改代码是参考一个Demo直接改的，代码中有一些漏洞，如果发现其他的问题，可以下方直接留言
.h文件
#import <UIKit/UIKit.h>
typedef void(^PopoverBlock)(NSInteger index);
@interface CustomPopView : UIView
//@property(nonatomic,copy)void(^block)(int index);
//-(void)setDataArr:(NSArray *)titleArr withView:(id *)view withBlock:(void(^)(NSString *a))block;
@property (nonatomic, copy) NSArray *menuTitles;
@property(nonatomic,copy)void(^PopoverHiddenBlock)(BOOL isHidden );
- (void)showFromView:(id)aView selected:(PopoverBlock)selected;
@end@interface PopoverArrow : UIView@end
.m文件
#import "CustomPopView.h"
// 字体大小
#define kPopoverFontSize 14.f// 十六进制颜色
#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]#define SCREEN_W [UIScreen mainScreen].bounds.size.width
#define SCREEN_H [UIScreen mainScreen].bounds.size.height// 箭头高度
#define kArrowH 8
// 箭头宽度
#define kArrowW 15
//每行的高度
#define CELL_HEIGHT 38
//
#define Identifier @"cell"// 边框颜色
#define kBorderColor UIColorFromRGB(0xE1E2E3)
@interface CustomPopView () <UITableViewDelegate, UITableViewDataSource>
{PopoverBlock _selectedBlock;UIView *_backgroundView;PopoverArrow *_arrowView;
}@property (nonatomic, retain) UITableView *tableView;@end@implementation CustomPopView
- (instancetype)initWithFrame:(CGRect)frame
{if (!(self = [super initWithFrame:frame])) return nil;self.backgroundColor = [UIColor clearColor];// 箭头_arrowView = [PopoverArrow new];[self addSubview:_arrowView];// tableView放在箭头底下, 用于箭头挡住tableView边框[self insertSubview:self.tableView belowSubview:_arrowView];return self;
}- (void)layoutSubviews
{[super layoutSubviews];// 设置tableView默认的分割线起终点位置if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {[self.tableView setSeparatorInset:UIEdgeInsetsZero];}if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {[self.tableView setLayoutMargins:UIEdgeInsetsZero];}self.tableView.layer.cornerRadius = 5.f;self.tableView.layer.borderColor = kBorderColor.CGColor;self.tableView.layer.borderWidth = 1.f;
}#pragma mark -- getter- (UITableView *)tableView
{if (_tableView) return _tableView;_tableView = [UITableView new];_tableView.delegate = self;_tableView.dataSource = self;_tableView.rowHeight = CELL_HEIGHT;_tableView.backgroundColor = [UIColor whiteColor];_tableView.showsVerticalScrollIndicator = NO;[_tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:Identifier];_tableView.tableFooterView = UIView.new;return _tableView;
}#pragma mark -- delegate- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{return self.menuTitles.count;
}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:Identifier];cell.textLabel.font = [UIFont systemFontOfSize:kPopoverFontSize];cell.textLabel.text = [self.menuTitles objectAtIndex:indexPath.row];return cell;
}- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {[cell setSeparatorInset:UIEdgeInsetsZero];}if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {[cell setLayoutMargins:UIEdgeInsetsZero];}
}- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{[UIView animateWithDuration:0.25 animations:^{self.alpha = 0;} completion:^(BOOL finished) {[_backgroundView removeFromSuperview];_backgroundView = nil;if (_selectedBlock) {_selectedBlock(indexPath.row);}[self removeFromSuperview];}];
}#pragma mark -- private
// 点击透明层隐藏
- (void)hide
{[UIView animateWithDuration:0.25 animations:^{self.alpha = 0;} completion:^(BOOL finished) {[_backgroundView removeFromSuperview];_backgroundView = nil;if(self.PopoverHiddenBlock){self.PopoverHiddenBlock(YES);}[self removeFromSuperview];}];
