如何从 info.plist 中获取和使用 UIInterfaceOrientation 项目？

Posted 2023-03-10

【中文标题】如何从 info.plist 中获取和使用 UIInterfaceOrientation 项目？

【英文标题】：How to get and use UIInterfaceOrientation items from info.plist?

【发布时间】：2018-11-07 14:23:49

【问题描述】：

我想在 info.plist 中获取支持的界面方向的 item0。

为了得到这样的东西：

- (UIInterfaceOrientationMask)supportedInterfaceOrientations 

     NSArray *supportedOrientations = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UISupportedInterfaceOrientations"];

     return supportedOrientations[0]; 

但是我当然有一个不兼容类型错误： Incompatible pointer to integer conversion returning 'id' from a function with result type

如何解决？

【问题讨论】：

信息字典中的条目可能是一个字符串。您是否尝试过制作自己的转换函数？

【参考方案1】：

正如@Mats 在他的评论中提到的，信息字典包含支持方向的字符串值。您需要将字符串值转换为所需的UIInterfaceOrientationMask 类型。您可以使用字符串类别来执行此操作。

NSString+UIDeviceOrientation.h

static NSString *kUIInterfaceOrientationPortrait           = @"UIInterfaceOrientationPortrait";
static NSString *kUIInterfaceOrientationLandscapeLeft      = @"UIInterfaceOrientationLandscapeLeft";
static NSString *kUIInterfaceOrientationLandscapeRight     = @"UIInterfaceOrientationLandscapeRight";
static NSString *kUIInterfaceOrientationPortraitUpsideDown = @"UIInterfaceOrientationPortraitUpsideDown";

@interface NSString (UIDeviceOrientation)

- (UIInterfaceOrientationMask)deviceOrientation;

@end

NSString+UIDeviceOrientation.m

@implementation NSString (UIDeviceOrientation)

- (UIInterfaceOrientationMask)deviceOrientation 
    UIInterfaceOrientationMask mask = UIInterfaceOrientationMaskAll;

    if ([self isEqualToString:kUIInterfaceOrientationPortrait]) 
        mask = UIInterfaceOrientationMaskPortrait;
    
    else if ([self isEqualToString:kUIInterfaceOrientationLandscapeLeft]) 
        mask = UIInterfaceOrientationMaskLandscapeLeft;
    
    else if ([self isEqualToString:kUIInterfaceOrientationLandscapeRight]) 
        mask = UIInterfaceOrientationMaskLandscapeRight;
    
    else if ([self isEqualToString:kUIInterfaceOrientationPortraitUpsideDown]) 
        mask = UIInterfaceOrientationMaskPortraitUpsideDown;
    

    return mask;

Swift 版本

extension String 
private var kUIInterfaceOrientationPortrait: String 
    return "UIInterfaceOrientationPortrait"


private var kUIInterfaceOrientationLandscapeLeft: String 
    return "UIInterfaceOrientationLandscapeLeft"


private var kUIInterfaceOrientationLandscapeRight: String 
    return "UIInterfaceOrientationLandscapeRight"


private var kUIInterfaceOrientationPortraitUpsideDown: String 
    return "UIInterfaceOrientationPortraitUpsideDown"


public var deviceOrientation: UIInterfaceOrientationMask 

    switch self 
    case kUIInterfaceOrientationPortrait:
        return .portrait

    case kUIInterfaceOrientationLandscapeLeft:
        return .landscapeLeft

    case kUIInterfaceOrientationLandscapeRight:
        return .landscapeRight

    case kUIInterfaceOrientationPortraitUpsideDown:
        return .portraitUpsideDown

    default:
        return .all