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UIBarButtonItem
if(!([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curX
if ((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curX
if (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 code
CGSize 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) { }];
}