ios 横竖屏通知

时间:2023-03-09 00:45:25
ios 横竖屏通知
  1. 屏幕切换时,会发送一个通知。只要注册一个通知:
  1. [[NSNotificationCenter defaultCenter] addObserver:self
  2. selector:@selector(doRotateAction:)
  3. name:UIDeviceOrientationDidChangeNotification
  4. object:nil];

然后在方法里做操作:

  1. -(void) doRotateAction:(NSNotification *) notification{
  2. if ([[UIDevice currentDevice] orientation]==UIInterfaceOrientationPortrait
  3. || [[UIDevice currentDevice] orientation]==UIInterfaceOrientationPortraitUpsideDown) {
  4. NSLog(@">>>portrait");
  5. }else{
  6. NSLog(@">>>landscape");
  7. }
  8. }

如果要在入口文件做切换屏幕,可以判断状态栏的方向:

    1. ////////////////////////////////////
    2. //通知委托状态栏已改变,进横竖屏操作
    3. -(void)application:(UIApplication *)application didChangeStatusBarOrientation:(UIInterfaceOrientation)oldStatusBarOrientation{
    4. //清除背景,防止上一次转屏的图像残留
    5. [imageview setBackgroundColor:[UIColor clearColor]];
    6. //以下是横竖屏4个方向的切换,注意转屏时,无论是转哪个屏。起点坐标都是在portrait方向的起点(0,0)来计算的
    7. if ([[UIDevice currentDevice] orientation]==UIInterfaceOrientationPortrait ) {
    8. NSLog(@">>>portrait"); //home键在下
    9. imageview = [[UIImageView alloc] initWithFrame:CGRectMake(0, 20, 768, 44)];
    10. imageview.backgroundColor = [UIColor redColor];
    11. [_window addSubview:imageview];
    12. }else if([[UIDevice currentDevice] orientation]==UIInterfaceOrientationPortraitUpsideDown){
    13. NSLog(@">>>PortraitUpsideDown"); //home键在上
    14. imageview = [[UIImageView alloc] initWithFrame:CGRectMake(0, 960, 768, 44)];
    15. imageview.backgroundColor = [UIColor redColor];
    16. [_window addSubview:imageview];
    17. }else if([[UIDevice currentDevice] orientation]==UIInterfaceOrientationLandscapeLeft){
    18. NSLog(@">>>LandscapeLeft"); //home键在左
    19. imageview = [[UIImageView alloc] initWithFrame:CGRectMake(20, 0, 44, 1024)];
    20. imageview.backgroundColor = [UIColor redColor];
    21. [_window addSubview:imageview];
    22. }
    23. else if([[UIDevice currentDevice] orientation]==UIInterfaceOrientationLandscapeRight){
    24. NSLog(@">>>LandscapeRight"); //home键在右
    25. imageview = [[UIImageView alloc] initWithFrame:CGRectMake(704, 0, 44, 1024)];
    26. imageview.backgroundColor = [UIColor redColor];
    27. [_window addSubview:imageview];
    28. }
    29. }