2019-4-10

效果：

屏幕旋轉(zhuǎn).gif

一、targets選擇

image.png

二、根控制器（UINavigationController 或 UITabBarController）重寫

- (BOOL)shouldAutorotate {
    return YES;
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    //判斷當前頂層顯示的是 你要設置橫屏的那個控制器（FireAnimationViewController）
    if([self.selectedViewController isKindOfClass:[UINavigationController class]] && [[(UINavigationController *)[self selectedViewController] topViewController] isKindOfClass:[FireAnimationViewController class]]){
        return UIInterfaceOrientationMaskLandscape;
    }
    else{
        return UIInterfaceOrientationMaskPortrait;
    }
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return UIInterfaceOrientationPortrait;
}

三、在要設置橫屏的VC里設置

- (void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
     //首先設置UIInterfaceOrientationUnknown欺騙系統(tǒng)，避免可能出現(xiàn)  直接設置無效的情況
    [[UIDevice currentDevice] setValue:[NSNumber numberWithInt:UIInterfaceOrientationUnknown] forKey:@"orientation"];
    [[UIDevice currentDevice] setValue:[NSNumber numberWithInt:UIInterfaceOrientationLandscapeRight] forKey:@"orientation"];
}
-(void)viewDidDisappear:(BOOL)animated{
    [super viewDidDisappear:animated];
    //首先設置UIInterfaceOrientationUnknown欺騙系統(tǒng)，避免可能出現(xiàn)直接設置無效的情況
    [[UIDevice currentDevice] setValue:[NSNumber numberWithInt:UIInterfaceOrientationUnknown] forKey:@"orientation"];
    [[UIDevice currentDevice] setValue:[NSNumber numberWithInt:UIInterfaceOrientationPortrait] forKey:@"orientation"];

}

重寫view的出現(xiàn)和消失方法 改變設備的方向，主要觸發(fā)根控制器的supportedInterfaceOrientations方法 使屏幕旋轉(zhuǎn)，如果不設置，會發(fā)現(xiàn)push進來時VC沒旋轉(zhuǎn)，手動旋轉(zhuǎn)屏幕VC才會改變方向，view消失時同理，不設置則會pop出來的時候，vc和上個頁面一樣是橫屏的，手動旋轉(zhuǎn)屏幕才會變成豎屏的