I try to make simple OSX application with WebView. I am new in Swift, and have some errors:
it's my WebView delegate file:
class WebViewControllerDelegate: NSObject{
#IBOutlet var webview: WebView!
override init()
{
super.init()
self.webview.frameLoadDelegate = self
let url = NSURL(string: "http://google.com")
let request = NSURLRequest(URL: url);
self.webview.mainFrame.loadRequest(request)
}
func didFinishLoadForFrame()
{
println("ok:")
}
}
I try to run this, but have EXC_BAD_INSTRUCTION error at line where I set frameLoadDelegate to self. I think it's error with web view outlet, but i can't fix it.
self.webview is nil, and i don't know why...
Views in Xib / Storyboard files are not loaded nor connected during initialization. That is why self.webview is nil in your code.
You really should not attach the IBOutlet directly to your "delegate". Instead, connect it to your view controller and have the view controller set it on the delegate. You should do that in viewDidLoad because that is when you can guarantee all of the objects have been created and connected.
I had same error before. I give you a suggestion for solve this error. Do following things...
1. Click on the View Controller open the connection inspector.
See this...
2. And then you have to double check on the connection inspector window and find something contain like following image...
3. Then you have to delete one outlet. According to my one I have to delete below one... finally solved one...
Then run the code...
Related
I tried to create a simple Complex Number Calculator using classes. My application has compiled successfully, but when I ran it, a blank window appeared instead of a window with all my buttons, labels etc. and I got this message in the output window:
2016-03-08 22:20:42.499 Complex Numbers[30404:2328250] Failed to set
(contentViewController) user defined inspected property on (NSWindow):
Cannot create BOOL from object <_NSControllerObjectProxy:
0x6000000022c0> of class _NSControllerObjectProxy
This is my ViewController class code. It involves a complexNumber class, which I didn't submit here:
class ViewController: NSViewController {
#IBOutlet var Screen: NSView!
var a = complexNumber();
#IBOutlet var realValue: NSTextField!
#IBOutlet var imaginaryValue: NSTextField!
#IBOutlet var resultLabel: NSTextField!
#IBAction func lengthResult(sender: AnyObject) {
let r = NSString(string: realValue.stringValue).doubleValue;
let i = NSString(string: imaginaryValue.stringValue).doubleValue;
a = complexNumber(real: r, imaginary: i);
resultLabel.stringValue = String(a.trigonometric());
}
#IBAction func trigonometryResult(sender: AnyObject) {
let r = NSString(string: realValue.stringValue).doubleValue;
let i = NSString(string: imaginaryValue.stringValue).doubleValue;
a = complexNumber(real: r, imaginary: i);
resultLabel.stringValue = String(a.length());
}
#IBAction func operation(sender: AnyObject) {
a = complexNumber(real: NSString(string: realValue.stringValue).doubleValue, imaginary: NSString(string: imaginaryValue.stringValue).doubleValue);
realValue.stringValue = ""
imaginaryValue.stringValue = "";
let b = complexNumber(real: NSString(string: realValue.stringValue).doubleValue, imaginary: NSString(string: imaginaryValue.stringValue).doubleValue)
switch sender.stringValue {
case "+": a = a.sum(b)
case "-": a = a.dif(b)
case "x": a = a.mul(b)
case ":": a = a.div(b)
default: a = a.sum(complexNumber())
}
}
#IBAction func displayResult(sender: AnyObject) {
resultLabel.stringValue = String("\(a.real) + i*\(a.imaginary)");
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override var representedObject: AnyObject? {
didSet {
// Update the view, if already loaded.
}
}
}
I found a similar thread here, but I don't think it's what I was looking for.
Can you help me, please?
Another reason - when you setup wrong binding.
Example of my error:
Failed to set (contentViewController) user defined inspected property on (NSWindow): [<NSProgressIndicator 0x10111b890> valueForUndefinedKey:]: this class is not key value coding-compliant for the key Enabled.
To solve this you need to delete the binding here:
For me was a timing issue I guess. All begins after I added an SFAuthorizationView some days ago, and I discovered that thanks to a bug report, where also was clear that this is happening on older OSes like Sierra, but it is fine, instead, in 10.13+.
Moving some code from viewDidLoad() to viewDidAppear() the problem gone.
Basically I'm just waiting to call any related method of the problematic view later the viewcontroller content view is declared as loaded. Clearly a an Apple problem fixed in new OSes. So after instantiate the nib/xib/storyboard involved I think anyone encounter problems like that should firstly show the view and then customise it. Just my testimony.
I had this problem and figured it out.
In my view I had a user defined property (if you look at the top of your view where you have view controller and first responder you should see it's icon next to it).
Simply delete it and run your application.
Hope this helps!
