iOS开发监听屏幕的旋转

#import "ViewController.h"


@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
    selector:@selector(onDeviceOrientationChange:)
        name:UIDeviceOrientationDidChangeNotification
      object:nil];
}

/**
 *  旋转屏幕通知
 */
- (void)onDeviceOrientationChange:(NSNotification *)notification {

    UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;
    UIInterfaceOrientation interfaceOrientation = (UIInterfaceOrientation)orientation;
    switch (interfaceOrientation) {
        case UIInterfaceOrientationPortraitUpsideDown:{
            NSLog(@"第3个旋转方向---电池栏在下");
        }
            break;
        case UIInterfaceOrientationPortrait:{
            NSLog(@"第0个旋转方向---电池栏在上");
        }
            break;
        case UIInterfaceOrientationLandscapeLeft:{
            NSLog(@"第2个旋转方向---电池栏在左");
        }
            break;
        case UIInterfaceOrientationLandscapeRight:{
            NSLog(@"第1个旋转方向---电池栏在右");
        }
            break;
        default:
            break;
    }
}

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

@end