Ios 自定义弹出对话框

我正在研究如何实现自定义弹出对话框，如下图所示，并遇到了实现这一目标的各种方法

1-调用位于屏幕外部的

视图

，该视图向当前视图层次结构添加覆盖，并以动画方式显示到屏幕中心

2-使用需要大量代码的UIPresentationController

3-使用吊舱

我想知道iOS中此类弹出窗口的当前状态，以及最简单和最直接的实现方式

我正在寻找一个答案，详尽地比较现有的选择，并清楚地表明每种选择的利弊

---

如果您支持iOS 8及以上版本（如果可能的话，您应该支持！），我建议使用UIViewController和UIPresentationController在后台处理窗帘视图

我的理由：

•这两种API都是全新的100%原生API

•苹果对其自己的一些API（请参阅UIAlertController）进行了有趣的更改，在这些API中，他们已从UIView/uicontrol转换到UIViewController

我应该注意到，UIViewController在这里可能有些过分，因为我觉得popover非常简单。不过，它的实现也非常简单

下面是我正在演示的UIViewController的一些示例代码：

第二个ViewController是popover：

#import "SecondViewController.h"
#import "SecondPresentationController.h"

@interface SecondViewController () <UIViewControllerTransitioningDelegate, UIViewControllerAnimatedTransitioning>

@property (nonatomic, getter=isPresenting) BOOL presenting;

@end


@implementation SecondViewController

#pragma mark - Initialization

- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        self.transitioningDelegate = self;
        self.modalPresentationStyle = UIModalPresentationCustom;
        self.view.layer.cornerRadius = 5.0f;
        self.view.clipsToBounds = YES;
    }

    return self;
}


#pragma mark - Content Size

- (CGSize)preferredContentSize {

    return CGSizeMake(266.0f, 143.0f); // The static size of the test image I'm using for this sample code.
}


#pragma mark - UIViewControllerTransitioningDelegate

- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {

    return 1.0;
}

- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {

    self.presenting = YES; /// Used in animateTransition

    return self;
}


- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {

    self.presenting = NO; /// Used in animateTransition

    return self;
}


- (UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented presentingViewController:(UIViewController *)presenting sourceViewController:(UIViewController *)source {

    return [[SecondPresentationController alloc] initWithPresentedViewController:self presentingViewController:self.presentingViewController];
}


#pragma mark - UIViewControllerAnimatedTransitioning

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {

    UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    [[transitionContext containerView] addSubview:toViewController.view];

    CGSize preferredSize = toViewController.preferredContentSize;

    // onscreenFrame will be in the center of the superview, while offscreen will be just below the superview (and off of the screen completely)

    CGRect onscreenFrame = CGRectMake((fromViewController.view.bounds.size.width - preferredSize.width) * 0.5f, (fromViewController.view.bounds.size.height - preferredSize.height) * 0.5f,
                                      preferredSize.width, preferredSize.height);

    CGRect offscreenFrame = onscreenFrame;

    offscreenFrame.origin.y = fromViewController.view.bounds.size.height;

    // Set the *initial* frame for the viewController.

    if (self.isPresenting) {

        toViewController.view.frame = offscreenFrame;
    }
    else {

        toViewController.view.frame = onscreenFrame;
    }

    [UIView animateWithDuration:0.5 delay:0.0 usingSpringWithDamping:0.8f initialSpringVelocity:0.8f options:kNilOptions animations:^{

        // Now animate to the final frame.
        if (self.isPresenting) {

            toViewController.view.frame = onscreenFrame;
        }
        else {

            toViewController.view.frame = offscreenFrame;
        }


    } completion:^(BOOL finished) {

        [transitionContext completeTransition:YES];
    }];