}#pragma mark -- public/*!* @author lifution** @brief 显示弹窗** @param aView 箭头指向的控件* @param selected 选择完成回调*/
- (void)showFromView:(id)aView selected:(PopoverBlock)selected
{if (selected) _selectedBlock = selected;//aView只能传两种参数，一种是UIView 另一种UIBarButtonItemif(!([aView isKindOfClass:[UIView class]] || [aView isKindOfClass:[UIBarButtonItem class]])){return;}UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;// 背景遮挡_backgroundView = UIView.new;_backgroundView.frame = keyWindow.bounds;_backgroundView.backgroundColor = [UIColor blackColor];_backgroundView.alpha = 0.2;_backgroundView.userInteractionEnabled = YES;[_backgroundView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hide)]];[keyWindow addSubview:_backgroundView];// 刷新数据更新contentSize[self.tableView reloadData];// 获取触发弹窗的按钮在window中的坐标CGRect triggerRect ;if([aView isKindOfClass:[UIView class]]){UIView *view = (UIView *)aView;triggerRect = [view convertRect:view.bounds toView:keyWindow];}else{UIView *bgView = [aView valueForKey:@"_view"];triggerRect = [bgView convertRect:bgView.bounds toView: keyWindow];}// 箭头指向的中心点CGFloat arrowCenterX = CGRectGetMaxX(triggerRect)-CGRectGetWidth(triggerRect)/2;// 取得标题中的最大宽度CGFloat maxWidth = 0;for (id obj in self.menuTitles) {if ([obj isKindOfClass:[NSString class]]) {CGSize titleSize = [obj sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:kPopoverFontSize]}];if (titleSize.width > maxWidth) {maxWidth = titleSize.width;}}}CGFloat curWidth = ((maxWidth+80)>SCREEN_W-30)?SCREEN_W-30:(maxWidth+80);CGFloat curHeight = CELL_HEIGHT*self.menuTitles.count+kArrowH;CGFloat curX = arrowCenterX-curWidth/2;CGFloat curY = CGRectGetMaxY(triggerRect)+10;// 如果箭头指向点距离屏幕右边减去5px不足curWidth的一半的话就重新设置curXif ((SCREEN_W-arrowCenterX-5)<curWidth/2) {curX = curX-(curWidth/2-(SCREEN_W-arrowCenterX-5));}// 如果箭头指向点距离屏幕左边加上5px不足curWidth的一半的话就重新设置curXif (arrowCenterX+5<curWidth/2) {curX = curX+(curWidth/2-arrowCenterX)+5;}//如果高度大于10行，则最高按10计算if(curHeight>CELL_HEIGHT*10+kArrowH){curHeight = CELL_HEIGHT*10+kArrowH;}self.frame = CGRectMake(curX, curY - 18, curWidth, curHeight);_arrowView.frame = CGRectMake(arrowCenterX-curX-kArrowW/2, 0, kArrowW, kArrowH+1);// 箭头高度 +1 遮挡住tableView的边框self.tableView.frame = CGRectMake(0, kArrowH, curWidth,curHeight - kArrowH );[keyWindow addSubview:self];self.alpha = 0;[UIView animateWithDuration:0.3 animations:^{self.alpha = 1;}];
}@end// 箭头
@implementation PopoverArrow- (instancetype)initWithFrame:(CGRect)frame
{if (!(self = [super initWithFrame:frame])) return nil;self.backgroundColor = [UIColor clearColor];return self;
}// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {[super drawRect:rect];// Drawing codeCGSize curSize = rect.size;CGContextRef context = UIGraphicsGetCurrentContext();CGContextSetLineWidth(context, 1);CGContextSetStrokeColorWithColor(context, kBorderColor.CGColor);CGContextSetFillColorWithColor(context, UIColor.whiteColor.CGColor);CGContextBeginPath(context);CGContextMoveToPoint(context, 0, curSize.height);CGContextAddLineToPoint(context, curSize.width/2, 0);CGContextAddLineToPoint(context, curSize.width, curSize.height);CGContextDrawPath(context, kCGPathFillStroke);
}@end
使用：
view = [CustomPopView new];
view.menuTitles = @[@"1",@"2",@"3"];
UIBarButtonItem *item = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addBtnClick:)];
self.navigationItem.rightBarButtonItem = item;-(void)addBtnClick:(UIBarButtonItem *)item{[view showFromView:item selected:^(NSInteger index) {}];
}
