When I rotated the simulator, there are many black blocks around UIWindow

Question

How to get the black blocks disappear?

And after the rotation, the black blocks disappear.

AppDelegate Source File:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    UIStoryboard *mainStoryBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *viewController = [mainStoryBoard instantiateViewControllerWithIdentifier:@"ViewController"];

    self.window.rootViewController = viewController;

    bar = [KodUserCenterBar instance];

    [self.window makeKeyAndVisible];
    return YES;
}

Header File:

@interface KodUserCenterBar : UIWindow

/**获取单例
 */
+ (instancetype)instance;

/**显示工具栏
 */
+ (void)show;

/**隐藏工具栏
 */
+ (void)hide;

/**显示功能视图
 */
+ (void)showFunctionView;

/**隐藏功能视图
 */
+ (void)hideFunctionView;

@end

Source File:

#define WIDTH self.frame.size.width
#define HEIGHT self.frame.size.height



#define kScreenWidth [UIScreen mainScreen].bounds.size.width
 #define kScreenHeight [UIScreen mainScreen].bounds.size.height
 #define kBarWidth 200
 #define kBarImageViewTag 100
 #define kBarItemGap 5
 #define degreesToRadian(x) (M_PI * (x) / 180.0)

 @interface KodUserCenterBarFunctionItemObject : NSObject

 @property (nonatomic, copy) NSString *title;
 @property (nonatomic, assign) NSUInteger indexOfTabBar;
 @property (nonatomic, copy) NSString *imageName;

 + (instancetype)objectWithTitle:(NSString *)title indexOfTabBar:(NSUInteger)index imageName:(NSString *)imageName;

@end

@implementation KodUserCenterBarFunctionItemObject

+ (instancetype)objectWithTitle:(NSString *)title indexOfTabBar:(NSUInteger)index imageName:(NSString *)imageName
{
    KodUserCenterBarFunctionItemObject *obj = [KodUserCenterBarFunctionItemObject new];
    if (obj) {
        obj.title = title;
        obj.indexOfTabBar = index;
        obj.imageName = imageName;
    }
    return obj;
}

@end


@interface KodUserCenterBar()
{
    UIPanGestureRecognizer *pan;
    UIViewController *_rootVC;
}

@property (nonatomic, copy) NSArray *itemsOfBar;
@property (nonatomic, assign) CGFloat initWidth;
@property (atomic, strong) UIButton *button;

@end

static KodUserCenterBar *static_instance = nil;
static BOOL isShowMenu = NO;

@implementation KodUserCenterBar

+ (instancetype)instance
{
    if (static_instance == nil) {
        static_instance = [KodUserCenterBar new];
        [static_instance addTopButton];
    }
    return static_instance;
}

+ (void)show
{
    [KodUserCenterBar instance].hidden = NO;
}

+ (void)hide
{
    [KodUserCenterBar instance].hidden = YES;
}

+ (void)showFunctionView
{
    if (!isShowMenu) {
        [[KodUserCenterBar instance] clickBar:nil];
    }
}

+ (void)hideFunctionView
{
    if (isShowMenu) {
        [[KodUserCenterBar instance] clickBar:nil];
    }
}

- (instancetype)init
{
    if (self = [super init]) {
        self.backgroundColor = [UIColor clearColor];
        self.windowLevel = UIWindowLevelAlert;
        self.userInteractionEnabled = YES;
        [self makeKeyAndVisible];
        self.sd_x = 0;
        self.sd_center_y = [UIScreen mainScreen].bounds.size.height / 2;

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onDeviceOrientationChange) name:UIDeviceOrientationDidChangeNotification object:nil];
    }
    return self;
}

- (NSArray *)itemsOfBar
{
    if (_itemsOfBar == nil) {
        KodUserCenterBarFunctionItemObject *item1 = [KodUserCenterBarFunctionItemObject objectWithTitle:@"个人中心" indexOfTabBar:0 imageName:@"tb3_toolbaruser"];

        KodUserCenterBarFunctionItemObject *item2 = [KodUserCenterBarFunctionItemObject objectWithTitle:@"游戏礼包" indexOfTabBar:1 imageName:@"tb3_toolbargame"];

        KodUserCenterBarFunctionItemObject *item3 = [KodUserCenterBarFunctionItemObject objectWithTitle:@"系统公告" indexOfTabBar:2 imageName:@"tb3_toolbarmsg"];

        KodUserCenterBarFunctionItemObject *item4 = [KodUserCenterBarFunctionItemObject objectWithTitle:@"游戏论坛" indexOfTabBar:3 imageName:@"tb3_toolbarbbs"];

