like below Image..
I tried the below code...
import UIKit
class UploadsController: UICollectionViewController , Dimmable {
let dimLevel: CGFloat = 0.5
let dimSpeed: Double = 0.5
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
dim(.In, alpha: dimLevel, speed: dimSpeed)
}
#IBAction func unwindFromUploadEdit(segue: UIStoryboardSegue)
{
dim(.Out, speed:dimSpeed)
}
And connect the AnotherViewController present modally through the button on the cell of the CollectionViewController..
But it does not work..
after click on the button the AnotherViewController open/overlay on the entire CollectionViewController instead of cell of the CollectionViewController...
Plz. suggest me how can I do this I am new in Swift
Look at the frame of AnotherViewController after it is presented. Compare that to the frame of the cell in the CollectionViewController. You want the width and height to the be the same so that it only covers up that view. The x and y points are a bit more tricky. There is a method on UIView called convertRect:toView: . The origin of the cell is relative to the collection view. The origin of the AnotherViewController should be relative to the entire CollectionViewController's view. Use the mentioned method to determine where the cell is relative to its ViewController and use that information to make sure the overlay is the same size and in the same location of the cell.
Related
I have a view that opens another view Controller as popover
the popover uses an image picker and displays the chosen image in an imageView.
The parent also has an imageView with an IBoutlet named profiler and before dismissing the popover i would like the parent view to get the chosen image.
How would i go about accessing parent and sending the image from the popover to the parent view
below is code from the popover view controller:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
picker.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//MARK: - Delegates
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
{
let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage //2
myImageView.contentMode = .scaleAspectFit //3
myImageView.image = chosenImage //4
myImageView.layer.borderWidth = 1
myImageView.layer.masksToBounds = false
myImageView.layer.borderColor = UIColor.black.cgColor
myImageView.layer.cornerRadius = myImageView.frame.height/4
myImageView.clipsToBounds = true
dismiss(animated:true, completion: nil) //5
}
thanks for any help rendered
Use a callback closure, it's less effort than delegate/protocol
In the popover view controller add a property
weak var callback : ((UIImage) -> ())?
Call it in didFinishPickingMediaWithInfo before dismiss
callback?(chosenImage)
In the parent view controller after creating the controller add
popoverViewController.callback = { image in
// do something with the image
}
popoverViewController is the popover view controller instance
you should create protocol
protocol PopOverImagePickerDelegate: NSObjectProtocol {
func didSelect(image: UIImage)
}
inside your PopoverViewController create
weak var delegate: PopOverImagePickerDelegate?
before navigating to PopoverViewController from ParentViewController set
popOverViewController.delegate = self
and then create
extension ParentViewController: PopOverImagePickerDelegate {
func didSelect(image: UIImage) {
//do stuff
}
}
and when image picked inside PopoverViewController just call
self.delegate?.didSelect(image: image)
I tried to change default grey color of Tab Bar items, but Xcode finds error. I used some code, that code is:
import UIKit
extension UIImage {
func makeImageWithColorAndSize(color: UIColor, size: CGSize) -> UIImage {
UIGraphicsBeginImageContextWithOptions(size, false, 0)
color.setFill()
UIRectFill(CGRectMake(0, 0, size.width, size.height))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
class SecondViewController: UIViewController {
let tabBar = UITabBar()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
UITabBar.appearance().selectionIndicatorImage = UIImage().makeImageWithColorAndSize(UIColor.blueColor(), size: CGSizeMake(tabBar.frame.width/CGFloat(tabBar.items!.count), tabBar.frame.height))
}
So I put this in SecondViewController just as test, and when I run application on Xcode Simulator it crash and it show error in logs (console) fatal error: unexpectedly found nil while unwrapping an Optional value
I think problem is here:
UITabBar.appearance().selectionIndicatorImage = UIImage().makeImageWithColorAndSize(UIColor.blueColor(), size: CGSizeMake(tabBar.frame.width/CGFloat(tabBar.items!.count), tabBar.frame.height))
Because when I delete this part of code, error doesn't happen.
Can someone help me ?
The problem in your code that you create UITabBar object like let tabBar = UITabBar() and this object has no relation to the tabs which are located on the form. Your tabBar is a new empty object that contains no one UITabBarItem objects and when you call this:
UITabBar.appearance().selectionIndicatorImage = UIImage().makeImageWithColorAndSize(UIColor.blueColor(), size: CGSizeMake(tabBar.frame.width/CGFloat(tabBar.items!.count), tabBar.frame.height))
the error occurs when you try to do this: tabBar.items!.count. You're trying to unwrap optional items array [UITabBarItem]? and it nil becouse tabBar is empty object and have no items.
