add customView sizingController & use in presentSwiftView:

ExampleProject/JDStatusBarNotificationExample.xcodeproj/project.pbxproj

@@ -17,6 +17,7 @@
 		7E1C2838285226F5004315CC /* EnumPickerOptionView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7E1C2836285226F5004315CC /* EnumPickerOptionView.swift */; };
 		7E1C2839285226F5004315CC /* EnumPickerOptionView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7E1C2836285226F5004315CC /* EnumPickerOptionView.swift */; };
 		7E2A4E852AE70A4B001F0DB0 /* JDStatusBarNotificationPresenter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7EB914CF2ADC11F4004B3435 /* JDStatusBarNotificationPresenter.swift */; };
+		7E2A4E8D2AE99D70001F0DB0 /* JDStatusBarNotificationPresenterCustomViewSizingController.h in Headers */ = {isa = PBXBuildFile; fileRef = 7E2A4E8C2AE99D70001F0DB0 /* JDStatusBarNotificationPresenterCustomViewSizingController.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		7E2F3BBB284F6144002B2181 /* ObservableCustomStyle.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7E2F3BBA284F6144002B2181 /* ObservableCustomStyle.swift */; };
 		7E2F3BBC284F6144002B2181 /* ObservableCustomStyle.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7E2F3BBA284F6144002B2181 /* ObservableCustomStyle.swift */; };
 		7E2F3BBD284F6144002B2181 /* ObservableCustomStyle.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7E2F3BBA284F6144002B2181 /* ObservableCustomStyle.swift */; };
@@ -110,6 +111,7 @@
 		7E1C283128520F56004315CC /* JDSBNotificationAnimator.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = JDSBNotificationAnimator.h; sourceTree = "<group>"; };
 		7E1C283228520F56004315CC /* JDSBNotificationAnimator.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = JDSBNotificationAnimator.m; sourceTree = "<group>"; };
 		7E1C2836285226F5004315CC /* EnumPickerOptionView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EnumPickerOptionView.swift; sourceTree = "<group>"; };
+		7E2A4E8C2AE99D70001F0DB0 /* JDStatusBarNotificationPresenterCustomViewSizingController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = JDStatusBarNotificationPresenterCustomViewSizingController.h; sourceTree = "<group>"; };
 		7E2F3BBA284F6144002B2181 /* ObservableCustomStyle.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ObservableCustomStyle.swift; sourceTree = "<group>"; };
 		7E5402C2286708840079C579 /* JDStatusBarNotification.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = JDStatusBarNotification.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		7E5402C5286708850079C579 /* JDStatusBarNotification.docc */ = {isa = PBXFileReference; lastKnownFileType = folder.documentationcatalog; path = JDStatusBarNotification.docc; sourceTree = "<group>"; };
@@ -234,6 +236,7 @@
 				7E8C519628585BE400C7C003 /* JDStatusBarNotificationPresenterPrepareStyleBlock.h */,
 				7E8C519328585BE400C7C003 /* JDStatusBarNotificationStyle.h */,
 				7E8C519728585BE400C7C003 /* JDStatusBarNotificationStyle.m */,
+				7E2A4E8C2AE99D70001F0DB0 /* JDStatusBarNotificationPresenterCustomViewSizingController.h */,
 			);
 			path = Public;
 			sourceTree = "<group>";
@@ -337,6 +340,7 @@
 				7E5402E5286709560079C579 /* JDStatusBarNotificationPresenter.h in Headers */,
 				7E5402E72867095C0079C579 /* JDStatusBarNotificationPresenterPrepareStyleBlock.h in Headers */,
 				7E5402E6286709590079C579 /* JDStatusBarNotificationStyle.h in Headers */,
+				7E2A4E8D2AE99D70001F0DB0 /* JDStatusBarNotificationPresenterCustomViewSizingController.h in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

ExampleProject/JDStatusBarNotificationExample/ExamplesScreen.swift

@@ -239,6 +239,7 @@ struct ExamplesScreen: View {
             }
             .padding(6.0)
             .padding([.leading, .trailing], 10.0)
+            .fixedSize()
           }
 
