Adds present button to SampleViewController's view which presents modally another SampleViewController. This demonstrates iOS 7 bug when presenting modally from a presented modally view controller.

ModalPresentation/Custom Modal Presentation/NGModalAnimationController.m

@@ -9,7 +9,7 @@
 #import "NGModalAnimationController.h"
 
 
-static NSTimeInterval const kTransitionDuration = 0.5;
+static NSTimeInterval const kTransitionDuration = 2;
 
 
 @interface NGModalAnimationController ()
@@ -119,6 +119,20 @@ static NSTimeInterval const kTransitionDuration = 0.5;
     {
         [containerView addSubview:toView];
         [self centerView:toView withSize:toViewController.preferredContentSize inView:containerView];
+        
+        NSLog(@"CSModalAnimationControllerModePresentation");
+        NSLog(@"fromView initial frame %@", NSStringFromCGRect([transitionContext initialFrameForViewController:fromViewController]));
+        NSLog(@"fromView final frame   %@", NSStringFromCGRect([transitionContext finalFrameForViewController:fromViewController]));
+        NSLog(@"toView initial frame   %@", NSStringFromCGRect([transitionContext initialFrameForViewController:toViewController]));
+        NSLog(@"toView final frame     %@", NSStringFromCGRect([transitionContext finalFrameForViewController:toViewController]));
+    }
+    else
+    {
+        NSLog(@"NGModalAnimationControllerModeDismissal");
+        NSLog(@"fromView initial frame %@", NSStringFromCGRect([transitionContext initialFrameForViewController:fromViewController]));
+        NSLog(@"fromView final frame   %@", NSStringFromCGRect([transitionContext finalFrameForViewController:fromViewController]));
+        NSLog(@"toView initial frame   %@", NSStringFromCGRect([transitionContext initialFrameForViewController:toViewController]));
+        NSLog(@"toView final frame     %@", NSStringFromCGRect([transitionContext finalFrameForViewController:toViewController]));
     }
     
     // find the presented view controller's view

ModalPresentation/SampleViewController.m

@@ -7,8 +7,9 @@
 //
 
 #import "SampleViewController.h"
+#import "UIViewController+NGModalPresentation.h"
 
-@interface SampleViewController ()
+@interface SampleViewController () <SampleViewControllerDelegate>
 
 @property (strong, nonatomic, readonly) UILabel * label;
 
@@ -24,8 +25,6 @@
     self.view.backgroundColor = viewBackgroundColor;
 }
 
-#pragma mark - Public Class Methods
-#pragma mark - Public Instance Methods
 #pragma mark - IBActions
 
 - (void)dismissButtonTapped:(UIButton *)sender
@@ -33,13 +32,22 @@
     [self.delegate sampleViewControllerRequiredDismiss:self];
 }
 
+- (void)presentButtonTapped:(UIButton *)sender
+{
+    SampleViewController * sampleViewController = [[SampleViewController alloc] init];
+    sampleViewController.preferredContentSize = CGSizeMake(self.preferredContentSize.width + 40, self.preferredContentSize.height + 80);
+    sampleViewController.viewBackgroundColor = [self colorByDarkeningColor:self.viewBackgroundColor];
+    sampleViewController.delegate = self;
+    [self ng_presentViewController:sampleViewController animated:YES completion:nil];
+}
+
 #pragma mark - Overridden
 
 - (instancetype)init
 {
     self = [super init];
     if (self) {
-        _viewBackgroundColor = [UIColor colorWithRed:0.1882 green:0.6431 blue:0.8667 alpha:1.0000];
+        _viewBackgroundColor = [UIColor colorWithRed:0.9373 green:0.9373 blue:0.9373 alpha:1.0000];
     }
     return self;
 }
@@ -47,6 +55,8 @@
 - (void)loadView
 {
     UIView * view = [[UIView alloc] init];
+    view.layer.borderColor = [[UIColor blackColor] CGColor];
+    view.layer.borderWidth = 1;
     
     _label = [[UILabel alloc] init];
     _label.textAlignment = NSTextAlignmentCenter;
@@ -58,15 +68,25 @@
     [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_label]|" options:0 metrics:nil views:views]];
     [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_label]|" options:0 metrics:nil views:views]];
     
-    UIButton * button = [UIButton buttonWithType:UIButtonTypeSystem];
+    UIButton * dismissButton = [UIButton buttonWithType:UIButtonTypeSystem];
-    [button setTitle:@"Dismiss" forState:UIControlStateNormal];
+    [dismissButton setTitle:@"Dismiss" forState:UIControlStateNormal];
-    [button addTarget:self action:@selector(dismissButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
+    [dismissButton addTarget:self action:@selector(dismissButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
-    button.translatesAutoresizingMaskIntoConstraints = NO;
+    dismissButton.translatesAutoresizingMaskIntoConstraints = NO;
-    [view addSubview:button];
+    [view addSubview:dismissButton];
     
-    views = NSDictionaryOfVariableBindings(button);
+    views = NSDictionaryOfVariableBindings(dismissButton);
-    [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[button]-|" options:0 metrics:nil views:views]];
+    [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[dismissButton]-|" options:0 metrics:nil views:views]];
-    [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-32-[button]" options:0 metrics:nil views:views]];
+    [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-32-[dismissButton]" options:0 metrics:nil views:views]];
+    
+    UIButton * presentButton = [UIButton buttonWithType:UIButtonTypeSystem];
+    [presentButton setTitle:@"Present" forState:UIControlStateNormal];
+    [presentButton addTarget:self action:@selector(presentButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
+    presentButton.translatesAutoresizingMaskIntoConstraints = NO;
+    [view addSubview:presentButton];
+    
+    views = NSDictionaryOfVariableBindings(presentButton, _label);
+    [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[presentButton]-|" options:0 metrics:nil views:views]];
+    [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[presentButton]-|" options:0 metrics:nil views:views]];
     
     self.view = view;
 }
@@ -76,14 +96,28 @@
     [super viewDidLoad];
     
     self.view.backgroundColor = self.viewBackgroundColor;
-    self.label.text = [NSString stringWithFormat:@"Sample View Controller\n"
+    self.label.text = [NSString stringWithFormat:@"%@\n"
-                                                 @"Preferred Content Size: %@", NSStringFromCGSize(self.preferredContentSize)];
+                                                 @"Preferred Content Size: %@", self, NSStringFromCGSize(self.preferredContentSize)];
 }
 
-#pragma mark - Private Properties
-#pragma mark - Private Class Methods
 #pragma mark - Private Instance Methods
-#pragma mark - Protocols
+
-#pragma mark - Notifications
+- (UIColor *)colorByDarkeningColor:(UIColor *)color
+{
+    CGFloat r, g, b, a;
+    if ([color getRed:&r green:&g blue:&b alpha:&a])
+        return [UIColor colorWithRed:MAX(r * 0.8, 0.0)
+                               green:MAX(g * 0.8, 0.0)
+                                blue:MAX(b * 0.8, 0.0)
+                               alpha:a];
+    return nil;
+}
+
+#pragma mark - SampleViewControllerDelegate
+
+- (void)sampleViewControllerRequiredDismiss:(SampleViewController *)sampleViewController
+{
+    [self dismissViewControllerAnimated:YES completion:nil];
+}
 
 @end