MATLAB App Designer设计中，数据导入按钮的回调函数怎么写

可以这样写：

function importDataButtonPushed(app, event)
% 打开数据导入对话框
[filename, path] = uigetfile({'*.csv';'*.xlsx';'*.mat'}, '选择数据文件');
% 判断用户是否取消选择
if isequal(filename,0)
return;
end
% 读取数据
data = []; % 存储读取的数据
[~,~,extension] = fileparts(filename); % 获取文件扩展名
switch lower(extension)
case {'.csv','.txt'}
data = readtable(fullfile(path,filename),'Delimiter',',');
case '.xlsx'
data = readtable(fullfile(path,filename),'Sheet','Sheet1');
case '.mat'
data = load(fullfile(path,filename));
end
% 将读取的数据赋值给表格
app.DataTable.Data = data;
end