How to measure latency in iOS

Is there away to measure latency for one specific page?

Can I do some requests and calculate the average to know the latency?

NSDateFormatter string to date conversion

I need to convert

3/27/2015 5:45:00 AM

string into an NSDate object.

I tried this;

[dateFormatter setDateFormat:@"MM/dd/yyyy hh:mm:ss a"];

but it does not work.

What might be wrong that i could not figure out?

Thanks

Location permission alert on iPhone with Cordova

I'm working on a cordova app on which I have to locate the user latitude and longitude. Using the geolocation plugin, it works fine on android devices but it display an alert asking for permission from user in iOS. When I used the simulator I get this alert message:

Users/user/Library/Developer/CoreSimulator/Devices/783A2EFD-2976-448C-8E4E-841C985D337D/data/Containers/Bundle/Application/EFC846BB-4BA3-465C-BD44-575582E649FC/app_name.app/www/index.html would like to use your current location.

I have seen topic talking about this problem like: this but none of the provided solutions works for me.

this is my geolocation function:

function loadMyCoordonnee() {
if (navigator.geolocation) {
    navigator.geolocation
            .getCurrentPosition(
                    function(position) {
                        var myLatlng = new google.maps.LatLng(
                                position.coords.latitude,
                                position.coords.longitude);
                        window.localStorage.setItem("lattitude",
                                position.coords.latitude);

                        window.localStorage.setItem("longitude",
                                position.coords.longitude);
                        console.log('lattitude : '
                                + window.localStorage.getItem("lattitude"));
                        console.log('longitude : '
                                + window.localStorage.getItem("longitude"));
                    }, function(error) {

                        var myLatlng = new google.maps.LatLng(
                                47.120547402337465, 2.651801171874922);
                        window.localStorage.setItem("lattitude",
                                47.1205474023374655);
                        window.localStorage.setItem("longitude",
                                2.651801171874922);

                    });
} else {

    window.location = "index.html";
  }
   }

and here where I called this function:

var app = {

initialize: function() {
    this.bindEvents();
},

bindEvents: function() {
    document.addEventListener('deviceready', this.onDeviceReady, false);
},

 onDeviceReady: function() {
     loadMyCoordonnee();
          //app.receivedEvent('deviceready');

},

receivedEvent: function(id) {
    var parentElement = document.getElementById(id);
    var listeningElement = parentElement.querySelector('.listening');
    var receivedElement = parentElement.querySelector('.received');

    listeningElement.setAttribute('style', 'display:none;');
    receivedElement.setAttribute('style', 'display:block;');

    console.log('Received Event: ' + id);
}
 };

app.initialize();

Is there any way to change the text of the alert or to disable this alert?

iOS UICollectionView Photo Gallery Orientation issue

I'm currently working on implementing a horizontally scrollable photo gallery feature. For this, I'm using UICollectionView with the flow layout set to horizontal. The problem that I'm currently facing is with the orientation. Lets say, I launched this view in landscape and i scrolled across couple of photos and now if change orientation to portrait, i'm loosing the position where i was before in the landscape mode. i want to make sure i show the same photo centered vertically that i have before changing the orientation. please find the included source code below.

class ViewController: UIViewController, UICollectionViewDataSource,  UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {

var collectionView: UICollectionView!
private var samplePictures:[UIImage] = []
let CELL_IDENTIFIER = "photo_cell"
var currentIndex = 0
var flowLayout: UICollectionViewFlowLayout!


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    samplePictures = [UIImage(named: "Photo-1.png")!, UIImage(named: "Photo-2.png")!, UIImage(named: "Photo-3.png")!, UIImage(named: "Photo-4.png")!, UIImage(named: "Photo-5.png")!, UIImage(named: "Photo-6.png")!]

    flowLayout = UICollectionViewFlowLayout()
    flowLayout.scrollDirection = UICollectionViewScrollDirection.Horizontal
    flowLayout.minimumInteritemSpacing = 0.0
    flowLayout.minimumLineSpacing = 0.0
    flowLayout.sectionInset = UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0)

    collectionView = UICollectionView(frame: self.view.bounds, collectionViewLayout: flowLayout)
    collectionView.delegate = self
    collectionView.dataSource = self
    collectionView.showsHorizontalScrollIndicator = false
    collectionView.showsVerticalScrollIndicator = false
    collectionView.autoresizingMask = UIViewAutoresizing.FlexibleHeight | UIViewAutoresizing.FlexibleWidth
    collectionView.pagingEnabled = true
    collectionView.registerClass(SampleCollectionCell.self, forCellWithReuseIdentifier: CELL_IDENTIFIER)

    self.view.addSubview(collectionView)
}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    collectionView.reloadData()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
        return 1
}

func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return samplePictures.count
}

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

    var cell = collectionView.dequeueReusableCellWithReuseIdentifier(
    CELL_IDENTIFIER, forIndexPath: indexPath) as SampleCollectionCell

    cell.backgroundColor = UIColor.brownColor()
    cell.imageView_sample.image = samplePictures[indexPath.item]

    return cell
}

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
    return self.view.bounds.size
}


override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
    collectionView.collectionViewLayout.invalidateLayout()
}

//supports all orientations
override func supportedInterfaceOrientations() -> Int {
    return Int(UIInterfaceOrientationMask.All.rawValue)
}

//view will rotate when the interface orientation happens
override func shouldAutorotate() -> Bool {
    return true
}
}

This is the source code for the CustomCollectionCell that I'm using

class SampleCollectionCell: UICollectionViewCell {
var imageView_sample: UIImageView!

override init(frame: CGRect) {
    super.init(frame: frame)

    imageView_sample = UIImageView(frame: self.bounds)
    imageView_sample.contentMode = UIViewContentMode.ScaleAspectFit
    self.contentView.addSubview(imageView_sample)

}

required init(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

override func layoutSubviews() {
    super.layoutSubviews()
    self.imageView_surveillance.frame = self.bounds
}
}

Any help is truly appreciated. The core idea behind using this is to mimic the Photo app and also update view components when i scroll a picture. Please suggest if you think this can be done in a better way.

Regards.

how to know which text field is editing and can is get it coordinates in iOS?

I am trying to show a tableview just below the text field. I am having 5 text field in this page. I want to show the same table on all the 5 text fields (created the table programatically) please can any one help me

Unable to add a source with url

[!] Unable to add a source with url git@github.com:CocoaPods/Specs.git named master-1. You can try adding it manually in ~/.cocoapods/repos or via pod repo add. please any help

Custom View with dynamic Height as UITableView Header ios xcode

In my project,i have a 1.MovieplayerView,2.a label with dynamic content,3.a tableView with variable number of rows.

I was doing this with all these views in scrollView.But i always have the issue with dynamic height of the label.it sometime overlaps the tableView.

I came to know that we can use customView as the tableView header.How this can be done with variable content Height and autolayout?I am new to iOS.Any suggestion ??

I know how to add a view as the header to a table.But when the contents in the view changes,it overlaps the contents of the tableView.

I went through How to resize superview to fit all subviews with autolayout?,How do I set the height of tableHeaderView (UITableView) with autolayout?

Can some one give a simple example on how to do this?Or tell me if it is better to use a scrollview and add all these views as its subviews? any suggestion would be realy helpful.Thanks.