How do I speed up iOS transitions and segues?

Is it possible to set a property application-wide to double the speed of transitions within an iOS app?

回答1:

Application-wide?

Try setting the speed property on the backing layer for your view controller's content views. speed=2 would be double-speed. You could probably set this in the viewDidLoad method for all your view controllers.

You might also be able to create a custom subclass of UIWindow, and have that window object set the speed property on it's view layer to 2.0 in a bottleneck method like makeKeyWindow. You'd need to make all your app's UIWindow objects use your custom class. I'd have to do some digging to figure out how to do that.

回答2:

Apple does not have a simple way to change that since it would make transitions too heterogenous amongst different apps. You could double the layer's speed, but that would mess up the timing on the rest of your animations. The best way is to implement your own transition using a category on UIViewControler.

UIViewController+ShowModalFromView.h

#import <Foundation/Foundation.h>
#import <QuartzCore/QuartzCore.h>

@interface UIViewController (ShowModalFromView)
- (void)presentModalViewController:(UIViewController *)modalViewController fromView:(UIView *)view;
@end

UIViewController+ShowModalFromView.m

#import "UIViewController+ShowModalFromView.h"

@implementation UIViewController (ShowModalFromView)

- (void)presentModalViewController:(UIViewController *)modalViewController fromView:(UIView *)view {
    modalViewController.modalPresentationStyle = UIModalPresentationFormSheet;

// Add the modal viewController but don't animate it. We will handle the animation manually
[self presentModalViewController:modalViewController animated:NO];

// Remove the shadow. It causes weird artifacts while animating the view.
CGColorRef originalShadowColor = modalViewController.view.superview.layer.shadowColor;
modalViewController.view.superview.layer.shadowColor = [[UIColor clearColor] CGColor];

// Save the original size of the viewController's view    
CGRect originalFrame = modalViewController.view.superview.frame;

// Set the frame to the one of the view we want to animate from
modalViewController.view.superview.frame = view.frame;

// Begin animation
[UIView animateWithDuration:1.0f
                 animations:^{
                     // Set the original frame back
                     modalViewController.view.superview.frame = originalFrame;
                 }
                 completion:^(BOOL finished) {
                     // Set the original shadow color back after the animation has finished
                     modalViewController.view.superview.layer.shadowColor = originalShadowColor;
                 }];
}

@end

This can easily be changed to use whatever animated transition you want. Hope this helps!