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1、MJPopupBackgroundView

• 1.1 MJPopupBackgroundView.h

  //
  //  MJPopupBackgroundView.h
  //  watched
  //
  //  Created by Martin Juhasz on 18.06.12.
  //  Copyright (c) 2012 martinjuhasz.de. All rights reserved.
  //
  
  #import <UIKit/UIKit.h>
  
  @interface MJPopupBackgroundView : UIView
  
  @end

• 1.2 MJPopupBackgroundView.h

  //
  //  MJPopupBackgroundView.m
  //  watched
  //
  //  Created by Martin Juhasz on 18.06.12.
  //  Copyright (c) 2012 martinjuhasz.de. All rights reserved.
  //
  
  #import "MJPopupBackgroundView.h"
  
  @implementation MJPopupBackgroundView
  
  - (void)drawRect:(CGRect)rect
  {
      CGContextRef context = UIGraphicsGetCurrentContext();
      size_t locationsCount = 2;
      CGFloat locations[2] = {0.0f, 1.0f};
      CGFloat colors[8] = {0.0f,0.0f,0.0f,0.0f,0.0f,0.0f,0.0f,0.75f}; 
      CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
      CGGradientRef gradient = CGGradientCreateWithColorComponents(colorSpace, colors, locations, locationsCount);
      CGColorSpaceRelease(colorSpace);
  
      CGPoint center = CGPointMake(self.bounds.size.width/2, self.bounds.size.height/2);
      float radius = MIN(self.bounds.size.width , self.bounds.size.height) ;
      CGContextDrawRadialGradient (context, gradient, center, 0, center, radius, kCGGradientDrawsAfterEndLocation);
      CGGradientRelease(gradient);
  }
  
  @end

2、UIViewController+MJPopupViewController

• 2.1 UIViewController+MJPopupViewController.h

  //
  //  UIViewController+MJPopupViewController.h
  //  MJModalViewController
  //
  //  Created by Martin Juhasz on 11.05.12.
  //  Copyright (c) 2012 martinjuhasz.de. All rights reserved.
  //
  
  #import <UIKit/UIKit.h>
  
  @class MJPopupBackgroundView;
  
  typedef enum {
      MJPopupViewAnimationFade = 0,
      MJPopupViewAnimationSlideBottomTop = 1,
      MJPopupViewAnimationSlideBottomBottom,
      MJPopupViewAnimationSlideTopTop,
      MJPopupViewAnimationSlideTopBottom,
      MJPopupViewAnimationSlideLeftLeft,
      MJPopupViewAnimationSlideLeftRight,
      MJPopupViewAnimationSlideRightLeft,
      MJPopupViewAnimationSlideRightRight,
  } MJPopupViewAnimation;
  
  @interface UIViewController (MJPopupViewController)
  
  @property (nonatomic, retain) UIViewController *mj_popupViewController;
  @property (nonatomic, retain) MJPopupBackgroundView *mj_popupBackgroundView;
  
  - (void)presentPopupViewController:(UIViewController*)popupViewController animationType:(MJPopupViewAnimation)animationType;
  - (void)presentPopupViewController:(UIViewController*)popupViewController animationType:(MJPopupViewAnimation)animationType dismissed:(void(^)(void))dismissed;
  - (void)dismissPopupViewControllerWithanimationType:(MJPopupViewAnimation)animationType;
  
  @end

• 2.1 UIViewController+MJPopupViewController.m

  //
  //  UIViewController+MJPopupViewController.m
  //  MJModalViewController
  //
  //  Created by Martin Juhasz on 11.05.12.
  //  Copyright (c) 2012 martinjuhasz.de. All rights reserved.
  //
  
  #import "UIViewController+MJPopupViewController.h"
  #import <QuartzCore/QuartzCore.h>
  #import "MJPopupBackgroundView.h"
  #import <objc/runtime.h>
  
