AJ学IOS 之ipad开发Popover的基本使用

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一：效果图

二：注意

对于方法[UIPopoverController dealloc] reached while popover is still visible.

当popover还在显示的时候,它就挂了

不允许popover还在显示的时候挂掉

popover必须在消失的时候挂掉

三：核心代码

[code]- (IBAction)popMenu:(id)item {
    // 0.内容
    MenuViewController *menu = [[MenuViewController alloc] init];

    // 1.创建一个UIPopover
    UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:[[UINavigationController alloc] initWithRootViewController:menu]];

    // 2.设置尺寸
//    popover.popoverContentSize = CGSizeMake(320, 44 * 5);

    // 3.从哪里显示出来 --> 指向item
    [popover presentPopoverFromBarButtonItem:item permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

    self.popover = popover;
}

四：全部代码展示

ViewController

[code]#import "ViewController.h"
#import "MenuViewController.h"

@interface ViewController ()
- (IBAction)popMenu:(id)item;
@property (nonatomic, strong) UIPopoverController *popover;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

}

// -[UIPopoverController dealloc] reached while popover is still visible.
// 当popover还在显示的时候,它就挂了
// 不允许popover还在显示的时候挂掉
// popover必须在消失的时候挂掉

/**
 *  弹出Popover菜单
 */
- (IBAction)popMenu:(id)item {
    // 0.内容
    MenuViewController *menu = [[MenuViewController alloc] init];

    // 1.创建一个UIPopover
    UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:[[UINavigationController alloc] initWithRootViewController:menu]];

    // 2.设置尺寸
//    popover.popoverContentSize = CGSizeMake(320, 44 * 5);

    // 3.从哪里显示出来 --> 指向item
    [popover presentPopoverFromBarButtonItem:item permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

    self.popover = popover;
}
@end

MenuViewController

[code]#import "MenuViewController.h"

@interface MenuViewController ()
@property (nonatomic, strong) NSArray *titles;
@end

@implementation MenuViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.titles = @[@"设置", @"清除缓存", @"退出", @"基本信息"];
    self.title = @"菜单";
    self.view.backgroundColor = [UIColor blueColor];

    CGFloat w = 320;
    CGFloat h = self.titles.count * 44;
    self.preferredContentSize = CGSizeMake(w, h);
//    self.contentSizeForViewInPopover = CGSizeMake(w, h);
}

#pragma mark - Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.titles.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *ID = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
    }

    cell.textLabel.text = self.titles[indexPath.row];

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UIViewController *vc = [[UIViewController alloc] init];
    vc.view.backgroundColor = [UIColor redColor];
    [self.navigationController pushViewController:vc animated:YES];
}

@end