Make back button go to the previous view programmatically

Question

I have a UIBarButtonItem and would like to programmatically set the action that goes to the previous controller (in my case, my previous view is a UITableViewController).

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Answer 1

Add following code in your controller, in - (void)viewDidLoad function:

call [self addBackButtonWithTitle:@"back"]; if You want to custom backbutton with title.

or [self addBackButtonWithImageName:@"back_button_image_name"]; if You want custom backbutton with image.

/**
 *  @brief set lef bar button with custom title
 */
- (void)addBackButtonWithTitle:(NSString *)title {
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:title style:UIBarButtonItemStylePlain target:self action:@selector(backButtonPressed:)];
    self.navigationItem.leftBarButtonItem = backButton;
}

/**
 *  @brief set left bar button with custom image (or custom view)
 */
- (void)addBackButtonWithImageName:(NSString *)imageName {
    // init your custom button, or your custom view
    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
    backButton.frame = CGRectMake(0, 0, 40, 22); // custom frame
    [backButton setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];
    [backButton addTarget:self action:@selector(backButtonPressed:) forControlEvents:UIControlEventTouchUpInside];

    // set left barButtonItem with custom view
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
}

- (void)backButtonPressed:(id)sender {
    [self.navigationController popViewControllerAnimated:YES];
}