
1. 从本地加载图片

```python
img = QImage("/Users/admin/Desktop/hello.png")
pimg = QPixmap.fromImage(image)
self.imgLabel.setPixmap(pimg)
```

2. 图片铺满QLabel

```python
img = QImage("/Users/admin/Desktop/hello.png")
pimg = QPixmap.fromImage(image)
self.imgLabel.setPixmap(pimg)
self.imgLabel.setScaledContents(True)
```

3. 等比例显示未知大小的图片

```python
img = QImage("/Users/admin/Desktop/hello.png")
pimg = QPixmap.fromImage(image)

fw = self.imgLabel.width() / width
fh = self.imgLabel.height() / height

factor = min(fw, fh)

width = int(width * factor)
height = int(height * factor)
nimg = img.scaled(width, height, QtCore.Qt.KeepAspectRatio, QtCore.Qt.SmoothTransformation)
self.imgLabel.setPixmap(nimg)
```



如何能像css那样max-width/max-height等比例缩放居中显示图片

pyqt5加载图片，等比例显示图片




### 1. qtablewidget增加选择框？

```
cb = QtWidgets.QTableWidgetItem()
# item 转为checkbox，样式受checkbox样式影响
cb.setFlags(QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsEnabled)
# 居中
cb.setTextAlignment(QtCore.Qt.AlignCenter)
# 选中状态
cb.setCheckState(QtCore.Qt.Unchecked if not row.checked else QtCore.Qt.Checked)
# i：第i行，0：第0列，
self._table_widget.setItem(i, 0, cb)
```

样式：

```qss
/*---------qcheckbox-----------*/
QCheckBox {
}

QCheckBox::indicator {
    /* 选择框尺寸 */
}

QCheckBox::indicator::checked:pressed {
    image:url(:/resource/checkbox-checked.png);
}
QCheckBox::indicator::checked {
    image:url(:/resource/checkbox-checked.png);
}
```

效果：![qtablewidget-checkbox](/images/blog/1/pyqt/assert/qtablewidget-checkbox.png)



### 2. QTableWidget设置进度条QProgressBar

```python
bar = QtWidgets.QProgressBar()
bar.setMinimum(0)
bar.setMaximum(100)
bar.setValue(100)
bar.setTextVisible(True)
self._table_widget.setCellWidget(0, 4, bar)
```

样式

```css
QProgressBar {
    text-align: right;
    vertical-align: center;
    padding-right: 40px;
    color: $selectBackground;
}

QProgressBar::chunk {
    background-color: $selectBackground;
    width: 10px;
    margin: 0.5px;
    text-align: center;
}
```

效果![qtablewidget_qprocessbar](../../../../Desktop/qtablewidget_qprocessbar.png)



### QTableWidget导出excel，待整理

https://blog.csdn.net/weixin_41882459/article/details/108394548

qtablewidget增加选择框|QTableWidget设置进度条QProgressBar

pyqt5 qtablewidget用法总结


mac签名打包的坑比较深：有需求的朋友可以加微信  私聊



## app打包

python打包工具用的pyinstaller

```shell
bundle="com.douyacun.pdftools"
appname="PDF工具箱"
echo ">>>> 清理"
sudo rm -rf dist build
echo ">>>> 打包"
sudo pyinstaller \
  --windowed \
  --onedir \
  --icon=assert/icon.icns \
  --osx-bundle-identifier=${bundle} \
  main.py \
  --name ${appname}
sudo pyinstaller --clean --noconfirm $appname.spec
```

介绍一下打包参数：

--onedir 打包成目录，启动速度明显提示。最后可以打包成dmg

--osx-bundle-identifier 指定应用包名，签名需要用到



## app 签名

 [https://idmsa.apple.com/IDMSWebAuth/signin](https://idmsa.apple.com/IDMSWebAuth/signin)

签名证书的申请流程参考知乎：[https://zhuanlan.zhihu.com/p/431634112](https://zhuanlan.zhihu.com/p/431634112)

```shell
#echo ">>>> 签名修复"
sudo python for_codesign.py dist/PDF工具箱.app

#echo ">>>> 签名"
sudo codesign -s "Developer ID Application: * Enterprise Management Co., Ltd (P*)" -f --entitlements entitlements.plist --timestamp --all-architectures  --deep --options=runtime ～/Documents/github.com/pdf-tools/dist/PDF工具箱.app
```