I you've created an app with a"storyboard" i.e. if there's a storyboard file with your views and windows in it, then there's one of two things missing:
1) If theres a main window and a view that should be it's main view, then right click - drag from the window controller to the view that should be the main view.. When the popup happens, click on "content view" i.e. like follows:
Check out my video example
If this fails, then I'll dig out plan two :)
How this helps!!
Ade.
One thing that may help others, I saw the same message, it looked like the contentViewController was the problem, but it turned out it was another component in something I was writing was failing. It seems the window manager catches all exceptions, not just window exceptions, and prints this deceptive message. What worked for me is stepping through to find component is not loading.
This happens when there is an error or exception in ViewDidLoad.
Ensure that error is cleared and your UI will load fine and u wont get this message.
I am trying to add an outlet into my viewcontroller for a toolbar item in my window controller. I have tried playing around with first responder and bindings but have not been able to find any solutions.
A similar question that was answered provided some insight but no one has mentioned anything about IBOutlets other than still asking how to add them in the comments. The answer has been accepted so i am assuming no one will add to it.
How to use NSToolBar in Xcode 6 and Storyboard?
Incase my question is unclear at all, i would like to be able to add this to my storyboard program
#IBOutlet weak var Mytoolbar: NSToolbarItem!
func enabletoolbar()
{
Mytoolbar.action = "FunctionIn.ViewController.swift"
Mytoolbar.enabled = true
}
I found a decent workaround by adding IBOutlets to my custom NSWindow class and using the storyboard to connect my views to the IBOutlets. Then, I accessed these views from my NSViewController class by getting them from the custom NSWindow.
Basically you need to set the action and other properties to the toolbaritem but not in the toolbar. So try the same.
i ended up doing this in my view controller which seems to work
override func viewDidLayout() {
var x = self.view.window?.toolbar?.items[1].label
println(x)
if(self.view.window?.toolbar?.items[0].label! != "Check")
{
toobarediting()
}
println("didlay")
}
func toobarediting() {
self.view.window?.toolbar?.insertItemWithItemIdentifier("Check", atIndex: 0)
}
func toolbarcheck(functiontoset: Selector) {
var y = self.view.window?.toolbar?.items[0] as NSToolbarItem
y.action = functiontoset
if(functiontoset != nil)
{
y.enabled = true
}
}
It seems to allow me to make the tool bar button clickable/unclickable when ever i require it to change it just seems so much more bulky and error prone than
myitem.enable = fale
myitem.action = nil
is this really the best way for a storyboard based application in osx?
While connectiong IBActions works by using either the First Responder or by adding an "Object" to the scene, then changing its class to the window's view controller class, this doesn't help with IBOutlets and delegates that you'd like to point to the view controller.
Here's a work-around for that:
Add the Toolbar to the View Controller, not to its Window. That way, you can make all the IBOutlet connections in the View Controller Scene easily. I've done that for years and found no issues with it, even when using Tabs.
You'll have to assign the window's toolbar in code, then. E.g. like this:
#interface ViewController ()
#property (weak) IBOutlet NSToolbar *toolbar; // connect this in your storyboard to the Toolbar that you moved to the View Controller Scene
#end
- (void)viewWillAppear {
[super viewWillAppear];
self.view.window.toolbar = self.toolbar;
}
I'm trying to add a new sub view form a nib using swift for OS X.
So far i've:
created a new "Cocoa Application"
added a new "Cocoa Class" called "TestSubView" as a subclass of NSViewController with a XIB file
I want to add this subview to my main view when the application loads.
in my ViewController ( the ViewController for the main window ) i have.
import Cocoa
class ViewController: NSViewController {
override func viewDidLoad() {
super.viewDidLoad()
let newSubView = TestSubView();
self.view.addSubview(newSubView.view);
}
override var representedObject: AnyObject? {
didSet {
// Update the view, if already loaded.
}
}
}
But i'm getting the following error
Failed to set (contentViewController) user defined inspected property on (NSWindow):
-[NSNib initWithNibNamed:bundle:] could not load the nibName: temp.TestSubView in bundle (null).
I realise i will need to size and position this subview but I can't seem to get to that point.
I've spent the better part of a day trying to figure this one out so any help would be greatly appreciated.
I finally got this thing to work. My new code looks like
import Cocoa
class ViewController: NSViewController {
override func viewDidLoad() {
super.viewDidLoad()
let subview = TestSubView(nibName: "TestSubView", bundle: nil)!
self.view.addSubview(subview.view)
}
override var representedObject: AnyObject? {
didSet {
// Update the view, if already loaded.
}
}
}
Found with the help of the docs & this answer
It was suggested that if the nib name and the class name are the same you shouldn't need to declare nibname: (as i'd tried to do originally) but the docs didn't mention this - explains why it didn't work!
