UIPopoverPresentationController使

效果图.png

①新建一个继承自UIViewController的控制器：MSPopoverPresentationViewController

#import <UIKit/UIKit.h>

@interface MSPopoverPresentationViewController : UIViewController

// 弹出来的带箭头的视图的按钮title数组
@property (nonatomic, strong) NSMutableArray <NSString *> * dataArray;
// 通过sourceView来判断弹出来的带箭头的视图在什么位置
@property (nonatomic, strong) UIView *sourceView;
// 弹出来的带箭头的视图的背景颜色
@property (nonatomic, strong) UIColor *backgroundColor;
// 弹出来的带箭头的视图的按钮字体颜色
@property (nonatomic, strong) UIColor *textColor;
// 弹出来的带箭头的视图的箭头的方向
@property (nonatomic, assign) UIPopoverArrowDirection permittedArrowDirections;
// 弹出来的带箭头的视图的按钮点击事件
- (void)addClickBlock:(void (^) (NSInteger index))handle;

@end

#import "MSPopoverPresentationViewController.h"
#import <objc/runtime.h>

@interface MSPopoverPresentationViewController () <UITableViewDataSource, UITableViewDelegate, UIPopoverPresentationControllerDelegate>
@property (strong, nonatomic, nullable) UITableView *tableView;
@end

@implementation MSPopoverPresentationViewController

static NSString * cellIdentifier = @"POPCELL";
static char MSTableViewBlock;

- (instancetype)init {
    if (self = [super init]) {
        // 这两行代码先后顺序不能颠倒
        self.modalPresentationStyle = UIModalPresentationPopover;
        self.popoverPresentationController.delegate = self;
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.tableView = [[UITableView alloc] init];
    self.tableView.frame = CGRectMake(0, 0, self.preferredContentSize.width, self.preferredContentSize.height);
    self.tableView.separatorInset = UIEdgeInsetsZero;
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    self.tableView.scrollEnabled = NO;
    [self.view addSubview:self.tableView];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.dataArray.count;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return tableView.frame.size.height / self.dataArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:(UITableViewCellStyleDefault) reuseIdentifier:cellIdentifier];
    }
    cell.textLabel.text = self.dataArray[indexPath.row];
    if (self.textColor) cell.textLabel.textColor = self.textColor;
    if (self.backgroundColor) cell.backgroundColor = self.backgroundColor;
    cell.textLabel.textAlignment = NSTextAlignmentCenter;
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    [self dismissViewControllerAnimated:NO completion:nil];
    void (^ handle)(NSInteger) = objc_getAssociatedObject(self, &MSTableViewBlock);
    if (handle) {
        handle(indexPath.row);
    }
}

- (void)addClickBlock:(void (^)(NSInteger))handle {
    objc_setAssociatedObject(self, &MSTableViewBlock, handle, OBJC_ASSOCIATION_COPY_NONATOMIC);
}

- (void)setDataArray:(NSMutableArray *)dataArray {
    _dataArray = dataArray;
    [self.tableView reloadData];
}

- (void)setSourceView:(UIView *)sourceView {
    self.popoverPresentationController.sourceView = sourceView;
    self.popoverPresentationController.sourceRect = sourceView.bounds;
}

- (void)setPermittedArrowDirections:(UIPopoverArrowDirection)permittedArrowDirections {
    self.popoverPresentationController.permittedArrowDirections = permittedArrowDirections;
}

- (void)setBackgroundColor:(UIColor *)backgroundColor {
    _backgroundColor = backgroundColor;
    self.popoverPresentationController.backgroundColor = backgroundColor;
}

- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller {
    return UIModalPresentationNone;
}

@end

②使用MSPopoverPresentationViewController

#import "ViewController.h"
#import "MSPopoverPresentationViewController.h"

@interface ViewController ()

@property (nonatomic, strong) NSMutableArray *dataArray;

@end

@implementation ViewController

static CGFloat rowHeights = 50.0;

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    self.dataArray = [NSMutableArray arrayWithObjects:@"1245454", @"254fdsa", @"大范甘迪的", @"5tg4fd53", nil];
}

- (IBAction)buttonAction:(id)sender {
    MSPopoverPresentationViewController *ppVC = [MSPopoverPresentationViewController new];
    ppVC.dataArray = self.dataArray;
    ppVC.sourceView = sender;
    ppVC.textColor = [UIColor darkGrayColor];
    ppVC.permittedArrowDirections = UIPopoverArrowDirectionUp;
    ppVC.backgroundColor = [UIColor whiteColor];
    ppVC.preferredContentSize = CGSizeMake(100, rowHeights * self.dataArray.count);
    [self presentViewController:ppVC animated:NO completion:nil];
    __weak typeof(self) weakSelf = self;
    [ppVC addClickBlock:^(NSInteger index) {
        NSLog(@"%@", weakSelf.dataArray[index]);
    }];
}

@end

③注意事项：从效果图不难看出，文字过长会显示不全，这个需要配合ppVC.preferredContentSize = CGSizeMake(100, rowHeights * self.dataArray.count);使用，说明100的宽度不够，需要适当加宽。