签名脚本报错：

```
bundle format unrecognized, invalid, or unsuitabl

Contents/MacOS/PyQt5/Qt5/qml/QtQml/Models.2
```

这个错误就是因为codesign不支持目录名带 点 `Models.2`

解决方案就是：将 `Models.2`  改成 `Models_2` , 然后再将 `Models_2` 创建软链到 `Models.2`



pyintaller 给出的解决方案是将 `Models.2` 转移到 `/Contents/Resources/` 下，然后软链过来

https://github.com/pyinstaller/pyinstaller/wiki/Recipe-OSX-Code-Signing-Qt

此方案已经不通了，mac公证时要求所有用到的文件都需要签名：

```
The signature of the binary is invalid.
```



签名修复脚本：

```python
# -*- coding: utf-8 -*-
import os
import shutil
import sys
from pathlib import Path
from typing import Generator, List, Optional

from macholib.MachO import MachO


def find_problematic_folders(folder: Path) -> Generator[Path, None, None]:
    for path in folder.iterdir():
        if not path.is_dir() or path.is_symlink():
            # Skip simlinks as they are allowed (even with a dot)
            continue
        if "." in path.name:
            yield path
        else:
            yield from find_problematic_folders(path)


def main(args: List[str]) -> int:
    """
    修复mac签名
    - 重命名.2目录为 _2
    - 创建软链
    """
    for app in args:
        name = os.path.basename(app)
        print(f">>> [{name}] Fixing Qt folder names")
        path = Path(os.path.abspath(app)) / "Contents" / "MacOS"
        for folder in find_problematic_folders(path):
            dest = Path(str(folder).replace(".2", "_2"))
            shutil.move(folder, dest)
            os.symlink(dest, folder)
            print(f" !! Fixed {folder}")


if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))

```



## app打包dmg

我是用的dmg canvas

https://www.jianshu.com/p/f07a8351a14f



## dmg公证

 [https://appleid.apple.com/sign-in](https://appleid.apple.com/sign-in)

需要对应用创建专用密码

![image-20230111232411436](/images/blog/pyqt/assert/image-20230111232411436.png)

```
# 上传app
xcrun altool --notarize-app \
             --primary-bundle-id="com.douyacun.pdftools" \
             --username="账号" \
             --password="APP专用密码" \
             -t="osx" \
             --asc-provider="密钥证书编号" \
             --file "pdf工具箱.dmg"
# 查看公正结果
 xcrun altool --notarization-info "1669889c-3c11-45f3-ad0a-525e3565bdaf" -u "gqjk2021@163.com" --password "app专用密码"
```



No errors getting notarization info.

       Date: 2023-01-11 15:14:44 +0000
       Hash: 904cbbba016a86cf32cdfed8f3762da219d3f0230e7f4d5ac975264d8b34f319
       RequestUUID: 1669889c-3c11-45f3-ad0a-525e3565bdaf
       Status: in progress



