, height: uiView.frame.height * 1.1))
uiView.layer.shadowColor = UIColor.black.cgColor
uiView.layer.shadowOffset = CGSize(width: 0.2, height: 0)
uiView.layer.shadowOpacity = 0.5
uiView.layer.shadowRadius = 5.0
uiView.layer.masksToBounds = false
uiView.layer.shadowPath = shadowPath.cgPath
}
Can you please explain to me why is this happening and how to make the shadow stick to its designated location?
Thank you in advance.
If you are adding shadow on tableView, it will scroll along with tableview data. To prevent that you have to add UIView first. Add tableview on that view. Add shadow for the UIView you have taken. It will stick to designated location.
This is my solution in Swift 3 with an UIView and a CAGradientLayer inside.
override func viewWillAppear(_ animated: Bool) {
addShadow(myView: myTab)
}
func addShadow(myView: UIView){
let shadowView = UIView()
shadowView.center = CGPoint(x: myView.frame.minX,y:myView.frame.minY - 15)
shadowView.frame.size = CGSize(width: myView.frame.width, height: 15)
let gradient = CAGradientLayer()
gradient.frame.size = shadowView.frame.size
let stopColor = UIColor.clear.cgColor
let startColor = UIColor.black.withAlphaComponent(0.8).cgColor
gradient.colors = [stopColor,startColor]
gradient.locations = [0.0,1.0]
shadowView.layer.addSublayer(gradient)
view.addSubview(shadowView)
}
In my app I'm using a custom UIActivityIndicator view (this) and it works great.
I have an UITableView and I want the indicator over the tableview on loading data. To solve the problem I have created an empty view with a background above all and when I need to start indicator's animation I simply hide tableview and show the empty view + the indicator.
The result is this:
I saw somewhere that I can use instead something like this:
How can I do?
Thanks in advance.
You could try adding a translucent Black view over the Table View and put the custom activity indicator code as a subview in the Black view.
let aBlackView = UIView(frame: CGRectMake(0, 0, self.view.bounds.width, self.view.bounds.height))
aBlackView.backgroundColor = UIColor.blackColor()
aBlackView.alpha = 0.75 // Change the alpha depending on how much transparency you require
let aMainWindow = UIApplication.sharedApplication().delegate!.window
aMainWindow!!.addSubview(aBlackView)
/* Enter you code for NVActivityIndicatorViewable here */
aBlackView.addSubview(/* NVActivityIndicatorViewable */)
Once you are done with your request, you can remove the Black view by calling this code:
aBlackView.removeFromSuperview()
I created a activity showing screen . I used in every where in my project.
//ProgressBarNotification.swift
import Foundation
import UIKit
class ProgressBarNotification {
internal static var strLabel = UILabel()
internal static var messageFrame = UIView()
internal static var activityIndicator = UIActivityIndicatorView()
internal static func progressBarDisplayer(msg:String,indicator:Bool ){
let view1 = UIApplication.sharedApplication().delegate?.window!!.rootViewController?.view
view1?.userInteractionEnabled = false
strLabel = UILabel(frame: CGRect(x: 50, y: 0, width: 200, height: 50))
strLabel.text = msg
strLabel.textColor = UIColor.whiteColor()
messageFrame = UIView(frame: CGRect(x: view1!.frame.midX - 90, y: view1!.frame.midY - 25 , width: 180, height: 50))
messageFrame.layer.cornerRadius = 15
messageFrame.backgroundColor = UIColor(white: 0, alpha: 0.7)
if indicator {
activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.White)
activityIndicator.frame = CGRect(x: 0, y: 0, width: 50, height: 50)
activityIndicator.startAnimating()
messageFrame.addSubview(activityIndicator)
}
messageFrame.addSubview(strLabel)
view1!.addSubview(messageFrame)
}
internal static func removeProgressBar() {
let view1 = UIApplication.sharedApplication().delegate?.window!!.rootViewController?.view
_ = view1?.subviews.filter({ (view) -> Bool in
if view == ProgressBarNotification.messageFrame {
view.removeFromSuperview()
}
return false
})
ProgressBarNotification.messageFrame.removeFromSuperview()
view1?.userInteractionEnabled = true
}
deinit{
}
}
Usage
//To start Loader
ProgressBarNotification.progressBarDisplayer("Loading", indicator: true)
//Stop
ProgressBarNotification.removeProgressBar()