Question

我正在尝试为用户创建登录名以输入用户名和密码。我正在使用Xcode 4.5。这是我的.h文件代码：

    #import <UIKit/UIKit.h>
    #import "AccountViewController.m"

    @interface AccountViewController : UIViewController {


    }


    - (IBAction) alert: (id)sender;

    @end

这是我的.m文件代码：

    #import "AccountViewController.h"



    @implementation AccountViewController


    - (IBAction)alert:(id)sender
    {
    UIAlertView *alert =[[UIAlertView alloc] initWithTitle:@"Log In" message:@"Please enter      your    Username and Password" delegate:self cancelButtonTitle:@"Log In"         otherButtonTitles:@"Cancel", nil];

    [alert addTextFieldWithValue:@"" label:@"Username"];
    [alert addTextFieldWithValue:@"" label:@"Password"];

    UITextField *tf = [alert textFieldAtIndex:0];
    tf.clearButtonMode = UITextFieldViewModeWhileEditing;
    tf.keyboardType = UIKeyboardTypeAlphabet;
    tf.keyboardAppearance = UIKeyboardAppearanceAlert;
    tf.autocapitalizationType = UITextAutocapitalizationTypeWords;
    tf.autocorrectionType = UITextAutocorrectionTypeNo;

    tf = [alert textFieldAtIndex:1];
    tf.clearButtonMode = UITextFieldViewModeWhileEditing;
    tf.keyboardType = UIKeyboardTypeURL;
    tf.keyboardAppearance = UIKeyboardAppearanceAlert;
    tf.autocapitalizationType = UITextAutocapitalizationTypeWords;
    tf.autocorrectionType = UITextAutocorrectionTypeNo;

    [alert show];


    }

    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
    }


    - (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
    // Release anything that's not essential, such as cached data
    }


    - (void)dealloc {

    }



    @end

此处的错误发生在.m文件中，用于以下每行代码：

    [alert addTextFieldWithValue:@"" label:@"Username"];
    [alert addTextFieldWithValue:@"" label:@"Password"];

错误是：'UIAlertView'没有可见的@interface声明选择器'addTextFieldWithValue：label：'

任何帮助都将不胜感激。

谢谢！

Answer 1

addTextFieldWithValue在这做什么？ UIAlertView下没有列出此类方法。

此外，如果您要处理提醒按钮上的点击事件，请在您的课程中加入UIAlertViewDelegate。

使用UIAlertView创建登录视图

1 个答案: