C# Xamarin iOS:启动计时器会使应用程序崩溃,无异常
我正在开发一个Xamarin表单应用程序,我需要为它编写一些本机代码,我的代码在Android上运行,但我无法让它在iOS上运行。在Main.cs中,我使用NSTimer启动一个定时计时器,完成后,该计时器将启动Xamarin应用程序的AppDelegate代码 Main.cs:C# Xamarin iOS:启动计时器会使应用程序崩溃,无异常,c#,ios,xamarin.forms,xamarin.ios,nstimer,C#,Ios,Xamarin.forms,Xamarin.ios,Nstimer,我正在开发一个Xamarin表单应用程序,我需要为它编写一些本机代码,我的代码在Android上运行,但我无法让它在iOS上运行。在Main.cs中,我使用NSTimer启动一个定时计时器,完成后,该计时器将启动Xamarin应用程序的AppDelegate代码 Main.cs: public class Application { private static ISettings AppSettings => CrossSettings.Current; private
public class Application
{
private static ISettings AppSettings => CrossSettings.Current;
private static double startTimeMillis;
static void Main(string[] args)
{
startTimeMillis = DateTime.Now.Ticks / TimeSpan.TicksPerSecond;
CheckSavedToken(args);
}
private static void CheckSavedToken(string[] args)
{
if (AppSettings.Contains(App.LoginToken))
{
string loginToken = AppSettings.GetValueOrDefault(App.LoginToken, string.Empty);
if (loginToken == string.Empty)
{
AppSettings.Remove(App.LoginToken);
}
}
double delay = 750 - (DateTime.Now.Ticks / TimeSpan.TicksPerSecond - startTimeMillis);
if (delay > 0)
{
NSTimer.CreateScheduledTimer(delay, timer => UIApplication.Main(args, null, "AppDelegate"));
}
else
{
UIApplication.Main(args, null, "AppDelegate");
}
}
}
我想检查一个登录令牌,并在这个屏幕上停留,直到750毫秒过去,然后AppDelegate可以启动Xamarin表单应用的一部分
我不知道我做错了什么,我试着用try-catch进行调试,但是应用程序在没有达到catch的情况下崩溃了,我也试着使用Task.Delay()
,但这也起到了同样的作用。即使我将时间量设置为1,仍然不会发生任何事情
编辑:
public class Application
{
private static ISettings AppSettings => CrossSettings.Current;
private static double startTimeMillis;
static void Main(string[] args)
{
startTimeMillis = DateTime.Now.Ticks / TimeSpan.TicksPerSecond;
CheckSavedToken(args);
}
private static void CheckSavedToken(string[] args)
{
if (AppSettings.Contains(App.LoginToken))
{
string loginToken = AppSettings.GetValueOrDefault(App.LoginToken, string.Empty);
if (loginToken == string.Empty)
{
AppSettings.Remove(App.LoginToken);
}
}
double delay = 750 - (DateTime.Now.Ticks / TimeSpan.TicksPerSecond - startTimeMillis);
if (delay > 0)
{
NSTimer.CreateScheduledTimer(delay, timer => UIApplication.Main(args, null, "AppDelegate"));
}
else
{
UIApplication.Main(args, null, "AppDelegate");
}
}
}
我还尝试使用DispatchQueue(结果相同):
我希望有人能帮我。
提前感谢。原因:
public class Application
{
private static ISettings AppSettings => CrossSettings.Current;
private static double startTimeMillis;
static void Main(string[] args)
{
startTimeMillis = DateTime.Now.Ticks / TimeSpan.TicksPerSecond;
CheckSavedToken(args);
}
private static void CheckSavedToken(string[] args)
{
if (AppSettings.Contains(App.LoginToken))
{
string loginToken = AppSettings.GetValueOrDefault(App.LoginToken, string.Empty);
if (loginToken == string.Empty)
{
AppSettings.Remove(App.LoginToken);
}
}
double delay = 750 - (DateTime.Now.Ticks / TimeSpan.TicksPerSecond - startTimeMillis);
if (delay > 0)
{
NSTimer.CreateScheduledTimer(delay, timer => UIApplication.Main(args, null, "AppDelegate"));
}
else
{
UIApplication.Main(args, null, "AppDelegate");
}
}
}
主方法用于启动应用程序
UIApplication.Main(args, null, "AppDelegate")
我认为您的问题是因为您在尝试在此应用程序中执行某些操作时,甚至没有启动应用程序。因此,它会毫无例外地崩溃
解决方案:
public class Application
{
private static ISettings AppSettings => CrossSettings.Current;
private static double startTimeMillis;
static void Main(string[] args)
{
startTimeMillis = DateTime.Now.Ticks / TimeSpan.TicksPerSecond;
CheckSavedToken(args);
}
private static void CheckSavedToken(string[] args)
{
if (AppSettings.Contains(App.LoginToken))
{
string loginToken = AppSettings.GetValueOrDefault(App.LoginToken, string.Empty);
if (loginToken == string.Empty)
{
AppSettings.Remove(App.LoginToken);
}
}
double delay = 750 - (DateTime.Now.Ticks / TimeSpan.TicksPerSecond - startTimeMillis);
if (delay > 0)
{
NSTimer.CreateScheduledTimer(delay, timer => UIApplication.Main(args, null, "AppDelegate"));
}
else
{
UIApplication.Main(args, null, "AppDelegate");
}
}
}
在Main方法之后要延迟的地方添加延迟代码
您可以在iOS中添加到FinishedLaunching
。AppDelegate.cs:
public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
global::Xamarin.Forms.Forms.Init();
startTimeMillis = DateTime.Now.Ticks / TimeSpan.TicksPerSecond;
double delay = 750 - (DateTime.Now.Ticks / TimeSpan.TicksPerSecond - startTimeMillis);
if (delay > 0)
{
Task.Delay(5000).Wait();
LoadApplication(new App());
return base.FinishedLaunching(app, options);
}
else
{
LoadApplication(new App());
return base.FinishedLaunching(app, options);
}
}
你为什么要推迟启动?我想让这个屏幕至少显示750毫秒,这样它就不会只是一系列的闪烁了