Xcode错误消息-ViewController没有可见的@interface声明选择器

Question

I have a very simple method that allows me to specify the name of a UIButton and then set its title. I previously had the method in my main ViewController which worked fine. But then I have decided to create a new file called CustomMethods.h/m and put all of my methods in there.

As soon as I have moved the method across and #import the header into the main view controller I am getting the error message below

No visible @interface for ViewController declares the selector 'SetTitleOfButtonNamed:withTitle:'

In my CustomMethods file I have created my method as follows:

-(void)setTitleOfButtonNamed:(UIButton *)button withTitle:(NSString *)buttonTitle
{
    [button setTitle:buttonTitle forState:(UIControlStateNormal)];
}

In the viewDidLoad of the main ViewController I am trying to call this method and set the button title as follows:

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSString *btnOneTitle = @"Button 1";
    [self setTitleOfButtonNamed:buttonOne withTitle:btnOneTitle]; // ERROR OCCURS HERE
}

Before I copied the method into its own file it worked perfectly. Any ideas?

Answer 1

You are still calling setTitleOfButtonNamed on "self" which is the ViewController. You need to call it from the CustomMethods class that implements the method now.

[self setTitleOfButtonNamed:buttonOne withTitle:btnOneTitle];