進階AlertView運用 - 登入設計

UIAlertViewDelegate,UIAlertView,CGRect,willPresentAlertView,CGRectMake

說明：示範如何利用AlertView來製作系統登入的介面

示範：


程式碼：
CustomAlertViewViewController.h

1. #import <UIKit/UIKit.h>
   
2. 
   
3. //記得加入UIAlertViewDelete
   
4. @interface CustomAlertViewViewController :UIViewController<UIAlertViewDelegate> {
   
5. UIAlertView *myAlertView;
   
6. }
   
7. 
   
8. @property (nonatomic,retain) UIAlertView *myAlertView;
   
9. 
   
10. -(IBAction) buttonPressed:(id)sender;
    
11. 
    
12. @end

複製代碼

CustomAlertViewViewController.m

1. -(IBAction) buttonPressed:(id)sender{
   
2. myAlertView=[[UIAlertView alloc] initWithTitle:@"系統登入" message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"登入",nil];
   
3. [myAlertView show];
   
4. [myAlertView release];
   
5. 
   
6. }
   
7. 
   
8. - (void)willPresentAlertView:(UIAlertView *)alertView
   
9. {
   
10. CGRect frame = alertView.frame;
    
11. if( alertView==myAlertView )
    
12. {
    
13. frame.origin.y -= 120;
    
14. frame.size.height += 80;
    
15. alertView.frame = frame;
    
16. for( UIView *viewin alertView.subviews )
    
17. {
    
18. //列舉alertView中所有的物件
    
19. if( ![view isKindOfClass:[UILabelclass]] )
    
20. {
    
21. //若不UILable則另行處理
    
22. if (view.tag==1)
    
23. {
    
24. //處理第一個按鈕，也就是 CancelButton
    
25. CGRect btnFrame1 =CGRectMake(30, frame.size.height-65, 105, 40);
    
26. view.frame = btnFrame1;
    
27. 
    
28. } else if(view.tag==2){
    
29. //處理第二個按鈕，也就是otherButton
    
30. CGRect btnFrame2 =CGRectMake(142, frame.size.height-65, 105, 40);
    
31. view.frame = btnFrame2;
    
32. }
    
33. }
    
34. }
    
35. 
    
36. //加入自訂的label及UITextFiled
    
37. UILabel *lblaccountName=[[UILabel alloc] initWithFrame:CGRectMake( 30, 50,60, 30 )];;
    
38. lblaccountName.text=@"帳號：";
    
39. lblaccountName.backgroundColor=[UIColor clearColor];
    
40. lblaccountName.textColor=[UIColor whiteColor];
    
41. 
    
42. UITextField *accoutName = [[UITextField alloc] initWithFrame: CGRectMake( 85, 50,160, 30 )];
    
43. accoutName.placeholder = @"帳號名稱";
    
44. accoutName.borderStyle=UITextBorderStyleRoundedRect;
    
45. 
    
46. 
    
47. UILabel *lblaccountPassword=[[UILabel alloc] initWithFrame:CGRectMake( 30, 85,60, 30 )];;
    
48. lblaccountPassword.text=@"密碼：";
    
49. lblaccountPassword.backgroundColor=[UIColor clearColor];
    
50. lblaccountPassword.textColor=[UIColor whiteColor];
    
51. 
    
52. UITextField *accoutPassword = [[UITextField alloc] initWithFrame: CGRectMake( 85, 85,160, 30 )];
    
53. accoutPassword.placeholder = @"登入密碼";
    
54. accoutPassword.borderStyle=UITextBorderStyleRoundedRect;
    
55. //輸入的資料以星號顯示（密碼資料）
    
56. accoutPassword.secureTextEntry=YES;
    
57. 
    
58. [alertView addSubview:lblaccountName];
    
59. [alertView addSubview:accoutName];
    
60. [alertView addSubview:lblaccountPassword];
    
61. [alertView addSubview:accoutPassword];
    
62. }
    
63. }
    
64. 
    
65. - (void)dealloc {
    
66. [myAlertView release];
    
67. [super dealloc];
    
68. }

複製代碼