屏幕旋转与自定义转场

屏幕旋转

• Orientation ：方向

1. device Orientation
2. interface Orientation

屏幕向右转，设备向左转才能正确显示

image.png

设备旋转的结果，这个时候界面的旋转还没有结束，在这里可以自行控制界面的旋转方向。

开发过程中有可能需要排除这两个方向

在这个通知里，界面界面已经旋转结束了

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第一个shouldAutorotate表示是否可以响应屏幕的自动旋转，第二个是表示用位运算表示的屏幕方向，默认情况下支持所有方向但不支持upsitedown

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ios8之前

ios8之后会统一到一个方法里面

这些都是面向方向的，他会已当前设备方向来返回一个尺寸

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需求：竖屏的时候默认控件上下结构，横屏的时候是左右结构

思路：发生旋转的时候重新layout，要用到下面的方法

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id)coordinator
{  
   //animateAlongsideTransition第一个block表示正在旋转中，第二个表示旋转结束后
    [coordinator animateAlongsideTransition:^(id  _Nonnull context) {
         if (UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation))
    {
        _button.frame = CGRectMake(100, 100, 150, 50);
        _textField.frame = CGRectMake(100, 300, 200, 30);
    }
    else
    {
        _button.frame = CGRectMake(100, 100, 150, 50);
        _textField.frame = CGRectMake(300, 100, 200, 30);
    }
        
    } completion:^(id  _Nonnull context) {
        
        NSLog(@"screen bounds %@", NSStringFromCGRect([UIScreen mainScreen].bounds));
        
    }];
    
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
}

强制屏幕旋转

在某些情况下需要做隐藏statusBar的操作

已经设置了四个页面的旋转，有的页面又想让他固定在一个页面上

可以让当前页面一直保持竖屏的状态

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自定义转场类型

实现自定义转场最少的需求

image.png

image.png

非交互式转场

image.png

告诉系统用自定义而非默认

第一个方法在present到model的时候用自定义的转场，第二个方法是在dismiss的时候用自定义转场

实现转场过程动画

1.动画时长，2.转场动画在这里实现

转场过程数据

1.containerView表示VC在切换的时候的view容器，2.completeTransition向context汇报切换已经完成了,3.viewControllerForkew,viewForkey获取相关的viewController或者view的方法，4，initialframeForview、finalFrameForview分别表示的是起始位置和终点位置。

1.即将消失的Controller称之为fromviewcontroller，即将出现的controller称为Toviewcontroller

实现

demo

present的自定义转场

@interface TestViewController()
{
    PresentAnimation *_presentAnimation;
    DismissAnimation *_dismissAnimation;
}
-(void)init
{
  _presentAnimation = [[PresentAnimation alloc] init];
        _dismissAnimation = [[DismissAnimation alloc] init];
}
//1.添加代理方法
TestSecondViewController *modalVC = [[TestSecondViewController alloc] initWithFromPush:NO];
    modalVC.delegate = self;
    modalVC.transitioningDelegate = self;

  //设置这个present之前的视图不会消失，如果面层forscreen的话会让之前视图消失
  modalVC.modalPresentationStyle = UIModalPresentationCustom;
    
    [self presentViewController:modalVC animated:YES completion:nil];

#pragma mark - transitioning delegate
//实现代理方法
- (nullable id )animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source;
{
    if ([presented isKindOfClass:[TestSecondViewController class]])
    {
          //返回自己定义的动画
        return _presentAnimation;
    }
    return nil;
}

- (nullable id )animationControllerForDismissedController:(UIViewController *)dismissed
{
    if ([dismissed isKindOfClass:[TestSecondViewController class]])
    {
        return _dismissAnimation;
    }

    return nil;
}

#import 
#import 

@interface PresentAnimation : NSObject

@end
#import "PresentAnimation.h"

@implementation PresentAnimation

- (NSTimeInterval)transitionDuration:(nullable id )transitionContext
{
    return 1;
}

- (void)animateTransition:(id)transitionContext
{
    //获取推入的VC
    UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    //获取推出的VC
    UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];
    //做动画需要获取containview
    UIView *containerView = [transitionContext containerView];
    [containerView addSubview:toView];
    
    //获取最终推入的VC坐标
    CGRect targetFrame = [transitionContext finalFrameForViewController:toVC];
    //设置准备推出的view的位置：当前为屏幕的上方
    toView.frame = CGRectOffset(targetFrame, 0, - targetFrame.size.height);
    
    //another try
//    targetFrame = CGRectOffset(targetFrame, 0, 200);
    //获取这个方法的时长
    NSTimeInterval duration = [self transitionDuration:transitionContext];
    //添加这个动画
    [UIView animateWithDuration:duration delay:0 usingSpringWithDamping:0.6 initialSpringVelocity:0 options:UIViewAnimationOptionCurveLinear animations:^{
        
        toView.frame = targetFrame;
        
    } completion:^(BOOL finished) {
        //完成之后结束动画
        [transitionContext completeTransition:YES];
        
    }];
}

@end


#import 
#import 

@interface DismissAnimation : NSObject

@end

#import "DismissAnimation.h"

@implementation DismissAnimation

- (NSTimeInterval)transitionDuration:(id)transitionContext
{
    return 1;
}

- (void)animateTransition:(id)transitionContext
{
    UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];
    
    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIView *fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];
    
    UIView *containerView = [transitionContext containerView];
    [containerView addSubview:toView];
    [containerView sendSubviewToBack:toView];
    
    CGRect initFrame = [transitionContext initialFrameForViewController:fromVC];
    CGRect targetFrame = CGRectOffset(initFrame, 0, - initFrame.size.height);
    
    NSTimeInterval duration = [self transitionDuration:transitionContext];
    
    [UIView animateWithDuration:duration animations:^{
        
        fromView.frame = targetFrame;
        
    } completion:^(BOOL finished) {
        
        [transitionContext completeTransition:YES];
    }];
}

@end