谷歌现在喜欢iOS上的界面

所以，我绝对喜欢Android上Google Now的卡片界面。。最近它甚至出现在iOS上

是否有任何教程或示例项目可以帮助我为iOS应用程序创建卡片界面

根据我的研究，我已经能够使用自定义UICollectionViewFlowLayout在某种程度上复制“堆叠”卡片

- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
{
    NSArray *allAttributesInRect = [super layoutAttributesForElementsInRect:rect];

    CGPoint centerPoint = CGPointMake(CGRectGetMidX(self.collectionView.bounds), CGRectGetMidY(self.collectionView.bounds));

    for (UICollectionViewLayoutAttributes *cellAttributes in allAttributesInRect)
    {
        if (CGRectContainsPoint(cellAttributes.frame, centerPoint))
        {
            cellAttributes.transform = CGAffineTransformIdentity;
            cellAttributes.zIndex = 1.0;
        }
        else
        {
            cellAttributes.transform = CGAffineTransformMakeScale(0.75, 0.75);
        }
    }

    return allAttributesInRect;
}

然后我将最小行距设置为负值，使它们看起来“堆叠”

---

在滚动时，我希望卡片保持在底部，只有一辆车可以放大并在屏幕上居中显示。然后我会把那张卡从屏幕上滚下来，然后从堆栈中的下一张“卡”会从堆栈中向上滚动，并在屏幕上居中。我猜这将是动态调整最小行距？

我认为没有任何教程或课程能完全满足您的要求。但是，如果您不介意只针对iOS6及更高版本，您可以使用

UICollectionView

。使用标准的垂直流布局，要实现您想要实现的目标应该不会那么困难。看看：

• WWDC 2012年会议205

我知道这些例子看起来和你想要实现的并不完全一样。但是，一旦您掌握了使用这些站点的

UICollectionView

的基本概念，您将能够立即构建卡片布局

更新 我创建了一个快速示例来展示一种处理单元格平移的潜在方法。确保添加必要的代码以从集合视图中删除项目，该视图位于

//插入代码以删除此处的单元格

，然后它将填补您通过删除单元格而创建的空白

CLCollectionViewCell.h

#import <QuartzCore/QuartzCore.h>
#import <UIKit/UIKit.h>

@interface CLCollectionViewCell : UICollectionViewCell <UIGestureRecognizerDelegate>

@property (assign, setter = setDeleted:) BOOL isDeleted;
@property (strong) UIPanGestureRecognizer *panGestureRecognizer;

@end

#导入
#进口
@接口CLCollectionViewCell:UICollectionViewCell
@属性（assign，setter=setDeleted:）BOOL被删除；
@属性（强）UIPangestureRecognitor*PangestureRecognitor；
@结束

CLCollectionViewCell.m

#import "CLCollectionViewCell.h"

@implementation CLCollectionViewCell

- (id)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        // Create a pan gesture recognizer with self set as the delegate and add it the cell
        _panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureRecognizerDidChange:)];
        [_panGestureRecognizer setDelegate:self]; 
        [self addGestureRecognizer:_panGestureRecognizer];
        
        // Don't clip to bounds since we want the content view to be visible outside the bounds of the cell
        [self setClipsToBounds:NO];
        
        // For debugging purposes only: set the color of the content view
        [[self contentView] setBackgroundColor:[UIColor greenColor]];
    }
    return self;
}

- (void)panGestureRecognizerDidChange:(UIPanGestureRecognizer *)panGestureRecognizer {
    if ([self isDeleted]) {
        // The cell should be deleted, leave the state of the cell as it is 
        return;
    }
    
    // Percent holds a float value between -1 and 1 that indicates how much the user moved his finger relative to the width of the cell
    CGFloat percent = [panGestureRecognizer translationInView:self].x / [self frame].size.width;
    
    switch ([panGestureRecognizer state]) {
        case UIGestureRecognizerStateChanged: {
            // Create the 'throw animation' and base its current state on the percent
            CGAffineTransform moveTransform = CGAffineTransformMakeTranslation(percent * [self frame].size.width, 0.f);
            CGAffineTransform rotateTransform = CGAffineTransformMakeRotation(percent * M_PI / 20.f);
            CGAffineTransform transform = CGAffineTransformConcat(moveTransform, rotateTransform) ;
            
            // Apply the transformation to the content view
            [[self contentView] setTransform:transform];
            
            break;
        }
            
        case UIGestureRecognizerStateFailed:
        case UIGestureRecognizerStateEnded:
        case UIGestureRecognizerStateCancelled: {
            // Delete the current cell if the absolute value of the percent is above O.7 or the absolute value of the velocity of the gesture is above 600
            if (fabsf(percent) > 0.7f || fabsf([panGestureRecognizer velocityInView:self].x) > 600.f) {
                // The direction is -1 if the gesture is going left and 1 if it's going right
                CGFloat direction = percent < 0.f ? -1.f : 1.f;
                // Multiply the direction to make sure the content view will be removed entirely from the screen
                direction *= 1.5f;
                
