I have a TextView with some text, which font is Bold. And i´ve a button. When this button is tapped, the Bold Font should change to "UnBold"
There´s a ViewController & a class called "FontManager" to manage the Fonts of the TextKit/UITextView.
My code for the FontManager:
import UIKit
class FontManager {
var textView: UITextView! = nil
init(textView: UITextView) {
self.textView = textView
self.setFont()
}
// set a Range of the TextView to Bold at start:
func setFont() {
// set font to "HelveticaNeue"
let newFont = UIFont(name:"HelveticaNeue", size: textView.font!.pointSize)
self.textView.font = newFont
let range = NSMakeRange(11, 24)
self.makeBold(range)
}
// set attributes
func getDict(key : String, value: UIFont ) -> [String: AnyObject] {
return [key : value]
}
This code to set the Font to Bold in selectedRange works without problem
func makeBold(selectedRange: NSRange) {
self.addOrRemoveFontTraitWithName("Bold", andValue: UIFontDescriptorSymbolicTraits.TraitBold.rawValue, andRange:selectedRange)
}
func addOrRemoveFontTraitWithName(traitName: String, andValue traitValue: UInt32, andRange selectedRange: NSRange) {
let currentAttributesDict : NSDictionary! = self.textView.textStorage.attributesAtIndex(selectedRange.location, effectiveRange: nil)
let currentFont : UIFont = currentAttributesDict .objectForKey(NSFontAttributeName) as! UIFont
let fontDescriptor : UIFontDescriptor! = currentFont.fontDescriptor()
let fontNameAttribute : NSString = fontDescriptor.objectForKey(UIFontDescriptorNameAttribute) as! NSString
var existingTraitsWithNewTrait : UInt32! = nil
var changedFontDescriptor : UIFontDescriptor! = nil
Here is a check, if there is already bold text. If not (== NSNotFound) the text in selectedRange becomes the Bold "trait"
if fontNameAttribute.rangeOfString(traitName).location == NSNotFound {
existingTraitsWithNewTrait = fontDescriptor.symbolicTraits.rawValue | traitValue
changedFontDescriptor = fontDescriptor.fontDescriptorWithSymbolicTraits(UIFontDescriptorSymbolicTraits.TraitBold)
(1) if the Font in selectedRange is bold (else: != NSNotFound) the Font should be set to normal (UnBold)
} else {
existingTraitsWithNewTrait = fontDescriptor.symbolicTraits.rawValue & ~traitValue
changedFontDescriptor = fontDescriptor.fontDescriptorWithSymbolicTraits(UIFontDescriptorSymbolicTraits(rawValue: existingTraitsWithNewTrait))
}
let updatedFont = UIFont(descriptor:changedFontDescriptor, size: 0.0)
let dict = self.getDict(NSFontAttributeName, value: updatedFont)
self.textView.textStorage.beginEditing()
textView.textStorage.setAttributes(dict, range: selectedRange)
self.textView.textStorage.endEditing()
}
And now the Code of the ViewController:
class ViewController: UIViewController {
#IBOutlet weak var textView: UITextView!
var fontManger: FontManager! = nil
// the #IBAction to change the Font
#IBAction func SwitchFont(sender: AnyObject) {
let range = NSMakeRange(11, 24)
fontManger.makeBold(range)
}
#IBOutlet weak var textView: UITextView!
var fontManger: FontManager! = nil
override func viewDidLoad() {
super.viewDidLoad()
// init the FontManager
fontManger = FontManager(textView: self.textView)
}
At the first Tap of the button there should be a skip to (1), the else...
But this doesn´t happen. Can see that in debug mode???
Any idea is welcome!
download project
Found it! The Bold-Font is "HelveticaNeue-Bold". The "UnBold"-Font is "HelveticaNeue-Medium" but not "HelveticaNeue" and this difference is almost unvisible!
See no other way as adding
var updatedFont = UIFont(descriptor:changedFontDescriptor, size: 0.0)
if updatedFont.fontName == "HelveticaNeue-Medium" {
updatedFont = UIFont(name:"HelveticaNeue", size: textView.font!.pointSize)!
