iOS 基础小结 常用控件之二

一，UIAlertView警告框

（1）   UIAlertView * alert = [[UIAlertViewalloc]

                           initWithTitle:@"Notice"message:@"the alert"delegate:selfcancelButtonTitle:@"OK"otherButtonTitles:@"Options1",@"Options2",nil];

    [alert show];

很简单，上述方法可以产生并显示一个警告框。警告框上的button的内容就是设置ButtonTitle。关键是警告框给提供的协议方法。

（2）

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

这个方法是当用户点击警告框中的某个按键时会触发该方法，buttonIndex代表按钮的索引，从0开始

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex

这个方法是完全隐藏警示框出来之后会触发

- (void)alertViewCancel:(UIAlertView *)alertView

这个是在警告框被取消时触发

- (void) alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex

这个方法是在将要显示隐藏的时候触发

- (void)willPresentAlertView:(UIAlertView *)alertView

这个是警告框将要显示出来的时候触发

-(void) didPresentAlertView:(UIAlertView *)alertView

这个是警告框完全显示出来的时候触发

（3）该控件有个属性，actionSheetStyle，用来设置风格，比如可以使其带有一个输入框，带有密码输入框等，举个栗子，输入用户名和密码

- (IBAction)clicked:(id)sender {

    UIAlertView * alert = [[UIAlertViewalloc]

                           initWithTitle:@"Log on"message:@"please input the user name and the password"delegate:selfcancelButtonTitle:@"Cancle"otherButtonTitles:@"OK",nil];

    alert.alertViewStyle =UIAlertViewStyleLoginAndPasswordInput;

    [alert textFieldAtIndex:1].keyboardType =UIKeyboardTypeNumberPad;

    [alert show];

}

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

    if (buttonIndex == 1) {

        UITextField * nameField = [alertViewtextFieldAtIndex:0];

        UITextField * passField = [alertViewtextFieldAtIndex:1];

        

        NSString * msg = [NSStringstringWithFormat:@"you have input the user name : %@ and the password : %@",nameField.text,passField.text];

        UIAlertView * alert = [[UIAlertViewalloc]initWithTitle:@"notice"message:msgdelegate:nilcancelButtonTitle:@"OK"otherButtonTitles:nil];

        [alert show];

    }

}

- (void) willPresentAlertView:(UIAlertView *)alertView{

    for (UIView * viewin alertView.subviews) {

        if ([view isKindOfClass:[UILabelclass]]) {

            UILabel * lable = (UILabel *)view;

            lable.textAlignment =UITextAlignmentLeft;

        }

    }

}

二，UIActionSheet

这个控件跟Alert非常之像，写一点简单的使用就可以知道了

- (IBAction)clicked:(id)sender {  

    UIActionSheet * sheet = [[UIActionSheetalloc]initWithTitle:@"make sure to delete"delegate:selfcancelButtonTitle:@"Cancle"destructiveButtonTitle:@"OK"otherButtonTitles:@"Options1",@"Options2",nil];

    sheet.actionSheetStyle =UIActionSheetStyleAutomatic;

    [sheet showInView:self.view];

}

- (void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{

    NSString * msg = [NSStringstringWithFormat:@"you have clicked the %ld button",(long)buttonIndex];

    UIAlertView * alert = [[UIAlertViewalloc]initWithTitle:@"notice"message:msg delegate:nilcancelButtonTitle:@"OK"otherButtonTitles: nil];

    [alert show];

}