  #define kPopupModalAnimationDuration 0.35
  #define kMJPopupViewController @"kMJPopupViewController"
  #define kMJPopupBackgroundView @"kMJPopupBackgroundView"
  #define kMJSourceViewTag 23941
  #define kMJPopupViewTag 23942
  #define kMJOverlayViewTag 23945
  
  @interface UIViewController (MJPopupViewControllerPrivate)
  
  - (UIView*)topView;
  - (void)presentPopupView:(UIView*)popupView;
  @end
  
  static NSString *MJPopupViewDismissedKey = @"MJPopupViewDismissed";
  static BOOL boards = NO;
  static BOOL MJPopupViewisShow = NO;
  ////////////////////////////////////////////////////////////////////////////
  #pragma mark -
  #pragma mark Public
  
  @implementation UIViewController (MJPopupViewController)
  
  static void * const keypath = (void*)&keypath;
  
  - (UIViewController*)mj_popupViewController {
      return objc_getAssociatedObject(self, kMJPopupViewController);
  }
  
  - (void)setMj_popupViewController:(UIViewController *)mj_popupViewController {
      objc_setAssociatedObject(self, kMJPopupViewController, mj_popupViewController, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
  
  }
  
  - (MJPopupBackgroundView*)mj_popupBackgroundView {
      return objc_getAssociatedObject(self, kMJPopupBackgroundView);
  }
  
  - (void)setMj_popupBackgroundView:(MJPopupBackgroundView *)mj_popupBackgroundView {
      objc_setAssociatedObject(self, kMJPopupBackgroundView, mj_popupBackgroundView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
  
  }
  
  - (void)presentPopupViewController:(UIViewController*)popupViewController animationType:(MJPopupViewAnimation)animationType dismissed:(void(^)(void))dismissed
  {
      if (!MJPopupViewisShow) {
          MJPopupViewisShow = YES;
          self.mj_popupViewController = popupViewController;
          [self presentPopupView:popupViewController.view animationType:animationType dismissed:dismissed];
      }
  }
  
  - (void)presentPopupViewController:(UIViewController*)popupViewController animationType:(MJPopupViewAnimation)animationType
  {
       [self presentPopupViewController:popupViewController animationType:animationType dismissed:nil];
  }
  
  - (void)dismissPopupViewControllerWithanimationType:(MJPopupViewAnimation)animationType
  {
      MJPopupViewisShow = NO;
      [[NSNotificationCenter defaultCenter] postNotificationName:@"MJPopupViewDismiss" object:nil];
      UIView *sourceView = [self topView];
      if (sourceView.tag != kMJSourceViewTag && sourceView.tag == kMJPopupViewTag) {
          sourceView = [sourceView superview];
      }
      UIView *popupView = [sourceView viewWithTag:kMJPopupViewTag];
      UIView *overlayView = [sourceView viewWithTag:kMJOverlayViewTag];
  
      switch (animationType) {
          case MJPopupViewAnimationSlideBottomTop:
          case MJPopupViewAnimationSlideBottomBottom:
          case MJPopupViewAnimationSlideTopTop:
          case MJPopupViewAnimationSlideTopBottom:
          case MJPopupViewAnimationSlideLeftLeft:
          case MJPopupViewAnimationSlideLeftRight:
          case MJPopupViewAnimationSlideRightLeft:
          case MJPopupViewAnimationSlideRightRight:
              [self slideViewOut:popupView sourceView:sourceView overlayView:overlayView withAnimationType:animationType];
              break;
  
          default:
              [self fadeViewOut:popupView sourceView:sourceView overlayView:overlayView];
              break;
      }
  }
  
  ////////////////////////////////////////////////////////////////////////////
  #pragma mark -
  #pragma mark View Handling
  
  - (void)presentPopupView:(UIView*)popupView animationType:(MJPopupViewAnimation)animationType
  {
      if (!MJPopupViewisShow) {
          MJPopupViewisShow = YES;
          [self presentPopupView:popupView animationType:animationType dismissed:nil];
      }
  }
  