}
Or do u see a better solution?
Related
I want to get geotag location from image which is selected from image picker. I am using this code
if picker.sourceType == UIImagePickerControllerSourceType.PhotoLibrary
{
if let currentLat = pickedLat as CLLocationDegrees?
{
self.latitude = pickedLat!
self.longitude = pickedLong!
}
else
{
var library = ALAssetsLibrary()
library.enumerateGroupsWithTypes(ALAssetsGroupAll, usingBlock: { (group, stop) -> Void in
if (group != nil) {
println("Group is not nil")
println(group.valueForProperty(ALAssetsGroupPropertyName))
group.enumerateAssetsUsingBlock { (asset, index, stop) in
if asset != nil
{
if let location: CLLocation = asset.valueForProperty(ALAssetPropertyLocation) as CLLocation!
{ let lat = location.coordinate.latitude
let long = location.coordinate.longitude
self.latitude = lat
self.longitude = lat
println(lat)
println(long)
}
}
}
} else
{
println("The group is empty!")
}
})
{ (error) -> Void in
println("problem loading albums: \(error)")
}
}
}
i want to know to covert this code in swift 3 .I am new in coding with swift 3 .It will be very helpful
After hours of searching i got my ans
import UIKit
import Photos
class ViewController: UIViewController,UIImagePickerControllerDelegate, UINavigationControllerDelegate {
#IBOutlet weak var imageView: UIImageView!
#IBOutlet weak var locationLabel: UILabel!
#IBOutlet weak var timeLabel: UILabel!
#IBOutlet weak var logi: UILabel!
#IBOutlet weak var lati: UILabel!
var lat = String()
var log = String()
var location = String()
var timeTaken = "Not Known"
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func imagegeo(_ sender: Any) {
let imagePicker = UIImagePickerController()
imagePicker.sourceType = .photoLibrary
imagePicker.delegate = self
present(imagePicker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
var chosenImage:UIImage?
if let URL = info[UIImagePickerControllerReferenceURL] as? URL {
print("We got the URL as \(URL)")
let opts = PHFetchOptions()
opts.fetchLimit = 1
let assets = PHAsset.fetchAssets(withALAssetURLs: [URL], options: opts)
print(assets)
for assetIndex in 0..<assets.count {
let asset = assets[assetIndex]
location = String(describing: asset.location)
log = String(describing: asset.location?.coordinate.longitude)
lat = String(describing: asset.location?.coordinate.latitude)
timeTaken = (asset.creationDate?.description)!
print(log)
print(location)
print(lat)
}
}
if let editedImage = info[UIImagePickerControllerEditedImage] as? UIImage {
chosenImage = editedImage
} else if let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
chosenImage = selectedImage
}
dismiss(animated: true) {
DispatchQueue.main.async {
self.imageView.image = chosenImage
self.timeLabel.text = self.timeTaken
self.locationLabel.text = self.location
self.lati.text = self.lat
self.logi.text = self.log
}
}
}
}
My app retrieves image from URL, but I need to change the image size before it appears on the user interface in my tableview.
this is my code in my tableViewController:
import UIKit
import Firebase
import Alamofire
class FeedViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextFieldDelegate {
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var postField: MaterialTextField!
#IBOutlet weak var imageSelectorImage: UIImageView!
var posts = [Post]()
var imageSelected = false
var imagePicker: UIImagePickerController!
static var imageCache = NSCache()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
postField.delegate = self
//tableView.estimatedRowHeight = 400
//tableView.rowHeight = UITableViewAutomaticDimension
imagePicker = UIImagePickerController()
imagePicker.delegate = self
DataService.ds.REF_POSTS.queryOrderedByChild("timestamp").observeEventType(.Value, withBlock: { snapshot in
self.posts = []
if let snapshots = snapshot.children.allObjects as? [FDataSnapshot] {
for snap in snapshots {
if let postDict = snap.value as? Dictionary<String, AnyObject> {
let key = snap.key
let post = Post(postKey: key, dictionary: postDict)
self.posts.insert(post, atIndex: 0)
}
}
}
self.tableView.reloadData()
})
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
/**
* Called when the user click on the view (outside the UITextField).
