Multi-OS-Engine Underline on NSAttributedString

JavaPart.java

protected static void makeTitleUnderlined(UIButton button, String title) {
  final NSMutableAttributedString underlinedTitle = NSMutableAttributedString.alloc().initWithString(title);
  NSMutableAttributedStringFix.makeUnderlined(underlinedTitle, NSMakeRange(0, underlinedTitle.length()));
  button.setAttributedTitleForState(underlinedTitle, UIControlState.Normal);
}

/**
 * Binding to the ObjC part of the workaround
 */
@Runtime(ObjCRuntime.class)
@ObjCCategory(NSMutableAttributedString.class)
private static class NSMutableAttributedStringFix extends NSMutableAttributedString {

    static {
        NatJ.register();
    }

    protected NSMutableAttributedStringFix(Pointer peer) {
        super(peer);
    }

    @Selector("makeUnderlined:")
    public static native void makeUnderlined(NSMutableAttributedString self, @ByValue NSRange range);
}

ObjCPart.m

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@implementation NSMutableAttributedString (NSMutableAttributedStringFix)

- (void)makeUnderlined:(NSRange)range {
    [self addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle | NSUnderlinePatternSolid) range:range];
}

@end

See https://discuss.multi-os-engine.org/t/mysterious-crash-how-to-debug-it/1149