解决安装时提示：安装包已损坏，无法打开 或 来自不明开发者的解决办法

pyqt5 mac打包签名公证


# 批量下载视频文件，不影响GUI运行，GUI展示相应的进度

版本

- 平台
  - mac 11
  - windows 10

- QT：5.15.7

- aiohttp: 3.8.3
- qasync: 0.23.0

**思路一：**

启动一个线程QThread后台去执行，下载任务和下载进度 都是 通过pyqtSignal进行交互

```python
class DownloadThread(QtCore.QThread):
    def __init__(self):
        super(DownloadThread, self).__init__()

    def run(self) -> None:
        loop = qasync.QEventLoop(self)
        asyncio.set_event_loop(loop)
        loop.run_forever()


class Download(QtCore.QObject):
    url_signal = pyqtSignal(str)
    progress_signal = pyqtSignal(str)

    def __init__(self):
        super(Download, self).__init__()
        self.url_signal.connect(self.schedule)

		@asyncSlot(str)
    async def schedule(self, data):
        if data == "":
            return
        video = json.loads(data, object_hook=decodeVideo)
        loop = asyncio.get_event_loop()
        loop.set_exception_handler(self.exception_handle)
        session_timeout = aiohttp.ClientTimeout(total=None, sock_connect=10)
        async with aiohttp.ClientSession(loop=loop, timeout=session_timeout) as session:
            cwlist = [loop.create_task(self.fetch_limit(semaphore, session, video, dir)) for video in videos]
            await asyncio.gather(*cwlist)
          
    async def fetch(self, video):
      	filename = video.title if video.title else video.id
        file = path.join(dir, filename + ".mp4")
        try:
            with open(file, "wb+") as fd:
                logging.info("%s\t%s\t%s" % (video.title, video.video_url, file))
                # 在windows上这里会被卡住，不再仅需运行，替换使用requests都可以正常返回
                async with session.get(video.video_url, headers=self.getHeaders()) as resp:
                    video.content_length = resp.headers["Content-Length"]
                    logging.info("content-length: " + video.content_length)
                    logging.info("file: " + file)
                    async for chunk in resp.content.iter_chunked(chunk_size):
                        fd.write(chunk)
                        video.size += len(chunk)
                        video.progress = int(video.size / int(video.content_length) * 100)
                        self.progress_signal.emit(json.dumps(video, default=encodeVideo))
        except asyncio.exceptions.TimeoutError as e:
            print("fetch timeout: ", e)
                        
 class Batch(QtWidgets.QWidget):
    def __init__(self, context: Context):
        super(IndexBatch, self).__init__()
        self.context = context
        self.thread = DownloadThread()
        self.download = Download()
        self.download.moveToThread(self.thread)
        self.thread.start()
        self.setUi()                       
		
    def onDownload(self):
        for video in self._videos:
            if video.checked:
                self.download.url_signal.emit(json.dumps(video, default=encodeVideo),
                                              path.join(self.save_dir, self._author_nickname))
```

问题：

思路一的代码在mac上可以运行，session请求是可以响应的，但是在win10上，`async with session.get(video.video_url) as resp` 会被卡住不再执行，解决思路

- 使用`reqeusts.get(video.video_url)`是可以正常响应的
- aiohttp设置sock_connect没有收到`asyncio.exceptions.TimeoutError` 异常打印，可能是`async with session.get`没有进入到执行队列中去～

**思路二**

尝试去掉DownloadThread执行下载任务的思路，直接将下载任务放到异步执行队列(loop)中去

```python
class Download(QtCore.QObject):
    progress_signal = pyqtSignal(str)

    def __init__(self):
        super(Download, self).__init__()

    async def schedule(self, videos, dir: str):
        logging.info("download count: %d" % (len(videos)))
        loop = asyncio.get_event_loop()
        loop.set_exception_handler(self.exception_handle)
        session_timeout = aiohttp.ClientTimeout(total=None, sock_connect=10)
        async with aiohttp.ClientSession(loop=loop, timeout=session_timeout) as session:
            cwlist = [loop.create_task(self.fetch(semaphore, session, video, dir)) for video in videos]
            await asyncio.gather(*cwlist)

    def exception_handle(self, *args):
        logging.info("asyncio.exception.handle: {}" % args)

    async def fetch(self, session, video, dir):
        filename = video.title if video.title else video.id
        file = path.join(dir, filename + ".mp4")
        with open(file, "wb+") as fd:
          logging.info("%s\t%s\t%s" % (video.title, video.video_url, file))
          async with session.get(video.video_url, headers=self.getHeaders()) as resp:
            video.content_length = resp.headers["Content-Length"]
            async for chunk in resp.content.iter_chunked(chunk_size):
              fd.write(chunk)
              video.size += len(chunk)
              video.progress = int(video.size / int(video.content_length) * 100)
              self.progress_signal.emit(json.dumps(video, default=encodeVideo))
              
class Batch(QtWidgets.QWidget):
    def __init__(self, context: Context):
        super(IndexBatch, self).__init__()
        self.context = context
        self.download = Download()
        self.setUi()                       
		
    def onConnect(self):
        self._ui.download_btn.clicked.connect(self.onDownload)
        self.download.progress_signal.connect(self.onDownloadProcess)

    # 订阅Download下载进度更新进度条
    def onDownloadProcess(self, data):
        vd = json.loads(data, object_hook=decodeVideo)
        bar = self._progress_bar_dict[vd.id]
        bar.setValue(vd.progress)
        
    @asyncSlot()
    async def onDownload(self):
        videos = []
        for video in self._videos:
            if video.checked and video.progress == 0:
                videos.append(video)
        await self.download.schedule(videos, self.save_dir)
        
async def main():
    def close_future(future, loop):
        loop.call_later(10, future.cancel)
        future.cancel()

    loop = asyncio.get_event_loop()
    future = asyncio.Future()

    app = QApplication.instance()
    if hasattr(app, "aboutToQuit"):
        getattr(app, "aboutToQuit").connect(
            functools.partial(close_future, future, loop)
        )
    m = MainWindow()
    m.run()
    await future


if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO)
    QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)
    try:
        qasync.run(main())
    except asyncio.exceptions.CancelledError:
        sys.exit(1)
```

