显示与Cocoa的警报 [英] Showing an alert with Cocoa

问题描述

我一直在使用VB.NET一段时间，我切换到Xcode 4。

I have been using VB.NET for a while and I switched to Xcode 4.

在VB.NET环境中，我用来键入以下命令一个按钮：

In the VB.NET environment, I used to type the following command in a button:

if TextBox1.text="" then
    MessageBox.Show("You can't leave the textbox empty!, "Error!")
else
    Label1.text = TextBox1.text

$ b b

这只是一个例子在Xcode中，我想做同样的事情，除了我想有一个弹出警报（在iPhone中），而不是VB.NET中的MessageBox。

That is just an example. In Xcode, I want to do the same thing except for I want to have a Pop-Up Alert (in the iPhone) instead of the MessageBox in VB.NET.

任何想法？

推荐答案

if ([TextBox1.text isEqualToString:@""]){
    UIAlertView *errorAlert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                         message:@"You can't leave the textbox empty!"
                                                        delegate:nil
                                               cancelButtonTitle:@"OK"
                                               otherButtonTitles:nil];
    [errorAlert show];
    [errorAlert release];
} else {
    Label1.text = TextBox1.text;
}

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