*/
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
self.view.endEditing(true)
}
func textFieldDidBeginEditing(textField: UITextField) {
animateViewMoving(true, moveValue: 167)
}
func textFieldDidEndEditing(textField: UITextField) {
animateViewMoving(false, moveValue: 167)
}
func animateViewMoving (up:Bool, moveValue :CGFloat){
let movementDuration:NSTimeInterval = 0.1
let movement:CGFloat = ( up ? -moveValue : moveValue)
UIView.beginAnimations( "animateView", context: nil)
UIView.setAnimationBeginsFromCurrentState(true)
UIView.setAnimationDuration(movementDuration )
self.view.frame = CGRectOffset(self.view.frame, 0, movement)
UIView.commitAnimations()
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let post = posts[indexPath.row]
print(post.postDescription)
if let cell = tableView.dequeueReusableCellWithIdentifier("PostCell") as? PostCell {
cell.request?.cancel()
var img: UIImage?
if let url = post.imageUrl {
img = FeedViewController.imageCache.objectForKey(url) as? UIImage
}
cell.configureCell(post, img: img)
return cell
} else {
return PostCell()
}
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
imagePicker.dismissViewControllerAnimated(true, completion: nil)
imageSelectorImage.image = image
imageSelected = true
}
#IBAction func selectImage(sender: UITapGestureRecognizer) {
presentViewController(imagePicker, animated: true, completion: nil)
}
#IBAction func makePost(sender: AnyObject) {
//TODO: Add loading spinner while data is being processed
if let txt = postField.text where txt != "" {
if let img = imageSelectorImage.image where imageSelected == true {
let urlStr = URL_IMGSHACK
let url = NSURL(string: urlStr)!
//FIXME: Add error handling
let imgData = UIImageJPEGRepresentation(img, 0.2)!
let keyData = API_KEY_IMG.dataUsingEncoding(NSUTF8StringEncoding)!
let keyJSON = "json".dataUsingEncoding(NSUTF8StringEncoding)!
Alamofire.upload(.POST, url, multipartFormData: { multipartFormData in
multipartFormData.appendBodyPart(data: imgData, name: "fileupload", fileName: "image",
mimeType: "image/jpg")
multipartFormData.appendBodyPart(data: keyData, name: "key")
multipartFormData.appendBodyPart(data: keyJSON, name: "format")
}) { encodingResult in
switch encodingResult {
case .Success(let upload, _, _):
upload.responseJSON(completionHandler: { response in
if let info = response.result.value as? Dictionary<String, AnyObject> {
if let links = info["links"] as? Dictionary<String, AnyObject>{
if let imgLink = links["image_link"] as? String {
print("LINK: \(imgLink)")
self.postToFirebase(imgLink)
}
}
}
})
case .Failure(let error):
print(error)
}
}
} else {
self.postToFirebase(nil)
}
}
}
func postToFirebase(imgUrl: String?) {
var post: Dictionary<String, AnyObject> = [
"timestamp": NSNumber(longLong: currentTimeMillis()),
"description": postField.text!,
"likes": 0
]
if imgUrl != nil {
post["imageUrl"] = imgUrl!
}
let firebasePost = DataService.ds.REF_POSTS.childByAutoId()
firebasePost.setValue(post)
postField.text = ""
imageSelectorImage.image = UIImage(named: "camera")
imageSelected = false
tableView.reloadData()
postField.resignFirstResponder()
}
func currentTimeMillis() ->Int64 {
let nowDouble = NSDate().timeIntervalSince1970
return Int64(nowDouble * 1000)
}
}
and here my custom cell:
class PostCell: UITableViewCell {
#IBOutlet weak var profileImage: UIImageView!
#IBOutlet weak var showcaseImage: UIImageView!
#IBOutlet weak var descriptionText: UILabel!
#IBOutlet weak var likesLabel: UILabel!
