一个实用的TableView滑动效果

作者: honzon_0 | 来源:发表于2020-10-24 14:38 被阅读0次

首先看效果

QQ20201024-140424-HD的副本.gif

关键点

自定义手势

很明显的需要一个自定义拖动手势

//拖拽手势
    UIPanGestureRecognizer *tableViewPan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureAction:)];
    tableViewPan.delegate = self;
    self.animationPanGes = tableViewPan;
    [self addGestureRecognizer:tableViewPan];

跟随拖拽手势移动视图

这里移动视图并不一定要是tableView,虽然拖拽手势是添加在tableView上面,但是可以设置为tableView的父视图，具体自行实践

@protocol MTVerticalAnimationTableViewDelegate <NSObject>
/**跟随拖动手势移动的View*/
- (UIView *)mt_verticalAnimationTableViewPanGestureMovingView:(MTVerticalAnimationTableView *)tableView;
@end

这里通过代理来控制移动的视图

处理自定义拖动手势与tableView的拖动手势冲突

设置tableView的拖动手势在自定义拖动手势失效之后生效

//tableView滚动手势依赖于自定义手势失败
[self.panGestureRecognizer requireGestureRecognizerToFail:tableViewPan];

手势代理设置自定义手势失效条件

//列表滚动  只响应tableView拖动手势
if (self.contentOffset.y > 0) {
    return NO;
}

//contentOffset.y = 0时  1.向上拖动，tableView拖动手势响应  2.向下拖动，自定义拖动手势响应
if (self.contentOffset.y == 0 && translatedPoint.y < 0) {
    return NO;
}

设置自定义手势生效时的操作

/**拖动手势中*/
CGRect frame = movingView.frame;
frame.origin.y += translation.y;
//改变frame
movingView.frame = frame

设置自定义手势结束时的操作

/**拖动手势结束*/
CGRect frame = movingView.frame;
frame.origin.y += translation.y;

 //确定最终Y
    MTAnimationTableViewState state = MTAnimationTableViewStateBottom;
    if (frame.origin.y > self.centerStateOriginY && frame.origin.y <= self.bottomStateOriginY) {
        frame.origin.y = self.bottomStateOriginY;
    } else {
        if (self.state == MTAnimationTableViewStateTop && frame.origin.y > self.topStateOriginY) {
            frame.origin.y = self.centerStateOriginY;
            state = MTAnimationTableViewStateCenter;
        } else {
            frame.origin.y = self.topStateOriginY;
            state = MTAnimationTableViewStateTop;
        }
    }

//改变frame
movingView.frame = frame

所有代码

`MTVerticalAnimationTableView.h`文件

#import <UIKit/UIKit.h>

/*
 MTAnimationTableViewStateTop
 1.列表向上滑动 正常滑动
 2.列表向下滑动 a.没有滑动到顶部，正常滑动  b.滑动到顶部，整体向下
 
 MTAnimationTableViewStateCenter
    1.列表向上滑动 禁止滑动 整体向上
    2.列表向下滑动 禁止滑动 整体向下
 
 MTAnimationTableViewStateBottom
 */
typedef enum : NSUInteger {
    MTAnimationTableViewStateTop,
    MTAnimationTableViewStateCenter,
    MTAnimationTableViewStateBottom,
} MTAnimationTableViewState;

@protocol MTVerticalAnimationTableViewDelegate;

@interface MTVerticalAnimationTableView : UITableView
@property (nonatomic, weak)id<MTVerticalAnimationTableViewDelegate>animationDelegate;
/**位置枚举*/
@property (nonatomic, assign, readonly)MTAnimationTableViewState state;

/**Top PanGestureMovingView的frame.origin.y   默认 = (安全区域高度+导航栏高度)*/
@property (nonatomic, assign)CGFloat topStateOriginY;
/**Center PanGestureMovingView的frame.origin.y  默认 = (安全区域高度+导航栏高度-topStateOriginY)/2*/
@property (nonatomic, assign)CGFloat centerStateOriginY;
/**Bottom PanGestureMovingView的frame.origin.y  默认 = (屏幕高度)*/
@property (nonatomic, assign)CGFloat bottomStateOriginY;

/**创建*/
- (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style state:(MTAnimationTableViewState)state;

/**显示*/
- (void)showAnimationTableViewCompletion:(dispatch_block_t)completion;

/**隐藏*/
- (void)hiddenAnimationTableViewCompletion:(dispatch_block_t)completion;
@end


@protocol MTVerticalAnimationTableViewDelegate <NSObject>
/**跟随拖动手势移动的View*/
- (UIView *)mt_verticalAnimationTableViewPanGestureMovingView:(MTVerticalAnimationTableView *)tableView;

@optional
/**拖动手势移动的View动画结束*/
- (void)mt_verticalAnimationTableViewPanGestureEnded:(MTVerticalAnimationTableView *)tableView;
@end

`MTVerticalAnimationTableView.m`文件

#import "MTVerticalAnimationTableView.h"

