iOS screen notifications

1. A notification is sent when the screen is switched. Just register a notification:

[Java]View Plaincopy

2. [[Nsnotificationcenter Defaultcenter] Addobserver:self
4. Selector:@selector (dorotateaction:)
6. Name:uideviceorientationdidchangenotification
8. Object:nil];

Then do the operation in the method:

[Java]View Plaincopy

1. -(void)  dorotateaction: (nsnotification  *)  notification{  
2.     if  ( [[uidevice currentdevice] orientation]==uiinterfaceorientationportrait   
3.         | |  [[uidevice currentdevice] orientation]==uiinterfaceorientationportraitupsidedown)  {    
4.         nslog (@
5.     }else{    
6.         nslog (@
7.     }  
8. }  

If you want to make a switch screen in the portal file, you can determine the orientation of the status bar:

[Java]View Plaincopy

2. ////////////////////////////////////
4. Notification delegate status bar has changed, into the screen operation
6. -(void) Application: (UIApplication *) application didchangestatusbarorientation: (uiinterfaceorientation) oldstatusbarorientation{
8. //clear background to prevent image residue from last screen turn
10. [ImageView Setbackgroundcolor:[uicolor Clearcolor];
12. //The following is a 4-direction switch between the horizontal and vertical screen, pay attention to turn the screen, regardless of which screen to turn. The starting coordinates are calculated from the starting point of the portrait direction (0,0) .
14. if ([[[Uidevice Currentdevice] orientation]==uiinterfaceorientationportrait) {
16. NSLog (@">>>portrait"); //home key in the next
18. ImageView = [[Uiimageview alloc] Initwithframe:cgrectmake (0, 768, 44)];
20. Imageview.backgroundcolor = [Uicolor Redcolor];
22. [_window Addsubview:imageview];
24. }Else if ([[[Uidevice Currentdevice] orientation]==uiinterfaceorientationportraitupsidedown) {
26. NSLog (@">>>portraitupsidedown"); //home key on the
28. ImageView = [[Uiimageview alloc] Initwithframe:cgrectmake (0, 960, 768, 44)];
30. Imageview.backgroundcolor = [Uicolor Redcolor];
32. [_window Addsubview:imageview];
34. }Else if ([[[Uidevice Currentdevice] orientation]==uiinterfaceorientationlandscapeleft) {
36. NSLog (@">>>landscapeleft"); //home key in left
38. ImageView = [[Uiimageview alloc] Initwithframe:cgrectmake (0, 1024)];
40. Imageview.backgroundcolor = [Uicolor Redcolor];
42. [_window Addsubview:imageview];
44. }
46. Else if ([[Uidevice Currentdevice] orientation]==uiinterfaceorientationlandscaperight) {
48. NSLog (@">>>landscaperight"); //home key on right
50. ImageView = [[Uiimageview alloc] Initwithframe:cgrectmake (704, 0, 1024)];
52. Imageview.backgroundcolor = [Uicolor Redcolor];
54. [_window Addsubview:imageview];
56. }
60. }

iOS screen notifications