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ios/mac/COCOA系列 -- UIALertVIew 学习笔记

最近在学习ios开发,学习的书籍《ios7 Pragramming cookbook》,做笔记的目的以后方便查看。笔记形式是小例子,将书上的例子书写完整。

 UIAlertViewClass 的使用场景

   1,向用户以一个警告的形式显示信息。

   2,让用户确认一些动作

   3,让用户输入用户名和密码

   4,让用户输入一些文本,这些文本在程序被使用

 例1   实现简单显示一些警告信息

       新建一个 Single View Application 简单工程,工程名字维AlterView,扩展前缀CB

       

 代码如下:

#import "CBViewController.h"@interface CBViewController ()@end@implementation CBViewController- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    UIAlertView *alterView  = [[UIAlertView alloc]                               initWithTitle:@"学些MAC/IOS开发"                               message:@"一个UIAlterView的例子"                               delegate:self                               cancelButtonTitle:@"取消"                               otherButtonTitles:@"确定", nil];    [alterView show] ;}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

运行结果示意图  

       

 

例2  让用户输入账号和密码 ,log输出账号和密码

    要获得用户点击的是那个按钮可以在 代码实现 UIAlertViewDelegate 代理中下面的方法

// Called when a button is clicked. The view will be automatically dismissed after this call returns

// 用于点击按钮是被调用,返回被调用button的索引

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;

   

#import "CBViewController.h"@interface CBViewController ()<UIAlertViewDelegate> //添加代理@end@implementation CBViewController- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.        UIAlertView *alterView  = [[UIAlertView alloc]                               initWithTitle:@"学些MAC/IOS开发"                               message:@"请输入你的账号和密码"                               delegate:self                               cancelButtonTitle:@"取消"                               otherButtonTitles:@"确定", nil];    [alterView setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput] ;        UITextField *user = [alterView textFieldAtIndex:0 ] ;    user.keyboardType = UIKeyboardTypeAlphabet ;  //设置弹出的键盘样式        UITextField *pass = [alterView textFieldAtIndex:1] ;    pass.keyboardType = UIKeyboardTypeDefault ;        [alterView show] ;}
////实现代理协议的方法
//// 用于点击按钮是被调用,返回被调用button的索引- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{ //通过返回button索引 得到点击按钮的现实字符串 NSString *buttonName = [alertView buttonTitleAtIndex:buttonIndex]; if ([buttonName isEqualToString:@"确定" ]) { UITextField *user = [alertView textFieldAtIndex:0] ; UITextField *pass = [alertView textFieldAtIndex:1] ; NSLog(@"确定 账号=%@ 密码=%@", user.text, pass.text) ; } else if ([buttonName isEqualToString:@"取消"]) { NSLog(@"取消"); }}- (void)didReceiveMemoryWarning{ [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end

输出结果

2014-07-09 15:27:05.980 AlertView[8406:60b] 确定账号=goipc 密码=123456

2014-07-09 15:39:31.938 AlertView[8429:60b] 取消

运行的效果图