iPhone SDK简单警报消息问题

Question

char asd='a';
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Are you sure?" message:asd
               delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
[alert show];
[alert release];

above code not compiling in iPhone simulator. Why is that? :)

Answer 1

You're trying to pass a char where an NSString is expected. Read up on Objective-C and th Cocoa/Cocoa Touch documentation.

To fix your issue, try this:

NSString *asd = @"a";
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Are you sure?" message:asd
               delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
[alert show];
[alert release];

Answer 2

1. You don't compile in the iPhone simulator, you compile on your mac.
2. Do you get an error message?
3. The message parameter should be an NSString , not a char ?

Answer 3

replace

char asd='a';

With

NSString *asd=@"a";

It should compile after it...