**效果截图**

![pyqt5-asyncio-download](/images/blog/pyqt/assert/pyqt5-asyncio-download.png)



# 异步加载图片，不影响GUI运行, 待补充





异步批量下载和多线程还是有区别，就是协程和线程的区别

pyqt5异步批量下载


mac签名打包的坑比较深：有需求的朋友可以加微信  私聊



## app打包

python打包工具用的pyinstaller

```shell
bundle="com.douyacun.pdftools"
appname="PDF工具箱"
echo ">>>> 清理"
sudo rm -rf dist build
echo ">>>> 打包"
sudo pyinstaller \
  --windowed \
  --onedir \
  --icon=assert/icon.icns \
  --osx-bundle-identifier=${bundle} \
  main.py \
  --name ${appname}
sudo pyinstaller --clean --noconfirm $appname.spec
```

介绍一下打包参数：

--onedir 打包成目录，启动速度明显提示。最后可以打包成dmg

--osx-bundle-identifier 指定应用包名，签名需要用到



## app 签名

 [https://idmsa.apple.com/IDMSWebAuth/signin](https://idmsa.apple.com/IDMSWebAuth/signin)

签名证书的申请流程参考知乎：[https://zhuanlan.zhihu.com/p/431634112](https://zhuanlan.zhihu.com/p/431634112)

```shell
#echo ">>>> 签名修复"
sudo python for_codesign.py dist/PDF工具箱.app

#echo ">>>> 签名"
sudo codesign -s "Developer ID Application: * Enterprise Management Co., Ltd (P*)" -f --entitlements entitlements.plist --timestamp --all-architectures  --deep --options=runtime ～/Documents/github.com/pdf-tools/dist/PDF工具箱.app
```

签名脚本报错：

```
bundle format unrecognized, invalid, or unsuitabl

Contents/MacOS/PyQt5/Qt5/qml/QtQml/Models.2
```

这个错误就是因为codesign不支持目录名带 点 `Models.2`

解决方案就是：将 `Models.2`  改成 `Models_2` , 然后再将 `Models_2` 创建软链到 `Models.2`



pyintaller 给出的解决方案是将 `Models.2` 转移到 `/Contents/Resources/` 下，然后软链过来

https://github.com/pyinstaller/pyinstaller/wiki/Recipe-OSX-Code-Signing-Qt

此方案已经不通了，mac公证时要求所有用到的文件都需要签名：

```
The signature of the binary is invalid.
```



签名修复脚本：

```python
# -*- coding: utf-8 -*-
import os
import shutil
import sys
from pathlib import Path
from typing import Generator, List, Optional

from macholib.MachO import MachO


def find_problematic_folders(folder: Path) -> Generator[Path, None, None]:
    for path in folder.iterdir():
        if not path.is_dir() or path.is_symlink():
            # Skip simlinks as they are allowed (even with a dot)
            continue
        if "." in path.name:
            yield path
        else:
            yield from find_problematic_folders(path)


def main(args: List[str]) -> int:
    """
    修复mac签名
    - 重命名.2目录为 _2
    - 创建软链
    """
    for app in args:
        name = os.path.basename(app)
        print(f">>> [{name}] Fixing Qt folder names")
        path = Path(os.path.abspath(app)) / "Contents" / "MacOS"
        for folder in find_problematic_folders(path):
            dest = Path(str(folder).replace(".2", "_2"))
            shutil.move(folder, dest)
            os.symlink(dest, folder)
            print(f" !! Fixed {folder}")


if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))

```



## app打包dmg

我是用的dmg canvas

https://www.jianshu.com/p/f07a8351a14f



## dmg公证

 [https://appleid.apple.com/sign-in](https://appleid.apple.com/sign-in)

需要对应用创建专用密码

![image-20230111232411436](/images/blog/1/pyqt/assert/image-20230111232411436.png)

```
# 上传app
xcrun altool --notarize-app \
             --primary-bundle-id="com.douyacun.pdftools" \
             --username="账号" \
             --password="APP专用密码" \
             -t="osx" \
             --asc-provider="密钥证书编号" \
             --file "pdf工具箱.dmg"
# 查看公正结果
 xcrun altool --notarization-info "1669889c-3c11-45f3-ad0a-525e3565bdaf" -u "gqjk2021@163.com" --password "app专用密码"
```



No errors getting notarization info.