To fix this you need to get reference to UITabBar from current UITabBarController for example like this:
class SecondViewController: UIViewController {
var tabBar: UITabBar?
override func viewDidLoad() {
super.viewDidLoad()
tabBar = self.tabBarController!.tabBar
tabBar!.selectionIndicatorImage = UIImage().makeImageWithColorAndSize(UIColor.blueColor(), size: CGSizeMake(tabBar!.frame.width/CGFloat(tabBar!.items!.count), tabBar!.frame.height))
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
I'm using a TableView and have a custom TableViewCell that I've added a subview to.
The problem is that I need the subview's height to change sometimes and therefore, the table's contentView would have to be updated as well as the row's height.
The subview of the custom TableViewCell is represented by the yellow background.
These images show what's currently happening in my simulator.
On Load
After the event that causes the subview's height to increase
What's the best approach to take with something like this?
Should I use constraints? And if so, what kind of constraints should I use? Would I have to then reload the tableview too every time the subview's size changes?
Here is the code I'm currently using for my custom TableViewCell:
import UIKit
class CustomCell: UITableViewCell {
var newView: UIView!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
self.newView = UIView(frame: self.frame)
self.newView.backgroundColor = .yellowColor()
self.addSubview(newView)
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func layoutSubviews() {
super.layoutSubviews()
self.newView.frame.size.width = self.frame.size.width // because self.frame.width is different than it was in the init method
}
func somethingHappenedThatMySubviewHasToIncreaseInHeight() {
self.newView.frame.size.height = self.frame.size.height + 40
}
}
The best approach is to use Auto Layout and self-sizing cells. Setup constraints in storyboard for your custom cell.
You will not need to reload the tableView. Each cell will automatically adjust its height, based on how much vertical space its subview takes.
For more information, see the detailed walkthrough by smileyborg in his answer to Using Auto Layout in UITableView for dynamic cell layouts & variable row heights.
let label = UILabel(frame: CGRectMake(20.0, 20.0, 15.0, 15.0))
label.backgroundColor = UIColor.flamingoColor()
UIView.animateWithDuration(3.0, animations: {
cell.addSubview(label)
label.backgroundColor = UIColor.yellowColor()
})
This code I put inside tableView:cellForRowAtIndexPath: -> result is a subview that has a yellow background, but I haven't seen any animation. The same is for method tableView:didEndDisplayingCell:
Which method should I use or what kind of animation should I put there to see any animations inside UITableViewCell. I know that I cannot animate existing labels, because these are with constraints.
Firstly, you should move cell.addSubview(label) to outside of the animation block and add the label to the contentView of the cell.
Back to your problem. You can't animate the background colour of a UILabel. You could use a UIView, of the same size, behind the UILabel for the same effect though.
To get the UIView to change colour once it's appeared I used a UITableViewCell subclass:
class AnimatedCell : UITableViewCell {
let animatedView = UIView()
/* Setup by adding animatedView to the contentView and setting the
animated view's initial frame and colour.
*/
func animate() {
UIView.animateWithDuration(3.0) {
animatedView.backgroundColor = UIColor.redColor()
}
}
Then in your UITableViewController subclass, when the view controller is presented the UITableView will be populated so you need to animate those cells with:
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated: Bool)
for cell in tableView.visibleCells() as! [UITableViewCell] {
if let animatedCell = cell as? AnimatedCell {
animatedCell.animate()
}
}
}
Then, for cells that appear when you scroll:
override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
if let animatedCell = cell as? AnimatedCell {
a.animateLabel()
}
}
Also, you can animate with AutoLayout, you need to change the constant on the NSLayoutConstraint you want to animate. This gives a good example: iOS: How does one animate to new autolayout constraint (height)
I can able to do pinch zoom using pinch gesture using swift. But after image enlarges, i can't able view the which is out of view. (i.e)can't able to move image around the screen. Can any one help me?
My code:
#IBAction func scaleImage(sender: UIPinchGestureRecognizer) {
sender.view!.transform = CGAffineTransformScale(sender.view!.transform, sender.scale, sender.scale)
sender.scale = 1
}
I need to view full image after zooming it.
Add ScrollView and add image on scrollView
class ViewController:UIScrollViewDelegate{
#IBOutlet var imageView: UIImageView!
#IBOutlet var scroll: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
scroll.maximumZoomScale=4;
scroll.minimumZoomScale=1.0;
scroll.bounces=true;
scroll.bouncesZoom=true;
scroll.contentSize=CGSizeMake(imageView.frame.size.width, imageView.frame.size.height);
scroll.showsHorizontalScrollIndicator=true;
scroll.showsVerticalScrollIndicator=true;
scroll.delegate=self;//assigning delegate
self.scroll.addSubview(imageView);
self.view.addSubview(scroll);
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func viewForZoomingInScrollView(_ scrollView: UIScrollView) -> UIView?
{
return self.imageView
}
}