iOS应用方向设置-优快云博客

本文介绍了一个iOS应用中如何使用AppDelegate来设置和管理应用的方向。通过重写supportedInterfaceOrientationsForWindow方法，可以指定应用支持的设备方向。此外，通过setOrientationMask方法，可以在运行时动态更改应用的方向。

appdelegate.m

+ (AppDelegate *)sharedInstance {
    return (AppDelegate *)[UIApplication sharedApplication].delegate;
}

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    return _orientationMask;
}

- (void)setOrientationMask:(UIInterfaceOrientationMask)orientationMask {
    if (_orientationMask == orientationMask) {
        return;
    }
    _orientationMask = orientationMask;
    
    UIDeviceOrientation orient = UIDeviceOrientationUnknown;
    
    if (UIInterfaceOrientationMaskLandscape & orientationMask) {
        switch ([UIDevice currentDevice].orientation) {
            case UIDeviceOrientationLandscapeLeft:
                orient = UIDeviceOrientationLandscapeLeft;
                break;
            case UIDeviceOrientationLandscapeRight:
                orient = UIDeviceOrientationLandscapeRight;
                break;
            default:
                orient = UIDeviceOrientationLandscapeRight;
                break;
        }
    } else if (UIInterfaceOrientationMaskPortrait & orientationMask) {
        orient = UIDeviceOrientationPortrait;
    } else if (UIInterfaceOrientationMaskPortraitUpsideDown & orientationMask) {
        orient = UIDeviceOrientationPortraitUpsideDown;
    }
    
    [[UIDevice currentDevice] setValue:@(UIDeviceOrientationUnknown) forKey:@"orientation"];
    [[UIDevice currentDevice] setValue:@(orient) forKey:@"orientation"];
    [UIViewController attemptRotationToDeviceOrientation];
}

appdelegate.h

@interface AppDelegate : UIResponder <UIApplicationDelegate>

+ (AppDelegate *)sharedInstance;

@property (strong, nonatomic) UIWindow *window;

@property (nonatomic, assign) UIInterfaceOrientationMask orientationMask;

@end

调用:

[AppDelegate sharedInstance].orientationMask = UIInterfaceOrientationMaskPortrait;

不同界面强制横竖屏幕控制