Method for presenting overlapping views.

Pickers/AbstractActionSheetPicker.m

@@ -30,7 +30,7 @@
 #import <objc/message.h>
 #import <sys/utsname.h>
 
-BOOL isIPhone4()
+CG_INLINE BOOL isIPhone4()
 {
     struct utsname systemInfo;
     uname(&systemInfo);

Pickers/SWActionSheet.h

@@ -6,8 +6,6 @@
 
 
 @interface SWActionSheet : UIView
-@property(nonatomic, strong) UIView *origin;
-
 @property(nonatomic, strong) UIView *bgView;
 
 - (void)dismissWithClickedButtonIndex:(int)i animated:(BOOL)animated;

Pickers/SWActionSheet.m

@@ -5,62 +5,114 @@
 #import "SWActionSheet.h"
 
 
+static UIWindow *SWActionSheetWindow = nil;
+
 static const float delay = 0.f;
 
 static const float duration = .3f;
 
 static const enum UIViewAnimationOptions options = UIViewAnimationOptionCurveEaseIn;
 
+
+@interface SWActionSheetVC : UIViewController
+
+@property (nonatomic, retain) SWActionSheet *actionSheet;
+
+@end
+
+
+@interface SWActionSheet ()
+
+@property (nonatomic, assign) BOOL presented;
+
+- (void)configureFrameForBounds:(CGRect)bounds;
+- (void)showInContainerViewAnimated:(BOOL)animated;
+
+@end
+
+
 @implementation SWActionSheet
 {
     UIView *view;
-
-    UIView *_origin;
     UIView *_bgView;
 }
+
 - (void)dismissWithClickedButtonIndex:(int)i animated:(BOOL)animated
 {
     CGPoint fadeOutToPoint = CGPointMake(view.center.x,
             self.center.y + CGRectGetHeight(view.frame));
+    // Window of app
+    UIWindow *appWindow = [UIApplication sharedApplication].windows.firstObject;
+    // Actions
+    void (^actions)() = ^{
+        self.center = fadeOutToPoint;
+        self.backgroundColor = [UIColor colorWithWhite:0.f alpha:0.0f];
+    };
+    void (^completion)(BOOL) = ^(BOOL finished) {
+        if (![appWindow isKeyWindow])
+            [appWindow makeKeyAndVisible];
+        [SWActionSheet destroyWindow];
+        [self removeFromSuperview];
+    };
+    // Do actions animated or not
+    if (animated) {
+        [UIView animateWithDuration:duration delay:delay options:options animations:actions completion:completion];
+    } else {
+        actions();
+        completion(YES);
+    }
+    self.presented = NO;
+}
 
-    [UIView animateWithDuration:duration delay:delay
-                        options:options animations:^{
-         self.center = fadeOutToPoint;
-         self.backgroundColor = [UIColor colorWithWhite:0.f alpha:0.0f];
-     }
-                     completion:^(BOOL finished) {
-                         [self removeFromSuperview];
-                     }];
++ (void)destroyWindow
+{
+    if (SWActionSheetWindow)
+    {
+        [SWActionSheet actionSheetContainer].actionSheet = nil;
+        SWActionSheetWindow.hidden = YES;
+        if ([SWActionSheetWindow isKeyWindow])
+            [SWActionSheetWindow resignFirstResponder];
+        SWActionSheetWindow = nil;
+    }
 }
 
-- (instancetype)initWithView:(UIView *)aView
++ (UIWindow *)window
 {
-    UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
-    _origin = (keyWindow.rootViewController ? keyWindow.rootViewController.view : keyWindow);
+    return (SWActionSheetWindow ?: (SWActionSheetWindow = ({
+        UIWindow *window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
+        window.windowLevel = UIWindowLevelAlert;
+        window.backgroundColor = [UIColor clearColor];
+        window.rootViewController = [SWActionSheetVC new];
+        window;
+    })));
+}
+
++ (SWActionSheetVC *)actionSheetContainer
+{
+    return (SWActionSheetVC *) [SWActionSheet window].rootViewController;
+}
 