  - (void)keyboardAppearanced
  {
      boards = YES;
  }
  
  - (void)keyboardDismissed
  {
      boards = NO;
  }
  
  - (void)presentPopupView:(UIView*)popupView animationType:(MJPopupViewAnimation)animationType dismissed:(void(^)(void))dismissed
  {
      boards = NO;
      [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardAppearanced) name:UIKeyboardDidShowNotification object:nil];
      [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDismissed) name:UIKeyboardDidHideNotification object:nil];
  
      UIView *sourceView = [self topView];
      sourceView.tag = kMJSourceViewTag;
      popupView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleLeftMargin |UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleRightMargin;
      popupView.tag = kMJPopupViewTag;
  
      // check if source view controller is not in destination
      if ([sourceView.subviews containsObject:popupView]) return;
  
      // customize popupView
      popupView.layer.shadowPath = [UIBezierPath bezierPathWithRect:popupView.bounds].CGPath;
      popupView.layer.masksToBounds = YES;
      popupView.layer.shadowOffset = CGSizeMake(5, 5);
      popupView.layer.shadowRadius = 5;
      popupView.layer.shadowOpacity = 0.5;
      popupView.layer.cornerRadius = 5;
      popupView.layer.shouldRasterize = YES;
      popupView.layer.rasterizationScale = [[UIScreen mainScreen] scale];
  
      // Add semi overlay
      UIView *overlayView = [[UIView alloc] initWithFrame:sourceView.bounds];
      overlayView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
      overlayView.tag = kMJOverlayViewTag;
      overlayView.backgroundColor = [UIColor clearColor];
  
      // BackgroundView
      self.mj_popupBackgroundView = [[MJPopupBackgroundView alloc] initWithFrame:sourceView.bounds];
      self.mj_popupBackgroundView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
      self.mj_popupBackgroundView.backgroundColor = [UIColor clearColor];
      self.mj_popupBackgroundView.alpha = 0.0f;
      [overlayView addSubview:self.mj_popupBackgroundView];
  
      // Make the Background Clickable
      UIButton * dismissButton = [UIButton buttonWithType:UIButtonTypeCustom];
      dismissButton.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
      dismissButton.backgroundColor = [UIColor clearColor];
      dismissButton.frame = sourceView.bounds;
      [overlayView addSubview:dismissButton];
  
      popupView.alpha = 0.0f;
      [overlayView addSubview:popupView];
      [sourceView addSubview:overlayView];
  
      [dismissButton addTarget:self action:@selector(dismissPopupViewControllerWithanimation:) forControlEvents:UIControlEventTouchUpInside];
      switch (animationType) {
          case MJPopupViewAnimationSlideBottomTop:
          case MJPopupViewAnimationSlideBottomBottom:
          case MJPopupViewAnimationSlideTopTop:
          case MJPopupViewAnimationSlideTopBottom:
          case MJPopupViewAnimationSlideLeftLeft:
          case MJPopupViewAnimationSlideLeftRight:
          case MJPopupViewAnimationSlideRightLeft:
          case MJPopupViewAnimationSlideRightRight:
              dismissButton.tag = animationType;
              [self slideViewIn:popupView sourceView:sourceView overlayView:overlayView withAnimationType:animationType];
              break;
          default:
              dismissButton.tag = MJPopupViewAnimationFade;
              [self fadeViewIn:popupView sourceView:sourceView overlayView:overlayView];
              break;
      }
  
      [self setDismissedCallback:dismissed];
  }
  
  - (UIView*)topView {
      UIViewController *recentView = self;
  
      while (recentView.parentViewController != nil) {
          recentView = recentView.parentViewController;
      }
      return recentView.view;
  }
  
