iOS: Loading second view controller without nib file

Question

I have a project, which consists of the standard AppDelegate and ViewController files, but does not utilize nib files.

Here's the code:

delegate header

// AppDelegate.h
#import <UIKit/UIKit.h>
@class ViewController;
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) ViewController *vc1;
@end

delegate implementation

// AppDelegate.m
#import "AppDelegate.h"
#import "ViewController.h"

@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.vc1 = [[ViewController alloc] init];
    self.window.rootViewController = self.vc1;
    [self.window makeKeyAndVisible];
    return YES;
}
@end

view controller header

//  ViewController.h
#import <UIKit/UIKit.h>

@interface view1 : UIViewController{
    UIButton *button;
}
@end

view controller implementation

//  ViewController.m
#import "ViewController.h"

@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    CGRect buttonFrame = CGRectMake(30, 30, 100, 30);
    button = [[UIButton alloc] initWithFrame: buttonFrame];
    [button setTitle: @"Switch View" forState: UIControlStateNormal];
    [self.view addSubview: button];

    [button addTarget: self action: @selector(buttonClicked:) forControlEvents: UIControlEventTouchDown];
}

- (void) buttonClicked: (id)sender {
    SecondViewController *vc2 = [[SecondViewController alloc] init];
        //both methods throw the same error - no known class method for selector
    //[self presentViewController:vc2 animated:YES completion:nil];         
    [self presentModalViewController:vc2 animated:YES completion:nil];
}

@end

When trying to load another nib-less view controller (in the buttonClicked method above), it keeps throwing the error

No known class method for selector 'presentViewController'

What am I doing wrong?

Azat · Accepted Answer · 2015-05-17 11:08:39Z

2

The right method is the following:

[self presentViewController:vc2 animated: YES completion:nil];

answered May 17, 2015 at 11:08

Azat

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3 Comments

iSofia Over a year ago

It works! Thank you very much. This works since it's in a method - would it be possible to run this in a normal function instead?

Azat Over a year ago

what do you mean by normal function?

iSofia Over a year ago

I just tried it and it works too. Thank you. I meant using a function instead of an Objective-C method: (void) buttonClicked {...} and not (void) buttonClicked: (id)sender {...}

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