UIwindow ---密码框

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程序运行显示结果如下 :

验证密码输入错误显示如下:

代码如下 :

1>

//
//  PasswordInputWindow.m
//  UIWindow--密码框
//
//  Created by mac1 on 15/10/5.
//  Copyright (c) 2015年 www.iphonetrain.com. All rights reserved.
//

#import "PasswordInputWindow.h"

@interface PasswordInputWindow  ()

@property (nonatomic,strong)UITextField *textField;


@end
@implementation PasswordInputWindow

static id instance = nil;

//单例方法创建对象
+ (PasswordInputWindow *)shareInstance
{
    //GCD实现单例
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken,^{
      
       instance =[[self alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
        
    });
    
    return instance;
}
                  

- (id)initWithFrame:(CGRect)frame
{
    if (self == [super initWithFrame:frame]) {
        
        //创建Label
        UILabel *label=[[UILabel alloc]initWithFrame:CGRectMake(10, 50, 200, 20)];
        label.text=@"请输入密码";
        [self addSubview:label];
        
        
        //创建输入框
        _textField=[[UITextField alloc]initWithFrame:CGRectMake(10, 80, 200, 20)];
        _textField.backgroundColor=[UIColor whiteColor];
        _textField.secureTextEntry=YES;
        [self addSubview:_textField];
        
        
        //创建按钮
        UIButton *button=[[UIButton alloc] initWithFrame:CGRectMake(10, 110, 200, 44)];
        [button setBackgroundColor:[UIColor blueColor]];
        button.titleLabel.textColor=[UIColor blackColor];
        [button setTitle:@"确定" forState:UIControlStateNormal];
        [button addTarget:self action:@selector(completeButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:button];

        self.backgroundColor=[UIColor greenColor];
    }
    return self;
}

//显示
- (void)show
{
    
    //使窗口可显示
    [self makeKeyAndVisible];

    //窗口不隐藏
    self.hidden=NO;
    
}


//密码错误调用的方法
-(void)showErrorAlertView
{
    UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"输入密码错误" message:@"密码输入错误" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定",nil];
    
    [alertView show];
    
}


//"确定"按钮触发的方法
- (void)completeButtonPressed:(id)sender{
    if ([_textField.text isEqualToString:@"abcd"]) {
        
        //键盘失去第一响应
        [_textField resignFirstResponder];
        //窗口为第一响应者
        [self resignFirstResponder];
        self.hidden=YES;
    }else{
        
        [self showErrorAlertView];
    }
}
@end

2>

外部控制器调用 :

//
//  ViewController.m
//  UIWindow--密码框
//
//  Created by mac1 on 15/10/5.
//  Copyright (c) 2015年 www.iphonetrain.com. All rights reserved.
//

#import "ViewController.h"
#import "PasswordInputWindow.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
   
    //单例创建对象
    PasswordInputWindow *passView = [PasswordInputWindow shareInstance];

    //让窗口显示
    [passView show];
        
}
@end

UIwindow ---密码框

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原文地址：http://www.cnblogs.com/pengsi/p/4855629.html