unrecognized-selector

I'm trying to call an instance of Timer and print "A second has passed" for each second that elapses. I'm following The Complete iOs 11 & Swift Developer Course on Udemy. The instructor does exactly this and his code works, yet mine is crashing. Here's the code: var timer: Timer! = Timer() @IBAction func cameraPressed(_ sender: Any) { timer.invalidate() } func processTimer() { print("A second has passed") } override func viewDidLoad() { super.viewDidLoad() timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: Selector("processTimer"), userInfo: nil, repeats: true) It should

I'm new at Xcode, and my task was to migrate the code from iOS 6.1 to 8.4 , but there where so many deprecated methods. I solved them (I hope so), but now I got a new problem. The code I'm using is this one: [self.clientImageView sd_setImageWithURL:[NSURL URLWithString:_client.imageURL] placeholderImage:[UIImage imageNamed:@"placeholder.png"]]; And I get this error: [UIImageView sd_setImageWithURL:placeholderImage:]: unrecognized selector sent to instance 0x7fbe937a88b0 And finally, I get this: * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIImageView sd

Lots of similar questions but non with a solution that works in my case. I try to write a simple FlipSideApp. Just two views with a single button each (flipBtn | flopBtn) to present the other view vice versa. flip on the first view works fine. flop on the other view causes a unrecognized selector sent to instance 0x6c3adf0 . The App crashes after calling [self dismissViewControllerAnimated:YES completion:nil]; in file FlipSide.m (see code below). Where 0x6c3adf0 is the current address of self which is an instance of FlipSide : UIViewController in that case. So I think the unrecognized selector

I want to implement TapGestureRecognizer with the selector , below is the code where I added tapGestureRecognizer to my imageView let tapFirstGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(assignImage(_:))) firstImageView.isUserInteractionEnabled = true firstImageView.tag = 1 firstImageView.addGestureRecognizer(tapFirstGestureRecognizer) Here is the action method func assignImage(_ sender: UIImageView){ imagePicker.allowsEditing = false imagePicker.sourceType = .photoLibrary imageViewTag = sender.tag present(imagePicker, animated: true, completion: nil) } Compiler

Is it possible to set a break point on this bit of feedback in the console? This would make handling this problem so much easier. Unrecognized selector is an exception, and you can set a breakpoint on exceptions. In Xcode 4, go to the breakpoint navigator, click the +, and choose "Add Exception Breakpoint". Under Exception, choose Objective-C. Under Break, choose On Throw. It should look like this when you're done: 来源： https://stackoverflow.com/questions/7354169/breaking-on-unrecognized-selector

First of all, I tried almost all the solutions given in stackoverflow but I didn't succeed in implement global vars, I even did a step by step tutorial and still I get the same errors. heres the issue: I have a program with severals views, I'd like to use variables on all of the views, so I used global variables, I have: GlobalVars.h #import <UIKit/UIKit.h> extern NSArray *truckBoxes; extern NSArray *farmerlist; extern NSString *farmerCardNumber; extern NSString *fName; @interface GlobalVars : NSObject { } @end GlobalVars.m #import "GlobalVars.h" NSArray *farmerlist; NSArray *truckBoxes;