objective-c - UIAlertView 添加 NSString

Question

我想将字符串添加到我的 UIAlertView 消息中

-(void) errorState:(NSException *) exp
{
    NSLog(@"Error State Blood Level3 %@",exp);
    NSString * myString = (NSString*)exp;
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:myString delegate:self cancelButtonTitle:@"Go to the main menu" otherButtonTitles:nil];
    [alert show];
    [alert release];<p></p>

}

but it throws

2010-07-15 12:48:34.721 kndFrameV02[7955:207] -[NSException isEqualToString:]: unrecognized selector sent to instance 0x707b2e0
2010-07-15 12:48:34.724 kndFrameV02[7955:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSException isEqualToString:]: unrecognized selector sent to instance 0x707b2e0'

那么如何将字符串变量添加到 UIAlertView 的消息中？

Answer 1

当您将其转换为一个 NSException 时，它不会突然变成 NSString。 NSException 有一个名为 reason 的属性，这就是您需要的属性。像这样使用它:NSString *reason = exp.reason;