ios – 模式转换样式,如邮件应用程序

我正在尝试实现模态呈现效果,其中所呈现的视图仅部分覆盖父视图,如下图所示.

我知道我可以通过使用UIPresentationController实现自定义转换来实现这一点.我不想重新发明,所以在我开始发展之前,我想问一下.

在API中是否有这种转型的支持？

我研究了所有可用的Modal Presentation Styles,在我看来,我不想支持我想要的转换,唯一的方法就是编写它.

解决方法

我遇到了同样的问题.我也去了模式演示风格的路线,并不断击中墙壁(具体让它在iPhone而不是iPad上工作).

经过一些挖掘,我能够得到它的工作.这是我如何做到的：

要开始,我们需要一个视图控制器,我们将呈现(模态的)将其视图的背景颜色设置为透明,并将导航控制器视图的框架设置为一些偏移.

ModalViewController.h

@import UIKit;
 
@class ModalViewController;
 
@protocol ModalViewControllerDelegate <NSObject>
 
- (void)modalViewControllerDidCancel:(ModalViewController *)modalViewController;
 
@end
 
@interface ModalViewController : UIViewController
@property (weak,nonatomic) id<ModalViewControllerDelegate> delegate;
 
- (instancetype)initWithRootViewController:(UIViewController *)rootViewController;
@end

ModalViewController.m

static const CGFloat kTopOffset = 50.0f;
 
@implementation ModalViewController {
    UINavigationController *_navController;
}
 
- (instancetype)initWithRootViewController:(UIViewController *)rootViewController
{
    self = [super initWithNibName:nil bundle:nil];
    if (self) {
        rootViewController.navigationItem.leftBarButtonItem = [self cancelButton];
        _navController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
        self.view.backgroundColor = [UIColor clearColor];
        [self.view addSubview:_navController.view];
 
        // this is important (prevents black overlay)
        self.modalPresentationStyle = UIModalPresentationOverFullScreen;
    }
 
    return self;
}
 
- (void)viewDidLoad
{
    [super viewDidLoad];
    CGRect bounds = self.view.bounds;
    _navController.view.frame = CGRectMake(0,kTopOffset,CGRectGetWidth(bounds),CGRectGetHeight(bounds) - kTopOffset);
}
 
- (UIBarButtonItem *)cancelButton
{
    return [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStylePlain target:self action:@selector(cancelButtonClicked:)];
}
 
- (void)cancelButtonClicked:(id)sender
{
    [_delegate modalViewControllerDidCancel:self];
}
 
@end

接下来,我们需要设置演示控制器来运行以下动画：

>缩小自己
淡出一点点
>使用presentViewController呈现模态视图控制器：动画：完成

这就是我所做的

PresentingViewController.m

static const CGFloat kTransitionScale = 0.9f;
static const CGFloat kTransitionAlpha = 0.6f;
static const NSTimeInterval kTransitionDuration = 0.5;
 
@interface PresentingViewController <ModalViewControllerDelegate>
@end
 
@implementation PresentingViewController
...
...
 
- (void)showModalViewController
{
    self.navigationController.view.layer.shouldRasterize = YES;
    self.navigationController.view.layer.rasterizationScale = [UIScreen mainScreen].scale;
 
    UIViewController *controller = // init some view controller
    ModalViewController *container = [[ModalViewController alloc] initWithRootViewController:controller];
    container.delegate = self;
 
    __weak UIViewController *weakSelf = self;
    [UIView animateWithDuration:kTransitionDuration animations:^{
        weakSelf.navigationController.view.transform = CGAffineTransformMakeScale(kTransitionScale,kTransitionScale);
        weakSelf.navigationController.view.alpha = kTransitionAlpha;
        [weakSelf presentViewController:container animated:YES completion:nil];
    } completion:^(BOOL finished) {
        weakSelf.navigationController.view.layer.shouldRasterize = NO;
    }];
}
 
#pragma mark - ModalViewControllerDelegate
 
- (void)modalViewControllerDidCancel:(ModalViewController *)modalViewController
{
    __weak UIViewController *weakSelf = self;
    [UIView animateWithDuration:kTransitionDuration animations:^{
        weakSelf.navigationController.view.alpha = 1;
        weakSelf.navigationController.view.transform = CGAffineTransformIdentity;
        [weakSelf dismissViewControllerAnimated:YES completion:nil];
    }];
}
@end

ios – 模式转换样式,如邮件应用程序

解决方法

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