  - (void)dismissPopupViewControllerWithanimation:(id)sender
  {
      if (boards)
      {
          [[NSNotificationCenter defaultCenter] postNotificationName:@"disMissKeyBoard" object:nil];
          return ;
      }
      if ([sender isKindOfClass:[UIButton class]]) {
          UIButton* dismissButton = sender;
          switch (dismissButton.tag) {
              case MJPopupViewAnimationSlideBottomTop:
              case MJPopupViewAnimationSlideBottomBottom:
              case MJPopupViewAnimationSlideTopTop:
              case MJPopupViewAnimationSlideTopBottom:
              case MJPopupViewAnimationSlideLeftLeft:
              case MJPopupViewAnimationSlideLeftRight:
              case MJPopupViewAnimationSlideRightLeft:
              case MJPopupViewAnimationSlideRightRight:
                  [self dismissPopupViewControllerWithanimationType:(int)dismissButton.tag];
                  break;
              default:
                  [self dismissPopupViewControllerWithanimationType:MJPopupViewAnimationFade];
                  break;
          }
      } else {
          [self dismissPopupViewControllerWithanimationType:MJPopupViewAnimationFade];
      }
  }
  
  //////////////////////////////////////////////////////////////////////////////
  #pragma mark -
  #pragma mark Animations
  
  #pragma mark --- Slide
  
  - (void)slideViewIn:(UIView*)popupView sourceView:(UIView*)sourceView overlayView:(UIView*)overlayView withAnimationType:(MJPopupViewAnimation)animationType
  {
      // Generating Start and Stop Positions
      CGSize sourceSize = sourceView.bounds.size;
      CGSize popupSize = popupView.bounds.size;
      CGRect popupStartRect;
      switch (animationType) {
          case MJPopupViewAnimationSlideBottomTop:
          case MJPopupViewAnimationSlideBottomBottom:
              popupStartRect = CGRectMake((sourceSize.width - popupSize.width) / 2,
                                          sourceSize.height,
                                          popupSize.width,
                                          popupSize.height);
  
              break;
          case MJPopupViewAnimationSlideLeftLeft:
          case MJPopupViewAnimationSlideLeftRight:
              popupStartRect = CGRectMake(-sourceSize.width,
                                          (sourceSize.height - popupSize.height) / 2,
                                          popupSize.width,
                                          popupSize.height);
              break;
  
          case MJPopupViewAnimationSlideTopTop:
          case MJPopupViewAnimationSlideTopBottom:
              popupStartRect = CGRectMake((sourceSize.width - popupSize.width) / 2,
                                          -popupSize.height,
                                          popupSize.width,
                                          popupSize.height);
              break;
  
          default:
              popupStartRect = CGRectMake(sourceSize.width,
                                          (sourceSize.height - popupSize.height) / 2,
                                          popupSize.width,
                                          popupSize.height);
              break;
      }
      CGRect popupEndRect = CGRectMake((sourceSize.width - popupSize.width) / 2,
                                       (sourceSize.height - popupSize.height) / 2,
                                       popupSize.width,
                                       popupSize.height);
  
      // Set starting properties
      popupView.frame = popupStartRect;
      popupView.alpha = 1.0f;
      [UIView animateWithDuration:kPopupModalAnimationDuration delay:0.0f options:UIViewAnimationOptionCurveEaseOut animations:^{
          [self.mj_popupViewController viewWillAppear:NO];
          self.mj_popupBackgroundView.alpha = 1.0f;
          popupView.frame = popupEndRect;
      } completion:^(BOOL finished) {
          [self.mj_popupViewController viewDidAppear:NO];
      }];
  }
  
