屏幕强转实现

不念不忘少年蓝@ 2022-09-24 06:20 160阅读 0赞

#import "ViewController.h"
    
    @interface ViewController ()
    
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        
        
    }
    
    - (void)viewWillAppear:(BOOL)animated{
    
        [super viewWillAppear:animated];
        
        [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
        
        [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(orientationChange) name:UIDeviceOrientationDidChangeNotification object:nil];
    }
    
    
    
    - (void)viewDidDisappear:(BOOL)animated{
        [super viewDidDisappear:animated];
        
        
        [[NSNotificationCenter defaultCenter]removeObserver:self];
    
    }
    
    
    
    
    - (IBAction)orientationAction:(id)sender {
        
        UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;
        UIInterfaceOrientation interfaceOrientation = (UIInterfaceOrientation)orientation;
        switch (interfaceOrientation) {
            case UIInterfaceOrientationPortraitUpsideDown:{ // 电池栏在下
                
                [self interfaceOrientation:UIInterfaceOrientationLandscapeRight];
                
                break;
            }
            case UIInterfaceOrientationLandscapeLeft:{ // 电池栏在右
                
                [self interfaceOrientation:UIInterfaceOrientationPortrait];
                
                break;
            }
                
            case UIInterfaceOrientationLandscapeRight:{ // 电池栏在左
                
                [self interfaceOrientation:UIInterfaceOrientationPortrait];
                
                break;
            }
            case UIInterfaceOrientationPortrait:{ // 电池栏在上
                
                [self interfaceOrientation:UIInterfaceOrientationLandscapeRight];
                
                break;
            }
                
            default:
                break;
        }
    }
    
    
    
    // 强制转屏相关
    
    - (void)interfaceOrientation:(UIInterfaceOrientation)orientation{
    
        // arc下
        if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
            SEL selector = NSSelectorFromString(@"setOrientation:");
            NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
            [invocation setSelector:selector];
            [invocation setTarget:[UIDevice currentDevice]];
            int val = orientation;
            [invocation setArgument:&val atIndex:2];
            [invocation invoke];
        }
    }
    
    
    // 开始转屏---------
    
    - (void)orientationChange{
        
        
    }
    
    @end