說明：示范如何利用AlertView來制作系統登入的介面



程式碼：
CustomAlertViewViewController.h

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    #import <UIKit/UIKit.h>



//記得加入UIAlertViewDelete

@interface CustomAlertViewViewController : UIViewController<UIAlertViewDelegate> {

    UIAlertView *myAlertView;

}



@property (nonatomic,retain) UIAlertView *myAlertView;



-(IBAction) buttonPressed:(id)sender;



@end



CustomAlertViewViewController.m 


-(IBAction) buttonPressed:(id)sender{

    myAlertView=[[UIAlertView alloc] initWithTitle:@"系統登入" message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"登入",nil];

    [myAlertView show];

    [myAlertView release];

    

}



- (void)willPresentAlertView:(UIAlertView *)alertView

{

        CGRect frame = alertView.frame;

        if( alertView==myAlertView )

        {

                frame.origin.y -= 120;

                frame.size.height += 80;

                alertView.frame = frame;

                for( UIView * view in alertView.subviews )

                {

            //列舉alertView中所有的物件

                        if( ![view isKindOfClass:[UILabel class]] )

                        {

            //若不UILable則另行處理

                if (view.tag==1)

                {

                //處理第一個按鈕，也就是 CancelButton

                           CGRect btnFrame1 =CGRectMake(30, frame.size.height-65, 105, 40);

                                view.frame = btnFrame1;

               

                } else if  (view.tag==2){

                //處理第二個按鈕，也就是otherButton    

                    CGRect btnFrame2 =CGRectMake(142, frame.size.height-65, 105, 40);

                    view.frame = btnFrame2;               

                }

                        }

                }

                

        //加入自訂的label及UITextFiled

        UILabel *lblaccountName=[[UILabel alloc] initWithFrame:CGRectMake( 30, 50,60, 30 )];;

        lblaccountName.text=@"帳號：";

        lblaccountName.backgroundColor=[UIColor clearColor];

        lblaccountName.textColor=[UIColor whiteColor];

        

        UITextField *accoutName = [[UITextField alloc] initWithFrame: CGRectMake( 85, 50,160, 30 )];   

        accoutName.placeholder = @"帳號名稱";

        accoutName.borderStyle=UITextBorderStyleRoundedRect;

        

        

        UILabel *lblaccountPassword=[[UILabel alloc] initWithFrame:CGRectMake( 30, 85,60, 30 )];;

        lblaccountPassword.text=@"密碼：";

        lblaccountPassword.backgroundColor=[UIColor clearColor];

        lblaccountPassword.textColor=[UIColor whiteColor];

        

        UITextField *accoutPassword = [[UITextField alloc] initWithFrame: CGRectMake( 85, 85,160, 30 )];   

        accoutPassword.placeholder = @"登入密碼";

        accoutPassword.borderStyle=UITextBorderStyleRoundedRect;

        //輸入的資料以星號顯示（密碼資料）

        accoutPassword.secureTextEntry=YES;

        

             [alertView addSubview:lblaccountName];

                [alertView addSubview:accoutName];         

        [alertView addSubview:lblaccountPassword];

                [alertView addSubview:accoutPassword];

        }

}



- (void)dealloc {

    [myAlertView release];

    [super dealloc];

}

  

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進階AlertView運用 - 登入設計