iOS 转场动画

model类型的转场动画系统默认提供了4个

UIModalTransitionStyleCoverVertical,   //垂直上入(默认)
UIModalTransitionStyleFlipHorizontal,  //水平反转
UIModalTransitionStyleCrossDissolve,   //渐显效果 
UIModalTransitionStylePartialCurl      //翻页效果
//使用方式
QMoreViewController *moreVC = [[QMoreViewController alloc] init];
 moreVC.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
moreVC.transitioningDelegate = animation;
[self presentViewController:moreVC animated:YES completion:nil}];

自定义的话 建议构造一个转场对象，具体如下QTranstionAnimation对象

#import <UIKit/UIKit.h>

typedef NS_ENUM(NSUInteger, QTranstionAnimationType) {
    QTranstionAnimationType_FromTop,   //上进上出
    QTranstionAnimationType_FadeInOut   //淡入淡出
};

@interface QTranstionAnimation : NSObject<UIViewControllerTransitioningDelegate,UIViewControllerAnimatedTransitioning>

//初始化
+(instancetype)shareInstance;

/**
 动画类型
 */
@property (nonatomic, assign) QTranstionAnimationType animatType;

@end

#import "QTranstionAnimation.h"
#import "QPresentationController.h"

static QTranstionAnimation *transtion = nil;

@interface QTranstionAnimation()
@property (nonatomic, assign) BOOL isPresnted;
@end;

@implementation QTranstionAnimation
//构造单例
+(instancetype)shareInstance{
    
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        transtion = [[super allocWithZone:nil] init];
    });
    return transtion;
}

+(instancetype)allocWithZone:(struct _NSZone *)zone{
    return [QTranstionAnimation shareInstance];
}

- (id)copyWithZone:(struct _NSZone *)zone {
    return [QTranstionAnimation shareInstance];
}

#pragma mark - UIViewControllerContextTransitioning
- (void)animateTransition:(nonnull id<UIViewControllerContextTransitioning>)transitionContext {
        
    if (self.isPresnted == YES) {
        //1.取出view
        UIView *presentedView = [transitionContext viewForKey:UITransitionContextToViewKey];
        //2.放入containerView
        [[transitionContext containerView] addSubview:presentedView];
        //3.自定义添加动画
        if(self.animatType == QTranstionAnimationType_FromTop){
            
            presentedView.frame = CGRectMake(0, -kScreenH, kScreenW, kScreenH);
            [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
                presentedView.frame = CGRectMake(0, 0, kScreenW, kScreenH);
            }completion:^(BOOL finished) {
                [transitionContext completeTransition:YES];
            }];
            
        }else if(self.animatType == QTranstionAnimationType_FadeInOut){
            
            presentedView.alpha = 0;
            [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
                presentedView.alpha = 1.0;
            }completion:^(BOOL finished) {
                [transitionContext completeTransition:YES];
            }];
        }
  
    } else {
        //1.取出view
        UIView *dismissedView = [transitionContext viewForKey:UITransitionContextFromViewKey];
        //2.放入containerView
        [[transitionContext containerView]addSubview:dismissedView];
        //3.自定义添加动画
        if(self.animatType == QTranstionAnimationType_FromTop){
            
            [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
                dismissedView.frame =CGRectMake(0, -kScreenH, kScreenW, kScreenH);
            }completion:^(BOOL finished) {
                [transitionContext completeTransition:YES];
            }];
            
        }else if (self.animatType == QTranstionAnimationType_FadeInOut){
            
            dismissedView.alpha = 1;
            [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
                dismissedView.alpha = 0;
            }completion:^(BOOL finished) {
                [transitionContext completeTransition:YES];
            }];
        }
    }
}

- (NSTimeInterval)transitionDuration:(nullable id<UIViewControllerContextTransitioning>)transitionContext {
    return 0.5f;
}

#pragma mark - UIViewControllerTransitioningDelegate
//设置负责进场的对象
-(id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
    self.isPresnted = YES;
    return self;
}
//设置负责出场的对象
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
    self.isPresnted = NO;
    return self;
}
//以下两个方法负责交互处理
//- (nullable id <UIViewControllerInteractiveTransitioning>)interactionControllerForPresentation:(id <UIViewControllerAnimatedTransitioning>)animator;
//- (nullable id <UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id <UIViewControllerAnimatedTransitioning>)animator;

//该方法为对容器的处理
- (nullable UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented presentingViewController:(nullable UIViewController *)presenting sourceViewController:(UIViewController *)source NS_AVAILABLE_IOS(8_0){
    
    QPresentationController *persentVC = [[QPresentationController alloc] initWithPresentedViewController:presented presentingViewController:presenting];
    persentVC.contentFrame = CGRectMake((kScreenW-300)/2, (kScreenH-400)/2, 300, 400);
    return persentVC;
}
@end

自定义容器为QPresentationController

#import "QPresentationController.h"

@interface QPresentationController()
@property (nonatomic, strong) UIView *coverView;//蒙板
@end

@implementation QPresentationController

-(void)containerViewWillLayoutSubviews{
    [super containerViewWillLayoutSubviews];
    
    self.presentedView.frame = self.contentFrame;
    [self.containerView insertSubview:self.coverView atIndex:0];
    
}

-(void)didMissAction{
    [self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
}

-(UIView *)coverView{
    if(!_coverView){
        _coverView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
        _coverView.backgroundColor = [UIColor colorWithWhite:0.8 alpha:0.3];
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didMissAction)];
        [_coverView addGestureRecognizer:tap];
    }
    return _coverView;
}

@end

最后 具体使用

QTranstionAnimation *animation = [QTranstionAnimation shareInstance];
 QMoreViewController *moreVC = [[QMoreViewController alloc] init];
moreVC.modalPresentationStyle = UIModalPresentationCustom;
                    moreVC.transitioningDelegate = animation;
 [self presentViewController:moreVC animated:YES completion:^{
                        
                    }];