iOS 自定义viewController 切换 （modal）

自己写的一个modal 显示 ，为了解决 modal显示不能全屏的问题 代码如下：

类 实现动画协议

#import <Foundation/Foundation.h>

@interface TransitionDelegate : NSObject

@property (nonatomic, weak) UIViewController *delegate;

• (id)initWithDelegate:(UIViewController *)delegate;
• (void)presentViewController:(UIViewController *)modalViewController;
  @end

#import "TransitionDelegate.h"
#import "AnimatedTransitioning.h"
#import "AnimatedTransitioningDismiss.h"

@implementation TransitionDelegate
//===================================================================
// - UIViewControllerTransitioningDelegate
//===================================================================

• (id)initWithDelegate:(UIViewController *)delegate
  {
  self = [super init];
  if (self) {
  self.delegate = delegate;
  }
  return self;
  }

• (void)presentViewController:(UIViewController *)modalViewController
  {
  modalViewController.modalPresentationStyle = UIModalPresentationCustom;
  modalViewController.transitioningDelegate = self;
  [self.delegate presentViewController:modalViewController animated:YES completion:^{
  }];
  }

• (id )animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
  id animator;
  animator = [[AnimatedTransitioning alloc] init];
  return animator;
  }

• (id )animationControllerForDismissedController:(UIViewController *)dismissed {

  id animator;
  animator = [[AnimatedTransitioningDismiss alloc] init];
  return animator;
  }

@end

类 实现显示动画

#import <Foundation/Foundation.h>

@interface AnimatedTransitioning : NSObject

@end

#import "AnimatedTransitioning.h"

@implementation AnimatedTransitioning

//===================================================================
// - UIViewControllerAnimatedTransitioning
//===================================================================

• (NSTimeInterval)transitionDuration:(id )transitionContext {
  return 0.25f;
  }

• (void)animateTransition:(id )transitionContext {

  UIView *inView = [transitionContext containerView];
  UIViewController *toVC = (UIViewController *)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
  UIViewController *fromVC = (UIViewController *)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];

  [inView addSubview:toVC.view];

  CGRect screenRect = [[UIScreen mainScreen] bounds];
  [toVC.view setFrame:CGRectMake(0, screenRect.size.height, fromVC.view.frame.size.width, fromVC.view.frame.size.height)];

  [UIView animateWithDuration:0.25f
  animations:^{

                     [toVC.view setFrame:CGRectMake(0, 0, fromVC.view.frame.size.width, fromVC.view.frame.size.height)];
                 }
                 completion:^(BOOL finished) {
                     [transitionContext completeTransition:YES];
                 }];
  

}

@end

类 实现dismiss动画

import <Foundation/Foundation.h>

@interface AnimatedTransitioningDismiss : NSObject

@end

#import "AnimatedTransitioningDismiss.h"

@implementation AnimatedTransitioningDismiss

• (NSTimeInterval)transitionDuration:(id)transitionContext
  {
  return 0.25f;
  }

• (void)animateTransition:(id)transitionContext
  {
  UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];

  CGRect initialFrame = [transitionContext initialFrameForViewController:fromVC];

  CGRect finalFrame = CGRectOffset(initialFrame, 0, CGRectGetHeight(transitionContext.containerView.frame));

  UIViewAnimationOptions opts = UIViewAnimationOptionCurveLinear;

  [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0 options:opts animations:^{
  fromVC.view.frame = finalFrame;
  } completion:^(BOOL finished) {
  [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
  }];
  }

@end

调用方式 [self.transitioningDelegate presentViewController:sns];