通讀iOS 屏幕旋轉(zhuǎn)的實(shí)踐解析可以知道, 設(shè)置屏幕旋轉(zhuǎn)的全局權(quán)限主要有兩種方式, 且代碼設(shè)置的優(yōu)先級(jí)高于Device Orientation 屬性配置;
因此通過代碼在Appdelegate中設(shè)置屏幕旋轉(zhuǎn)的全局權(quán)限, 然后在需要使用的地方來設(shè)置是否支持屏幕旋轉(zhuǎn)即可:

一、代碼設(shè)置屏幕旋轉(zhuǎn)的全局權(quán)限 (有注釋)

Appdelegate.h

@interface AppDelegate : UIResponder <UIApplicationDelegate>

/** iPhone 是否支持轉(zhuǎn)屏 */
@property (nonatomic, assign, getter=isAllowRotate) BOOL allowRotate;

/** iPad 是否支持轉(zhuǎn)屏 */
@property (nonatomic, assign, getter=isIPadAllowRotate) BOOL iPadAllowRotate;

/** 是否不支持豎屏, 一般用于視頻的全屏播放 */
@property (nonatomic, assign, getter=isNonSupportPortraitOrientations) BOOL nonSupportPortraitOrientations;

- (void)resetAllowRotate:(NSNumber *)theAllowRotate;

- (void)resetIPadAllowRotate:(NSNumber *)theAllowRotate;

- (void)resetNonSupportPortraitOrientations:(NSNumber *)isNonSupport;

@end

Appdelegate.m

#pragma mark - Orientations

- (void)resetAllowRotate:(NSNumber *)theAllowRotate {
    _allowRotate = [theAllowRotate boolValue];
}

- (void)resetNonSupportPortraitOrientations:(NSNumber *)isNonSupport {
    _nonSupportPortraitOrientations = [isNonSupport boolValue];
}

- (void)resetIPadAllowRotate:(NSNumber *)theAllowRotate {
    [self resetAllowRotate:theAllowRotate];
    _iPadAllowRotate = [theAllowRotate boolValue];
}

// 返回需要支持的方向
// 如果我們實(shí)現(xiàn)了Appdelegate的這一方法，那么我們的App的全局旋轉(zhuǎn)設(shè)置將以這里的為準(zhǔn)
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    if (self.isAllowRotate) {
        if (self.isNonSupportPortraitOrientations) {
            return UIInterfaceOrientationMaskLandscape;
        } else {
            return UIInterfaceOrientationMaskAllButUpsideDown;
        }
    } else {
        return UIInterfaceOrientationMaskPortrait;
    }
}

當(dāng)然, 示例代碼表示在未進(jìn)行特殊處理的情況下, 僅支持UIInterfaceOrientationMaskPortrait, 也就是豎屏顯示. 按照想所需的業(yè)務(wù)場景可自行配置。
另外, 當(dāng)系統(tǒng)屏幕旋轉(zhuǎn)開關(guān)鎖定時(shí), 不論supportedInterfaceOrientationsForWindow支持那些方向, 項(xiàng)目都不會(huì)跟隨手機(jī)感應(yīng)器旋轉(zhuǎn)。

二、需要的位置設(shè)置是否支持橫豎屏幕

以Appdelegate.m示例代碼為例, 想進(jìn)入一個(gè)橫屏的視頻播放界面, 就需要在進(jìn)入之前設(shè)置屏幕支持旋轉(zhuǎn), 退出視頻之后再取消支持屏幕旋轉(zhuǎn)。
這里是權(quán)限設(shè)置的一個(gè)封裝方法:

- (void)setResetAllowRotate:(BOOL)allowRotate {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wundeclared-selector"
        if ([[UIApplication sharedApplication].delegate respondsToSelector:@selector(resetAllowRotate:)]) {
            [[UIApplication sharedApplication].delegate performSelector:@selector(resetAllowRotate:) withObject:[NSNumber numberWithBool:allowRotate]];
        }
#pragma clang diagnostic pop
}

2.1 在進(jìn)入橫屏頁面之前調(diào)用:

[self setResetAllowRotate:YES];

2.2 在退出橫屏頁面之后調(diào)用:

[self setResetAllowRotate:NO];

• 針對(duì)預(yù)處理指令的意義有不理解的, 可以參考iOS #pragma & #pragma clang diagnostic

三、代碼在運(yùn)行iPad上過程中, supportedInterfaceOrientationsForWindow 不調(diào)用的問題.

fix: 打開Device Orientation 屬性配置, 勾選Requires full screen選項(xiàng)即可。

Device Orientation 屬性配置:

項(xiàng)目 -> TARGET -> General -> Deployment Info

默認(rèn)的勾選配置

開啟Requires full screen

• Requires full screen 勾選, 代表著iPad 需要全屏幕展示, 也就代表著存在橫豎屏幕的情況, window尺寸無非是橫豎屏幕變換。
• Requires full screen 未勾選, 代表著iPad 不需要全屏幕展示, 也就代表著不存在橫豎屏幕的情況, window尺寸可以隨便變換, 只有寬和高的定義, 一般用來支持iPad項(xiàng)目分屏處理。

結(jié)語

路漫漫其修遠(yuǎn)兮，吾將上下而求索~

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