  - (void)slideViewOut:(UIView*)popupView sourceView:(UIView*)sourceView overlayView:(UIView*)overlayView withAnimationType:(MJPopupViewAnimation)animationType
  {
      // Generating Start and Stop Positions
      CGSize sourceSize = sourceView.bounds.size;
      CGSize popupSize = popupView.bounds.size;
      CGRect popupEndRect;
      switch (animationType) {
          case MJPopupViewAnimationSlideBottomTop:
          case MJPopupViewAnimationSlideTopTop:
              popupEndRect = CGRectMake((sourceSize.width - popupSize.width) / 2,
                                        -popupSize.height,
                                        popupSize.width,
                                        popupSize.height);
              break;
          case MJPopupViewAnimationSlideBottomBottom:
          case MJPopupViewAnimationSlideTopBottom:
              popupEndRect = CGRectMake((sourceSize.width - popupSize.width) / 2,
                                        sourceSize.height,
                                        popupSize.width,
                                        popupSize.height);
              break;
          case MJPopupViewAnimationSlideLeftRight:
          case MJPopupViewAnimationSlideRightRight:
              popupEndRect = CGRectMake(sourceSize.width,
                                        popupView.frame.origin.y,
                                        popupSize.width,
                                        popupSize.height);
              break;
          default:
              popupEndRect = CGRectMake(-popupSize.width,
                                        popupView.frame.origin.y,
                                        popupSize.width,
                                        popupSize.height);
              break;
      }
  
      [UIView animateWithDuration:kPopupModalAnimationDuration delay:0.0f options:UIViewAnimationOptionCurveEaseIn animations:^{
          [self.mj_popupViewController viewWillDisappear:NO];
          popupView.frame = popupEndRect;
          self.mj_popupBackgroundView.alpha = 0.0f;
      } completion:^(BOOL finished) {
          [popupView removeFromSuperview];
          [overlayView removeFromSuperview];
          [self.mj_popupViewController viewDidDisappear:NO];
          self.mj_popupViewController = nil;
  
          id dismissed = [self dismissedCallback];
          if (dismissed != nil)
          {
              ((void(^)(void))dismissed)();
              [self setDismissedCallback:nil];
          }
      }];
  }
  
  #pragma mark --- Fade
  - (void)fadeViewIn:(UIView*)popupView sourceView:(UIView*)sourceView overlayView:(UIView*)overlayView
  {
      // Generating Start and Stop Positions
      CGSize sourceSize = sourceView.bounds.size;
      CGSize popupSize = popupView.bounds.size;
      CGRect popupEndRect = CGRectMake((sourceSize.width - popupSize.width) / 2,
                                       (sourceSize.height - popupSize.height) / 2,
                                       popupSize.width,
                                       popupSize.height);
  
      // Set starting properties
      popupView.frame = popupEndRect;
      popupView.alpha = 0.0f;
  
      [UIView animateWithDuration:kPopupModalAnimationDuration animations:^{
          [self.mj_popupViewController viewWillAppear:NO];
          self.mj_popupBackgroundView.alpha = 0.5f;
          popupView.alpha = 1.0f;
      } completion:^(BOOL finished) {
          [self.mj_popupViewController viewDidAppear:NO];
      }];
  }
  
  - (void)fadeViewOut:(UIView*)popupView sourceView:(UIView*)sourceView overlayView:(UIView*)overlayView
  {
      [UIView animateWithDuration:kPopupModalAnimationDuration animations:^{
          [self.mj_popupViewController viewWillDisappear:NO];
          self.mj_popupBackgroundView.alpha = 0.0f;
          popupView.alpha = 0.0f;
      } completion:^(BOOL finished) {
          [popupView removeFromSuperview];
          [overlayView removeFromSuperview];
          [self.mj_popupViewController viewDidDisappear:NO];
          self.mj_popupViewController = nil;
  
          id dismissed = [self dismissedCallback];
          if (dismissed != nil)
          {
              ((void(^)(void))dismissed)();
              [self setDismissedCallback:nil];
          }
      }];
  }
  
  #pragma mark - Category Accessors
  
  #pragma mark --- Dismissed
  
  - (void)setDismissedCallback:(void(^)(void))dismissed
  {
      objc_setAssociatedObject(self, &MJPopupViewDismissedKey, dismissed, OBJC_ASSOCIATION_RETAIN);
  }
  
  - (void(^)(void))dismissedCallback
  {
      return objc_getAssociatedObject(self, &MJPopupViewDismissedKey);
  }
  
  @end

UIViewController+MJPopupViewController

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原文地址：https://www.cnblogs.com/CH520/p/9656672.html