在 xcode 中使用 try catch 块是否在真实设备上显示错误？
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does using try catch block in xcode show error on real device?
提问by Rahul Vyas
my application is running fine in simulator...but not on real device....and i have jailbroken iphone so i am unable to debug through device...if i use try catch something like this
我的应用程序在模拟器中运行良好......但不是在真实设备上......而且我已经越狱了 iphone 所以我无法通过设备进行调试......如果我使用 try catch 这样的东西
@try
{
Statements
}
@catch (NSException *ex) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:[NSString stringWithFormat:@"%@",ex]
delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];
}
will my application show error on alertview before crashing?
我的应用程序会在崩溃前在警报视图上显示错误吗？
if not how could i find where is the bug?
如果不是，我怎么能找到错误在哪里？
采纳答案by Daniel
Catching the exception means you are doing something in response to this "error" coming about and it wont crash the application , thats the point of catching exceptions-to tell how to handle cases where errors arrise so your app wont crash, so yes the alert view will show...
捕捉异常意味着你正在做一些事情来响应这个“错误”的发生，它不会使应用程序崩溃，这就是捕捉异常的重点——告诉如何处理出现错误的情况，这样你的应用程序就不会崩溃，所以是警报视图将显示...
回答by slf
That will work so long as your @catch block doesn't throw any exceptions while trying to build the UIAlertView. Make sure you releaseor autoreleaseit, and support the UIAlertViewDelegateprotocol.
只要您的 @catch 块在尝试构建UIAlertView. 确保您release或autorelease它，并支持UIAlertViewDelegate协议。
回答by slf
Try this:
尝试这个：
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:[ex name]
message:[ex reason]
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles: nil];