For prosperity, this worked for me with Xcode 6.1.1 on OS X Yosemite (10.10.1)
A nib is really nothing but an XML file with view information in it. You have to get it from the application bundle and get one of the views contained in it explicitly. You are perhaps confounding views and view controllers (your attempt to extract view from newSubView suggests that).
Try this:
let subview = NSBundle.mainBundle().loadNibNamed("TestSubView",
owner:self, options:nil)![0]! // maybe no final unwrapping "!" in Swift 3
self.view.addSubview(subview)
Make sure the xib is really called the name you are using and contains at a least one view (otherwise the two unwrapping ! above will crash your app).
(Swift, iOS8, Xcode6, iPhone/iPad)
webViewDidFinishLoad is not being called, is not firing, and is not working.
Yes, I have set the containing view controller as the delegate. I CTRL-mousedowned on the UIWebView, dragged up to the little yellow circle representing the view controller, and released. A right-click on the UIWebView object shows that the delegate is set.
Yes, I did implement UIWebViewDelegate in my class declaration, like so:
class Paragraph: UIViewController, UIWebViewDelegate {
Yes, I did restart Xcode, and test on both the simulator and an actual iPhone 4S.
The request looks like this:
#IBOutlet var paragraph : UIWebView = nil
var r = NSBundle.mainBundle().pathForResource("cheddar", ofType: "htm")
var u = NSURL(fileURLWithPath: r)
paragraph.loadRequest(NSURLRequest(URL: u))
The callback function looks like this:
func webViewDidFinishLoad() {
println("webViewDidFinishLoad")
}
I got it. The callback was missing a parameter. For posterity:
func webViewDidFinishLoad(webView: UIWebView!) {
Note the webView: UIWebView! parameter
In this case, perhaps even more important, is the way I found the bug. I created an entirely new view controller, and pieced it back together, carefully checking at each step to make sure that I didn't miss anything.
When the Intellisense popup showed the function with the parameter, I saw my error.
NOTE: In Swift 2.2, the UIWebViewDelegate protocol specifies a different optionality:
webView: UIWebView.
webView: UIWebView! spawns a warning.
I am new to IOS developing and recently started in Xcode 4.5. I saw for every viewController that i could set some identity variables including the storyboard ID. What is this, and how can I use it?
I started searching on stackoverflow and couldn't find any explanation for it.
I assumed it's not just some stupid label that I can set to remember my controller right? What does it do?
The storyboard ID is a String field that you can use to create a new ViewController based on that storyboard ViewController. An example use would be from any ViewController:
//Maybe make a button that when clicked calls this method
- (IBAction)buttonPressed:(id)sender
{
MyCustomViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:#"MyViewController"];
[self presentViewController:vc animated:YES completion:nil];
}
This will create a MyCustomViewController based on the storyboard ViewController you named "MyViewController" and present it above your current View Controller
And if you are in your app delegate you could use
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard"
bundle: nil];
Edit: Swift
#IBAction func buttonPressed(sender: AnyObject) {
let vc = storyboard?.instantiateViewControllerWithIdentifier("MyViewController") as MyCustomViewController
presentViewController(vc, animated: true, completion: nil)
}
Edit for Swift >= 3:
#IBAction func buttonPressed(sender: Any) {
let vc = storyboard?.instantiateViewController(withIdentifier: "MyViewController") as! ViewController
present(vc, animated: true, completion: nil)
}
and
let storyboard = UIStoryboard(name: "MainStoryboard", bundle: nil)
To add to Eric's answer and update it for Xcode 8 and Swift 3:
A storyboard ID does exactly what the name implies: it identifies. Just that it identifies a view controller in a storyboard file. It is how the storyboard knows which view controller is which.
Now, don't be confused by the name. A storyboard ID doesn't identify a 'storyboard'. A storyboard, according to Apple's documentation, 'represents the view controllers for all or part of your app’s user interface.' So, when you have something like the picture below, you have a storyboard called Main.storyboard which has two view controllers, each of which could be given a storyboard ID (their ID in the storyboard).
You can use a view controller's storyboard ID to instantiate and return that view controller. You can then go ahead to manipulate and present it however you want. To use Eric's example, say you want to present a view controller with identifier 'MyViewController' when a button is pressed, you would do it this way:
#IBAction func buttonPressed(sender: Any) {
// Here is where we create an instance of our view controller. instantiateViewController(withIdentifier:) will create an instance of the view controller every time it is called. That means you could create another instance when another button is pressed, for example.
let vc = storyboard?.instantiateViewController(withIdentifier: "MyViewController") as! ViewController
present(vc, animated: true, completion: nil)
}
Please take note of changes in syntax.