-    CGRect rect = [self getRectForPicker:aView];
-    self = [super initWithFrame:rect];
-    if ( self )
+- (instancetype)initWithView:(UIView *)aView
+{
+    if ((self = [super init]))
     {
         view = aView;
-        CGRect cgRect = CGRectMake(view.bounds.origin.x, _origin.bounds.size.height, view.bounds.size.width, view.bounds.size.height);
-        view.frame = cgRect;
         self.backgroundColor = [UIColor colorWithWhite:0.f alpha:0.0f];
-        _bgView = [[UIView alloc] initWithFrame:view.frame];
+        _bgView = [UIView new];
         _bgView.backgroundColor = [UIColor whiteColor];
         [self addSubview:_bgView];
-        [self addSubview:aView];
-
+        [self addSubview:view];
     }
-
     return self;
 }
 
-- (CGRect)getRectForPicker:(UIView *)aView
+- (void)configureFrameForBounds:(CGRect)bounds
 {
-    CGRect rect;
-        rect = CGRectMake(_origin.bounds.origin.x, _origin.bounds.origin.y, _origin.bounds.size.width, _origin.bounds.size.height + aView.bounds.size.height);
-    return rect;
+    self.frame = CGRectMake(bounds.origin.x, bounds.origin.y, bounds.size.width, bounds.size.height + view.bounds.size.height);
+    view.frame = CGRectMake(view.bounds.origin.x, bounds.size.height, view.bounds.size.width, view.bounds.size.height);
+    view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
+    _bgView.frame = view.frame;
+    _bgView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
 }
 
 - (void)showFromBarButtonItem:(UIBarButtonItem *)item animated:(BOOL)animated
@@ -70,25 +122,70 @@ - (void)showFromBarButtonItem:(UIBarButtonItem *)item animated:(BOOL)animated
 
 - (void)showInContainerView
 {
-    [_origin addSubview:self];
+    // Make sheet window visible and active
+    UIWindow *sheetWindow = [SWActionSheet window];
+    if (![sheetWindow isKeyWindow])
+        [sheetWindow makeKeyAndVisible];
+    sheetWindow.hidden = NO;
+    // Put our ActionSheet in Container (it will be presented as soon as possible)
+    [SWActionSheet actionSheetContainer].actionSheet = self;
+}
+
+- (void)showInContainerViewAnimated:(BOOL)animated
+{
     CGPoint toPoint;
     CGFloat y = self.center.y - CGRectGetHeight(view.frame);
     toPoint = CGPointMake(self.center.x, y);
+    // Present actions
+    void (^animations)() = ^{
+        self.center = toPoint;
+        self.backgroundColor = [UIColor colorWithWhite:0.f alpha:0.5f];
+    };
+    // Present sheet
+    if (animated)
+        [UIView animateWithDuration:duration delay:delay options:options animations:animations completion:nil];
+    else
+        animations();
+    self.presented = YES;
+}
+
+@end
+
+
+#pragma mark - SWActionSheet Container
 
-    [UIView animateWithDuration:duration delay:delay
-                        options:options animations:^{
-         self.center = toPoint;
-         self.backgroundColor = [UIColor colorWithWhite:0.f alpha:0.5f];
-     }
-                     completion:^(BOOL finished) {
+@implementation SWActionSheetVC
 
-                     }];
+- (void)setActionSheet:(SWActionSheet *)actionSheet
+{
+    // Prevent processing one action sheet twice
+    if (_actionSheet == actionSheet)
+        return;
+    // Dissmiss previous action sheet if it presented
+    if (_actionSheet.presented)
+        [_actionSheet dismissWithClickedButtonIndex:0 animated:YES];
+    // Remember new action sheet
+    _actionSheet = actionSheet;
+    // Present new action sheet
+    [self presentActionSheetAnimated:YES];
+}
 
+- (void)viewWillAppear:(BOOL)animated
+{
+    [super viewWillAppear:animated];
+    [self presentActionSheetAnimated:YES];
 }
 
-- (BOOL)isViewPortrait
+- (void)presentActionSheetAnimated:(BOOL)animated
 {
-    return UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation);
+    // New action sheet will be presented only when view controller will be loaded
+    if (_actionSheet && [self isViewLoaded] && !_actionSheet.presented)
+    {
+        [_actionSheet configureFrameForBounds:self.view.bounds];
+        _actionSheet.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+        [self.view addSubview:_actionSheet];
+        [_actionSheet showInContainerViewAnimated:animated];
+    }
 }
 
 @end