                // Create the transform based on the direction of the gesture
                CGAffineTransform moveTransform = CGAffineTransformMakeTranslation(direction * [self frame].size.width , 0.f);
                CGAffineTransform rotateTransform = CGAffineTransformMakeRotation(direction * M_PI / 20.f);
                CGAffineTransform transform = CGAffineTransformConcat(moveTransform, rotateTransform);
                
                // Calculate the duration of the animation based on the velocity of the pan gesture recognizer and normalize abnormal high and low values
                CGFloat duration = fabsf(1000.f / [panGestureRecognizer velocityInView:self].x);
                duration = duration > 2.f  ? duration = 2.f  : duration;
                duration = duration < 0.2f ? duration = 0.2f : duration;
                
                // Animate the 'throwing away' of the cell and update the collection view once it's completed
                [UIView animateWithDuration:duration
                                 animations:^(){
                                     [[self contentView] setTransform:transform];
                                }
                                 completion:^(BOOL finished){
                                     [self setDeleted:YES];
                                     
                                     // Insert code to delete the cell here
                                     // e.g. [collectionView deleteItemsAtIndexPaths:@[[collectionView indexPathForCell:self]]];
                }];
                
            } else {
                // The cell shouldn't be deleted: animate the content view back to its original position
                [UIView animateWithDuration:1.f animations:^(){
                    [[self contentView] setTransform:CGAffineTransformIdentity];
                }];
            }
            
            break;
        }
            
        default: {
            break;
        }
    }
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    // Return YES to make sure the pan gesture recognizer doesn't interfere with the gesture recognizer of the collection view
    return YES;
}

@end

#导入“CLCollectionViewCell.h”
@实现CLCollectionViewCell
-（id）initWithCoder:（NSCoder*）aDecoder{
if（self=[super initWithCoder:aDecoder]）{
//创建一个以self set作为代理的平移手势识别器，并将其添加到单元格中
_panGestureRecognizer=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector（panGestureRecognizerDidChange:）]；
[\u PangestureRecognitor setDelegate:self]；
[自添加GestureRecognitor:_PangestureRecognitor]；
//不要剪裁到边界，因为我们希望内容视图在单元格边界之外可见
[自设置ClipsToBounds:否]；
//仅用于调试目的：设置内容视图的颜色
[[self-contentView]setBackgroundColor:[UIColor-greenColor]]；
}
回归自我；
}
-（void）PangESTURE识别器DIDCHANGE:（UIPangESTURE识别器*）PangESTURE识别器{
如果（[自删除]）{
//应删除单元格，保持单元格的状态不变
返回；
}
//百分比包含一个介于-1和1之间的浮点值，该值指示用户相对于单元格宽度移动手指的程度
CGFloat百分比=[PangestureRecognitor TranslationView:self].x/[self frame].size.width；
开关（[PangestureRecognitor状态]）{
案例UIgestureRecognitzerStateChanged:{
//创建“抛出动画”并根据百分比确定其当前状态
CGAffineTransform moveTransform=CGAffineTransformMakeTransform（百分比*[self frame].size.width，0.f）；
CGAffineTransform rotateTransform=CGAffineTransformMakeRotation（百分比*M_PI/20.f）；
CGAffineTransform transform=CGAffineTransformConcat（移动变换，旋转变换）；
//将转换应用于内容视图
[[self-contentView]设置转换：转换]；
打破
}
案例UIgestureRecognitzerStateFailed：
案例UIgestureRecognitzerStateEnded：
案例UIgestureRecognitizerState已取消：{
//如果百分比的绝对值大于0.7或手势速度的绝对值大于600，则删除当前单元格
如果（fabsf（百分比）>0.7f | | fabsf（[PangestureRecognitor VelocityView:self].x）>600.f）{
//如果手势向左，方向为-1，如果手势向右，方向为1
CGFloat方向=百分比<0.f？-1.f:1.f；
//乘以方向以确保内容视图将完全从屏幕上删除
方向*=1.5f；
//基于手势的方向创建变换
CGAffineTransform moveTransform=CGAffineTransformMakeTransform（方向*[自帧]）.size.width，0.f）；
CGAffineTransform rotateTransform=CGAffineTransformMakeRotation（方向*M_PI/20.f）；
CGAffineTransform transform=CGAffineTransformConcat（移动变换，旋转变换）；
//根据平移手势识别器的速度计算动画的持续时间，并对异常的高值和低值进行规格化
CGFloat duration=fabsf（1000.f/[pangestureinrecognizer-velocityview:self].x）；
持续时间=持续时间>2.f？持续时间=2.f：持续时间；
持续时间=持续时间<0.2f？持续时间=0.2f：持续时间；
//设置单元格“丢弃”的动画，并在完成后更新集合视图
[UIView animateWithDuration:持续时间
动画：^（）{
[[self-contentView]设置转换：转换]；
}
完成：^（布尔完成）{