• UIDeviceOrientation 和 UIInterfaceOrientation


    有时候,我们处理自动布局时,需要获取到屏幕旋转方向:

    以下为本人亲测:

    UIInterfaceOrientation:

    我们需要在- (void)viewDidLoad或其他方法中添加观察者,检测屏幕的旋转:

        // 监听状态栏旋转方向,即屏幕旋转
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(didChangeStatusBarOrientationNotification:)
                                                     name:UIApplicationDidChangeStatusBarOrientationNotification
                                                   object:nil];

    然后实现方法:

    // 监听的是StatusBar
    - (void)willChangeStatusBarOrientationNotification:(NSNotification *)notification {
        // 此处我们只介绍常用的三种横竖屏
        UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
        if (orientation == UIInterfaceOrientationPortrait) { // 竖屏
            NSLog(@"竖屏");
        }
        if (orientation == UIInterfaceOrientationLandscapeRight)  {// 横屏(Home键在右边)
            NSLog(@"横屏(Home键在右边");
        }
        
        if (orientation == UIInterfaceOrientationLandscapeLeft) { // 横屏(Home键在左边)
            NSLog(@"横屏(Home键在左边)");
        }
    }

    此处需要说明一下:屏幕的旋转,枚举值里面的 right/left 是以Home方法为准的!和设备旋转是相反的!

    UIDeviceOrientation:

    同样的,我们需要注册设备旋转的观察者:

        // 设置旋转
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(didChangeNotification:)
                                                     name:UIDeviceOrientationDidChangeNotification
                                                   object:nil];

    实现通知方法:

    - (void)didChangeNotification:(NSNotification *)noti {
        UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
        switch (deviceOrientation) {
            case UIDeviceOrientationPortrait:
                NSLog(@"竖屏");
                break;
                
            case UIDeviceOrientationLandscapeLeft:
                NSLog(@"横屏(Home在右边,设备向左边倒)");
                break;
                
            case UIDeviceOrientationLandscapeRight:
                NSLog(@"横屏(Home在左边,设备向右边倒)");
                break;
                
            case UIDeviceOrientationPortraitUpsideDown:
                NSLog(@"横屏(Home在右边,设备向左边倒)");
                break;
                
            case UIDeviceOrientationFaceUp:
                NSLog(@"屏幕向上");
                break;
                
            case UIDeviceOrientationFaceDown:
                NSLog(@"屏幕向下");
                break;
                
            default:
                break;
        }
    }


    注:设备旋转时,枚举值里面的方法,指的是设备倒向的方法。

    小技巧:

    1.获取屏幕当前状态栏旋转方法

    - (UIInterfaceOrientation)appInterface {
        return [UIApplication sharedApplication].statusBarOrientation;
    }

    2.强制屏幕做出旋转

    // 2对应相应的枚举值
    [[UIDevice currentDevice] setValue:@"2" forKey:@"orientation"]; 

    尊重作者劳动成果,转载请注明: 【kingdev】

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  • 原文地址:https://www.cnblogs.com/xiu619544553/p/5569269.html
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