/* |
File: ViewController.m |
Abstract: The view controller used for transitioning between two UIViews. |
Version: 1.12 |
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*/ |
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#import "ViewController.h" |
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@interface ViewController () |
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@property (nonatomic, strong) IBOutlet UIImageView *frontView; |
@property (nonatomic, strong) IBOutlet UIImageView *backView; |
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@property (nonatomic, weak) IBOutlet UIBarButtonItem *fadeButton; |
@property (nonatomic, weak) IBOutlet UIBarButtonItem *flipButton; |
@property (nonatomic, weak) IBOutlet UIBarButtonItem *bounceButton; |
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@property (nonatomic, strong) NSArray *priorConstraints; |
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- (IBAction)flipAction:(id)sender; |
- (IBAction)fadeAction:(id)sender; |
- (IBAction)bounceAction:(id)sender; |
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@end |
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#pragma mark - |
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@implementation ViewController |
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// makes "subview" match the width and height of "superview" by adding the proper auto layout constraints |
// |
- (NSArray *)constrainSubview:(UIView *)subview toMatchWithSuperview:(UIView *)superview |
{ |
subview.translatesAutoresizingMaskIntoConstraints = NO; |
NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(subview); |
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NSArray *constraints = [NSLayoutConstraint |
constraintsWithVisualFormat:@"H:|[subview]|" |
options:0 |
metrics:nil |
views:viewsDictionary]; |
constraints = [constraints arrayByAddingObjectsFromArray: |
[NSLayoutConstraint |
constraintsWithVisualFormat:@"V:|[subview]|" |
options:0 |
metrics:nil |
views:viewsDictionary]]; |
[superview addConstraints:constraints]; |
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return constraints; |
} |
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- (void)viewDidLoad |
{ |
[super viewDidLoad]; |
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// start off by using the front view (Palm trees) |
[self.view addSubview:self.frontView]; |
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// since frontView has no constraints set to match it's superview, we set them here |
_priorConstraints = [self constrainSubview:self.frontView toMatchWithSuperview:self.view]; |
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// configure our toolbar with the appropriate transition effects |
// note: the bounce button only shows for iOS 7.0 or later |
// |
UIBarButtonItem *flexItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; |
NSMutableArray *toolbarButtons = [NSMutableArray arrayWithObjects:flexItem, self.fadeButton, self.flipButton, nil]; |
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if ([[UIView class] respondsToSelector: |
@selector(animateWithDuration:delay:usingSpringWithDamping:initialSpringVelocity:options:animations:completion:)]) |
{ |
[toolbarButtons addObject:self.bounceButton]; |
} |
[toolbarButtons addObject:flexItem]; |
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self.toolbarItems = toolbarButtons; |
} |
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- (void)performTransition:(UIViewAnimationOptions)options |
{ |
UIView *fromView, *toView; |
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if ([self.frontView superview] != nil) |
{ |
fromView = self.frontView; |
toView = self.backView; |
} |
else |
{ |
fromView = self.backView; |
toView = self.frontView; |
} |
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NSArray *priorConstraints = self.priorConstraints; |
[UIView transitionFromView:fromView |
toView:toView |
duration:1.0 |
options:options |
completion:^(BOOL finished) { |
// animation completed |
if (priorConstraints != nil) |
{ |
[self.view removeConstraints:priorConstraints]; |
} |
}]; |
_priorConstraints = [self constrainSubview:toView toMatchWithSuperview:self.view]; |
} |
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#pragma mark - Actions |
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- (IBAction)fadeAction:(id)sender |
{ |
[self performTransition:UIViewAnimationOptionTransitionCrossDissolve]; |
} |
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- (IBAction)flipAction:(id)sender |
{ |
UIViewAnimationOptions transitionOptions = ([self.frontView superview] != nil) ? |
UIViewAnimationOptionTransitionFlipFromLeft : UIViewAnimationOptionTransitionFlipFromRight; |
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[self performTransition:transitionOptions]; |
} |
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- (IBAction)bounceAction:(id)sender |
{ |
if ([[UIView class] respondsToSelector: |
@selector(animateWithDuration:delay:usingSpringWithDamping:initialSpringVelocity:options:animations:completion:)]) |
{ |
// no other transitions are allowed until this one finishes |
self.navigationController.toolbar.userInteractionEnabled = NO; |
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UIView *fromView, *toView; |
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if ([self.frontView superview] != nil) |
{ |
fromView = self.frontView; |
toView = self.backView; |
} |
else |
{ |
fromView = self.backView; |
toView = self.frontView; |
} |
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CGRect startFrame = self.view.frame; |
CGRect endFrame = self.view.frame; |
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// the start position is below the bottom of the visible frame |
startFrame.origin.y = -startFrame.size.height; |
endFrame.origin.y = 0; |
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toView.frame = startFrame; |
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NSArray *priorConstraints = self.priorConstraints; |
[self.view addSubview:toView]; |
[UIView animateWithDuration:1.0f |
delay:0.0 |
usingSpringWithDamping:0.5 |
initialSpringVelocity:5.0 |
options:0 |
animations:^{ toView.frame = endFrame; } |
completion:^(BOOL finished) { |
// slide down animation finished, remove the older view and the constraints |
// |
if (priorConstraints != nil) |
[self.view removeConstraints:priorConstraints]; |
[fromView removeFromSuperview]; |
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self.navigationController.toolbar.userInteractionEnabled = YES; |
}]; |
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// apply the new constraints to our newly added subview |
_priorConstraints = [self constrainSubview:toView toMatchWithSuperview:self.view]; |
} |
} |
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@end |