           NotificationPresenter.shared().dismiss(afterDelay: 2.5)

JDStatusBarNotification/Private/JDSBNotificationView.h

@@ -7,6 +7,8 @@
 
 #import <UIKit/UIKit.h>
 
+#import <JDStatusBarNotification/JDStatusBarNotificationPresenterCustomViewSizingController.h>
+
 NS_ASSUME_NONNULL_BEGIN
 
 @class JDStatusBarNotificationStyle;
@@ -35,6 +37,7 @@ NS_SWIFT_NAME(_SBNotificationView)
 /// state like rotation, status bar visibility, etc..) It never overlaps the statusbar. The height & width is defined
 /// by the selected style. In the pill style the view will match the pill size.
 @property (nonatomic, strong, nullable) UIView *customSubview;
+@property (nonatomic, strong, nullable) id<JDStatusBarNotificationPresenterCustomViewSizingController> customSubviewSizingController;
 
 /// A left view will be displayed left of the text. The layout can be adjusted using the leftViewStyle.
 @property (nonatomic, strong, nullable) UIView *leftView;

JDStatusBarNotification/Private/JDSBNotificationView.m

@@ -93,6 +93,7 @@ - (void)resetSubviews {
 
   // reset custom subview
   _customSubview = nil;
+  _customSubviewSizingController = nil;
   if (_leftView != _activityIndicatorView) {
     _leftView = nil;
   }
@@ -278,6 +279,11 @@ - (void)setCustomSubview:(UIView *)customSubview {
   [self setNeedsLayout];
 }
 
+- (void)setCustomSubviewSizingController:(id<JDStatusBarNotificationPresenterCustomViewSizingController>)customSubviewSizingController {
+  _customSubviewSizingController = customSubviewSizingController;
+  [self setNeedsLayout];
+}
+
 #pragma mark - Style
 
 - (void)setStyle:(JDStatusBarNotificationStyle *)style {
@@ -386,6 +392,12 @@ - (CGRect)pillContentRectForContentRect:(CGRect)contentRect {
 
   // layout pill
   CGFloat maxTextWidth = MAX(realTextSizeForLabel(_titleLabel).width, realTextSizeForLabel(_subtitleLabel).width);
+  if (_customSubview) {
+    const CGSize sizeThatFits = (_customSubviewSizingController
+                                 ? [_customSubviewSizingController sizeThatFits:contentRect.size]
+                                 : [_customSubview sizeThatFits:contentRect.size]);
+    maxTextWidth = MAX(maxTextWidth, sizeThatFits.width);
+  }
   CGFloat pillWidth = round(MAX(minimumPillWidth, MIN(maximumPillWidth, maxTextWidth + paddingX * 2)));
   CGFloat pillX = round(MAX(minimumPillInset, (CGRectGetWidth(self.bounds) - pillWidth)/2.0));
   CGFloat pillY = round(contentRect.origin.y + contentRect.size.height - pillHeight);

JDStatusBarNotification/Public/JDStatusBarNotificationPresenter.h

@@ -11,6 +11,7 @@
 
 #import <JDStatusBarNotification/JDStatusBarNotificationPresenterPrepareStyleBlock.h>
 #import <JDStatusBarNotification/JDStatusBarNotificationStyle.h>
+#import <JDStatusBarNotification/JDStatusBarNotificationPresenterCustomViewSizingController.h>
 
 @class JDStatusBarNotificationPresenter;
 
@@ -242,6 +243,27 @@ NS_SWIFT_NAME(NotificationPresenter)
                         styleName:(NSString * _Nullable)styleName
                        completion:(JDStatusBarNotificationPresenterCompletionBlock)completion NS_SWIFT_NAME(present(customView:style:completion:));
 