       Date: 2023-01-11 15:14:44 +0000
       Hash: 904cbbba016a86cf32cdfed8f3762da219d3f0230e7f4d5ac975264d8b34f319
       RequestUUID: 1669889c-3c11-45f3-ad0a-525e3565bdaf
       Status: in progress






### 1. qtablewidget增加选择框？

```
cb = QtWidgets.QTableWidgetItem()
# item 转为checkbox，样式受checkbox样式影响
cb.setFlags(QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsEnabled)
# 居中
cb.setTextAlignment(QtCore.Qt.AlignCenter)
# 选中状态
cb.setCheckState(QtCore.Qt.Unchecked if not row.checked else QtCore.Qt.Checked)
# i：第i行，0：第0列，
self._table_widget.setItem(i, 0, cb)
```

样式：

```qss
/*---------qcheckbox-----------*/
QCheckBox {
}

QCheckBox::indicator {
    /* 选择框尺寸 */
}

QCheckBox::indicator::checked:pressed {
    image:url(:/resource/checkbox-checked.png);
}
QCheckBox::indicator::checked {
    image:url(:/resource/checkbox-checked.png);
}
```

效果：![qtablewidget-checkbox](/images/blog/pyqt/assert/qtablewidget-checkbox.png)



### 2. QTableWidget设置进度条QProgressBar

```python
bar = QtWidgets.QProgressBar()
bar.setMinimum(0)
bar.setMaximum(100)
bar.setValue(100)
bar.setTextVisible(True)
self._table_widget.setCellWidget(0, 4, bar)
```

样式

```css
QProgressBar {
    text-align: right;
    vertical-align: center;
    padding-right: 40px;
    color: $selectBackground;
}

QProgressBar::chunk {
    background-color: $selectBackground;
    width: 10px;
    margin: 0.5px;
    text-align: center;
}
```

效果![qtablewidget_qprocessbar](../../../../Desktop/qtablewidget_qprocessbar.png)



### QTableWidget导出excel，待整理

https://blog.csdn.net/weixin_41882459/article/details/108394548


# 批量下载视频文件，不影响GUI运行，GUI展示相应的进度

版本

- 平台
  - mac 11
  - windows 10

- QT：5.15.7

- aiohttp: 3.8.3
- qasync: 0.23.0

**思路一：**

启动一个线程QThread后台去执行，下载任务和下载进度 都是 通过pyqtSignal进行交互

```python
class DownloadThread(QtCore.QThread):
    def __init__(self):
        super(DownloadThread, self).__init__()

    def run(self) -> None:
        loop = qasync.QEventLoop(self)
        asyncio.set_event_loop(loop)
        loop.run_forever()


class Download(QtCore.QObject):
    url_signal = pyqtSignal(str)
    progress_signal = pyqtSignal(str)

    def __init__(self):
        super(Download, self).__init__()
        self.url_signal.connect(self.schedule)

		@asyncSlot(str)
    async def schedule(self, data):
        if data == "":
            return
        video = json.loads(data, object_hook=decodeVideo)
        loop = asyncio.get_event_loop()
        loop.set_exception_handler(self.exception_handle)
        session_timeout = aiohttp.ClientTimeout(total=None, sock_connect=10)
        async with aiohttp.ClientSession(loop=loop, timeout=session_timeout) as session:
            cwlist = [loop.create_task(self.fetch_limit(semaphore, session, video, dir)) for video in videos]
            await asyncio.gather(*cwlist)
          
    async def fetch(self, video):
      	filename = video.title if video.title else video.id
        file = path.join(dir, filename + ".mp4")
        try:
            with open(file, "wb+") as fd:
                logging.info("%s\t%s\t%s" % (video.title, video.video_url, file))
                # 在windows上这里会被卡住，不再仅需运行，替换使用requests都可以正常返回
                async with session.get(video.video_url, headers=self.getHeaders()) as resp:
                    video.content_length = resp.headers["Content-Length"]
                    logging.info("content-length: " + video.content_length)
                    logging.info("file: " + file)
                    async for chunk in resp.content.iter_chunked(chunk_size):
                        fd.write(chunk)
                        video.size += len(chunk)
                        video.progress = int(video.size / int(video.content_length) * 100)
                        self.progress_signal.emit(json.dumps(video, default=encodeVideo))
        except asyncio.exceptions.TimeoutError as e:
            print("fetch timeout: ", e)
                        
 class Batch(QtWidgets.QWidget):
    def __init__(self, context: Context):
        super(IndexBatch, self).__init__()
        self.context = context
        self.thread = DownloadThread()
        self.download = Download()
        self.download.moveToThread(self.thread)
        self.thread.start()
        self.setUi()                       
		
    def onDownload(self):
        for video in self._videos:
            if video.checked:
                self.download.url_signal.emit(json.dumps(video, default=encodeVideo),
                                              path.join(self.save_dir, self._author_nickname))
```