#IBOutlet weak var likeImage: UIImageView!
var post: Post!
var request: Request?
var likeRef: Firebase!
override func awakeFromNib() {
super.awakeFromNib()
let tap = UITapGestureRecognizer(target: self, action: "likeTapped:")
tap.numberOfTapsRequired = 1
likeImage.addGestureRecognizer(tap)
likeImage.userInteractionEnabled = true
}
override func drawRect(rect: CGRect) {
profileImage.layer.cornerRadius = self.profileImage.frame.size.width / 2
profileImage.backgroundColor = UIColor.clearColor()
profileImage.layer.borderWidth = 2
profileImage.layer.borderColor = UIColor.whiteColor().CGColor
self.profileImage.clipsToBounds = true
self.showcaseImage.clipsToBounds = true
}
func configureCell(post: Post, img: UIImage?){
self.post = post
likeRef = DataService.ds.REF_USERS_CURRENT.childByAppendingPath("likes").childByAppendingPath(post.postKey)
self.descriptionText.text = post.postDescription
self.likesLabel.text = "\(post.likes)"
if post.imageUrl != nil {
if img != nil {
self.showcaseImage.image = img
} else {
request = Alamofire.request(.GET, post.imageUrl!).validate(contentType: ["image/*"]).response(completionHandler: { request, response, data, err in
if err == nil {
let img = UIImage(data: data!)!
self.showcaseImage.image = img
FeedViewController.imageCache.setObject(img, forKey: self.post.imageUrl!)
} else {
print(err.debugDescription)
}
})
}
} else {
self.showcaseImage.hidden = true
}
likeRef.observeSingleEventOfType(.Value, withBlock: { snapshot in
if let doesNotExist = snapshot.value as?
NSNull {
//This mean we have not liked this specific post
self.likeImage.image = UIImage(named: "heart-empty")
} else {
self.likeImage.image = UIImage(named: "heart-full")
}
})
}
func likeTapped(sender: UITapGestureRecognizer) {
likeRef.observeSingleEventOfType(.Value, withBlock: { snapshot in
if let doesNotExist = snapshot.value as?
NSNull {
self.likeImage.image = UIImage(named: "heart-full")
self.post.adjustLikes(true)
self.likeRef.setValue(true)
} else {
self.likeImage.image = UIImage(named: "heart-empty")
self.post.adjustLikes(false)
self.likeRef.removeValue()
}
})
}
}
this example for what i want to achieve:
this when user post the portrait image
this when user post the landscape image
The point is that I want my image width to always fit the width of device screen, and the height of the uiimage will be dynamic.
so when user post any image with any orientation ( landscape or portrait ), the image will fit the width of the screen, the height will be dynamic.
please help me give the detail where to put your method since i am a newbie about this, how to achieve what i want... im so desperated, is already 1 month and im so stuck about this...
You need to add imageview to storyboard from interface builder in Xcode,then you can set its constraints to fit size of the screen,& also add height constraints which you can change later when you retrieve image from url
I use uipageViewController for sliding pages. Each page has own ViewController:ContentViewController. In one of page I have button. When user click on this button it should go to another ViewController (let say home page). When I click on the button it change state, but redirection doesn't work. It seems that smth wrong with pushViewController?
Here is my code ::
class ViewController: UIViewController, UIPageViewControllerDataSource {
var pageViewController : UIPageViewController!
var pageTitles : NSArray!
var pageImages : NSArray!
