How to add a method to UITextField & UITextView?

Question

I want to put something like this in a method for UITextField & UITextView.

- (void)changeKeyboardType:(UIKeyboardType)keyboardType         


        

Answer 1

Like @Josh said, method swizzling isn't what you are looking for. However what I actually had in mind (My bad for not researching more into it before submitting an answer) is to add method at runtime on UITextView and UITextField. While this needs a bit more code to implement, it can give you the sort of one-shot you are looking for (You create a method and add it to both UITextView & UITextField at run-time)

Here's a blog post about it:

http://theocacao.com/document.page/327

http://www.mikeash.com/pyblog/friday-qa-2010-11-6-creating-classes-at-runtime-in-objective-c.html

Answer 2

What about something like this?

// UIView+UITextInputTraits.h

@interface UIView (UITextInputTraits)
- (void)changeKeyboardType:(UIKeyboardType)keyboardType;    
@end


// UIView+Additions.m

#import "UIView+UITextInputTraits.h"

@implementation UIView (UITextInputTraits)

- (void)changeKeyboardType:(UIKeyboardType)keyboardType {
    if ([self conformsToProtocol:@protocol(UITextInputTraits)]) {
        id<UITextInputTraits> textInput = (id<UITextInputTraits>)self;
        if (textInput.keyboardType != keyboardType) {
            [self resignFirstResponder];
            textInput.keyboardType = keyboardType;
            [self becomeFirstResponder];
        }
    }
}

@end

Answer 3

For each of these, you can create a category.

Interface file:

@interface UITextField (ChangeKeyboard)
- (void)changeKeyboardType:(UIKeyboardType)keyboardType;
@end

Implementation file:

@implementation UITextField (ChangeKeyboard)
- (void)changeKeyboardType:(UIKeyboardType)keyboardType {
    self.keyboardType = keyboardType;
    [self resignFirstResponder];
    [self becomeFirstResponder];
}
@end

That would be the way to add these, but I haven't tested the functionality.