Swift - call @IBAction method in viewDidLoad without parameter

Question

@IBAction func getNewPhotoAction(sender: AnyObject) {
    println("getNewPhotoAction")
}

override func viewDidLoad() {
    super.viewDidLoad()
    self.getNewPhotoAction(sender: AnyObject) // Error
}

I just want to call the getNewPhotoAction IBAction method in viewDidLoad.

Which parameter to enter in this line -> self.getNewPhotoAction(?????) ?

I don't have any parameter. I just need to call.

I used in Objective-C style:

[self getNewPhotoAction:nil]

but I don't know Swift style.

@himanshu-padia Do not add blockquotes for things that are not code. And if you edit, don't forget to properly capitalize nouns and to fix errors. Just editing to add the language name in blockquotes is not acceptable. Thanks. — Eric Aya, May 10 '16 at 12:59

linimin · Answer 1 · 2014-11-12T09:35:29.413

42

The parameter sender indicates who are calling the action method. When calling from viewDidLoad, just pass self to it.

override func viewDidLoad() {
    super.viewDidLoad()
    getNewPhotoAction(self)
}

By the way, if the sender parameter of the getNewPhotoAction method wasn’t used, the parameter name can be omitted.

@IBAction func getNewPhotoAction(AnyObject) {
    println("getNewPhotoAction")
}

edited Nov 12 '14 at 09:35

answered Nov 12 '14 at 03:49

linimin

6,239
2
26
31

Only do this as a last resort, IBActions are intended to be colled from the user interface code. Calling these directly is unexpected and will result in code that is difficult to follow and understand. – xpereta Jun 27 '18 at 14:45

score 5 · Answer 2 · answered Oct 13 '14 at 22:21

5

You could always create a separate func that you call on in your viewDidLoad or in your IBAction

override func viewDidLoad() {
   super.viewDidLoad()
   self.getNewPhoto()
}

func getNewPhoto(){
    //do whatever you want here. 
    println("getnewphotoaction")
    println("whatever you want")
}
@IBAction func getNewPhotoAction(sender: AnyObject) {
    self.getNewPhoto()
}

answered Oct 13 '14 at 22:21

Amerino

389
1
5

yep.. it's good solution. but i want to call method direct..anyway thanks your answer – hahaha Oct 14 '14 at 09:25
This adds a small though unnecessary amount of bulk to the code. – Pouria Almassi Nov 11 '14 at 20:50
1

@Amerino solution is better. It introduces an intermediate, understandable abstraction. But if you really want to call it directly, check my answer. – linimin Nov 12 '14 at 03:54

score 4 · Answer 3 · answered Mar 29 '19 at 09:27

4

Swift 4.2

@IBAction func getNewPhotoAction(sender: Any) {
    println("getNewPhotoAction")
}

override func viewDidLoad() {
    super.viewDidLoad()
    self.getNewPhotoAction(AnyObject.self)
}

answered Mar 29 '19 at 09:27

Jamil Shamar

41
1

score 3 · Answer 4 · answered Apr 10 '15 at 06:40

3

If you still need to reference the UIButton or whatever is sending the action and want to call it from code at the same time - you can do this too:

onNext(UIButton())

Wasteful, but less code.

answered Apr 10 '15 at 06:40

Alexandre G

1,655
20
30

score 2 · Answer 5 · edited May 10 '16 at 13:20

2

You actually don't need to pass any object at all. If you have no need to use the sender, then declare the function without it like this:

@IBAction func getNewPhotoAction() { ... }

And use it like this:

self.getNewPhotoAction()

You may need to re-connect the outlet in interface builder when you make this change (remove it and then add it back) if this method is connected to an event in interface builder.

edited May 10 '16 at 13:20

Himanshu padia

7,428
1
47
45

answered Nov 14 '14 at 22:52

jaime

927
8
13

1

99% of the ibactions have no use for the sender. This both works around the swift mangling issue that went awry in xcode 8 AND makes code more compact. thank you! – Anton Tropashko Sep 28 '16 at 10:15

score 2 · Answer 6 · answered Aug 05 '15 at 05:52

@IBAction func getNewPhotoAction(sender: AnyObject?){
    ......
}

**AnyObject** means that you have to pass kind of Object which you are using, nil is not a AnyObject.
But **AnyObject?**, that is to say AnyObject is Optional, nil is a valid value.
meaning the absence of a object.

self .getNewPhotoAction(nil)

score 1 · Answer 7 · answered Jul 24 '15 at 05:08

1

@IBAction func getNewPhotoAction(sender: AnyObject? = nil) {
    print("getNewPhotoAction")
}

override func viewDidLoad() {
    super.viewDidLoad()
    self.getNewPhotoAction(nil)
}

answered Jul 24 '15 at 05:08

米米米

970
7
9

score 0 · Answer 8 · answered Oct 13 '14 at 21:51

0

Since you don't have any sender, hand over nil.

self.getNewPhotoAction(nil)

answered Oct 13 '14 at 21:51

David

3,388
2
21
25

`getNewPhotoAction`s signature will need to be changed to `AnyObject?` if you want to pass nil. – David Berry Oct 13 '14 at 22:32
1

self.getNewPhotoAction(nil) -> I already tried but it's error – hahaha Oct 14 '14 at 09:23

Swift - call @IBAction method in viewDidLoad without parameter

8 Answers8