我做了一个类似于下面看到的苹果的列表,但我真的不喜欢 UInavigation 栏的样子。理想情况下,我希望它更小或将其隐藏,以便我可以将自己的观点放在那里。
我试图通过使用苹果外观 api 中的以下内容来隐藏它
init() {
UINavigationBar.appearance().backgroundColor = .green
UINavigationBar.appearance().isHidden = true
}
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与拥有巨大的标题相比,即使拥有这样的导航栏也会更理想
但这没有影响,有没有人有任何建议或想法,我可以如何自定义它以使其更像我想要的那样?
所以我正在读取长度未知的xml文件,并将每个元素读入列表结构.现在,一旦我到达文件的末尾,我继续阅读,这会导致异常.现在我只是抓住这个例外并继续我的生活,但是有更清洁的方法吗?
try
{
while(!textReader.EOF)
{
// Used to store info from each command as they are read from the xml file
ATAPassThroughCommands command = new ATAPassThroughCommands ();
// the following is just commands being read and their contents being saved
XmlNodeType node = textReader.NodeType;
textReader.ReadStartElement( "Command" );
node = textReader.NodeType;
name = textReader.ReadElementString( "Name" );
node = textReader.NodeType;
CommandListContext.Add(name);
command.m_Name = name;
command.m_CMD = Convert .ToByte(textReader.ReadElementString("CMD" ),16);
command.m_Feature = Convert .ToByte(textReader.ReadElementString("Feature" ),16);
textReader.ReadEndElement(); //</command>
m_ATACommands.Add(command);
}
}
catch ( Exception …Run Code Online (Sandbox Code Playgroud) 所以我正在创建一个CSV文件,每次动作发生时我都想将数据写入文件.我遇到的问题是它会在第二次进入时覆盖数据.如何将数据添加到文件末尾?
public boolean save_to_csv(){
//check if directory exists, if not create the folder
File folder = new File(Environment.getExternalStorageDirectory() + "/HKA_CAL");
//Environment.getExternalStorageDirectory() get the location of external storage
boolean success = true;
if(!folder.exists())
{
success = folder.mkdir();
}
if (success)
{
//success is true if folder has successfully been created
//now we can create/check if the file exists
File stored_hka = new File(Environment.getExternalStorageDirectory()+"/HKA_CAL/Stored_values.csv");
boolean file_existed=true;
try{
if(!stored_hka.exists()){
stored_hka.createNewFile();
file_existed=false;
}
FileOutputStream fOut = new FileOutputStream(stored_hka);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
if(!file_existed){ …Run Code Online (Sandbox Code Playgroud)