        NSArray *data = @[item1, item2, item3, item4];
        _itemsOfBar = [NSArray arrayWithArray:data];
    }

    return _itemsOfBar;
}

- (void)onDeviceOrientationChange
{
    UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;

    if (orientation == UIDeviceOrientationPortrait || orientation == UIDeviceOrientationPortraitUpsideDown) {
        NSLog(@"is portrait");
        NSLog(@"width = %f, height = %f", kScreenWidth, kScreenHeight);
        [self adjustWindowPosition];
        self.sd_center_y = kScreenHeight / 2;
    }
    else if (orientation == UIDeviceOrientationLandscapeLeft || orientation == UIDeviceOrientationLandscapeRight) {
        NSLog(@"is landscape");
        NSLog(@"width = %f, height = %f", kScreenWidth, kScreenHeight);
        [self adjustWindowPosition];
        self.sd_center_y = kScreenHeight / 2;
    }
}

- (void)addTopButton
{
    pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(dragBar:)];
    pan.delaysTouchesBegan = NO;
    [self addGestureRecognizer:pan];

    UIViewController *vc = [[KodBasicViewController alloc] init];
    vc.view.backgroundColor = [UIColor clearColor];
    self.rootViewController = vc;
    CGSize size = [UIImage imageNamed:@"tb3_assi_nor"].size;
    self.sd_width = size.width;
    self.sd_height = size.height;
    self.initWidth = size.width;

    _button = [[UIButton alloc] init];
    [_button setBackgroundImage:[UIImage imageNamed:@"tb3_assi_nor"] forState:UIControlStateNormal];
    [_button setBackgroundImage:[UIImage imageNamed:@"tb3_assi_pre"] forState:UIControlStateHighlighted];
    [_button setBackgroundImage:[UIImage imageNamed:@"tb3_assi_pre"] forState:UIControlStateSelected];
    _button.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
    [_button addTarget:self action:@selector(clickBar:) forControlEvents:UIControlEventTouchUpInside];
    _button.userInteractionEnabled = YES;
    _button.selected = NO;
    [_button becomeFirstResponder];
    [vc.view addSubview:_button];
}

- (void)clickBar:(id)button
{
    NSTimeInterval interval = 0.2;
    __weak typeof(_button) weakButton = _button;

    isShowMenu = !isShowMenu;
    pan.enabled = !isShowMenu;

    if (self.sd_center_x > kScreenWidth / 2) {
        [UIView animateWithDuration:interval animations:^{
            self.sd_x = kScreenWidth;
        } completion:^(BOOL finished) {
            if (isShowMenu) {
                self.sd_width = kBarWidth + self.initWidth;
                _button.sd_right_x = self.sd_width;

                UIImage *image = [UIImage imageNamed:@"tb3_assi_bor_right"];
                image = [image resizableImageWithCapInsets:UIEdgeInsetsMake(1, 30, 1, 0)];
                UIImageView *rightImageView = [[UIImageView alloc] initWithImage:image];
                rightImageView.image = image;
                rightImageView.sd_width = kBarWidth;
                rightImageView.sd_right_x = _button.sd_x;
                rightImageView.sd_center_y = _button.sd_center_y;
                rightImageView.tag = kBarImageViewTag;
                rightImageView.userInteractionEnabled = YES;
                [self.rootViewController.view addSubview:rightImageView];
                self.sd_x = kScreenWidth;

                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_act_right"] forState:UIControlStateNormal];
                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_act_pre_right"] forState:UIControlStateSelected];
                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_act_pre_right"] forState:UIControlStateHighlighted];
                [self addFunctionItems:NO];
            }
            else {
                self.sd_width = self.initWidth;
                _button.sd_right_x = self.sd_width;
                UIView *contentView = [self.rootViewController.view viewWithTag:kBarImageViewTag];
                [contentView removeFromSuperview];

                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_nor"] forState:UIControlStateNormal];
                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_pre"] forState:UIControlStateSelected];
                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_pre"] forState:UIControlStateHighlighted];
            }

            [UIView animateWithDuration:interval animations:^{
                self.sd_right_x = kScreenWidth;
            }];
        }];
    }
    else {
        [UIView animateWithDuration:interval animations:^{
            self.sd_right_x = 0;
        } completion:^(BOOL finished) {
            if (isShowMenu) {
                self.sd_width = kBarWidth + self.initWidth;

                UIImage *image = [UIImage imageNamed:@"tb3_assi_bor_left"];
                image = [image resizableImageWithCapInsets:UIEdgeInsetsMake(1, 0, 1, 30)];
                UIImageView *leftImageView = [[UIImageView alloc] initWithImage:image];
                leftImageView.image = image;
                leftImageView.sd_width = kBarWidth;
                leftImageView.sd_x = _button.sd_right_x;
                leftImageView.sd_center_y = _button.sd_center_y;
                leftImageView.tag = kBarImageViewTag;
                leftImageView.userInteractionEnabled = YES;
                [self.rootViewController.view addSubview:leftImageView];
                self.sd_right_x = 0;