@interface MTVerticalAnimationTableView ()<UIGestureRecognizerDelegate>
/**拖动手势*/
@property (nonatomic, strong)UIPanGestureRecognizer *animationPanGes;

/**位置枚举*/
@property (nonatomic, assign, readwrite)MTAnimationTableViewState state;
@end

@implementation MTVerticalAnimationTableView
- (void)dealloc{
    NSLog(@"MTAnimationTableView dealloc");
}

#pragma mark - Public
- (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style state:(MTAnimationTableViewState)state{
    self = [super initWithFrame:frame style:style];
    if (self) {
        self.state = state;
        //设置默认限制
        [self setupAnimationTableViewStateOriginY];
        //设置头部
        [self setupSubViews:style];
    }
    return self;
}

/**显示*/
- (void)showAnimationTableViewCompletion:(dispatch_block_t)completion {
    /**已经弹出不做处理*/
    if (self.state != MTAnimationTableViewStateBottom) {
        if (completion) {
            completion();
        }
        return;
    }
    
    if ([self.animationDelegate respondsToSelector:@selector(mt_verticalAnimationTableViewPanGestureMovingView:)]) {
        CGRect frame = [self _panGestureMovingViewFrame];
        frame.origin.y = self.centerStateOriginY;
        [self _animationFrame:frame changeState:MTAnimationTableViewStateCenter completion:completion];
    }
}

/**隐藏*/
- (void)hiddenAnimationTableViewCompletion:(dispatch_block_t)completion {
    CGRect frame = [self _panGestureMovingViewFrame];
    frame.origin.y = self.bottomStateOriginY;
    [self _animationFrame:frame changeState:MTAnimationTableViewStateBottom completion:completion];
}

#pragma mark - UI
/**设置默认限制*/
- (void)setupAnimationTableViewStateOriginY {
    CGFloat ret = 64;
    if (@available(iOS 11.0,*)) {
        CGFloat navBarHeight = 44.0f;
        ret = [UIApplication sharedApplication].statusBarFrame.size.height + navBarHeight;

    }
    self.topStateOriginY = ret;
    self.centerStateOriginY = ([UIScreen mainScreen].bounds.size.height+ret)/2;
    self.bottomStateOriginY = [UIScreen mainScreen].bounds.size.height;
}

- (void)setupSubViews:(UITableViewStyle)style {
    //拖拽手势
    UIPanGestureRecognizer *tableViewPan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureAction:)];
    tableViewPan.delegate = self;
    self.animationPanGes = tableViewPan;
    [self addGestureRecognizer:tableViewPan];
    
    //tableView滚动手势依赖于自定义手势失败
    [self.panGestureRecognizer requireGestureRecognizerToFail:tableViewPan];
}

#pragma mark - Action
/**拖动手势*/
- (void)panGestureAction:(UIPanGestureRecognizer *)panGes {
    CGPoint translation = [panGes translationInView:panGes.view];
    //拖动一直是在递增，所以每次都要用setTranslation:inView:方法置为0
    [panGes setTranslation:CGPointMake(0, 0) inView:panGes.view];
    
    if(panGes.state ==UIGestureRecognizerStateBegan) {
        
    } else if(panGes.state ==UIGestureRecognizerStateChanged) {
        [self panGestureRecognizerChanging:translation];
    } else if(panGes.state ==UIGestureRecognizerStateEnded) {
        [self panGestureRecognizerDidChange:translation];
    }
}

/**拖动手势中*/
- (void)panGestureRecognizerChanging:(CGPoint)translation {
    CGRect frame = [self _panGestureMovingViewFrame];
    frame.origin.y += translation.y;
    
    //不小于最小Y
    if ([self _compareCGfloat:frame.origin.y CGFloat2:self.topStateOriginY] == NSOrderedAscending) {
        frame.origin.y = self.topStateOriginY;
    }
    //不大于最大Y
    if ([self _compareCGfloat:frame.origin.y CGFloat2:self.bottomStateOriginY] == NSOrderedDescending) {
        frame.origin.y = self.bottomStateOriginY;
    }

    //改变frame
    if ([self.animationDelegate respondsToSelector:@selector(mt_verticalAnimationTableViewPanGestureMovingView:)]) {
        [self.animationDelegate mt_verticalAnimationTableViewPanGestureMovingView:self].frame = frame;
    }
}

/**拖动手势结束*/
- (void)panGestureRecognizerDidChange:(CGPoint)translation {
    CGRect frame = [self _panGestureMovingViewFrame];
    frame.origin.y += translation.y;
    //不小于最小Y
    if ([self _compareCGfloat:frame.origin.y CGFloat2:self.topStateOriginY] == NSOrderedAscending) {
        frame.origin.y = self.topStateOriginY;
    }
    //不大于最大Y
    if ([self _compareCGfloat:frame.origin.y CGFloat2:self.bottomStateOriginY] == NSOrderedDescending) {
        frame.origin.y = self.bottomStateOriginY;
    }
    
