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
/**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
/*
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)idanimationDelegate;
/**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
/**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 ()
/**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