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