}

@end

#导入“SecondViewController.h”
#导入“SecondPresentationController.h”
@接口SecondViewController（）
@属性（非原子，getter=isPresenting）布尔呈现；
@结束
@第二视图控制器的实现
#pragma标记-初始化
-（instancetype）initWithNibName:（NSString*）nibNameOrNil bundle:（NSBundle*）nibBundleOrNil{
self=[super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]；
如果（自我）{
self.transitioningDelegate=self；
self.modalPresentationStyle=UIModalPresentationCustom；
self.view.layer.cornerRadius=5.0f；
self.view.clipstobunds=是；
}
回归自我；
}
#pragma标记-内容大小
-（CGSize）首选内容大小{
返回CGSizeMake（266.0f，143.0f）；//我用于此示例代码的测试图像的静态大小。
}
#pragma标记-UIViewControllerTransitioningDelegate
-（NSTimeInterval）transitionDuration：（id）transitionContext{
返回1.0；
}
-（id）animationControllerForPresentedController:（UIViewController*）PresentedPresentingController:（UIViewController*）PresentingSourceController:（UIViewController*）源{
self.presenting=YES；///用于动画转换
回归自我；
}
-（id）animationControllerForDismissedController:（UIViewController*）已解除{
self.presenting=NO；///用于动画转换
回归自我；
}
-（UIPresentationController*）PresentationController for PresentedViewController:（UIViewController*）PresentedViewController:（UIViewController*）PresentedViewController:（UIViewController*）PresentedSourceViewController:（UIViewController*）源{
return[[Second PresentationController alloc]initWithPresentedViewController:self-presentingViewController:self.presentingViewController]；
}
#pragma标记-UIViewControlleranimated转换
-（void）animateTransfion:（id）transitionContext{
UIViewController*fromViewController=[transitionContext ViewControllerWorky:UITransitionContextFromViewControllerKey]；
UIViewController*toViewController=[transitionContext ViewControllerWorky:UITransitionContextToViewControllerKey]；
[[transitionContext containerView]添加子视图：toViewController.view]；
CGSize preferredSize=toViewController.preferredContentSize；
//屏幕上的画面将位于superview的中心，而屏幕外的画面将位于superview的正下方（并完全脱离屏幕）
CGRect onscreenFrame=CGRectMake（（fromViewController.view.bounds.size.width-preferredSize.width）*0.5f，（fromViewController.view.bounds.size.height-preferredSize.height）*0.5f，
preferredSize.width、preferredSize.height）；
CGRect offscreenFrame=在CREENFRAME上；
offscreenFrame.origin.y=fromViewController.view.bounds.size.height；
//设置viewController的*初始*帧。
如果（自我呈现）{
toViewController.view.frame=Offscreen帧；
}
否则{
toViewController.view.frame=onscreenFrame；
}
[ui查看动画时长：0.5延迟：0.0使用带阻尼的弹簧：0.8f初始弹簧速度：0.8f选项：针织动画：^{
//现在设置动画到最后一帧。
如果（自我呈现）{
toViewController.view.frame=onscreenFrame；
}
否则{
toViewController.view.frame=Offscreen帧；
}
}完成：^（布尔完成）{
[transitionContext completeTransition:是]；
}];
}
@结束

第二个PresentationController处理curtainview：

#import "SecondPresentationController.h"

@interface SecondPresentationController ()

@property (nonatomic, readonly) UIView *curtainView;

@end


@implementation SecondPresentationController

- (instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController {

    self = [super initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController];

    if (self) {

        _curtainView = [UIView new];
        self.curtainView.backgroundColor = [UIColor colorWithWhite:0.0f alpha:0.6f];
        self.curtainView.alpha = 0.0f;

    }

    return self;
}

- (void)presentationTransitionWillBegin {

    UIView *containerView = self.containerView;

    self.curtainView.frame = containerView.bounds;

    self.curtainView.alpha = 0.0f;

    [containerView insertSubview:self.curtainView atIndex:0];

    [self.presentedViewController.transitionCoordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {

        self.curtainView.alpha = 1.0f;
    } completion:nil];
}


@end

#导入“SecondPresentationController.h”
@接口SecondPresentationController（）
@属性（非原子，只读）UIView*curtainView；
@结束
@第二个表示控制器的实现
-（instancetype）initWithPresentedViewController:（UIViewController*）presentedViewController presentingViewController:（UIViewController*）presentingViewController presentingViewController{
self=[super initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController]；
如果（自我）{
_curtainView=[UIView新建]；
self.curtainView.backgroundColor=[UIColor-WithWhite:0.0f alpha:0.6f]；
self.curtainView.alpha=0.0f；
}
回归自我；
}
-（无效）表示转换将开始{
UIView*containerView=self.containerView；
self.curtainView.frame=containerView.bounds；
self.curtainView.alpha=0.0f；
[containerView insertSubview:self.curtainView索引：0]；
[self.presentedViewController.transitionCoordinator AnimateLongsideTransition:^（id_非空上下文）{
自己