UIAlertView添加NSString

Question

我想在我的UIAlertView消息中添加字符串

-(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];


}

但它会抛出

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的消息中呢？

Answer 1

当您将NSException投射为NSString时，NSException不会突然变成reason。 NSString *reason = exp.reason;有一个名为{{1}}的属性，这是您需要的属性。像这样使用它：{{1}}