UIAlertView 解读

直接看代码：

IOS5新增：
   typedef enum {
    UIAlertViewStyleDefault = 0,
    UIAlertViewStyleSecureTextInput,
    UIAlertViewStylePlainTextInput,
    UIAlertViewStyleLoginAndPasswordInput
} UIAlertViewStyle;

- (IBAction)click3:(id)sender {
       UIAlertView *message = [[UIAlertView alloc]  
      initWithTitle:@"UIAlertViewStyleLoginAndPasswordInput" message:nil delegate:self
      cancelButtonTitle:@"Cancel" otherButtonTitles:@"Continue", nil];

     [message setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput];

    UITextField *loginFieldText = [message textFieldAtIndex:0];  //系统最多允许2个输入框，获取输入框按序号0、1来获取
    loginFieldText.placeholder = @"请输入用户名";

     //[message setNumberOfRows:2];  //实际上可以这样设置，指示SDK在5中还没暴露出来，设置之后每个按钮就是纵向排列的了

     [message show];
 }

#pragma UIAlertView Delegate

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
          if (UIAlertViewStyleLoginAndPasswordInput == alertView.alertViewStyle) {
                  UITextField *nameTextField = [alertView textFieldAtIndex:0];
                  UITextField *pwdTextField = [alertView textFieldAtIndex:1];
                   NSLog(@"name = %@, pwd = %@, buttonIndex = %d",nameTextField.text,pwdTextField.text,buttonIndex);
          }else if (UIAlertViewStylePlainTextInput == alertView.alertViewStyle) {
                  UITextField *plainTextField = [alertView textFieldAtIndex:0]; 
NSLog(@"plainTextField.text = %@, buttonIndex = %d",plainTextField.text,buttonIndex);
         }else if (UIAlertViewStyleSecureTextInput == alertView.alertViewStyle) {
                 UITextField *secureTextField = [alertView textFieldAtIndex:0]; NSLog(@"secureTextField.text = %@, buttonIndex = %d",secureTextField.text,buttonIndex); 

         }else {
              NSLog(@"buttonIndex = %d",buttonIndex);
         }
}

//这个很少用到目前起码
- (void)alertViewCancel:(UIAlertView *)alertView { NSLog(@"alertViewCancel"); }

//将要显示alertView时调用
 - (void)willPresentAlertView:(UIAlertView *)alertView{ NSLog(@"willPresentAlertView"); }

//已经显示alertView时调用
 - (void)didPresentAlertView:(UIAlertView *)alertView { NSLog(@"didPresentAlertView"); }

//将要隐藏alertView时调用
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex {        NSLog(@"willDismissWithButtonIndex"); }

//已经隐藏alertView时调用
 - (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex { NSLog(@"didDismissWithButtonIndex"); }

//每次编辑输入框时会调用
 // Called after edits in any of the default fields added by the style - (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView { return YES; }