Method 'fontWithName(_:size:)' conflict with Objective-C selector

Question

I am trying to create an extension for UIFont. But that show error describe below

Method 'fontWithName(_:size:)' with Objective-C selector 'fontWithName:size:' conflicts with previous declaration with the same Objective-C selector

Extension class code:

import UIKit
import Foundation

extension UIFont {

    class func fontWithName(fontName: String, size fontSize: CGFloat) -> UIFont {
        return UIFont(name: fontName, size: fontSize + 5)!
    }
}

See Image

So basically you just want to make all the app fonts 5pt bigger. — Crazyrems, Mar 11 '16 at 10:08

UIResponder · Answer 1 · 2016-03-11T07:55:06.793

1

This method name is not agreed because, there is already an init method present in UIFont class.

// Returns a font using CSS name matching semantics.
    public /*not inherited*/ init?(name fontName: String, size fontSize: CGFloat)

Now, Swift parses your method and finds it similar to default init method in UIFont.

// Returns a font using CSS name matching semantics.
+ (nullable UIFont *)fontWithName:(NSString *)fontName size:(CGFloat)fontSize;

Try changing your method name without losing its purpose (name telling purpose.) You'll get your method working.

Example:

func fontName(fontName: String, size fontSize: CGFloat) -> UIFont {
    return UIFont(name: fontName, size: fontSize + 5)!
}

edited Mar 11 '16 at 07:55

answered Mar 11 '16 at 07:08

UIResponder

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then i need to use this custom method for set font right? – Tejas Ardeshna Mar 11 '16 at 07:33
Yes, you'll use this method. – UIResponder Mar 11 '16 at 07:39
how to call this method? – Tejas Ardeshna Mar 11 '16 at 08:18
And does this method effect font which are set from storyboard? – Tejas Ardeshna Mar 11 '16 at 08:21
No. It will not reflect changes in Storyboard. It works only when you explicitly set the font property. Ex: label.font = yourMethodReturnedFont – UIResponder Mar 11 '16 at 09:23
ok thanks for answer but i need class which affect the storyboard changes as well. +1 for ans – Tejas Ardeshna Mar 11 '16 at 10:36

score 0 · Answer 2 · edited May 23 '17 at 11:58

0

Objective C does not support method overloading and since NSFont is a Objective C class which already has a method with that name it results in a conflict. However if you still want to use that name for the method you could check out this solution: https://stackoverflow.com/a/31500740/1949494 .Otherwise just rename the method.

edited May 23 '17 at 11:58

Community

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answered Mar 11 '16 at 07:10

Jelly

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Method 'fontWithName(_:size:)' conflict with Objective-C selector

2 Answers2