如果变量不符合要求，则显示警报视图 (Xcode)

Question

我想让一个警报视图弹出，如果一个变量x大于1000。在iPhone的Xcode中Xcode给出了一个错误:预期表达式在"if"前面

下面是目前为止的代码:

if (x>1000) {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Title", nil)
                                message:NSLocalizedString(@"Message", nil)
                                delegate:nil
                                cancelButtonTitle:NSLocalizedString(@"OK", nil)
                                otherButtonTitles:nil];
    [alert show];
    [alert release];
}

Answer 1

这就是我自己问题的答案:

- (void)textFieldDidEndEditing:(UITextField *)textField {
float x = ([numberOfPeople.text floatValue]);
if (x>1000) {
    UIAlertView *objAlert = [[UIAlertView alloc] 
initWithTitle:@"Fehler" message:@"The entered Number should not be higher than 1000." 
delegate:nil 
cancelButtonTitle:nil 
otherButtonTitles:@"Close",nil];
    [objAlert show];
    textField.text=@""; // clears the text field
}

}