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Making a Transparent Embedded FlutterView Pass Touches Through on iOS

When you embed Flutter into an existing iOS app, one common pattern is to place a FlutterViewController on top of native UIKit content as an overlay. Visually, this is straightforward: make the Flutter view transparent and render only the pieces of UI you want to show.

The tricky part is touch handling.

Even when the Flutter overlay is visually transparent, it still sits on top of the native view hierarchy. That means touches inside the overlay’s frame are usually captured by the Flutter view instead of reaching the UIViews underneath. If your design expects native controls below the transparent parts of Flutter to remain tappable, visual transparency alone is not enough.

This post explains the problem, the recommended solution, and a sample implementation for both iOS and Flutter.

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 jq '[.assets[] | { image: .asset.name, annotations: [.regions[] | { label: .tags[0], coordinates: .boundingBox | { x: .left | round, y: .top | round, width: .width | round, height: .height | round } }] }]' 

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import Foundation
import UIKit

public protocol MenuItem {}

public protocol MenuDelegate: AnyObject {
    associatedtype Item: MenuItem
    func menu(_ menu: Menu<Item, Self>, didSelect item: Item)
}

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#import <Foundation/Foundation.h>

int main(int argc, char *argv[]) {
	@autoreleasepool {
		dispatch_semaphore_t lock =  dispatch_semaphore_create(0);
		
		dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_global_queue(QOS_CLASS_DEFAULT, 0), ^{
				NSLog(@"unlock");
				dispatch_semaphore_signal(lock);
			});

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application: altcanvas-repo
version: 1
runtime: python
api_version: 1

handlers:
- url: .*
  script: debrepo.py

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---
Language: Cpp
BasedOnStyle: LLVM
AccessModifierOffset: -4
AlignTrailingComments: false
ColumnLimit: 0
NamespaceIndentation: Inner
ObjCSpaceAfterProperty: true
IndentWidth: 4
BreakBeforeBraces: Stroustrup

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OrderedSet is a set-like class that also keeps inserting order like list.

Here are some test results compared with ABC-based OrderedSet:

Boost::MultiIndex-based

	My OrderedSet	ABC-based

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Usage

1. Execute iftgen.py
2. Insert artist name, e.g. 5 Seconds of Summer
3. 5 Seconds of Summer.txt and 5 Seconds of Summer.ac3.txt will be generated
4. Download video from 5 Seconds of Summer.txt and combine them with cat *.ts > combined.ts
5. (Optional) If you want to download 5.1 channel AC-3 audio as well. Download them from 5 Seconds of Summer.ac3.txt and combine them with cat *.ac3 > combined.ac3

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# Copyright (C) 2008 Apple Inc. All Rights Reserved.
# Copyright (C) 2013 Grey Lee. All Rights Reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer. 
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation

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#!/usr/bin/env python
import datetime
import glob
import os
import re
import sys


def main(base_path):
    msgid = set()