IOS使用视图控制器和视图（一）显示提示 UIAlertView

来源：互联网发布：淘宝的伴侣一个桃子编辑：程序博客网时间：2024/06/05 11:16

UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Title"message:@"Message"delegate:nilcancelButtonTitle:@"Cancel"otherButtonTitles:@"Ok", nil];[alertView show];

PS:需要创建更多按键在otherButton中添加，以nil结尾。

需要知道被按下哪一个键

首先在视图控制器头文件中添加委托：

@interface Displaying_Alerts_with_UIAlertViewViewController: UIViewController <UIAlertViewDelegate>@end

创建UIAlertView时delegate置为self。

在实现文件中添加按键响应函数

- (void) alertView:(UIAlertView *)alertViewclickedButtonAtIndex:(NSInteger)buttonIndex{NSString *buttonTitle = [alertView buttonTitleAtIndex:buttonIndex];if ([buttonTitle isEqualToString:[self yesButtonTitle]]){NSLog(@"User pressed the Yes button.");}else if ([buttonTitle isEqualToString: [self noButtonTitle]]){NSLog(@"User pressed the No button.");}}

该函数传入的是被按下的按键的索引buttonIndex，[alertView buttonTitleAtIndex:buttonIndex]获得的是被按下按键的标题。

需要输入一些信息则修改样式

typedef enum {UIAlertViewStyleDefault = 0,//默认样式UIAlertViewStyleSecureTextInput,//密码输入样式UIAlertViewStylePlainTextInput,//一个简单输入框样式UIAlertViewStyleLoginAndPasswordInput//账号密码输入样式} UIAlertViewStyle;

- (void) viewDidAppear:(BOOL)animated{[super viewDidAppear:animated];UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Credit Card Number"message:@"Please enter your credit card number:"delegate:selfcancelButtonTitle:@"Cancel"otherButtonTitles:@"Ok", nil];[alertView setAlertViewStyle:UIAlertViewStylePlainTextInput];/* Display a numerical keypad for this text field */UITextField *textField = [alertView textFieldAtIndex:0];//获得输入的信息textField.keyboardType = UIKeyboardTypeNumberPad;  //输入键盘样式[alertView show];}

上面代码效果如下：

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