let controllers = ["FirstViewController","SecondViewController"]
#IBOutlet weak var restartButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
self.pageTitles = NSArray(objects: "Explore", "Today Widget")
self.pageImages = NSArray(objects: "page1","page2")
self.pageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PageViewController")as! UIPageViewController
self.pageViewController.dataSource = self
var startVC = self.viewControllerAtIndex(0)as ContentViewController
var viewControllers = NSArray(object: startVC)
self.pageViewController.setViewControllers(viewControllers as! [UIViewController], direction: .Forward, animated: true, completion: nil)
self.pageViewController.view.frame = CGRectMake(0,40,self.view.frame.width,self.view.frame.height - 60)
self.addChildViewController(self.pageViewController)
self.view.addSubview(self.pageViewController.view)
self.pageViewController.didMoveToParentViewController(self)
self.view.backgroundColor = UIColor(red: (25/255.0), green: (127/255.0), blue: (216/255.0), alpha: 1.0)
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func restartAction(sender: AnyObject) {
var startVC = self.viewControllerAtIndex(0)as ContentViewController
var viewControllers = NSArray (object: startVC)
self.pageViewController.setViewControllers(viewControllers as! [UIViewController], direction: .Forward, animated: true, completion: nil)
}
func viewControllerAtIndex(index : Int)->ContentViewController
{
if (self.pageTitles.count == 0) || (index >= self.pageTitles.count){
return ContentViewController();
}
var vc:ContentViewController = self.storyboard?.instantiateViewControllerWithIdentifier("ContentViewController")as! ContentViewController
vc = self.storyboard?.instantiateViewControllerWithIdentifier(controllers[index])as! ContentViewController
vc.pageIndex = index
return vc;
}
func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
var vc = viewController as! ContentViewController
var index = vc.pageIndex as Int
if (index == 0 || index == NSNotFound){
return nil
}
index--
return self.viewControllerAtIndex(index);
}
func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
var vc = viewController as! ContentViewController
var index = vc.pageIndex as Int
if (index == NSNotFound){
return nil
}
index++
if (index == self.pageTitles.count){
return nil
}
return self.viewControllerAtIndex(index)
}
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
return self.pageTitles.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
return 0
}
}
#IBAction func secondViewController(sender: AnyObject) {
let next = self.storyboard?.instantiateViewControllerWithIdentifier("ThirdViewController") as? ThirdViewController
navigationController?.pushViewController(next!,animated: true)
}
I am creating a page view application. I have written code for the ViewController:
import UIKit
class ViewController: UIViewController {
var pageViewController : UIPageViewController!
var pageTitles : NSArray!
var pageImages : NSArray!
#IBAction func restartAction(sender: AnyObject) {}
override func viewDidLoad() {
super.viewDidLoad()
self.pageTitles = NSArray(objects: "This Is Page One!", "This Is Page Two!")
self.pageImages = NSArray(objects: "page1", "page2")
self.pageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PageViewController") as! UIPageViewController
self.pageViewController.dataSource = self // <–– Error
let startVC = self.viewControllerAtIndex(0) as ContentViewController
let viewControllers = NSArray(object: startVC)
self.pageViewController.setViewControllers(viewControllers as? [UIViewController], direction: .Forward, animated: true, completion: nil)
self.pageViewController.view.frame = CGRectMake(0, 30, self.view.frame.width, self.view.frame.height - 60)
self.addChildViewController(self.pageViewController)
self.view.addSubview(self.pageViewController.view)
self.pageViewController.didMoveToParentViewController(self)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func viewControllerAtIndex(index: Int) -> ContentViewController {
if ((self.pageTitles.count == 0) || (index >= self.pageTitles.count)) {
return ContentViewController()
}
let vc : ContentViewController = self.storyboard?.instantiateViewControllerWithIdentifier("ContentViewController") as! ContentViewController
vc.imageFile = self.pageImages[index] as! String
vc.titleText = self.pageTitles[index] as! String
vc.pageIndex = index
return vc
}
func pageViewController(pageViewController: UIPageViewController, viewcontrollerBeforeViewController viewController: UIViewController) ->UIViewController? {
let vc = viewController as! ContentViewController
var index = vc.pageIndex as Int
if index == 0 || index == NSNotFound {
return nil
}
index--
return self.viewControllerAtIndex(index)
}
func pageViewController(pageViewController: UIPageViewController, viewcontrollerAfterViewController viewController: UIViewController) ->UIViewController? {
let vc = viewController as! ContentViewController
var index = vc.pageIndex as Int
if index == NSNotFound {
return nil
}
index++
if index == self.pageTitles.count {
return nil
}
return self.viewControllerAtIndex(index)
}
}
But I am getting an error on this line self.pageViewController.dataSource = self. The error is:
Cannot assign to property: 'self' is immutable
I am unsure of why self is immutable and how to fix it. If someone could please help, thanks in advance.