    //    //确定最终Y
    //    MTAnimationTableViewState state = MTAnimationTableViewStateBottom;
    //    if (frame.origin.y < self.centerStateOriginY) {
    //        frame.origin.y = self.topStateOriginY;
    //        state = MTAnimationTableViewStateTop;
    //    } else if(frame.origin.y >= self.centerStateOriginY && frame.origin.y < (self.bottomStateOriginY+self.centerStateOriginY)/2) {
    //        frame.origin.y = self.centerStateOriginY;
    //        state = MTAnimationTableViewStateCenter;
    //    } else {
    //        frame.origin.y = self.bottomStateOriginY;
    //    }
    
    //确定最终Y
    MTAnimationTableViewState state = MTAnimationTableViewStateBottom;
    if ([self _compareCGfloat:frame.origin.y CGFloat2:self.centerStateOriginY] == NSOrderedDescending && [self _compareCGfloat:frame.origin.y CGFloat2:self.bottomStateOriginY] != NSOrderedDescending) {
        frame.origin.y = self.bottomStateOriginY;
    } else {
        if (self.state == MTAnimationTableViewStateTop && [self _compareCGfloat:frame.origin.y CGFloat2:self.topStateOriginY] == NSOrderedDescending) {
            frame.origin.y = self.centerStateOriginY;
            state = MTAnimationTableViewStateCenter;
        } else {
            frame.origin.y = self.topStateOriginY;
            state = MTAnimationTableViewStateTop;
        }
    }
    
    //动画
    [self _animationFrame:frame changeState:state completion:^{
        //动画结束
        if ([self.animationDelegate respondsToSelector:@selector(mt_verticalAnimationTableViewPanGestureEnded:)]) {
            [self.animationDelegate mt_verticalAnimationTableViewPanGestureEnded:self];
        }
    }];
}

#pragma mark - Private
- (void)_animationFrame:(CGRect)frame changeState:(MTAnimationTableViewState)changeState completion:(dispatch_block_t)completion{
    [UIView animateWithDuration:0.3 animations:^{
        //改变frame
        if ([self.animationDelegate respondsToSelector:@selector(mt_verticalAnimationTableViewPanGestureMovingView:)]) {
            [self.animationDelegate mt_verticalAnimationTableViewPanGestureMovingView:self].frame = frame;
        }
    } completion:^(BOOL finished) {
        if (finished) {
            self.state = changeState;
        
            if (completion) {
                completion();
            }
        }
    }];
}

- (CGRect)_panGestureMovingViewFrame {
    if ([self.animationDelegate respondsToSelector:@selector(mt_verticalAnimationTableViewPanGestureMovingView:)]) {
        UIView *moveingView = [self.animationDelegate mt_verticalAnimationTableViewPanGestureMovingView:self];
        return moveingView.frame;
    }
    return CGRectZero;
}

/**CGFloat比较方法  解决精度丢失问题*/
- (NSComparisonResult)_compareCGfloat:(CGFloat)float1 CGFloat2:(CGFloat)float2 {
    /**精度差值  决定是否相等*/
    float positiveDifference = 0.001;
    float negativeDifference = -0.001;
    CGFloat result = float1 - float2;
    if (result < negativeDifference) {
        return NSOrderedAscending;
    } else if(result > positiveDifference) {
        return NSOrderedDescending;
    } else {
        return NSOrderedSame;
    }
}

#pragma mark - UIGestureRecognizerDelegate
/**处理自定义手势生效失效*/
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
    if (gestureRecognizer == self.animationPanGes && self.state == MTAnimationTableViewStateTop) {
        CGPoint translatedPoint = [self.animationPanGes translationInView:self.animationPanGes.view];
        
        //列表滚动  只响应tableView拖动手势
        if (self.contentOffset.y > 0) {
            return NO;
        }
        
        //contentOffset.y = 0时  1.向上拖动，tableView拖动手势响应  2.向下拖动，自定义拖动手势响应
        if (self.contentOffset.y == 0 && translatedPoint.y < 0) {
            return NO;
        }
    }

    return YES;
}

- (void)setTopStateOriginY:(CGFloat)topStateOriginY {
    _topStateOriginY = ceil(topStateOriginY);
}

@end

一个实用的TableView滑动效果

首先看效果

关键点

自定义手势

跟随拖拽手势移动视图

处理自定义拖动手势与tableView的拖动手势冲突

所有代码

`MTVerticalAnimationTableView.h`文件

`MTVerticalAnimationTableView.m`文件

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热点阅读

iOS分享世界

一个实用的TableView滑动效果

首先看效果

关键点

自定义手势

跟随拖拽手势移动视图

处理自定义拖动手势与tableView的拖动手势冲突

所有代码

MTVerticalAnimationTableView.h文件

MTVerticalAnimationTableView.m文件

相关文章

网友评论

延伸阅读

深度阅读

栏目导航

热点阅读

iOS分享世界

`MTVerticalAnimationTableView.h`文件

`MTVerticalAnimationTableView.m`文件