问题：

思路一的代码在mac上可以运行，session请求是可以响应的，但是在win10上，`async with session.get(video.video_url) as resp` 会被卡住不再执行，解决思路

- 使用`reqeusts.get(video.video_url)`是可以正常响应的
- aiohttp设置sock_connect没有收到`asyncio.exceptions.TimeoutError` 异常打印，可能是`async with session.get`没有进入到执行队列中去～

**思路二**

尝试去掉DownloadThread执行下载任务的思路，直接将下载任务放到异步执行队列(loop)中去

```python
class Download(QtCore.QObject):
    progress_signal = pyqtSignal(str)

    def __init__(self):
        super(Download, self).__init__()

    async def schedule(self, videos, dir: str):
        logging.info("download count: %d" % (len(videos)))
        loop = asyncio.get_event_loop()
        loop.set_exception_handler(self.exception_handle)
        session_timeout = aiohttp.ClientTimeout(total=None, sock_connect=10)
        async with aiohttp.ClientSession(loop=loop, timeout=session_timeout) as session:
            cwlist = [loop.create_task(self.fetch(semaphore, session, video, dir)) for video in videos]
            await asyncio.gather(*cwlist)

    def exception_handle(self, *args):
        logging.info("asyncio.exception.handle: {}" % args)

    async def fetch(self, session, video, dir):
        filename = video.title if video.title else video.id
        file = path.join(dir, filename + ".mp4")
        with open(file, "wb+") as fd:
          logging.info("%s\t%s\t%s" % (video.title, video.video_url, file))
          async with session.get(video.video_url, headers=self.getHeaders()) as resp:
            video.content_length = resp.headers["Content-Length"]
            async for chunk in resp.content.iter_chunked(chunk_size):
              fd.write(chunk)
              video.size += len(chunk)
              video.progress = int(video.size / int(video.content_length) * 100)
              self.progress_signal.emit(json.dumps(video, default=encodeVideo))
              
class Batch(QtWidgets.QWidget):
    def __init__(self, context: Context):
        super(IndexBatch, self).__init__()
        self.context = context
        self.download = Download()
        self.setUi()                       
		
    def onConnect(self):
        self._ui.download_btn.clicked.connect(self.onDownload)
        self.download.progress_signal.connect(self.onDownloadProcess)

    # 订阅Download下载进度更新进度条
    def onDownloadProcess(self, data):
        vd = json.loads(data, object_hook=decodeVideo)
        bar = self._progress_bar_dict[vd.id]
        bar.setValue(vd.progress)
        
    @asyncSlot()
    async def onDownload(self):
        videos = []
        for video in self._videos:
            if video.checked and video.progress == 0:
                videos.append(video)
        await self.download.schedule(videos, self.save_dir)
        
async def main():
    def close_future(future, loop):
        loop.call_later(10, future.cancel)
        future.cancel()

    loop = asyncio.get_event_loop()
    future = asyncio.Future()

    app = QApplication.instance()
    if hasattr(app, "aboutToQuit"):
        getattr(app, "aboutToQuit").connect(
            functools.partial(close_future, future, loop)
        )
    m = MainWindow()
    m.run()
    await future


if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO)
    QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)
    try:
        qasync.run(main())
    except asyncio.exceptions.CancelledError:
        sys.exit(1)
```

**效果截图**

![pyqt5-asyncio-download](/images/blog/1/pyqt/assert/pyqt5-asyncio-download.png)



# 异步加载图片，不影响GUI运行, 待补充