In swift you'll need to call self.pageViewController.setDelegate(self)
Delegates have been declared as methods, not properties in some cases
I think the compiler is not being very helpful here - try declaring the controller as following datasource protocol and see if that fixes this odd error
class ViewController: UIViewController, UIPageViewControllerDataSource { etc
I have a UIPageViewController and a UIButton under it. Here is the screenshot of my storyboard.
When I build the app, the button is huge:
All of my constraints were set automatically. I tried to specify the height, but it doesn't help. Any ideas?
P.S. I'm using XCode 6.3.
Edit:
ViewController.swift:
import UIKit
class ViewController: UIViewController, UIPageViewControllerDataSource {
#IBOutlet weak var restartButton: UIButton!
var pageViewController: UIPageViewController!
var pageTitles: NSArray!
var pageImages: NSArray!
override func viewDidLoad() {
super.viewDidLoad()
self.pageTitles = NSArray(objects: "Page 1", "Page 2")
self.pageImages = NSArray(objects: "algorithm", "apoint")
self.pageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PageViewController") as! UIPageViewController
self.pageViewController.dataSource = self
var startVC = self.viewControllerAtIndex(0) as ContentViewController
var viewControllers = NSArray(object: startVC)
self.pageViewController.setViewControllers(viewControllers as [AnyObject], direction: .Forward, animated: true, completion: nil)
self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.width, self.view.frame.size.height - restartButton.frame.height)
self.addChildViewController(self.pageViewController)
self.view.addSubview(self.pageViewController.view)
self.pageViewController.didMoveToParentViewController(self)
self.view.sendSubviewToBack(self.pageViewController.view)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func viewControllerAtIndex(index: Int) -> ContentViewController {
if ((self.pageTitles.count == 0) || (index >= self.pageTitles.count)) {
return ContentViewController()
}
var vc: ContentViewController = self.storyboard?.instantiateViewControllerWithIdentifier("ContentViewController") as! ContentViewController
vc.imageFile = self.pageImages[index] as! String
vc.titleText = self.pageTitles[index] as! String
vc.pageIndex = index
return vc
}
#IBAction func restartAction(sender: AnyObject) {
var startVC = self.viewControllerAtIndex(0) as ContentViewController
var viewControllers = NSArray(object: startVC)
self.pageViewController.setViewControllers(viewControllers as [AnyObject], direction: .Forward, animated: true, completion: nil)
}
func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
var vc = viewController as! ContentViewController
var index = vc.pageIndex as Int
if (index == 0) || (index == NSNotFound) {
return nil
}
index--
return self.viewControllerAtIndex(index)
}
func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
var vc = viewController as! ContentViewController
var index = vc.pageIndex as Int
if index == NSNotFound {
return nil
}
index++
if index == self.pageTitles.count {
return nil
}
return self.viewControllerAtIndex(index)
}
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
return self.pageTitles.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
return 0
}
}
I'm going to guess that the problem is that you have a constraint from the top of the button to something else in the interface. Get rid of that constraint. The only constraints you need for a button at the bottom of the screen are its bottom and its right-or-left-or-center - its width and height are automatic.
You'll want to find your button in your Controller Scene like this, highlight your constraints and delete them.
Personally when I have constraint issues, I start from scratch by deleting all of the constraints across the board. This is just my personal approach.
Next thing I do is start with the item at the top of my storyboard view and set its constraints like this:
Notice in my add constraints window i am only selecting the top and left margins and the width and height. I do this to each of my objects starting from the top of the screen and working my way to the bottom.
Obviously you'll need to play with this feature a bit to get your desired results. Please note that what I've provided is just an example and not a fix-all.
edit:
after reading your comment I am not sure this solution will help you, I didn't realize that you made your button programmatically. I'm going to leave it up for the time being.