How to Fix "'@Ibinspectable' Attribute Is Meaningless on a Property That Cannot Be Represented in Objective-C" Warning

How to fix '@IBInspectable' attribute is meaningless on a property that cannot be represented in Objective-C warning

Maybe.

The exact error (not warning) I got when doing a copy/paste of class CircularIndicator: UIView is:

Property cannot be marked @IBInspectable because its type cannot be
represented in Objective-C

I resolved it by making this change:

@IBInspectable var backgroundIndicatorLineWidth: CGFloat? {  // <-- warning here
    didSet {
        backgroundIndicator.lineWidth = backgroundIndicatorLineWidth!
    }
}

To:

@IBInspectable var backgroundIndicatorLineWidth: CGFloat = 0.0 {
    didSet {
        backgroundIndicator.lineWidth = backgroundIndicatorLineWidth
    }
}

Of course, backgroundIndicator is undefined in my project.

But if you are coding against didSet, it looks like you just need to define a default value instead of making backgroundIndicatorLineWidth optional.

Segue from Obj-c to swift can't find property

If you are using Swift file in objc classes Bridging header won't help here.

Xcode will create Header file which you need to import

First goto build settings and search for Defines Modules and set it to true.

Now in .m file add following header file

#import "YourTargetName-Swift.h" 

and build the project

and also add @objc before your property

Hope it is helpful

Adding space/padding to a UILabel

If you want to stick with UILabel, without subclassing it, Mundi has given you a clear solution.

If alternatively, you would be willing to avoid wrapping the UILabel with a UIView, you could use UITextView to enable the use of UIEdgeInsets (padding) or subclass UILabel to support UIEdgeInsets.

Using a UITextView would only need to provide the insets (Objective-C):

textView.textContainerInset = UIEdgeInsetsMake(10, 0, 10, 0);

Alternative, if you subclass UILabel, an example to this approach would be overriding the drawTextInRect method

(Objective-C)

- (void)drawTextInRect:(CGRect)uiLabelRect {
    UIEdgeInsets myLabelInsets = {10, 0, 10, 0};
    [super drawTextInRect:UIEdgeInsetsInsetRect(uiLabelRect, myLabelInsets)];
}

You could additionally provide your new subclassed UILabel with insets variables for TOP, LEFT, BOTTOM and RIGHT.

An example code could be:

In .h (Objective-C)

float topInset, leftInset,bottomInset, rightInset;

In .m (Objective-C)

- (void)drawTextInRect:(CGRect)uiLabelRect {
    [super drawTextInRect:UIEdgeInsetsInsetRect(uiLabelRect, UIEdgeInsetsMake(topInset,leftInset,bottomInset,rightInset))];
}

From what I have seen, it seems you have to override the intrinsicContentSize of the UILabel when subclassing it.

So you should override intrinsicContentSize like:

- (CGSize) intrinsicContentSize {
    CGSize intrinsicSuperViewContentSize = [super intrinsicContentSize] ;
    intrinsicSuperViewContentSize.height += topInset + bottomInset ;
    intrinsicSuperViewContentSize.width += leftInset + rightInset ;
    return intrinsicSuperViewContentSize ;
}

And add the following method to edit your insets, instead of editing them individually:

- (void) setContentEdgeInsets:(UIEdgeInsets)edgeInsets {
    topInset = edgeInsets.top;
    leftInset = edgeInsets.left;
    rightInset = edgeInsets.right;
    bottomInset = edgeInsets.bottom;
    [self invalidateIntrinsicContentSize] ;
}

It will update the size of your UILabel to match the edge insets and cover the multiline necessity you referred to.

After searching a bit I have found this Gist with an IPInsetLabel. If none of those solutions work you could try it out.

There was a similar question (duplicate) about this matter.

For a full list of available solutions, see this answer: UILabel text margin

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