+/// Present a notification using a custom subview.
+///
+/// The `customView` will be layouted correctly according to the selected style & the current device
+/// state (rotation, status bar visibility, etc.). The background will still be styled & layouted
+/// according to the provided style. If your custom view requires custom touch handling,
+/// make sure to set `style.canTapToHold` to `false`. Otherwise the `customView` won't
+/// receive any touches, as the internal `gestureRecognizer` would receive them.
+///
+/// - Parameters:
+///   - customView: A custom UIView to display as notification content.
+///   - styleName: The name of the style. You can use styles previously added using e.g. ``addStyleNamed:prepare:``.
+///                If no style can be found for the given `styleName` or it is `nil`, the default style will be used.
+///   - completion: A ``JDStatusBarNotificationPresenterCompletionBlock``, which gets called once the presentation animation finishes.
+///
+/// - Returns: The presented UIView for further customization
+///
+- (UIView *)presentWithCustomView:(UIView *)customView
+                 sizingController:(id<JDStatusBarNotificationPresenterCustomViewSizingController> _Nullable)sizingController
+                        styleName:(NSString * _Nullable)styleName
+                       completion:(JDStatusBarNotificationPresenterCompletionBlock)completion NS_SWIFT_NAME(present(customView:sizingController:style:completion:));
+
 #pragma mark - Dismissal
 
 /// Dismisses any currently displayed notification immediately using an animation.

JDStatusBarNotification/Public/JDStatusBarNotificationPresenter.m

@@ -178,9 +178,20 @@ - (UIView *)presentWithTitle:(NSString *)title
 - (UIView *)presentWithCustomView:(UIView *)customView
                         styleName:(NSString * _Nullable)styleName
                        completion:(JDStatusBarNotificationPresenterCompletionBlock)completion {
+  return [self presentWithCustomView:customView
+                    sizingController:nil
+                           styleName:styleName
+                          completion:completion];
+}
+
+- (UIView *)presentWithCustomView:(UIView *)customView
+                 sizingController:(id<JDStatusBarNotificationPresenterCustomViewSizingController> _Nullable)sizingController
+                        styleName:(NSString * _Nullable)styleName
+                       completion:(JDStatusBarNotificationPresenterCompletionBlock)completion {
   JDStatusBarNotificationStyle *style = [_styleCache styleForName:styleName];
   JDSBNotificationView *view = [self presentWithTitle:nil subtitle:nil style:style completion:completion];
   view.customSubview = customView;
+  view.customSubviewSizingController = sizingController;
   return view;
 }
 

JDStatusBarNotification/Public/JDStatusBarNotificationPresenter.swift

@@ -7,14 +7,29 @@
 
 import SwiftUI
 
+class NotificationPresenterSizingController<Content>: NotificationPresenterCustomViewSizingController where Content: View {
+  let hostingController: UIHostingController<Content>
+
+  init(hostingController: UIHostingController<Content>) {
+    self.hostingController = hostingController
+  }
+
+  func sizeThatFits(in size: CGSize) -> CGSize {
+    return hostingController.sizeThatFits(in: size)
+  }
+}
+
 extension NotificationPresenter {
 
   public func presentSwiftView(style: String? = nil,
                         @ViewBuilder viewBuilder: () -> some View,
                         completion: NotificationPresenterCompletion? = nil) {
     let controller = UIHostingController(rootView: viewBuilder())
     controller.view.backgroundColor = .clear
-    self.present(customView: controller.view, style: style, completion: completion)
+    self.present(customView: controller.view,
+                 sizingController: NotificationPresenterSizingController(hostingController: controller),
+                 style: style,
+                 completion: completion)
   }
 
 }

JDStatusBarNotification/Public/JDStatusBarNotificationPresenterCustomViewSizingController.h

@@ -0,0 +1,17 @@
+//
+//  JDStatusBarNotificationPresenterCustomViewSizingController.h
+//
+//  Created by Markus Emrich on 10/25/23.
+//  Copyright 2023 Markus Emrich. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+NS_SWIFT_NAME(NotificationPresenterCustomViewSizingController)
+@protocol JDStatusBarNotificationPresenterCustomViewSizingController
+- (CGSize)sizeThatFits:(CGSize)size NS_SWIFT_NAME(sizeThatFits(in:));
+@end
+
+NS_ASSUME_NONNULL_END