                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_act_left"] forState:UIControlStateNormal];
                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_act_pre_left"] forState:UIControlStateSelected];
                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_act_pre_left"] forState:UIControlStateHighlighted];

                [self addFunctionItems:YES];
            }
            else {
                self.sd_width = self.initWidth;
                UIView *contentView = [self.rootViewController.view viewWithTag:kBarImageViewTag];
                [contentView removeFromSuperview];

                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_nor"] forState:UIControlStateNormal];
                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_pre"] forState:UIControlStateSelected];
                [weakButton setBackgroundImage:[UIImage imageNamed:@"tb3_assi_pre"] forState:UIControlStateHighlighted];
            }

            [UIView animateWithDuration:interval animations:^{
                self.sd_x = 0;
            }];
        }];
    }
}

- (void)addFunctionItems:(BOOL)isLeft
{
    UIView *bgView = [self.rootViewController.view viewWithTag:kBarImageViewTag];
    if (bgView) {
        [self.itemsOfBar enumerateObjectsUsingBlock:^(KodUserCenterBarFunctionItemObject *obj, NSUInteger idx, BOOL * _Nonnull stop) {
            if ([bgView viewWithTag:idx] == nil) {
                KodFrameTabBarItem *item = [[KodFrameTabBarItem alloc] init];
                item.tag = idx;
                item.title = obj.title;
                item.imageName = obj.imageName;
                item.sd_width = (bgView.sd_width - _itemsOfBar.count * kBarItemGap - 10) / _itemsOfBar.count;
                item.sd_height = bgView.sd_height;
                item.sd_center_y = bgView.sd_height / 2;
                item.sd_center_x = kBarItemGap + idx * (item.sd_width + kBarItemGap) + item.sd_width / 2;
                item.sd_center_x += isLeft ? 0 : item.sd_width / 4;
                [item addTarget:self action:@selector(clickItem:) forControlEvents:UIControlEventTouchUpInside];

                [bgView addSubview:item];
            }
        }];
    }
}

- (void)clickItem:(id)sender
{
    [KodNavigationView showWithIndex:0];
    [[UIApplication sharedApplication].keyWindow addSubview:[KodNavigationView instance]];
}

- (void)adjustWindowPosition
{
    if (self.sd_center_x < kScreenWidth / 2) {
        self.sd_x = 0;
    }
    else {
        self.sd_right_x = kScreenWidth;
    }
}

- (void)dragBar:(UIPanGestureRecognizer *)p
{
    CGPoint panPoint = [p locationInView:[[UIApplication sharedApplication] keyWindow]];

    if (p.state == UIGestureRecognizerStateBegan) {
        if (_button) {
            _button.selected = YES;
        }
    }
    else if(p.state == UIGestureRecognizerStateChanged) {
        self.center = CGPointMake(panPoint.x, panPoint.y);
        if (panPoint.x < WIDTH / 2) {
            self.sd_x = 0;
        }
        else if (panPoint.x > kScreenWidth - WIDTH / 2) {
            self.sd_right_x = kScreenWidth;
        }

        if (panPoint.y < HEIGHT / 2) {
            self.sd_y = 0;
        }
        else if (panPoint.y > kScreenHeight - HEIGHT / 2) {
            self.sd_bottom_y = kScreenHeight;
        }
    }
    else if(p.state == UIGestureRecognizerStateEnded) {
        if(panPoint.x <= kScreenWidth / 2) {
            [UIView animateWithDuration:0.2 animations:^{
                self.sd_x = 0;
            } completion:nil];
        }
        else {
            [UIView animateWithDuration:0.2 animations:^{
                self.sd_right_x = kScreenWidth;
            } completion:nil];
        }

        if (_button) {
            _button.selected = NO;
        }
    }
}

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

@end

Root ViewController

Source File Of Root ViewController:

@interface KodBasicViewController ()

@end

@implementation KodBasicViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskAll;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationPortrait;
}



- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    UIWindow *window = self.view.window;
    [window bringSubviewToFront:window.rootViewController.view];
}

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
    UIWindow *window = self.view.window;
    [window bringSubviewToFront:window.rootViewController.view];
}

@end

Answer 1

Here is my solution to this problem:

window.layer.masksToBounds = true

Answer 2

It's the default background colour of UIWindow instance, and while your root view is doing rotation, those uncovered parts will be shown as black block as you said.

You can just set your desired background colour for your window (or make your root view's frame big enough to cover whole window while doing rotation, not recommended):

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  ...
  [self.window setBackgroundColor:[UIColor lightGrayColor]];
  [self.window makeKeyAndVisible];
  return YES;
}